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Convert.ToUInt16 Método

Definición

Convierte un valor especificado en un entero de 16 bits sin signo.

Sobrecargas

ToUInt16(String)

Convierte la representación de cadena especificada de un número en un entero de 16 bits sin signo equivalente.

ToUInt16(UInt16)

Devuelve el entero de 16 bits sin signo especificado; no se efectúa una conversión real.

ToUInt16(UInt32)

Convierte el valor del entero de 32 bits sin signo especificado en un entero de 16 bits sin signo equivalente.

ToUInt16(String, Int32)

Convierte la representación de cadena de un número en una base especificada en un entero de 16 bits sin signo equivalente.

ToUInt16(Object, IFormatProvider)

Convierte el valor del objeto especificado en un entero de 16 bits sin signo, usando la información de formato específica de la referencia cultural indicada.

ToUInt16(String, IFormatProvider)

Convierte la representación de cadena especificada de un número en un entero de 16 bits sin signo equivalente, usando la información de formato específica de la referencia cultural indicada.

ToUInt16(Single)

Convierte el valor del número de punto flotante de precisión sencilla especificado en un entero de 16 bits sin signo equivalente.

ToUInt16(UInt64)

Convierte el valor del entero de 64 bits sin signo especificado en un entero de 16 bits sin signo equivalente.

ToUInt16(SByte)

Convierte el valor del entero de 8 bits con signo especificado en un entero de 16 bits sin signo equivalente.

ToUInt16(Char)

Convierte el valor del carácter Unicode especificado en un entero de 16 bits sin signo equivalente.

ToUInt16(Int64)

Convierte el valor del entero de 64 bits con signo especificado en un entero de 16 bits sin signo equivalente.

ToUInt16(Int32)

Convierte el valor del entero de 32 bits con signo especificado en un entero de 16 bits sin signo equivalente.

ToUInt16(Int16)

Convierte el valor del entero de 16 bits con signo especificado en un entero de 16 bits sin signo equivalente.

ToUInt16(Decimal)

Convierte el valor del número decimal especificado en un entero de 16 bits sin signo equivalente.

ToUInt16(DateTime)

Cuando se llama a este método, siempre se produce InvalidCastException.

ToUInt16(Byte)

Convierte el valor del entero de 8 bits sin signo especificado en un entero de 16 bits sin signo equivalente.

ToUInt16(Boolean)

Convierte el valor booleano especificado en un entero de 16 bits sin signo equivalente.

ToUInt16(Object)

Convierte el valor del objeto especificado en un entero de 16 bits sin signo.

ToUInt16(Double)

Convierte el valor del número de punto flotante de precisión doble especificado en un entero de 16 bits sin signo equivalente.

ToUInt16(String)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Importante

Esta API no es conforme a CLS.

Convierte la representación de cadena especificada de un número en un entero de 16 bits sin signo equivalente.

public:
 static System::UInt16 ToUInt16(System::String ^ value);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (string value);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (string? value);
[<System.CLSCompliant(false)>]
static member ToUInt16 : string -> uint16
Public Shared Function ToUInt16 (value As String) As UShort

Parámetros

value
String

Cadena que contiene el número que se va a convertir.

Devoluciones

Un entero de 16 bits sin signo equivalente al número de value, o 0 (cero) si value es null.

Atributos

Excepciones

value no está formado por un signo opcional seguido de una secuencia de dígitos (de 0 a 9).

value representa un número menor que UInt16.MinValue o mayor que UInt16.MaxValue.

Ejemplos

En el ejemplo siguiente se intenta convertir cada elemento de una matriz de cadena numérica en un entero de 16 bits sin signo.

string[] values = { "1603", "1,603", "one", "1.6e03", "1.2e-02",
                    "-1326", "1074122" };
ushort result;

foreach (string value in values)
{
   try {
      result = Convert.ToUInt16(value);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        value.GetType().Name, value,
                        result.GetType().Name, result);
   }
   catch (FormatException) {
      Console.WriteLine("The {0} value {1} is not in a recognizable format.",
                        value.GetType().Name, value);
   }
   catch (OverflowException) {
      Console.WriteLine("{0} is outside the range of the UInt16 type.", value);
   }
}
// The example displays the following output:
//    Converted the String value '1603' to the UInt16 value 1603.
//    The String value 1,603 is not in a recognizable format.
//    The String value one is not in a recognizable format.
//    The String value 1.6e03 is not in a recognizable format.
//    The String value 1.2e-02 is not in a recognizable format.
//    -1326 is outside the range of the UInt16 type.
//    1074122 is outside the range of the UInt16 type.
let values =
    [| "1603"; "1,603"; "one"; "1.6e03"
       "1.2e-02"; "-1326"; "1074122" |]

for value in values do
    try
        let result = Convert.ToUInt16 value
        printfn $"Converted the {value.GetType().Name} value '{value}' to the {result.GetType().Name} value {result}."
    with
    | :? FormatException ->
        printfn $"The {value.GetType().Name} value {value} is not in a recognizable format."
    | :? OverflowException ->
        printfn $"{value} is outside the range of the UInt16 type." 
// The example displays the following output:
//    Converted the String value '1603' to the UInt16 value 1603.
//    The String value 1,603 is not in a recognizable format.
//    The String value one is not in a recognizable format.
//    The String value 1.6e03 is not in a recognizable format.
//    The String value 1.2e-02 is not in a recognizable format.
//    -1326 is outside the range of the UInt16 type.
//    1074122 is outside the range of the UInt16 type.
Dim values() As String = { "1603", "1,603", "one", "1.6e03", "1.2e-02", _
                           "-1326", "1074122" }
Dim result As UShort

For Each value As String In values
   Try
      result = Convert.ToUInt16(value)
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                        value.GetType().Name, value, _
                        result.GetType().Name, result)
   Catch e As FormatException
      Console.WriteLine("The {0} value {1} is not in a recognizable format.", _
                        value.GetType().Name, value)
   Catch e As OverflowException
      Console.WriteLine("{0} is outside the range of the UInt16 type.", value)
   End Try   
Next
' The example displays the following output:
'    Converted the String value '1603' to the UInt16 value 1603.
'    The String value 1,603 is not in a recognizable format.
'    The String value one is not in a recognizable format.
'    The String value 1.6e03 is not in a recognizable format.
'    The String value 1.2e-02 is not in a recognizable format.
'    -1326 is outside the range of the UInt16 type.
'    1074122 is outside the range of the UInt16 type.

Comentarios

El uso del ToUInt16(String) método equivale a pasar value al UInt16.Parse(String) método . value se interpreta mediante las convenciones de formato de la referencia cultural actual.

Si prefiere no controlar una excepción si se produce un error en la conversión, puede llamar al UInt16.TryParse método en su lugar. Devuelve un Boolean valor que indica si la conversión se realizó correctamente o no.

Se aplica a

ToUInt16(UInt16)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Importante

Esta API no es conforme a CLS.

Devuelve el entero de 16 bits sin signo especificado; no se efectúa una conversión real.

public:
 static System::UInt16 ToUInt16(System::UInt16 value);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (ushort value);
[<System.CLSCompliant(false)>]
static member ToUInt16 : uint16 -> uint16
Public Shared Function ToUInt16 (value As UShort) As UShort

Parámetros

value
UInt16

Entero de 16 bits sin signo que se va a devolver.

Devoluciones

value se devuelve sin cambios.

Atributos

Se aplica a

ToUInt16(UInt32)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Importante

Esta API no es conforme a CLS.

Convierte el valor del entero de 32 bits sin signo especificado en un entero de 16 bits sin signo equivalente.

public:
 static System::UInt16 ToUInt16(System::UInt32 value);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (uint value);
[<System.CLSCompliant(false)>]
static member ToUInt16 : uint32 -> uint16
Public Shared Function ToUInt16 (value As UInteger) As UShort

Parámetros

value
UInt32

Entero de 32 bits sin signo que se va a convertir.

Devoluciones

Un entero de 16 bits sin signo equivalente a value.

Atributos

Excepciones

value es mayor que UInt16.MaxValue.

Ejemplos

En el ejemplo siguiente se intenta convertir cada elemento en una matriz de enteros sin signo en un entero de 16 bits sin signo.

uint[] numbers = { UInt32.MinValue, 121, 340, UInt32.MaxValue };
ushort result;

foreach (uint number in numbers)
{
   try {
      result = Convert.ToUInt16(number);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the UInt16 type.",
                        number.GetType().Name, number);
   }
}
// The example displays the following output:
//    Converted the UInt32 value '0' to the UInt16 value 0.
//    Converted the UInt32 value '121' to the UInt16 value 121.
//    Converted the UInt32 value '340' to the UInt16 value 340.
//    The UInt32 value 4294967295 is outside the range of the UInt16 type.
let numbers = [| UInt32.MinValue; 121u; 340u; UInt32.MaxValue |]

for number in numbers do
    try
        let result = Convert.ToUInt16 number
        printfn $"Converted the {number.GetType().Name} value '{number}' to the {result.GetType().Name} value {result}."
    with :? OverflowException ->
        printfn $"The {number.GetType().Name} value {number} is outside the range of the UInt16 type."
                        
// The example displays the following output:
//    Converted the UInt32 value '0' to the UInt16 value 0.
//    Converted the UInt32 value '121' to the UInt16 value 121.
//    Converted the UInt32 value '340' to the UInt16 value 340.
//    The UInt32 value 4294967295 is outside the range of the UInt16 type.
Dim numbers() As UInteger = { UInt32.MinValue, 121, 340, UInt32.MaxValue }
Dim result As UShort
For Each number As UInteger In numbers
   Try
      result = Convert.ToUInt16(number)
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                        number.GetType().Name, number, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is outside the range of the UInt16 type.", _
                        number.GetType().Name, number)
   End Try
Next
' The example displays the following output:
'    Converted the UInt32 value '0' to the UInt16 value 0.
'    Converted the UInt32 value '121' to the UInt16 value 121.
'    Converted the UInt32 value '340' to the UInt16 value 340.
'    The UInt32 value 4294967295 is outside the range of the UInt16 type.

Se aplica a

ToUInt16(String, Int32)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Importante

Esta API no es conforme a CLS.

Convierte la representación de cadena de un número en una base especificada en un entero de 16 bits sin signo equivalente.

public:
 static System::UInt16 ToUInt16(System::String ^ value, int fromBase);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (string value, int fromBase);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (string? value, int fromBase);
[<System.CLSCompliant(false)>]
static member ToUInt16 : string * int -> uint16
Public Shared Function ToUInt16 (value As String, fromBase As Integer) As UShort

Parámetros

value
String

Cadena que contiene el número que se va a convertir.

fromBase
Int32

Base del número de value, que debe ser 2, 8, 10 o 16.

Devoluciones

Un entero de 16 bits sin signo equivalente al número de value, o 0 (cero) si value es null.

Atributos

Excepciones

fromBase no es 2, 8, 10 o 16.

O bien

value, que representa un número sin signo que no sea de base 10, tiene un signo negativo como prefijo.

value contiene un carácter que no es un dígito válido en la base especificada por fromBase. El mensaje de excepción indica que no hay dígitos para convertir si el primer carácter de value no es válido; en caso contrario, el mensaje indica que value contiene caracteres finales no válidos.

value, que representa un número sin signo que no sea de base 10, tiene un signo negativo como prefijo.

O bien

value representa un número menor que UInt16.MinValue o mayor que UInt16.MaxValue.

Ejemplos

En el ejemplo siguiente se intenta interpretar cada elemento de una matriz de cadenas numéricas como un valor hexadecimal y convertirlo en un entero de 16 bits sin signo.

using System;

public class Example
{
   public static void Main()
   {
      string[] hexStrings = { "8000", "0FFF", "f000", "00A30", "D", "-13",
                              "9AC61", "GAD" };
      foreach (string hexString in hexStrings)
      {
         try {
            ushort number = Convert.ToUInt16(hexString, 16);
            Console.WriteLine("Converted '{0}' to {1:N0}.", hexString, number);
         }
         catch (FormatException) {
            Console.WriteLine("'{0}' is not in the correct format for a hexadecimal number.",
                              hexString);
         }
         catch (OverflowException) {
            Console.WriteLine("'{0}' is outside the range of an Int16.", hexString);
         }
         catch (ArgumentException) {
            Console.WriteLine("'{0}' is invalid in base 16.", hexString);
         }
      }
   }
}
// The example displays the following output:
//    Converted '8000' to 32,768.
//    Converted '0FFF' to 4,095.
//    Converted 'f000' to 61,440.
//    Converted '00A30' to 2,608.
//    Converted 'D' to 13.
//    '-13' is invalid in base 16.
//    '9AC61' is outside the range of an Int16.
//    'GAD' is not in the correct format for a hexadecimal number.
open System

let hexStrings =
    [| "8000"; "0FFF"; "f000"; "00A30"
       "D"; "-13"; "9AC61"; "GAD" |]
for hexString in hexStrings do
    try
        let number = Convert.ToUInt16(hexString, 16)
        printfn $"Converted '{hexString}' to {number:N0}."
    with
    | :? FormatException ->
        printfn $"'{hexString}' is not in the correct format for a hexadecimal number."
    | :? OverflowException ->
        printfn $"'{hexString}' is outside the range of an Int16."
    | :? ArgumentException ->
        printfn $"'{hexString}' is invalid in base 16."
// The example displays the following output:
//    Converted '8000' to 32,768.
//    Converted '0FFF' to 4,095.
//    Converted 'f000' to 61,440.
//    Converted '00A30' to 2,608.
//    Converted 'D' to 13.
//    '-13' is invalid in base 16.
//    '9AC61' is outside the range of an Int16.
//    'GAD' is not in the correct format for a hexadecimal number.
Module Example
   Public Sub Main()
      Dim hexStrings() As String = { "8000", "0FFF", "f000", "00A30", "D", _
                                     "-13", "9AC61", "GAD" }
      For Each hexString As String In hexStrings
         Try
            Dim number As UShort = Convert.ToUInt16(hexString, 16)
            Console.WriteLine("Converted '{0}' to {1:N0}.", hexString, number)
         Catch e As FormatException
            Console.WriteLine("'{0}' is not in the correct format for a hexadecimal number.", _
                              hexString)
         Catch e As OverflowException
            Console.WriteLine("'{0}' is outside the range of an Int16.", hexString)
         Catch e As ArgumentException
            Console.WriteLine("'{0}' is invalid in base 16.", hexString)
         End Try
      Next                                            
   End Sub
End Module
'    ' The example displays the following output:
'    Converted '8000' to 32,768.
'    Converted '0FFF' to 4,095.
'    Converted 'f000' to 61,440.
'    Converted '00A30' to 2,608.
'    Converted 'D' to 13.
'    '-13' is invalid in base 16.
'    '9AC61' is outside the range of an Int16.
'    'GAD' is not in the correct format for a hexadecimal number.

Comentarios

Si fromBase es 16, puede prefijar el número especificado por el value parámetro con "0x" o "0X".

Dado que el UInt16 tipo de datos solo admite valores sin firmar, el ToUInt16(String, Int32) método supone que value se expresa mediante una representación binaria sin signo. En otras palabras, todos los 16 bits se usan para representar el valor numérico y un bit de signo no está presente. Como resultado, es posible escribir código en el que un valor entero con signo que está fuera del intervalo del tipo de UInt16 datos se convierte en un UInt16 valor sin que el método produzca una excepción. En el ejemplo siguiente se convierte Int16.MinValue en su representación de cadena hexadecimal y, a continuación, se llama al ToUInt16(String, Int32) método . En lugar de iniciar una excepción, el método muestra el mensaje "0x8000 convierte en 32768".

// Create a hexadecimal value out of range of the UInt16 type.
string value = Convert.ToString(Int16.MinValue, 16);
// Convert it back to a number.
try
{
   UInt16 number = Convert.ToUInt16(value, 16);
   Console.WriteLine("0x{0} converts to {1}.", value, number);
}
catch (OverflowException)
{
   Console.WriteLine("Unable to convert '0x{0}' to an unsigned short integer.",
                     value);
}
// Create a hexadecimal value out of range of the UInt16 type.
let value = Convert.ToString(Int16.MinValue, 16)
// Convert it back to a number.
try
    let number = Convert.ToUInt16(value, 16)
    printfn $"0x{value} converts to {number}."
with :? OverflowException ->
    printfn $"Unable to convert '0x{value}' to an unsigned short integer."
' Create a hexadecimal value out of range of the UInt16 type.
Dim value As String = Convert.ToString(Short.MinValue, 16)
' Convert it back to a number.
Try
   Dim number As UInt16 = Convert.ToUInt16(value, 16)
   Console.WriteLine("0x{0} converts to {1}.", value, number)
Catch e As OverflowException
   Console.WriteLine("Unable to convert '0x{0}' to an unsigned short integer.", _
                     value)
End Try

Al realizar operaciones binarias o conversiones numéricas, siempre es responsabilidad del desarrollador comprobar que un método o operador usa la representación numérica adecuada para interpretar un valor determinado. En el ejemplo siguiente se muestra una técnica para asegurarse de que el método no usa inapropiadamente la representación binaria para interpretar un valor que usa la representación complementaria de dos al convertir una cadena hexadecimal en un UInt16 valor. En el ejemplo se determina si un valor representa un entero con signo o sin signo mientras convierte ese valor en su representación de cadena. Cuando el ejemplo convierte el valor en un UInt16 valor, comprueba si el valor original era un entero con signo. Si es así, y si se establece su bit de orden alto (lo que indica que el valor original era negativo), el método produce una excepción.

// Create a negative hexadecimal value out of range of the UInt16 type.
short sourceNumber = Int16.MinValue;
bool isSigned = Math.Sign((short)sourceNumber.GetType().GetField("MinValue").GetValue(null)) == -1;
string value = Convert.ToString(sourceNumber, 16);
UInt16 targetNumber;
try
{
   targetNumber = Convert.ToUInt16(value, 16);
   if (isSigned && ((targetNumber & 0x8000) != 0))
      throw new OverflowException();
   else
      Console.WriteLine("0x{0} converts to {1}.", value, targetNumber);
}
catch (OverflowException)
{
   Console.WriteLine("Unable to convert '0x{0}' to an unsigned short integer.", value);
}
// Displays the following to the console:
//    Unable to convert '0x8000' to an unsigned short integer.
// Create a negative hexadecimal value out of range of the UInt16 type.
let sourceNumber = Int16.MinValue
let isSigned = sign (sourceNumber.GetType().GetField("MinValue").GetValue null :?> int16) = -1
let value = Convert.ToString(sourceNumber, 16)
try
    let targetNumber = Convert.ToUInt16(value, 16)
    if isSigned && targetNumber &&& 0x8000us <> 0us then
        raise (OverflowException())
    else
        printfn $"0x{value} converts to {targetNumber}."
with :? OverflowException ->
    printfn $"Unable to convert '0x{value}' to an unsigned short integer."
// Displays the following to the console:
//    Unable to convert '0x8000' to an unsigned short integer.
' Create a negative hexadecimal value out of range of the UInt16 type.
Dim sourceNumber As Short = Short.MinValue
Dim isSigned As Boolean = Math.Sign(sourceNumber.MinValue) = -1
Dim value As String = Convert.ToString(sourceNumber, 16)
Dim targetNumber As UInt16
Try
   targetNumber = Convert.ToUInt16(value, 16)
   If isSigned And ((targetNumber And &H8000) <> 0) Then
      Throw New OverflowException()
   Else 
      Console.WriteLine("0x{0} converts to {1}.", value, targetNumber)
   End If    
Catch e As OverflowException
   Console.WriteLine("Unable to convert '0x{0}' to an unsigned short integer.", _
                     value)
End Try 
' Displays the following to the console:
'    Unable to convert '0x8000' to an unsigned short integer.

Se aplica a

ToUInt16(Object, IFormatProvider)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Importante

Esta API no es conforme a CLS.

Convierte el valor del objeto especificado en un entero de 16 bits sin signo, usando la información de formato específica de la referencia cultural indicada.

public:
 static System::UInt16 ToUInt16(System::Object ^ value, IFormatProvider ^ provider);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (object value, IFormatProvider provider);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (object? value, IFormatProvider? provider);
[<System.CLSCompliant(false)>]
static member ToUInt16 : obj * IFormatProvider -> uint16
Public Shared Function ToUInt16 (value As Object, provider As IFormatProvider) As UShort

Parámetros

value
Object

Objeto que implementa la interfaz IConvertible.

provider
IFormatProvider

Objeto que proporciona información de formato específica de la referencia cultural.

Devoluciones

Un entero de 16 bits sin signo equivalente a value, o cero si value es null.

Atributos

Excepciones

value no tiene un formato adecuado.

value no implementa la interfaz IConvertible.

O bien

No se admite la conversión.

value representa un número menor que UInt16.MinValue o mayor que UInt16.MaxValue.

Ejemplos

En el ejemplo siguiente se define una HexString clase que implementa la IConvertible interfaz y que está diseñada para contener la representación de cadena de los valores sin signo de 16 y 16 bits. La clase incluye una Sign propiedad que indica el signo de su valor hexadecimal.

using System;
using System.Globalization;
using System.Text.RegularExpressions;

public enum SignBit { Negative=-1, Zero=0, Positive=1 };

public struct HexString : IConvertible
{
   private SignBit signBit;
   private string hexString;

   public SignBit Sign
   {
      set { signBit = value; }
      get { return signBit; }
   }

   public string Value
   {
      set {
         if (value.Trim().Length > 4)
            throw new ArgumentException("The string representation of a 160bit integer cannot have more than four characters.");
         else if (! Regex.IsMatch(value, "([0-9,A-F]){1,4}", RegexOptions.IgnoreCase))
            throw new ArgumentException("The hexadecimal representation of a 16-bit integer contains invalid characters.");
         else
            hexString = value;
      }
      get { return hexString; }
   }

   // IConvertible implementations.
   public TypeCode GetTypeCode() {
      return TypeCode.Object;
   }

   public bool ToBoolean(IFormatProvider provider)
   {
      return signBit != SignBit.Zero;
   }

   public byte ToByte(IFormatProvider provider)
   {
      if (signBit == SignBit.Negative)
         throw new OverflowException(String.Format("{0} is out of range of the Byte type.", Convert.ToInt16(hexString, 16)));
      else
         try {
            return Convert.ToByte(UInt16.Parse(hexString, NumberStyles.HexNumber));
         }
         catch (OverflowException e) {
            throw new OverflowException(String.Format("{0} is out of range of the UInt16 type.", Convert.ToUInt16(hexString, 16)), e);
         }
   }

   public char ToChar(IFormatProvider provider)
   {
      if (signBit == SignBit.Negative) {
         throw new OverflowException(String.Format("{0} is out of range of the Char type.", Convert.ToInt16(hexString, 16)));
      }

      UInt16 codePoint = UInt16.Parse(this.hexString, NumberStyles.HexNumber);
      return Convert.ToChar(codePoint);
   }

   public DateTime ToDateTime(IFormatProvider provider)
   {
      throw new InvalidCastException("Hexadecimal to DateTime conversion is not supported.");
   }

   public decimal ToDecimal(IFormatProvider provider)
   {
      if (signBit == SignBit.Negative)
      {
         short hexValue = Int16.Parse(hexString, NumberStyles.HexNumber);
         return Convert.ToDecimal(hexValue);
      }
      else
      {
         ushort hexValue = UInt16.Parse(hexString, NumberStyles.HexNumber);
         return Convert.ToDecimal(hexValue);
      }
   }

   public double ToDouble(IFormatProvider provider)
   {
      if (signBit == SignBit.Negative)
         return Convert.ToDouble(Int16.Parse(hexString, NumberStyles.HexNumber));
      else
         return Convert.ToDouble(UInt16.Parse(hexString, NumberStyles.HexNumber));
   }

   public short ToInt16(IFormatProvider provider)
   {
      if (signBit == SignBit.Negative)
         return Int16.Parse(hexString, NumberStyles.HexNumber);
      else
         try {
            return Convert.ToInt16(UInt16.Parse(hexString, NumberStyles.HexNumber));
         }
         catch (OverflowException e) {
            throw new OverflowException(String.Format("{0} is out of range of the Int16 type.",
                                                      Convert.ToUInt16(hexString, 16)), e);
         }
   }

   public int ToInt32(IFormatProvider provider)
   {
      if (signBit == SignBit.Negative)
         return Convert.ToInt32(Int16.Parse(hexString, NumberStyles.HexNumber));
      else
         return Convert.ToInt32(UInt16.Parse(hexString, NumberStyles.HexNumber));
   }

   public long ToInt64(IFormatProvider provider)
   {
      if (signBit == SignBit.Negative)
         return Convert.ToInt64(Int16.Parse(hexString, NumberStyles.HexNumber));
      else
         return Int64.Parse(hexString, NumberStyles.HexNumber);
   }

   public sbyte ToSByte(IFormatProvider provider)
   {
      if (signBit == SignBit.Negative)
         try {
            return Convert.ToSByte(Int16.Parse(hexString, NumberStyles.HexNumber));
         }
         catch (OverflowException e) {
            throw new OverflowException(String.Format("{0} is outside the range of the SByte type.",
                                                      Int16.Parse(hexString, NumberStyles.HexNumber), e));
         }
      else
         try {
            return Convert.ToSByte(UInt16.Parse(hexString, NumberStyles.HexNumber));
         }
         catch (OverflowException e) {
            throw new OverflowException(String.Format("{0} is outside the range of the SByte type.",
                                                   UInt16.Parse(hexString, NumberStyles.HexNumber)), e);
         }
   }

   public float ToSingle(IFormatProvider provider)
   {
      if (signBit == SignBit.Negative)
         return Convert.ToSingle(Int16.Parse(hexString, NumberStyles.HexNumber));
      else
         return Convert.ToSingle(UInt16.Parse(hexString, NumberStyles.HexNumber));
   }

   public string ToString(IFormatProvider provider)
   {
      return "0x" + this.hexString;
   }

   public object ToType(Type conversionType, IFormatProvider provider)
   {
      switch (Type.GetTypeCode(conversionType))
      {
         case TypeCode.Boolean:
            return this.ToBoolean(null);
         case TypeCode.Byte:
            return this.ToByte(null);
         case TypeCode.Char:
            return this.ToChar(null);
         case TypeCode.DateTime:
            return this.ToDateTime(null);
         case TypeCode.Decimal:
            return this.ToDecimal(null);
         case TypeCode.Double:
            return this.ToDouble(null);
         case TypeCode.Int16:
            return this.ToInt16(null);
         case TypeCode.Int32:
            return this.ToInt32(null);
         case TypeCode.Int64:
            return this.ToInt64(null);
         case TypeCode.Object:
            if (typeof(HexString).Equals(conversionType))
               return this;
            else
               throw new InvalidCastException(String.Format("Conversion to a {0} is not supported.", conversionType.Name));
         case TypeCode.SByte:
            return this.ToSByte(null);
         case TypeCode.Single:
            return this.ToSingle(null);
         case TypeCode.String:
            return this.ToString(null);
         case TypeCode.UInt16:
            return this.ToUInt16(null);
         case TypeCode.UInt32:
            return this.ToUInt32(null);
         case TypeCode.UInt64:
            return this.ToUInt64(null);
         default:
            throw new InvalidCastException(String.Format("Conversion to {0} is not supported.", conversionType.Name));
      }
   }

   public UInt16 ToUInt16(IFormatProvider provider)
   {
      if (signBit == SignBit.Negative)
         throw new OverflowException(String.Format("{0} is outside the range of the UInt16 type.",
                                                   Int16.Parse(hexString, NumberStyles.HexNumber)));
      else
         return UInt16.Parse(hexString, NumberStyles.HexNumber);
   }

   public UInt32 ToUInt32(IFormatProvider provider)
   {
      if (signBit == SignBit.Negative)
         throw new OverflowException(String.Format("{0} is outside the range of the UInt32 type.",
                                                   Int16.Parse(hexString, NumberStyles.HexNumber)));
      else
         return Convert.ToUInt32(hexString, 16);
   }

   public UInt64 ToUInt64(IFormatProvider provider)
   {
      if (signBit == SignBit.Negative)
         throw new OverflowException(String.Format("{0} is outside the range of the UInt64 type.",
                                                   Int64.Parse(hexString, NumberStyles.HexNumber)));
      else
         return Convert.ToUInt64(hexString, 16);
   }
}
open System
open System.Globalization
open System.Text.RegularExpressions

type SignBit =
    | Negative = -1
    | Zero = 0
    | Positive = 1

[<Struct>]
type HexString =
    val mutable private hexString: string

    val mutable Sign: SignBit

    member this.Value
        with get () = this.hexString
        and set (value: string) =
            if value.Trim().Length > 4 then
                invalidArg "value" "The string representation of a 16 bit integer cannot have more than four characters."
            elif Regex.IsMatch(value, "([0-9,A-F]){1,4}", RegexOptions.IgnoreCase) |> not then
                invalidArg "value" "The hexadecimal representation of a 16-bit integer contains invalid characters."
            else
                this.hexString <- value

    interface IConvertible with
        // IConvertible implementations.
        member _.GetTypeCode() =
            TypeCode.Object

        member this.ToBoolean(provider: IFormatProvider) =
            this.Sign <> SignBit.Zero

        member this.ToByte(provider: IFormatProvider) =
            if this.Sign = SignBit.Negative then
                raise (OverflowException $"{Convert.ToInt16(this.hexString, 16)} is out of range of the Byte type.")
            else
                try
                    Convert.ToByte(UInt16.Parse(this.hexString, NumberStyles.HexNumber))
                with :? OverflowException as e ->
                    raise (OverflowException($"{Convert.ToUInt16(this.hexString, 16)} is out of range of the UInt16 type.", e) )

        member this.ToChar(provider: IFormatProvider) =
            if this.Sign = SignBit.Negative then
                raise (OverflowException $"{Convert.ToInt16(this.hexString, 16)} is out of range of the Char type.")

            let codePoint = UInt16.Parse(this.hexString, NumberStyles.HexNumber)
            Convert.ToChar codePoint

        member _.ToDateTime(provider: IFormatProvider) =
            raise (InvalidCastException "Hexadecimal to DateTime conversion is not supported.")

        member this.ToDecimal(provider: IFormatProvider) =
            if this.Sign = SignBit.Negative then
                let hexValue = Int16.Parse(this.hexString, NumberStyles.HexNumber)
                Convert.ToDecimal hexValue
            else
                let hexValue = UInt16.Parse(this.hexString, NumberStyles.HexNumber)
                Convert.ToDecimal hexValue

        member this.ToDouble(provider: IFormatProvider) =
            if this.Sign = SignBit.Negative then
                Convert.ToDouble(Int16.Parse(this.hexString, NumberStyles.HexNumber))
            else
                Convert.ToDouble(UInt16.Parse(this.hexString, NumberStyles.HexNumber))

        member this.ToInt16(provider: IFormatProvider) =
            if this.Sign = SignBit.Negative then
                Int16.Parse(this.hexString, NumberStyles.HexNumber)
            else
                try
                    Convert.ToInt16(UInt16.Parse(this.hexString, NumberStyles.HexNumber))
                with :? OverflowException as e ->
                    raise (OverflowException($"{Convert.ToUInt16(this.hexString, 16)} is out of range of the Int16 type.", e) )

        member this.ToInt32(provider: IFormatProvider) =
            if this.Sign = SignBit.Negative then
                Convert.ToInt32(Int16.Parse(this.hexString, NumberStyles.HexNumber))
            else
                Convert.ToInt32(UInt16.Parse(this.hexString, NumberStyles.HexNumber))

        member this.ToInt64(provider: IFormatProvider) =
            if this.Sign = SignBit.Negative then
                Convert.ToInt64(Int16.Parse(this.hexString, NumberStyles.HexNumber))
            else
                Int64.Parse(this.hexString, NumberStyles.HexNumber)

        member this.ToSByte(provider: IFormatProvider) =
            if this.Sign = SignBit.Negative then
                try
                    Convert.ToSByte(Int16.Parse(this.hexString, NumberStyles.HexNumber))
                with :? OverflowException as e ->
                    raise (OverflowException($"{Int16.Parse(this.hexString, NumberStyles.HexNumber)} is outside the range of the SByte type.", e))
            else
                try
                    Convert.ToSByte(UInt16.Parse(this.hexString, NumberStyles.HexNumber))
                with :? OverflowException as e ->
                    raise (OverflowException($"{UInt16.Parse(this.hexString, NumberStyles.HexNumber)} is outside the range of the SByte type.", e) )

        member this.ToSingle(provider: IFormatProvider) =
            if this.Sign = SignBit.Negative then
                Convert.ToSingle(Int16.Parse(this.hexString, NumberStyles.HexNumber))
            else
                Convert.ToSingle(UInt16.Parse(this.hexString, NumberStyles.HexNumber))

        member this.ToString(provider: IFormatProvider) =
            "0x" + this.hexString

        member this.ToType(conversionType: Type, provider: IFormatProvider) =
            let this = this :> IConvertible
            match Type.GetTypeCode conversionType with
            | TypeCode.Boolean ->
                this.ToBoolean null
            | TypeCode.Byte ->
                this.ToByte null
            | TypeCode.Char ->
                this.ToChar null
            | TypeCode.DateTime ->
                this.ToDateTime null
            | TypeCode.Decimal->
                this.ToDecimal null
            | TypeCode.Double ->
                this.ToDouble null
            | TypeCode.Int16 ->
                this.ToInt16 null
            | TypeCode.Int32 ->
                this.ToInt32 null
            | TypeCode.Int64 ->
                this.ToInt64 null
            | TypeCode.Object ->
                if typeof<HexString>.Equals conversionType then
                    this
                else
                    raise (InvalidCastException $"Conversion to a {conversionType.Name} is not supported.")
            | TypeCode.SByte ->
                this.ToSByte null
            | TypeCode.Single ->
                this.ToSingle null
            | TypeCode.String ->
                this.ToString null
            | TypeCode.UInt16 ->
                this.ToUInt16 null
            | TypeCode.UInt32 ->
                this.ToUInt32 null
            | TypeCode.UInt64 ->
                this.ToUInt64 null
            | _ ->
                raise (InvalidCastException $"Conversion to {conversionType.Name} is not supported.")

        member this.ToUInt16(provider: IFormatProvider) =
            if this.Sign = SignBit.Negative then
                raise (OverflowException $"{Int16.Parse(this.hexString, NumberStyles.HexNumber)} is outside the range of the UInt16 type.")
            else
                UInt16.Parse(this.hexString, NumberStyles.HexNumber)

        member this.ToUInt32(provider: IFormatProvider) =
            if this.Sign = SignBit.Negative then
                raise (OverflowException $"{Int16.Parse(this.hexString, NumberStyles.HexNumber)} is outside the range of the UInt32 type.")
            else
                Convert.ToUInt32(this.hexString, 16)

        member this.ToUInt64(provider: IFormatProvider) =
            if this.Sign = SignBit.Negative then
                raise (OverflowException $"{Int64.Parse(this.hexString, NumberStyles.HexNumber)} is outside the range of the UInt64 type.")
            else
                Convert.ToUInt64(this.hexString, 16)
Imports System.Globalization
Imports System.Text.RegularExpressions

Public Enum SignBit As Integer
   Positive = 1
   Zero = 0
   Negative = -1
End Enum

Public Structure HexString : Implements IConvertible
   Private signBit As SignBit
   Private hexString As String
   
   Public Property Sign As SignBit
      Set
         signBit = value
      End Set
      Get
         Return signBit
      End Get
   End Property
   
   Public Property Value As String
      Set
         If value.Trim().Length > 4 Then
            Throw New ArgumentException("The string representation of a 16-bit integer cannot have more than four characters.")
         Else If Not Regex.IsMatch(value, "([0-9,A-F]){1,4}", RegexOptions.IgnoreCase) Then
            Throw New ArgumentException("The hexadecimal representation of a 16-bit integer contains invalid characters.")             
         Else
            hexString = value
         End If   
      End Set
      Get
         Return hexString
      End Get
   End Property
   
   ' IConvertible implementations.
   Public Function GetTypeCode() As TypeCode _
                   Implements IConvertible.GetTypeCode
      Return TypeCode.Object
   End Function
   
   Public Function ToBoolean(provider As IFormatProvider) As Boolean _
                   Implements IConvertible.ToBoolean
      Return signBit <> SignBit.Zero             
   End Function 
   
   Public Function ToByte(provider As IFormatProvider) As Byte _
                   Implements IConvertible.ToByte
      If signBit = signBit.Negative Then
         Throw New OverflowException(String.Format("{0} is out of range of the Byte type.", Convert.ToInt16(hexString, 16))) 
      Else
         Try
            Return Convert.ToByte(Int16.Parse(hexString, NumberStyles.HexNumber))
         Catch e As OverflowException
            Throw New OverflowException(String.Format("{0} is out of range of the UInt16 type.", Convert.ToUInt16(hexString, 16)), e)
         End Try   
      End If       
   End Function
   
   Public Function ToChar(provider As IFormatProvider) As Char _
                   Implements IConvertible.ToChar
      If signBit = signBit.Negative Then 
         Throw New OverflowException(String.Format("{0} is out of range of the Char type.", Convert.ToInt16(hexString, 16)))
      End If
      
      Dim codePoint As UInt16 = UInt16.Parse(Me.hexString, NumberStyles.HexNumber)
      Return Convert.ToChar(codePoint)
   End Function 
   
   Public Function ToDateTime(provider As IFormatProvider) As Date _
                   Implements IConvertible.ToDateTime
      Throw New InvalidCastException("Hexadecimal to DateTime conversion is not supported.")
   End Function
   
   Public Function ToDecimal(provider As IFormatProvider) As Decimal _
                   Implements IConvertible.ToDecimal
      If signBit = signBit.Negative Then
         Dim hexValue As Short = Int16.Parse(hexString, NumberStyles.HexNumber)
         Return Convert.ToDecimal(hexValue)
      Else
         Dim hexValue As UShort = UInt16.Parse(hexString, NumberStyles.HexNumber)
         Return Convert.ToDecimal(hexValue)
      End If
   End Function
   
   Public Function ToDouble(provider As IFormatProvider) As Double _
                   Implements IConvertible.ToDouble
      If signBit = signBit.Negative Then
         Return Convert.ToDouble(Int16.Parse(hexString, NumberStyles.HexNumber))
      Else
         Return Convert.ToDouble(UInt16.Parse(hexString, NumberStyles.HexNumber))
      End If   
   End Function   
   
   Public Function ToInt16(provider As IFormatProvider) As Int16 _
                   Implements IConvertible.ToInt16
      If signBit = SignBit.Negative Then
         Return Int16.Parse(hexString, NumberStyles.HexNumber)
      Else
         Try
            Return Convert.ToInt16(UInt16.Parse(hexString, NumberStyles.HexNumber))
         Catch e As OverflowException
            Throw New OverflowException(String.Format("{0} is out of range of the Int16 type.", Convert.ToUInt16(hexString, 16)), e)
         End Try
      End If   
   End Function
   
   Public Function ToInt32(provider As IFormatProvider) As Int32 _
                   Implements IConvertible.ToInt32
      If signBit = SignBit.Negative Then
         Return Convert.ToInt32(Int16.Parse(hexString, NumberStyles.HexNumber))
      Else
         Return Convert.ToInt32(UInt16.Parse(hexString, NumberStyles.HexNumber))
      End If   
   End Function
   
   Public Function ToInt64(provider As IFormatProvider) As Int64 _
                   Implements IConvertible.ToInt64
      If signBit = signBit.Negative Then
         Return Convert.ToInt64(Int16.Parse(hexString, NumberStyles.HexNumber))
      Else
         Return Int64.Parse(hexString, NumberStyles.HexNumber)
      End If   
   End Function
   
   Public Function ToSByte(provider As IFormatProvider) As SByte _
                   Implements IConvertible.ToSByte
      If signBit = signBit.Negative Then
         Try
            Return Convert.ToSByte(Int16.Parse(hexString, NumberStyles.HexNumber))
         Catch e As OverflowException
            Throw New OverflowException(String.Format("{0} is outside the range of the SByte type.", _
                                                      Int16.Parse(hexString, NumberStyles.HexNumber), e))
         End Try
      Else
         Try
            Return Convert.ToSByte(UInt16.Parse(hexString, NumberStyles.HexNumber))
         Catch e As OverflowException
            Throw New OverflowException(String.Format("{0} is outside the range of the SByte type.", _
                                                    UInt16.Parse(hexString, NumberStyles.HexNumber)), e)
         End Try   
      End If
   End Function

   Public Function ToSingle(provider As IFormatProvider) As Single _
                   Implements IConvertible.ToSingle
      If signBit = signBit.Negative Then
         Return Convert.ToSingle(Int16.Parse(hexString, NumberStyles.HexNumber))
      Else
         Return Convert.ToSingle(UInt16.Parse(hexString, NumberStyles.HexNumber))
      End If   
   End Function

   Public Overloads Function ToString(provider As IFormatProvider) As String _
                   Implements IConvertible.ToString
      Return "0x" & Me.hexString
   End Function
   
   Public Function ToType(conversionType As Type, provider As IFormatProvider) As Object _
                   Implements IConvertible.ToType
      Select Case Type.GetTypeCode(conversionType)
         Case TypeCode.Boolean 
            Return Me.ToBoolean(Nothing)
         Case TypeCode.Byte
            Return Me.ToByte(Nothing)
         Case TypeCode.Char
            Return Me.ToChar(Nothing)
         Case TypeCode.DateTime
            Return Me.ToDateTime(Nothing)
         Case TypeCode.Decimal
            Return Me.ToDecimal(Nothing)
         Case TypeCode.Double
            Return Me.ToDouble(Nothing)
         Case TypeCode.Int16
            Return Me.ToInt16(Nothing)
         Case TypeCode.Int32
            Return Me.ToInt32(Nothing)
         Case TypeCode.Int64
            Return Me.ToInt64(Nothing)
         Case TypeCode.Object
            If GetType(HexString).Equals(conversionType) Then
               Return Me
            Else
               Throw New InvalidCastException(String.Format("Conversion to a {0} is not supported.", conversionType.Name))
            End If 
         Case TypeCode.SByte
            Return Me.ToSByte(Nothing)
         Case TypeCode.Single
            Return Me.ToSingle(Nothing)
         Case TypeCode.String
            Return Me.ToString(Nothing)
         Case TypeCode.UInt16
            Return Me.ToUInt16(Nothing)
         Case TypeCode.UInt32
            Return Me.ToUInt32(Nothing)
         Case TypeCode.UInt64
            Return Me.ToUInt64(Nothing)   
         Case Else
            Throw New InvalidCastException(String.Format("Conversion to {0} is not supported.", conversionType.Name))   
      End Select
   End Function
   
   Public Function ToUInt16(provider As IFormatProvider) As UInt16 _
                   Implements IConvertible.ToUInt16
      If signBit = signBit.Negative Then
         Throw New OverflowException(String.Format("{0} is outside the range of the UInt16 type.", _
                                                   Int16.Parse(hexString, NumberStyles.HexNumber)))
      Else
         Return Convert.ToUInt16(hexString, 16)
      End If   
   End Function

   Public Function ToUInt32(provider As IFormatProvider) As UInt32 _
                   Implements IConvertible.ToUInt32
      If signBit = signBit.Negative Then
         Throw New OverflowException(String.Format("{0} is outside the range of the UInt32 type.", _
                                                   Int16.Parse(hexString, NumberStyles.HexNumber)))
      Else
         Return Convert.ToUInt32(hexString, 16)
      End If   
   End Function
   
   Public Function ToUInt64(provider As IFormatProvider) As UInt64 _
                   Implements IConvertible.ToUInt64
      If signBit = signBit.Negative Then
         Throw New OverflowException(String.Format("{0} is outside the range of the UInt64 type.", _
                                                   Int16.Parse(hexString, NumberStyles.HexNumber)))
      Else
         Return Convert.ToUInt64(hexString, 16)
      End If   
   End Function
   
End Structure

En el ejemplo siguiente se muestra que una llamada al ToUInt16(Object, IFormatProvider) método que pasa un HexString objeto como parámetro, a su vez, llama a la IConvertible.ToUInt16 implementación de la HexString clase .

public class Example
{
   public static void Main()
   {
      ushort positiveValue = 32000;
      short negativeValue = -1;

      HexString positiveString = new HexString();
      positiveString.Sign = (SignBit) Math.Sign(positiveValue);
      positiveString.Value = positiveValue.ToString("X2");

      HexString negativeString = new HexString();
      negativeString.Sign = (SignBit) Math.Sign(negativeValue);
      negativeString.Value = negativeValue.ToString("X2");

      try {
         Console.WriteLine("0x{0} converts to {1}.", positiveString.Value, Convert.ToUInt16(positiveString));
      }
      catch (OverflowException) {
         Console.WriteLine("{0} is outside the range of the UInt16 type.",
                           Int16.Parse(negativeString.Value, NumberStyles.HexNumber));
      }

      try {
         Console.WriteLine("0x{0} converts to {1}.", negativeString.Value, Convert.ToUInt16(negativeString));
      }
      catch (OverflowException) {
         Console.WriteLine("{0} is outside the range of the UInt16 type.",
                           Int16.Parse(negativeString.Value, NumberStyles.HexNumber));
      }
   }
}
// The example displays the following output:
//       0x7D00 converts to 32000.
//       -1 is outside the range of the UInt16 type.
let positiveValue = 32000us
let negativeValue = -1s

let mutable positiveString = HexString()
positiveString.Sign <- Math.Sign positiveValue |> enum
positiveString.Value <- positiveValue.ToString "X2"

let mutable negativeString = HexString()
negativeString.Sign <- sign negativeValue |> enum
negativeString.Value <- negativeValue.ToString "X2"

try
    printfn $"0x{positiveString.Value} converts to {Convert.ToUInt16 positiveString}."
with :? OverflowException ->
    printfn $"{Int16.Parse(negativeString.Value, NumberStyles.HexNumber)} is outside the range of the UInt16 type."

try
    printfn $"0x{negativeString.Value} converts to {Convert.ToUInt16 negativeString}."
with :? OverflowException ->
    printfn $"{Int16.Parse(negativeString.Value, NumberStyles.HexNumber)} is outside the range of the UInt16 type."
// The example displays the following output:
//       0x7D00 converts to 32000.
//       -1 is outside the range of the UInt16 type.
Module Example
   Public Sub Main()
      Dim positiveValue As UInt16 = 32000
      Dim negativeValue As Int16 = -1
      
      
      Dim positiveString As New HexString()
      positiveString.Sign = CType(Math.Sign(positiveValue), SignBit)
      positiveString.Value = positiveValue.ToString("X4")
      
      Dim negativeString As New HexString()
      negativeString.Sign = CType(Math.Sign(negativeValue), SignBit)
      negativeString.Value = negativeValue.ToString("X4")
      
      Try
         Console.WriteLine("0x{0} converts to {1}.", positiveString.Value, Convert.ToUInt16(positiveString))
      Catch e As OverflowException
         Console.WriteLine("{0} is outside the range of the UInt16 type.", _
                           Int16.Parse(positiveString.Value, NumberStyles.HexNumber))
      End Try

      Try
         Console.WriteLine("0x{0} converts to {1}.", negativeString.Value, Convert.ToUInt16(negativeString))
      Catch e As OverflowException
         Console.WriteLine("{0} is outside the range of the UInt16 type.", _
                           Int16.Parse(negativeString.Value, NumberStyles.HexNumber))
      End Try   
   End Sub
End Module
' The example dosplays the following output:
'       0x7D00 converts to 32000.
'       -1 is outside the range of the UInt16 type.

Comentarios

El valor devuelto es el resultado de invocar el IConvertible.ToUInt16 método del tipo subyacente de value.

provider permite al usuario especificar información de conversión específica de la referencia cultural sobre el contenido de value. Por ejemplo, si value es un String objeto que representa un número, provider podría proporcionar información específica de la referencia cultural sobre la notación utilizada para representar ese número.

Los tipos base omiten provider; sin embargo, el parámetro se puede usar si value es un tipo definido por el usuario que implementa la IConvertible interfaz.

Se aplica a

ToUInt16(String, IFormatProvider)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Importante

Esta API no es conforme a CLS.

Convierte la representación de cadena especificada de un número en un entero de 16 bits sin signo equivalente, usando la información de formato específica de la referencia cultural indicada.

public:
 static System::UInt16 ToUInt16(System::String ^ value, IFormatProvider ^ provider);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (string value, IFormatProvider provider);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (string? value, IFormatProvider? provider);
[<System.CLSCompliant(false)>]
static member ToUInt16 : string * IFormatProvider -> uint16
Public Shared Function ToUInt16 (value As String, provider As IFormatProvider) As UShort

Parámetros

value
String

Cadena que contiene el número que se va a convertir.

provider
IFormatProvider

Objeto que proporciona información de formato específica de la referencia cultural.

Devoluciones

Un entero de 16 bits sin signo equivalente al número de value, o 0 (cero) si value es null.

Atributos

Excepciones

value no está formado por un signo opcional seguido de una secuencia de dígitos (de 0 a 9).

value representa un número menor que UInt16.MinValue o mayor que UInt16.MaxValue.

Ejemplos

En el ejemplo siguiente se define un objeto personalizado NumberFormatInfo que reconoce la cadena "pos" como el signo positivo y la cadena "neg" como signo negativo. A continuación, intenta convertir cada elemento de una matriz de cadenas numéricas en un entero mediante este proveedor y el NumberFormatInfo proveedor para la referencia cultural invariable.

using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      // Create a NumberFormatInfo object and set several of its
      // properties that apply to numbers.
      NumberFormatInfo provider = new NumberFormatInfo();
      provider.PositiveSign = "pos ";
      provider.NegativeSign = "neg ";

      // Define an array of strings to convert to UInt16 values.
      string[] values= { "34567", "+34567", "pos 34567", "34567.",
                         "34567.", "65535", "65535", "65535" };

      foreach (string value in values)
      {
         Console.Write("{0,-12:}  -->  ", value);
         try {
            Console.WriteLine("{0,17}", Convert.ToUInt16(value, provider));
         }
         catch (FormatException e) {
            Console.WriteLine("{0,17}", e.GetType().Name);
         }
      }
   }
}
// The example displays the following output:
//       34567         -->              34567
//       +34567        -->    FormatException
//       pos 34567     -->              34567
//       34567.        -->    FormatException
//       34567.        -->    FormatException
//       65535         -->              65535
//       65535         -->              65535
//       65535         -->              65535
open System
open System.Globalization

// Create a NumberFormatInfo object and set several of its
// properties that apply to numbers.
let provider = NumberFormatInfo()
provider.PositiveSign <- "pos "
provider.NegativeSign <- "neg "

// Define an array of strings to convert to UInt16 values.
let values =
    [| "34567"; "+34567"; "pos 34567"; "34567."
       "34567."; "65535"; "65535"; "65535" |]

for value in values do
    printf $"{value,-12}  -->  "
    try
        printfn $"{Convert.ToUInt16(value, provider),17}"
    with :? FormatException as e ->
        printfn $"{e.GetType().Name,17}"
// The example displays the following output:
//       34567         -->              34567
//       +34567        -->    FormatException
//       pos 34567     -->              34567
//       34567.        -->    FormatException
//       34567.        -->    FormatException
//       65535         -->              65535
//       65535         -->              65535
//       65535         -->              65535
Imports System.Globalization

Module Example
   Public Sub Main()
      ' Create a NumberFormatInfo object and set several of its
      ' properties that apply to numbers.
      Dim provider As New NumberFormatInfo()
      provider.PositiveSign = "pos "
      provider.NegativeSign = "neg "

      ' Define an array of strings to convert to UInt16 values.
      Dim values() As String = { "34567", "+34567", "pos 34567", _
                                 "34567.", "34567.", "65535", _
                                 "65535", "65535" }         

      For Each value As String In values
         Console.Write("{0,-12:}  -->  ", value)
         Try
            Console.WriteLine("{0,17}", Convert.ToUInt16(value, provider))
         Catch e As FormatException       
            Console.WriteLine("{0,17}", e.GetType().Name)
         End Try     
      Next
    End Sub 
End Module 
' The example displays the following output:
'       34567         -->              34567
'       +34567        -->    FormatException
'       pos 34567     -->              34567
'       34567.        -->    FormatException
'       34567.        -->    FormatException
'       65535         -->              65535
'       65535         -->              65535
'       65535         -->              65535

Comentarios

El valor devuelto es el resultado de invocar UInt16.Parse en value.

provider es una IFormatProvider instancia de que obtiene un NumberFormatInfo objeto . El NumberFormatInfo objeto proporciona información específica de la referencia cultural sobre el formato de value. Si provider es null, se usa para NumberFormatInfo la referencia cultural actual.

Si prefiere no controlar una excepción si se produce un error en la conversión, puede llamar al UInt16.TryParse método en su lugar. Devuelve un Boolean valor que indica si la conversión se realizó correctamente o no.

Se aplica a

ToUInt16(Single)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Importante

Esta API no es conforme a CLS.

Convierte el valor del número de punto flotante de precisión sencilla especificado en un entero de 16 bits sin signo equivalente.

public:
 static System::UInt16 ToUInt16(float value);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (float value);
[<System.CLSCompliant(false)>]
static member ToUInt16 : single -> uint16
Public Shared Function ToUInt16 (value As Single) As UShort

Parámetros

value
Single

Número de punto flotante de precisión sencilla que se va a convertir.

Devoluciones

value, redondeado al entero de 16 bits sin signo más próximo. Si value está en medio de dos números enteros, se devuelve el número par, es decir, 4,5 se convierte en 4 y 5,5 se convierte en 6.

Atributos

Excepciones

value es menor que cero o mayor que UInt16.MaxValue.

Ejemplos

En el ejemplo siguiente se convierte cada elemento de una matriz de String valores en un entero de 16 bits sin signo.

float[] numbers = { Single.MinValue, -1.38e10f, -1023.299f, -12.98f,
                   0f, 9.113e-16f, 103.919f, 17834.191f, Single.MaxValue };
ushort result;

foreach (float number in numbers)
{
   try {
      result = Convert.ToUInt16(number);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("{0} is outside the range of the UInt16 type.", number);
   }
}
// The example displays the following output:
//    -3.402823E+38 is outside the range of the UInt16 type.
//    -1.38E+10 is outside the range of the UInt16 type.
//    -1023.299 is outside the range of the UInt16 type.
//    -12.98 is outside the range of the UInt16 type.
//    Converted the Single value '0' to the UInt16 value 0.
//    Converted the Single value '9.113E-16' to the UInt16 value 0.
//    Converted the Single value '103.919' to the UInt16 value 104.
//    Converted the Single value '17834.19' to the UInt16 value 17834.
//    3.402823E+38 is outside the range of the UInt16 type.
let numbers = 
    [| Single.MinValue; -1.38e10f; -1023.299f; -12.98f
       0f; 9.113e-16f; 103.919f; 17834.191f; Single.MaxValue |]

for number in numbers do
    try
        let result = Convert.ToUInt16 number
        printfn $"Converted the {number.GetType().Name} value '{number}' to the {result.GetType().Name} value {result}."
    with :? OverflowException ->
        printfn $"{number} is outside the range of the UInt16 type."
// The example displays the following output:
//    -3.402823E+38 is outside the range of the UInt16 type.
//    -1.38E+10 is outside the range of the UInt16 type.
//    -1023.299 is outside the range of the UInt16 type.
//    -12.98 is outside the range of the UInt16 type.
//    Converted the Single value '0' to the UInt16 value 0.
//    Converted the Single value '9.113E-16' to the UInt16 value 0.
//    Converted the Single value '103.919' to the UInt16 value 104.
//    Converted the Single value '17834.19' to the UInt16 value 17834.
//    3.402823E+38 is outside the range of the UInt16 type.
Dim values() As Single = { Single.MinValue, -1.38e10, -1023.299, -12.98, _
                           0, 9.113e-16, 103.919, 17834.191, Single.MaxValue }
Dim result As UShort

For Each value As Single In values
   Try
      result = Convert.ToUInt16(value)
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                        value.GetType().Name, value, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("{0} is outside the range of the UInt16 type.", value)
   End Try   
Next                                 
' The example displays the following output:
'    -3.402823E+38 is outside the range of the UInt16 type.
'    -1.38E+10 is outside the range of the UInt16 type.
'    -1023.299 is outside the range of the UInt16 type.
'    -12.98 is outside the range of the UInt16 type.
'    Converted the Single value '0' to the UInt16 value 0.
'    Converted the Single value '9.113E-16' to the UInt16 value 0.
'    Converted the Single value '103.919' to the UInt16 value 104.
'    Converted the Single value '17834.19' to the UInt16 value 17834.
'    3.402823E+38 is outside the range of the UInt16 type.

Consulte también

Se aplica a

ToUInt16(UInt64)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Importante

Esta API no es conforme a CLS.

Convierte el valor del entero de 64 bits sin signo especificado en un entero de 16 bits sin signo equivalente.

public:
 static System::UInt16 ToUInt16(System::UInt64 value);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (ulong value);
[<System.CLSCompliant(false)>]
static member ToUInt16 : uint64 -> uint16
Public Shared Function ToUInt16 (value As ULong) As UShort

Parámetros

value
UInt64

Entero de 64 bits sin signo que se va a convertir.

Devoluciones

Un entero de 16 bits sin signo equivalente a value.

Atributos

Excepciones

value es mayor que UInt16.MaxValue.

Ejemplos

En el ejemplo siguiente se intenta convertir cada elemento en una matriz de enteros largos sin signo en un entero de 16 bits sin signo.

ulong[] numbers = { UInt64.MinValue, 121, 340, UInt64.MaxValue };
ushort result;

foreach (ulong number in numbers)
{
   try {
      result = Convert.ToUInt16(number);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the UInt16 type.",
                        number.GetType().Name, number);
   }
}
// The example displays the following output:
//    Converted the UInt64 value '0' to the UInt16 value 0.
//    Converted the UInt64 value '121' to the UInt16 value 121.
//    Converted the UInt64 value '340' to the UInt16 value 340.
//    The UInt64 value 18446744073709551615 is outside the range of the UInt16 type.
let numbers = [| UInt64.MinValue; 121uL; 340uL; UInt64.MaxValue |]

for number in numbers do
    try
        let result = Convert.ToUInt16 number
        printfn $"Converted the {number.GetType().Name} value '{number}' to the {result.GetType().Name} value {result}."
    with :? OverflowException ->
        printfn $"The {number.GetType().Name} value {number} is outside the range of the UInt16 type."
// The example displays the following output:
//    Converted the UInt64 value '0' to the UInt16 value 0.
//    Converted the UInt64 value '121' to the UInt16 value 121.
//    Converted the UInt64 value '340' to the UInt16 value 340.
//    The UInt64 value 18446744073709551615 is outside the range of the UInt16 type.
Dim numbers() As ULong = { UInt64.MinValue, 121, 340, UInt64.MaxValue }
Dim result As UShort
For Each number As ULong In numbers
   Try
      result = Convert.ToUInt16(number)
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                        number.GetType().Name, number, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is outside the range of the UInt16 type.", _
                        number.GetType().Name, number)
   End Try
Next
' The example displays the following output:
'    Converted the UInt64 value '0' to the UInt16 value 0.
'    Converted the UInt64 value '121' to the UInt16 value 121.
'    Converted the UInt64 value '340' to the UInt16 value 340.
'    The UInt64 value 18446744073709551615 is outside the range of the UInt16 type.

Se aplica a

ToUInt16(SByte)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Importante

Esta API no es conforme a CLS.

Convierte el valor del entero de 8 bits con signo especificado en un entero de 16 bits sin signo equivalente.

public:
 static System::UInt16 ToUInt16(System::SByte value);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (sbyte value);
[<System.CLSCompliant(false)>]
static member ToUInt16 : sbyte -> uint16
Public Shared Function ToUInt16 (value As SByte) As UShort

Parámetros

value
SByte

Entero de 8 bits con signo que se va a convertir.

Devoluciones

Un entero de 16 bits sin signo equivalente a value.

Atributos

Excepciones

value es menor que cero.

Ejemplos

En el ejemplo siguiente se convierte cada elemento de una matriz de bytes con signo en un entero de 16 bits sin signo.

sbyte[] numbers = { SByte.MinValue, -1, 0, 10, SByte.MaxValue };
ushort result;

foreach (sbyte number in numbers)
{
   try {
      result = Convert.ToUInt16(number);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("{0} is outside the range of the UInt16 type.", number);
   }
}
// The example displays the following output:
//    -128 is outside the range of the UInt16 type.
//    -1 is outside the range of the UInt16 type.
//    Converted the SByte value '0' to the UInt16 value 0.
//    Converted the SByte value '10' to the UInt16 value 10.
//    Converted the SByte value '127' to the UInt16 value 127.
let numbers = [| SByte.MinValue; -1y; 0y; 10y; SByte.MaxValue |]

for number in numbers do
    try
        let result = Convert.ToUInt16 number
        printfn $"Converted the {number.GetType().Name} value '{number}' to the {result.GetType().Name} value {result}."
    with :? OverflowException ->
        printfn $"{number} is outside the range of the UInt16 type."
// The example displays the following output:
//    -128 is outside the range of the UInt16 type.
//    -1 is outside the range of the UInt16 type.
//    Converted the SByte value '0' to the UInt16 value 0.
//    Converted the SByte value '10' to the UInt16 value 10.
//    Converted the SByte value '127' to the UInt16 value 127.
Dim numbers() As SByte = { SByte.MinValue, -1, 0, 10, SByte.MaxValue }
Dim result As UShort

For Each number As SByte In numbers
   Try
      result = Convert.ToUInt16(number)
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                        number.GetType().Name, number, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("{0} is outside the range of the UInt16 type.", number)
   End Try
Next
' The example displays the following output:
'    -128 is outside the range of the UInt16 type.
'    -1 is outside the range of the UInt16 type.
'    Converted the SByte value '0' to the UInt16 value 0.
'    Converted the SByte value '10' to the UInt16 value 10.
'    Converted the SByte value '127' to the UInt16 value 127.

Se aplica a

ToUInt16(Char)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Importante

Esta API no es conforme a CLS.

Convierte el valor del carácter Unicode especificado en un entero de 16 bits sin signo equivalente.

public:
 static System::UInt16 ToUInt16(char value);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (char value);
[<System.CLSCompliant(false)>]
static member ToUInt16 : char -> uint16
Public Shared Function ToUInt16 (value As Char) As UShort

Parámetros

value
Char

Carácter Unicode que se va a convertir.

Devoluciones

Entero de 16 bits sin signo que equivale a value.

Atributos

Ejemplos

En el ejemplo siguiente se convierte cada elemento de una matriz de caracteres en un entero de 16 bits sin signo.

char[] chars = { 'a', 'z', '\x0007', '\x03FF',
                 '\x7FFF', '\xFFFE' };
ushort result;

foreach (char ch in chars)
{
   try {
      result = Convert.ToUInt16(ch);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        ch.GetType().Name, ch,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("Unable to convert u+{0} to a UInt16.",
                        ((int)ch).ToString("X4"));
   }
}
// The example displays the following output:
//    Converted the Char value 'a' to the UInt16 value 97.
//    Converted the Char value 'z' to the UInt16 value 122.
//    Converted the Char value '' to the UInt16 value 7.
//    Converted the Char value '?' to the UInt16 value 1023.
//    Converted the Char value '?' to the UInt16 value 32767.
//    Converted the Char value '?' to the UInt16 value 65534.
let chars = 
    [| 'a'; 'z'; '\u0007'; '\u03FF'; '\u7FFF'; '\uFFFE' |]

for ch in chars do
    try
        let result = Convert.ToUInt16 ch
        printfn $"Converted the {ch.GetType().Name} value '{ch}' to the {result.GetType().Name} value {result}."
    with :? OverflowException ->
        printfn $"Unable to convert u+{int ch:X4} to a UInt16."
// The example displays the following output:
//    Converted the Char value 'a' to the UInt16 value 97.
//    Converted the Char value 'z' to the UInt16 value 122.
//    Converted the Char value '' to the UInt16 value 7.
//    Converted the Char value '?' to the UInt16 value 1023.
//    Converted the Char value '?' to the UInt16 value 32767.
//    Converted the Char value '?' to the UInt16 value 65534.
Dim chars() As Char = { "a"c, "z"c, ChrW(7), ChrW(1023), _
                        ChrW(Short.MaxValue), ChrW(&hFFFE) }
Dim result As UShort
                        
For Each ch As Char in chars
   result = Convert.ToUInt16(ch)
   Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                     ch.GetType().Name, ch, _
                     result.GetType().Name, result)
Next   
' The example displays the following output:
'    Converted the Char value 'a' to the UInt16 value 97.
'    Converted the Char value 'z' to the UInt16 value 122.
'    Converted the Char value '' to the UInt16 value 7.
'    Converted the Char value '?' to the UInt16 value 1023.
'    Converted the Char value '?' to the UInt16 value 32767.
'    Converted the Char value '?' to the UInt16 value 65534.

Se aplica a

ToUInt16(Int64)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Importante

Esta API no es conforme a CLS.

Convierte el valor del entero de 64 bits con signo especificado en un entero de 16 bits sin signo equivalente.

public:
 static System::UInt16 ToUInt16(long value);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (long value);
[<System.CLSCompliant(false)>]
static member ToUInt16 : int64 -> uint16
Public Shared Function ToUInt16 (value As Long) As UShort

Parámetros

value
Int64

Entero de 64 bits con signo que se va a convertir.

Devoluciones

Un entero de 16 bits sin signo equivalente a value.

Atributos

Excepciones

value es menor que cero o mayor que UInt16.MaxValue.

Ejemplos

En el ejemplo siguiente se convierte cada elemento de una matriz de enteros largo en un entero de 16 bits sin signo.

long[] numbers = { Int64.MinValue, -1, 0, 121, 340, Int64.MaxValue };
ushort result;

foreach (long number in numbers)
{
   try {
      result = Convert.ToUInt16(number);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the UInt16 type.",
                        number.GetType().Name, number);
   }
}
// The example displays the following output:
//    The Int64 value -9223372036854775808 is outside the range of the UInt16 type.
//    The Int64 value -1 is outside the range of the UInt16 type.
//    Converted the Int64 value '0' to the UInt16 value 0.
//    Converted the Int64 value '121' to the UInt16 value 121.
//    Converted the Int64 value '340' to the UInt16 value 340.
//    The Int64 value 9223372036854775807 is outside the range of the UInt16 type.
let numbers = [| Int64.MinValue; -1; 0; 121; 340; Int64.MaxValue |]

for number in numbers do
    try
        let result = Convert.ToUInt16 number
        printfn $"Converted the {number.GetType().Name} value '{number}' to the {result.GetType().Name} value {result}."
    with :? OverflowException ->
        printfn "The {number.GetType().Name} value {number} is outside the range of the UInt16 type."
// The example displays the following output:
//    The Int64 value -9223372036854775808 is outside the range of the UInt16 type.
//    The Int64 value -1 is outside the range of the UInt16 type.
//    Converted the Int64 value '0' to the UInt16 value 0.
//    Converted the Int64 value '121' to the UInt16 value 121.
//    Converted the Int64 value '340' to the UInt16 value 340.
//    The Int64 value 9223372036854775807 is outside the range of the UInt16 type.
Dim numbers() As Long = { Int64.MinValue, -1, 0, 121, 340, Int64.MaxValue }
Dim result As UShort
For Each number As Long In numbers
   Try
      result = Convert.ToUInt16(number)
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                        number.GetType().Name, number, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is outside the range of the UInt16 type.", _
                        number.GetType().Name, number)
   End Try
Next
' The example displays the following output:
'    The Int64 value -9223372036854775808 is outside the range of the UInt16 type.
'    The Int64 value -1 is outside the range of the UInt16 type.
'    Converted the Int64 value '0' to the UInt16 value 0.
'    Converted the Int64 value '121' to the UInt16 value 121.
'    Converted the Int64 value '340' to the UInt16 value 340.
'    The Int64 value 9223372036854775807 is outside the range of the UInt16 type.

Se aplica a

ToUInt16(Int32)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Importante

Esta API no es conforme a CLS.

Convierte el valor del entero de 32 bits con signo especificado en un entero de 16 bits sin signo equivalente.

public:
 static System::UInt16 ToUInt16(int value);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (int value);
[<System.CLSCompliant(false)>]
static member ToUInt16 : int -> uint16
Public Shared Function ToUInt16 (value As Integer) As UShort

Parámetros

value
Int32

Entero de 32 bits con signo que se va a convertir.

Devoluciones

Un entero de 16 bits sin signo equivalente a value.

Atributos

Excepciones

value es menor que cero o mayor que UInt16.MaxValue.

Ejemplos

En el ejemplo siguiente se convierte cada elemento de una matriz de enteros en un entero de 16 bits sin signo.

int[] numbers = { Int32.MinValue, -1, 0, 121, 340, Int32.MaxValue };
ushort result;

foreach (int number in numbers)
{
   try {
      result = Convert.ToUInt16(number);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the UInt16 type.",
                        number.GetType().Name, number);
   }
}
// The example displays the following output:
//    The Int32 value -2147483648 is outside the range of the UInt16 type.
//    The Int32 value -1 is outside the range of the UInt16 type.
//    Converted the Int32 value '0' to the UInt16 value 0.
//    Converted the Int32 value '121' to the UInt16 value 121.
//    Converted the Int32 value '340' to the UInt16 value 340.
//    The Int32 value 2147483647 is outside the range of the UInt16 type.
let numbers = [| Int32.MinValue; -1; 0; 121; 340; Int32.MaxValue |]

for number in numbers do
    try
        let result = Convert.ToUInt16 number
        printfn $"Converted the {number.GetType().Name} value '{number}' to the {result.GetType().Name} value {result}."
    with :? OverflowException ->
        printfn "The {number.GetType().Name} value {number} is outside the range of the UInt16 type."
                        
// The example displays the following output:
//    The Int32 value -2147483648 is outside the range of the UInt16 type.
//    The Int32 value -1 is outside the range of the UInt16 type.
//    Converted the Int32 value '0' to the UInt16 value 0.
//    Converted the Int32 value '121' to the UInt16 value 121.
//    Converted the Int32 value '340' to the UInt16 value 340.
//    The Int32 value 2147483647 is outside the range of the UInt16 type.
Dim numbers() As Integer = { Int32.MinValue, -1, 0, 121, 340, Int32.MaxValue }
Dim result As UShort

For Each number As Integer In numbers
   Try
      result = Convert.ToUInt16(number)
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                        number.GetType().Name, number, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is outside the range of the UInt16 type.", _
                        number.GetType().Name, number)
   End Try
Next
' The example displays the following output:
'    The Int32 value -2147483648 is outside the range of the UInt16 type.
'    The Int32 value -1 is outside the range of the UInt16 type.
'    Converted the Int32 value '0' to the UInt16 value 0.
'    Converted the Int32 value '121' to the UInt16 value 121.
'    Converted the Int32 value '340' to the UInt16 value 340.
'    The Int32 value 2147483647 is outside the range of the UInt16 type.

Se aplica a

ToUInt16(Int16)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Importante

Esta API no es conforme a CLS.

Convierte el valor del entero de 16 bits con signo especificado en un entero de 16 bits sin signo equivalente.

public:
 static System::UInt16 ToUInt16(short value);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (short value);
[<System.CLSCompliant(false)>]
static member ToUInt16 : int16 -> uint16
Public Shared Function ToUInt16 (value As Short) As UShort

Parámetros

value
Int16

Entero de 16 bits con signo que se va a convertir.

Devoluciones

Un entero de 16 bits sin signo equivalente a value.

Atributos

Excepciones

value es menor que cero.

Ejemplos

En el ejemplo siguiente se intenta convertir cada elemento de una matriz de enteros de 16 bits en un entero de 16 bits sin signo.

short[] numbers = { Int16.MinValue, -132, 0, 121, 16103, Int16.MaxValue  };
ushort result;

foreach (short number in numbers)
{
   try {
      result = Convert.ToUInt16(number);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the UInt16 type.",
                        number.GetType().Name, number);
   }
}
// The example displays the following output:
//    The Int16 value -32768 is outside the range of the UInt16 type.
//    The Int16 value -132 is outside the range of the UInt16 type.
//    Converted the Int16 value '0' to the UInt16 value 0.
//    Converted the Int16 value '121' to the UInt16 value 121.
//    Converted the Int16 value '16103' to the UInt16 value 16103.
//    Converted the Int16 value '32767' to the UInt16 value 32767.
let numbers = [| Int16.MinValue; -132s; 0s; 121s; 16103s; Int16.MaxValue |]

for number in numbers do
    try
        let result = Convert.ToUInt16 number
        printfn $"Converted the {number.GetType().Name} value '{number}' to the {result.GetType().Name} value {result}."
    with :? OverflowException ->
        printfn $"The {number.GetType().Name} value {number} is outside the range of the UInt16 type."
// The example displays the following output:
//    The Int16 value -32768 is outside the range of the UInt16 type.
//    The Int16 value -132 is outside the range of the UInt16 type.
//    Converted the Int16 value '0' to the UInt16 value 0.
//    Converted the Int16 value '121' to the UInt16 value 121.
//    Converted the Int16 value '16103' to the UInt16 value 16103.
//    Converted the Int16 value '32767' to the UInt16 value 32767.
Dim numbers() As Short = { Int16.MinValue, -132, 0, 121, 16103, Int16.MaxValue }
Dim result As UShort

For Each number As Short In numbers
   Try
      result = Convert.ToUInt16(number)
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                        number.GetType().Name, number, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is outside the range of the UInt16 type.", _
                        number.GetType().Name, number)
   End Try
Next
' The example displays the following output:
'    The Int16 value -32768 is outside the range of the UInt16 type.
'    The Int16 value -132 is outside the range of the UInt16 type.
'    Converted the Int16 value '0' to the UInt16 value 0.
'    Converted the Int16 value '121' to the UInt16 value 121.
'    Converted the Int16 value '16103' to the UInt16 value 16103.
'    Converted the Int16 value '32767' to the UInt16 value 32767.

Se aplica a

ToUInt16(Decimal)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Importante

Esta API no es conforme a CLS.

Convierte el valor del número decimal especificado en un entero de 16 bits sin signo equivalente.

public:
 static System::UInt16 ToUInt16(System::Decimal value);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (decimal value);
[<System.CLSCompliant(false)>]
static member ToUInt16 : decimal -> uint16
Public Shared Function ToUInt16 (value As Decimal) As UShort

Parámetros

value
Decimal

Número decimal que se va a convertir.

Devoluciones

value, redondeado al entero de 16 bits sin signo más próximo. Si value está en medio de dos números enteros, se devuelve el número par, es decir, 4,5 se convierte en 4 y 5,5 se convierte en 6.

Atributos

Excepciones

value es menor que cero o mayor que UInt16.MaxValue.

Ejemplos

En el ejemplo siguiente se convierte cada elemento de una matriz de Decimal valores en un entero de 16 bits sin signo.

decimal[] numbers = { Decimal.MinValue, -1034.23m, -12m, 0m, 147m,
                            9214.16m, Decimal.MaxValue };
ushort result;

foreach (decimal number in numbers)
{
   try {
      result = Convert.ToUInt16(number);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
   }
   catch (OverflowException)
   {
      Console.WriteLine("{0} is outside the range of the UInt16 type.",
                        number);
   }
}
// The example displays the following output:
//    -79228162514264337593543950335 is outside the range of the UInt16 type.
//    -1034.23 is outside the range of the UInt16 type.
//    -12 is outside the range of the UInt16 type.
//    Converted the Decimal value '0' to the UInt16 value 0.
//    Converted the Decimal value '147' to the UInt16 value 147.
//    Converted the Decimal value '9214.16' to the UInt16 value 9214.
//    79228162514264337593543950335 is outside the range of the UInt16 type.
let numbers = 
    [| Decimal.MinValue; -1034.23m; -12m; 0m; 147m; 9214.16m; Decimal.MaxValue |]

for number in numbers do
    try
        let result = Convert.ToUInt16 number
        printfn $"Converted the {number.GetType().Name} value '{number}' to the {result.GetType().Name} value {result}."
    with :? OverflowException ->
        printfn $"{number} is outside the range of the UInt16 type."
// The example displays the following output:
//    -79228162514264337593543950335 is outside the range of the UInt16 type.
//    -1034.23 is outside the range of the UInt16 type.
//    -12 is outside the range of the UInt16 type.
//    Converted the Decimal value '0' to the UInt16 value 0.
//    Converted the Decimal value '147' to the UInt16 value 147.
//    Converted the Decimal value '9214.16' to the UInt16 value 9214.
//    79228162514264337593543950335 is outside the range of the UInt16 type.
Dim values() As Decimal = { Decimal.MinValue, -1034.23d, -12d, 0d, 147d, _
                            9214.16d, Decimal.MaxValue }
Dim result As UShort

For Each value As Decimal In values
   Try
      result = Convert.ToUInt16(value)
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                        value.GetType().Name, value, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("{0} is outside the range of the UInt16 type.", _
                        value)
   End Try   
Next                                  
' The example displays the following output:
'    -79228162514264337593543950335 is outside the range of the UInt16 type.
'    -1034.23 is outside the range of the UInt16 type.
'    -12 is outside the range of the UInt16 type.
'    Converted the Decimal value '0' to the UInt16 value 0.
'    Converted the Decimal value '147' to the UInt16 value 147.
'    Converted the Decimal value '9214.16' to the UInt16 value 9214.
'    79228162514264337593543950335 is outside the range of the UInt16 type.

Consulte también

Se aplica a

ToUInt16(DateTime)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Importante

Esta API no es conforme a CLS.

Cuando se llama a este método, siempre se produce InvalidCastException.

public:
 static System::UInt16 ToUInt16(DateTime value);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (DateTime value);
[<System.CLSCompliant(false)>]
static member ToUInt16 : DateTime -> uint16
Public Shared Function ToUInt16 (value As DateTime) As UShort

Parámetros

value
DateTime

Valor de fecha y hora que se va a convertir.

Devoluciones

No se admite esta conversión. No se devuelve ningún valor.

Atributos

Excepciones

No se admite esta conversión.

Se aplica a

ToUInt16(Byte)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Importante

Esta API no es conforme a CLS.

Convierte el valor del entero de 8 bits sin signo especificado en un entero de 16 bits sin signo equivalente.

public:
 static System::UInt16 ToUInt16(System::Byte value);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (byte value);
[<System.CLSCompliant(false)>]
static member ToUInt16 : byte -> uint16
Public Shared Function ToUInt16 (value As Byte) As UShort

Parámetros

value
Byte

Entero de 8 bits sin signo que se va a convertir.

Devoluciones

Un entero de 16 bits sin signo equivalente a value.

Atributos

Ejemplos

En el ejemplo siguiente se convierte cada elemento de una matriz de bytes en un entero de 16 bits sin signo.

byte[] bytes = { Byte.MinValue, 14, 122, Byte.MaxValue};
ushort result;

foreach (byte byteValue in bytes)
{
   result = Convert.ToUInt16(byteValue);
   Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                     byteValue.GetType().Name, byteValue,
                     result.GetType().Name, result);
}
// The example displays the following output:
//       Converted the Byte value '0' to the UInt16 value 0.
//       Converted the Byte value '14' to the UInt16 value 14.
//       Converted the Byte value '122' to the UInt16 value 122.
//       Converted the Byte value '255' to the UInt16 value 255.
let bytes = [| Byte.MinValue; 14uy; 122uy; Byte.MaxValue |]

for byteValue in bytes do
    let result = Convert.ToUInt16 byteValue
    printfn $"Converted the {byteValue.GetType().Name} value '{byteValue}' to the {result.GetType().Name} value {result}."
// The example displays the following output:
//       Converted the Byte value '0' to the UInt16 value 0.
//       Converted the Byte value '14' to the UInt16 value 14.
//       Converted the Byte value '122' to the UInt16 value 122.
//       Converted the Byte value '255' to the UInt16 value 255.
Dim bytes() As Byte = { Byte.MinValue, 14, 122, Byte.MaxValue}
Dim result As UShort

For Each number As Byte In bytes
   result = Convert.ToUInt16(number)
   Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                     number.GetType().Name, number, _
                     result.GetType().Name, result)
Next
' The example displays the following output:
'    Converted the Byte value '0' to the UInt16 value 0.
'    Converted the Byte value '14' to the UInt16 value 14.
'    Converted the Byte value '122' to the UInt16 value 122.
'    Converted the Byte value '255' to the UInt16 value 255.

Se aplica a

ToUInt16(Boolean)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Importante

Esta API no es conforme a CLS.

Convierte el valor booleano especificado en un entero de 16 bits sin signo equivalente.

public:
 static System::UInt16 ToUInt16(bool value);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (bool value);
[<System.CLSCompliant(false)>]
static member ToUInt16 : bool -> uint16
Public Shared Function ToUInt16 (value As Boolean) As UShort

Parámetros

value
Boolean

Valor booleano que se va a convertir.

Devoluciones

Número 1 si value es true; en caso contrario, 0.

Atributos

Ejemplos

En el ejemplo siguiente se convierten los valores true booleanos y false en enteros de 16 bits sin signo.

bool falseFlag = false;
bool trueFlag = true;

Console.WriteLine("{0} converts to {1}.", falseFlag,
                  Convert.ToInt16(falseFlag));
Console.WriteLine("{0} converts to {1}.", trueFlag,
                  Convert.ToUInt16(trueFlag));
// The example displays the following output:
//       False converts to 0.
//       True converts to 1.
let falseFlag = false
let trueFlag = true

printfn $"{falseFlag} converts to {Convert.ToInt16 falseFlag}."
printfn $"{trueFlag} converts to {Convert.ToInt16 trueFlag}."
// The example displays the following output:
//       False converts to 0.
//       True converts to 1.
Dim falseFlag As Boolean = False
Dim trueFlag As Boolean = True

Console.WriteLine("{0} converts to {1}.", falseFlag, _
                  Convert.ToUInt16(falseFlag))
Console.WriteLine("{0} converts to {1}.", trueFlag, _
                  Convert.ToUInt16(trueFlag))
' The example displays the following output:
'       False converts to 0.
'       True converts to 1.

Se aplica a

ToUInt16(Object)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Importante

Esta API no es conforme a CLS.

Convierte el valor del objeto especificado en un entero de 16 bits sin signo.

public:
 static System::UInt16 ToUInt16(System::Object ^ value);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (object value);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (object? value);
[<System.CLSCompliant(false)>]
static member ToUInt16 : obj -> uint16
Public Shared Function ToUInt16 (value As Object) As UShort

Parámetros

value
Object

Objeto que implementa la interfaz IConvertible o null.

Devoluciones

Un entero de 16 bits sin signo equivalente a value, o cero si value es null.

Atributos

Excepciones

value no tiene un formato adecuado.

value no implementa la interfaz IConvertible.

O bien

No se admite la conversión.

value representa un número menor que UInt16.MinValue o mayor que UInt16.MaxValue.

Ejemplos

En el ejemplo siguiente se intenta convertir cada elemento de una matriz de objetos en un entero de 16 bits sin signo.

object[] values= { true, -12, 163, 935, 'x', new DateTime(2009, 5, 12),
                   "104", "103.0", "-1", "1.00e2", "One", 1.00e2};
ushort result;

foreach (object value in values)
{
   try {
      result = Convert.ToUInt16(value);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        value.GetType().Name, value,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the UInt16 type.",
                        value.GetType().Name, value);
   }
   catch (FormatException) {
      Console.WriteLine("The {0} value {1} is not in a recognizable format.",
                        value.GetType().Name, value);
   }
   catch (InvalidCastException) {
      Console.WriteLine("No conversion to a UInt16 exists for the {0} value {1}.",
                        value.GetType().Name, value);
   }
}
// The example displays the following output:
//    Converted the Boolean value 'True' to the UInt16 value 1.
//    The Int32 value -12 is outside the range of the UInt16 type.
//    Converted the Int32 value '163' to the UInt16 value 163.
//    Converted the Int32 value '935' to the UInt16 value 935.
//    Converted the Char value 'x' to the UInt16 value 120.
//    No conversion to a UInt16 exists for the DateTime value 5/12/2009 12:00:00 AM.
//    Converted the String value '104' to the UInt16 value 104.
//    The String value 103.0 is not in a recognizable format.
//    The String value -1 is outside the range of the UInt16 type.
//    The String value 1.00e2 is not in a recognizable format.
//    The String value One is not in a recognizable format.
//    Converted the Double value '100' to the UInt16 value 100.
let values: obj[] =
    [| true; -12; 163; 935; 'x'; DateTime(2009, 5, 12)
       "104"; "103.0"; "-1"; "1.00e2"; "One"; 1.00e2 |]

for value in values do
    try
        let result = Convert.ToUInt16 value
        printfn $"Converted the {value.GetType().Name} value '{value}' to the {result.GetType().Name} value {result}."
    with 
    | :? OverflowException ->
        printfn $"The {value.GetType().Name} value {value} is outside the range of the UInt16 type."
    | :? FormatException ->
        printfn $"The {value.GetType().Name} value {value} is not in a recognizable format."
    | :? InvalidCastException ->
        printfn $"No conversion to a UInt16 exists for the {value.GetType().Name} value {value}."
// The example displays the following output:
//    Converted the Boolean value 'True' to the UInt16 value 1.
//    The Int32 value -12 is outside the range of the UInt16 type.
//    Converted the Int32 value '163' to the UInt16 value 163.
//    Converted the Int32 value '935' to the UInt16 value 935.
//    Converted the Char value 'x' to the UInt16 value 120.
//    No conversion to a UInt16 exists for the DateTime value 5/12/2009 12:00:00 AM.
//    Converted the String value '104' to the UInt16 value 104.
//    The String value 103.0 is not in a recognizable format.
//    The String value -1 is outside the range of the UInt16 type.
//    The String value 1.00e2 is not in a recognizable format.
//    The String value One is not in a recognizable format.
//    Converted the Double value '100' to the UInt16 value 100.
   Dim values() As Object = { True, -12, 163, 935, "x"c, #5/12/2009#, _
                              "104", "103.0", "-1", _
                              "1.00e2", "One", 1.00e2}
   Dim result As UShort
   
   For Each value As Object In values
      Try
         result = Convert.ToUInt16(value)
         Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                           value.GetType().Name, value, _
                           result.GetType().Name, result)
      Catch e As OverflowException
         Console.WriteLine("The {0} value {1} is outside the range of the UInt16 type.", _
                           value.GetType().Name, value)
      Catch e As FormatException
         Console.WriteLine("The {0} value {1} is not in a recognizable format.", _
                           value.GetType().Name, value)
      Catch e As InvalidCastException
         Console.WriteLine("No conversion to an Int16 exists for the {0} value {1}.", _
                           value.GetType().Name, value)
                           
      End Try
   Next                           
   ' The example displays the following output:
'    Converted the Boolean value 'True' to the UInt16 value 1.
'    The Int32 value -12 is outside the range of the UInt16 type.
'    Converted the Int32 value '163' to the UInt16 value 163.
'    Converted the Int32 value '935' to the UInt16 value 935.
'    Converted the Char value 'x' to the UInt16 value 120.
'    No conversion to an Int16 exists for the DateTime value 5/12/2009 12:00:00 AM.
'    Converted the String value '104' to the UInt16 value 104.
'    The String value 103.0 is not in a recognizable format.
'    The String value -1 is outside the range of the UInt16 type.
'    The String value 1.00e2 is not in a recognizable format.
'    The String value One is not in a recognizable format.
'    Converted the Double value '100' to the UInt16 value 100.

Comentarios

El valor devuelto es el resultado de invocar el IConvertible.ToUInt16 método del tipo subyacente de value.

Se aplica a

ToUInt16(Double)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Importante

Esta API no es conforme a CLS.

Convierte el valor del número de punto flotante de precisión doble especificado en un entero de 16 bits sin signo equivalente.

public:
 static System::UInt16 ToUInt16(double value);
[System.CLSCompliant(false)]
public static ushort ToUInt16 (double value);
[<System.CLSCompliant(false)>]
static member ToUInt16 : double -> uint16
Public Shared Function ToUInt16 (value As Double) As UShort

Parámetros

value
Double

Número de punto flotante de precisión doble que se va a convertir.

Devoluciones

value, redondeado al entero de 16 bits sin signo más próximo. Si value está en medio de dos números enteros, se devuelve el número par, es decir, 4,5 se convierte en 4 y 5,5 se convierte en 6.

Atributos

Excepciones

value es menor que cero o mayor que UInt16.MaxValue.

Ejemplos

En el ejemplo siguiente se convierte cada elemento de una matriz de Double valores en un entero de 16 bits sin signo.

double[] numbers = { Double.MinValue, -1.38e10, -1023.299, -12.98,
                    0, 9.113e-16, 103.919, 17834.191, Double.MaxValue };
ushort result;

foreach (double number in numbers)
{
   try {
      result = Convert.ToUInt16(number);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
   }
   catch (OverflowException)
   {
      Console.WriteLine("{0} is outside the range of the UInt16 type.", number);
   }
}
// The example displays the following output:
//    -1.79769313486232E+308 is outside the range of the UInt16 type.
//    -13800000000 is outside the range of the UInt16 type.
//    -1023.299 is outside the range of the UInt16 type.
//    -12.98 is outside the range of the UInt16 type.
//    Converted the Double value '0' to the UInt16 value 0.
//    Converted the Double value '9.113E-16' to the UInt16 value 0.
//    Converted the Double value '103.919' to the UInt16 value 104.
//    Converted the Double value '17834.191' to the UInt16 value 17834.
//    1.79769313486232E+308 is outside the range of the UInt16 type.
let numbers = 
    [| Double.MinValue; -1.38e10; -1023.299; -12.98
       0; 9.113e-16; 103.919; 17834.191; Double.MaxValue |]

for number in numbers do
    try
        let result = Convert.ToUInt16 number
        printfn $"Converted the {number.GetType().Name} value '{number}' to the {result.GetType().Name} value {result}."
    with :? OverflowException ->
        printfn $"{number} is outside the range of the UInt16 type."
// The example displays the following output:
//    -1.79769313486232E+308 is outside the range of the UInt16 type.
//    -13800000000 is outside the range of the UInt16 type.
//    -1023.299 is outside the range of the UInt16 type.
//    -12.98 is outside the range of the UInt16 type.
//    Converted the Double value '0' to the UInt16 value 0.
//    Converted the Double value '9.113E-16' to the UInt16 value 0.
//    Converted the Double value '103.919' to the UInt16 value 104.
//    Converted the Double value '17834.191' to the UInt16 value 17834.
//    1.79769313486232E+308 is outside the range of the UInt16 type.
Dim values() As Double = { Double.MinValue, -1.38e10, -1023.299, -12.98, _
                           0, 9.113e-16, 103.919, 17834.191, Double.MaxValue }
Dim result As UShort

For Each value As Double In values
   Try
      result = Convert.ToUInt16(value)
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                        value.GetType().Name, value, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("{0} is outside the range of the UInt16 type.", value)
   End Try   
Next                                 
' The example displays the following output:
'    -1.79769313486232E+308 is outside the range of the UInt16 type.
'    -13800000000 is outside the range of the UInt16 type.
'    -1023.299 is outside the range of the UInt16 type.
'    -12.98 is outside the range of the UInt16 type.
'    Converted the Double value '0' to the UInt16 value 0.
'    Converted the Double value '9.113E-16' to the UInt16 value 0.
'    Converted the Double value '103.919' to the UInt16 value 104.
'    Converted the Double value '17834.191' to the UInt16 value 17834.
'    1.79769313486232E+308 is outside the range of the UInt16 type.

Consulte también

Se aplica a