Convert.ToUInt16 方法

定义

将指定的值转换为 16 位无符号整数。Converts a specified value to a 16-bit unsigned integer.

重载

ToUInt16(String)

将数字的指定字符串表示形式转换为等效的 16 位无符号整数。Converts the specified string representation of a number to an equivalent 16-bit unsigned integer.

ToUInt16(UInt16)

返回指定的 16 位无符号整数;不执行任何实际的转换。Returns the specified 16-bit unsigned integer; no actual conversion is performed.

ToUInt16(UInt32)

将指定的 32 位无符号整数的值转换为等效的 16 位无符号整数。Converts the value of the specified 32-bit unsigned integer to an equivalent 16-bit unsigned integer.

ToUInt16(String, Int32)

将指定基数的数字的字符串表示形式转换为等效的 16 位无符号整数。Converts the string representation of a number in a specified base to an equivalent 16-bit unsigned integer.

ToUInt16(Object, IFormatProvider)

使用指定的区域性特定格式信息,将指定对象的值转换为 16 位无符号整数。Converts the value of the specified object to a 16-bit unsigned integer, using the specified culture-specific formatting information.

ToUInt16(String, IFormatProvider)

使用指定的区域性特定格式设置信息,将数字的指定字符串表示形式转换为等效的 16 位无符号整数。Converts the specified string representation of a number to an equivalent 16-bit unsigned integer, using the specified culture-specific formatting information.

ToUInt16(Single)

将指定的单精度浮点数的值转换为等效的 16 位无符号整数。Converts the value of the specified single-precision floating-point number to an equivalent 16-bit unsigned integer.

ToUInt16(UInt64)

将指定的 64 位无符号整数的值转换为等效的 16 位无符号整数。Converts the value of the specified 64-bit unsigned integer to an equivalent 16-bit unsigned integer.

ToUInt16(SByte)

将指定的 8 位有符号整数的值转换为等效的 16 位无符号整数。Converts the value of the specified 8-bit signed integer to the equivalent 16-bit unsigned integer.

ToUInt16(Double)

将指定的双精度浮点数的值转换为等效的 16 位无符号整数。Converts the value of the specified double-precision floating-point number to an equivalent 16-bit unsigned integer.

ToUInt16(Int64)

将指定的 64 位有符号整数的值转换为等效的 16 位无符号整数。Converts the value of the specified 64-bit signed integer to an equivalent 16-bit unsigned integer.

ToUInt16(Object)

将指定对象的值转换为 16 位无符号整数。Converts the value of the specified object to a 16-bit unsigned integer.

ToUInt16(Byte)

将指定的 8 位无符号整数的值转换为等效的 16 位无符号整数。Converts the value of the specified 8-bit unsigned integer to the equivalent 16-bit unsigned integer.

ToUInt16(Char)

将指定 Unicode 字符的值转换为等效的 16 位无符号整数。Converts the value of the specified Unicode character to the equivalent 16-bit unsigned integer.

ToUInt16(DateTime)

调用此方法始终引发 InvalidCastExceptionCalling this method always throws InvalidCastException.

ToUInt16(Boolean)

将指定的布尔值转换为等效的 16 位无符号整数。Converts the specified Boolean value to the equivalent 16-bit unsigned integer.

ToUInt16(Int16)

将指定的 16 位有符号整数的值转换为等效的 16 位无符号整数。Converts the value of the specified 16-bit signed integer to the equivalent 16-bit unsigned integer.

ToUInt16(Int32)

将指定的 32 位有符号整数的值转换为等效的 16 位无符号整数。Converts the value of the specified 32-bit signed integer to an equivalent 16-bit unsigned integer.

ToUInt16(Decimal)

将指定的十进制数的值转换为等效的 16 位无符号整数。Converts the value of the specified decimal number to an equivalent 16-bit unsigned integer.

ToUInt16(String)

重要

此 API 不符合 CLS。

将数字的指定字符串表示形式转换为等效的 16 位无符号整数。Converts the specified string representation of a number to an equivalent 16-bit unsigned integer.

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

参数

value
String

包含要转换的数字的字符串。A string that contains the number to convert.

返回

一个与 value 中数字等效的 16 位无符号整数,如果 valuenull,则为 0(零)。A 16-bit unsigned integer that is equivalent to the number in value, or 0 (zero) if value is null.

属性

异常

value 不由一个可选符号后跟一系列数字 (0-9) 组成。value does not consist of an optional sign followed by a sequence of digits (0 through 9).

value 表示一个小于 MinValue 或大于 MaxValue 的数字。value represents a number that is less than MinValue or greater than MaxValue.

示例

下面的示例尝试将数字字符串数组中的每个元素转换为16位无符号整数。The following example attempts to convert each element in a numeric string array to a 16-bit unsigned integer.

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.      
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.      

注解

使用 ToUInt16(String) 方法等效于将 value 传递到 UInt16.Parse(String) 方法。Using the ToUInt16(String) method is equivalent to passing value to the UInt16.Parse(String) method. 使用当前线程区域性的格式设置约定解释 valuevalue is interpreted by using the formatting conventions of the current thread culture.

如果你不希望在转换失败时处理异常,则可以改为调用 UInt16.TryParse 方法。If you prefer not to handle an exception if the conversion fails, you can call the UInt16.TryParse method instead. 它将返回一个 Boolean 值,该值指示转换是成功还是失败。It returns a Boolean value that indicates whether the conversion succeeded or failed.

ToUInt16(UInt16)

重要

此 API 不符合 CLS。

返回指定的 16 位无符号整数;不执行任何实际的转换。Returns the specified 16-bit unsigned integer; no actual conversion is performed.

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

参数

value
UInt16

要返回的 16 位无符号整数。The 16-bit unsigned integer to return.

返回

不经更改即返回 valuevalue is returned unchanged.

属性

ToUInt16(UInt32)

重要

此 API 不符合 CLS。

将指定的 32 位无符号整数的值转换为等效的 16 位无符号整数。Converts the value of the specified 32-bit unsigned integer to an equivalent 16-bit unsigned integer.

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

参数

value
UInt32

要转换的 32 位无符号整数。The 32-bit unsigned integer to convert.

返回

一个与 value 等效的 16 位无符号整数。A 16-bit unsigned integer that is equivalent to value.

属性

异常

value 大于 MaxValuevalue is greater than MaxValue.

示例

下面的示例尝试将无符号整数数组中的每个元素转换为16位无符号整数。The following example attempts to convert each element in an array of unsigned integers to an unsigned 16-bit integer.

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.
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.

ToUInt16(String, Int32)

重要

此 API 不符合 CLS。

将指定基数的数字的字符串表示形式转换为等效的 16 位无符号整数。Converts the string representation of a number in a specified base to an equivalent 16-bit unsigned integer.

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

参数

value
String

包含要转换的数字的字符串。A string that contains the number to convert.

fromBase
Int32

value 中数字的基数,它必须是 2、8、10 或 16。The base of the number in value, which must be 2, 8, 10, or 16.

返回

一个与 value 中数字等效的 16 位无符号整数,如果 valuenull,则为 0(零)。A 16-bit unsigned integer that is equivalent to the number in value, or 0 (zero) if value is null.

属性

异常

fromBase 不是 2、8、10 或 16。fromBase is not 2, 8, 10, or 16.

- 或 --or- value(表示非 10 为基数的无符号数字)的前面带一个负号。value, which represents a non-base 10 unsigned number, is prefixed with a negative sign.

valueEmptyvalue is Empty.

value 包含一个字符,该字符不是由 fromBase 指定的基数中的有效数字。value contains a character that is not a valid digit in the base specified by fromBase. 如果 value 中的第一个字符无效,则该异常消息指示没有要转换的数字;否则,该消息指示 value 包含无效的尾随字符。The exception message indicates that there are no digits to convert if the first character in value is invalid; otherwise, the message indicates that value contains invalid trailing characters.

value(表示非 10 为基数的无符号数字)的前面带一个负号。value, which represents a non-base 10 unsigned number, is prefixed with a negative sign.

- 或 --or- value 表示一个小于 MinValue 或大于 MaxValue 的数字。value represents a number that is less than MinValue or greater than MaxValue.

示例

下面的示例尝试将数值字符串数组中的每个元素解释为十六进制值,并将其转换为16位无符号整数。The following example attempts to interpret each element in an array of numeric strings as a hexadecimal value and to convert it to an unsigned 16-bit integer.

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.
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.

注解

如果 fromBase 为16,则可以使用 "0x" 或 "0X" 作为 value 参数指定的数字的前缀。If fromBase is 16, you can prefix the number specified by the value parameter with "0x" or "0X".

由于 UInt16 的数据类型仅支持未签名的值,因此 ToUInt16(String, Int32) 方法假定 value 是使用无符号二进制表示形式表示的。Because the UInt16 data type supports unsigned values only, the ToUInt16(String, Int32) method assumes that value is expressed using unsigned binary representation. 换句话说,所有的16位均用于表示数值,并且不存在符号位。In other words, all 16 bits are used to represent the numeric value, and a sign bit is absent. 因此,可以编写代码,在此代码中,如果有符号整数值超出 UInt16 数据类型的范围,则会将其转换为 UInt16 值,而不会引发异常。As a result, it is possible to write code in which a signed integer value that is out of the range of the UInt16 data type is converted to a UInt16 value without the method throwing an exception. 下面的示例将 Int16.MinValue 转换为其十六进制字符串表示形式,然后调用 ToUInt16(String, Int32) 方法。The following example converts Int16.MinValue to its hexadecimal string representation, and then calls the ToUInt16(String, Int32) method. 方法会显示消息 "0x8000 转换为 32768",而不是引发异常。Instead of throwing an exception, the method displays the message, "0x8000 converts to 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.
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   

执行二元运算或数值转换时,开发人员始终负责验证方法或运算符是否使用适当的数值表示形式来解释特定值。When performing binary operations or numeric conversions, it is always the responsibility of the developer to verify that a method or operator is using the appropriate numeric representation to interpret a particular value. 下面的示例演示了一种方法,用于确保在将十六进制字符串转换为 UInt16 值时,方法不会将二进制表示形式不正确地用于解释使用两个补数表示形式的值。The following example illustrates one technique for ensuring that the method does not inappropriately use binary representation to interpret a value that uses two's complement representation when converting a hexadecimal string to a UInt16 value. 该示例在将值转换为其字符串表示形式时,确定某个值是否表示有符号或无符号整数。The example determines whether a value represents a signed or an unsigned integer while it is converting that value to its string representation. 当示例将值转换为 UInt16 值时,它会检查原始值是否为有符号整数。When the example converts the value to a UInt16 value, it checks whether the original value was a signed integer. 如果是这样,且设置了其高序位(表示原始值为负),该方法将引发异常。If so, and if its high-order bit is set (which indicates that the original value was negative), the method throws an exception.

// 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.
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.     

ToUInt16(Object, IFormatProvider)

重要

此 API 不符合 CLS。

使用指定的区域性特定格式信息,将指定对象的值转换为 16 位无符号整数。Converts the value of the specified object to a 16-bit unsigned integer, using the specified culture-specific formatting information.

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

参数

value
Object

一个实现 IConvertible 接口的对象。An object that implements the IConvertible interface.

provider
IFormatProvider

一个提供区域性特定的格式设置信息的对象。An object that supplies culture-specific formatting information.

返回

一个与 value 等效的 16 位无符号整数,如果 valuenull,则为零。A 16-bit unsigned integer that is equivalent to value, or zero if value is null.

属性

异常

value 的格式不正确。value is not in an appropriate format.

value 不实现 IConvertible 接口。value does not implement the IConvertible interface.

- 或 --or- 不支持转换。The conversion is not supported.

value 表示一个小于 MinValue 或大于 MaxValue 的数字。value represents a number that is less than MinValue or greater than MaxValue.

示例

下面的示例定义了一个 HexString 类,该类实现 IConvertible 接口,并设计用于保存16位有符号和16位无符号值的字符串表示形式。The following example defines a HexString class that implements the IConvertible interface and that is designed to hold the string representation of both 16-bit signed and 16-bit unsigned values. 类包含一个 Sign 属性,该属性指示其十六进制值的符号。The class includes a Sign property that indicates the sign of its hexadecimal value.

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);
   }
}
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

下面的示例演示对作为参数传递 HexString 对象的 ToUInt16(Object, IFormatProvider) 方法的调用,进而调用 HexString 类的 IConvertible.ToUInt16 实现。The following example shows that a call to the ToUInt16(Object, IFormatProvider) method that passes a HexString object as a parameter, in turn, calls the IConvertible.ToUInt16 implementation of the HexString class.

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.
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.

注解

返回值是调用的基础类型 valueIConvertible.ToUInt16 方法的结果。The return value is the result of invoking the IConvertible.ToUInt16 method of the underlying type of value.

provider 使用户能够指定与 value内容有关的区域性特定的转换信息。provider enables the user to specify culture-specific conversion information about the contents of value. 例如,如果 value 是表示数字的 String,则 provider 可能会提供有关用于表示该数字的表示法的特定于区域性的信息。For example, if value is a String that represents a number, provider could supply culture-specific information about the notation used to represent that number.

基类型忽略 provider;但是,如果 value 是实现 IConvertible 接口的用户定义类型,则可以使用参数。The base types ignore provider; however, the parameter may be used if value is a user-defined type that implements the IConvertible interface.

ToUInt16(String, IFormatProvider)

重要

此 API 不符合 CLS。

使用指定的区域性特定格式设置信息,将数字的指定字符串表示形式转换为等效的 16 位无符号整数。Converts the specified string representation of a number to an equivalent 16-bit unsigned integer, using the specified culture-specific formatting information.

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

参数

value
String

包含要转换的数字的字符串。A string that contains the number to convert.

provider
IFormatProvider

一个提供区域性特定的格式设置信息的对象。An object that supplies culture-specific formatting information.

返回

一个与 value 中数字等效的 16 位无符号整数,如果 valuenull,则为 0(零)。A 16-bit unsigned integer that is equivalent to the number in value, or 0 (zero) if value is null.

属性

异常

value 不由一个可选符号后跟一系列数字 (0-9) 组成。value does not consist of an optional sign followed by a sequence of digits (0 through 9).

value 表示一个小于 MinValue 或大于 MaxValue 的数字。value represents a number that is less than MinValue or greater than MaxValue.

示例

下面的示例定义了一个自定义 NumberFormatInfo 对象,该对象将字符串 "pos" 识别为正号,将字符串 "neg" 识别为负号。The following example defines a custom NumberFormatInfo object that recognizes the string "pos" as the positive sign and the string "neg" as the negative sign. 然后,它会使用此提供程序和固定区域性的 NumberFormatInfo 提供程序尝试将数值字符串数组的每个元素转换为整数。It then attempts to convert each element of a numeric string array to an integer using both this provider and the NumberFormatInfo provider for the invariant culture.

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
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

注解

返回值是对 value调用 UInt16.Parse 的结果。The return value is the result of invoking UInt16.Parse on value.

provider 是获取 NumberFormatInfo 对象的 IFormatProvider 实例。provider is an IFormatProvider instance that obtains a NumberFormatInfo object. NumberFormatInfo 对象提供有关 value格式的区域性特定信息。The NumberFormatInfo object provides culture-specific information about the format of value. 如果 null``provider,则使用当前区域性的 NumberFormatInfoIf provider is null, the NumberFormatInfo for the current culture is used.

如果你不希望在转换失败时处理异常,则可以改为调用 UInt16.TryParse 方法。If you prefer not to handle an exception if the conversion fails, you can call the UInt16.TryParse method instead. 它将返回一个 Boolean 值,该值指示转换是成功还是失败。It returns a Boolean value that indicates whether the conversion succeeded or failed.

ToUInt16(Single)

重要

此 API 不符合 CLS。

将指定的单精度浮点数的值转换为等效的 16 位无符号整数。Converts the value of the specified single-precision floating-point number to an equivalent 16-bit unsigned integer.

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

参数

value
Single

要转换的单精度浮点数。The single-precision floating-point number to convert.

返回

value,舍入为最接近的 16 位无符号整数。value, rounded to the nearest 16-bit unsigned integer. 如果 value 为两个整数中间的数字,则返回二者中的偶数;即 4.5 转换为 4,而 5.5 转换为 6。If value is halfway between two whole numbers, the even number is returned; that is, 4.5 is converted to 4, and 5.5 is converted to 6.

属性

异常

value 小于零或大于 MaxValuevalue is less than zero or greater than MaxValue.

示例

下面的示例将 String 值数组中的每个元素转换为16位无符号整数。The following example converts each element in an array of String values to an unsigned 16-bit integer.

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.
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.

另请参阅

ToUInt16(UInt64)

重要

此 API 不符合 CLS。

将指定的 64 位无符号整数的值转换为等效的 16 位无符号整数。Converts the value of the specified 64-bit unsigned integer to an equivalent 16-bit unsigned integer.

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

参数

value
UInt64

要转换的 64 位无符号整数。The 64-bit unsigned integer to convert.

返回

一个与 value 等效的 16 位无符号整数。A 16-bit unsigned integer that is equivalent to value.

属性

异常

value 大于 MaxValuevalue is greater than MaxValue.

示例

下面的示例尝试将无符号长整数数组中的每个元素转换为16位无符号整数。The following example attempts to convert each element in an array of unsigned long integers to an unsigned 16-bit integer.

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.
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.

ToUInt16(SByte)

重要

此 API 不符合 CLS。

将指定的 8 位有符号整数的值转换为等效的 16 位无符号整数。Converts the value of the specified 8-bit signed integer to the equivalent 16-bit unsigned integer.

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

参数

value
SByte

要转换的 8 位带符号整数。The 8-bit signed integer to convert.

返回

一个与 value 等效的 16 位无符号整数。A 16-bit unsigned integer that is equivalent to value.

属性

异常

value 小于零。value is less than zero.

示例

下面的示例将有符号字节数组中的每个元素转换为16位无符号整数。The following example converts each element in a signed byte array to an unsigned 16-bit integer.

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.
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.

ToUInt16(Double)

重要

此 API 不符合 CLS。

将指定的双精度浮点数的值转换为等效的 16 位无符号整数。Converts the value of the specified double-precision floating-point number to an equivalent 16-bit unsigned integer.

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

参数

value
Double

要转换的双精度浮点数。The double-precision floating-point number to convert.

返回

value,舍入为最接近的 16 位无符号整数。value, rounded to the nearest 16-bit unsigned integer. 如果 value 为两个整数中间的数字,则返回二者中的偶数;即 4.5 转换为 4,而 5.5 转换为 6。If value is halfway between two whole numbers, the even number is returned; that is, 4.5 is converted to 4, and 5.5 is converted to 6.

属性

异常

value 小于零或大于 MaxValuevalue is less than zero or greater than MaxValue.

示例

下面的示例将 Double 值数组中的每个元素转换为16位无符号整数。The following example converts each element in an array of Double values to an unsigned 16-bit integer.

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.
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.

另请参阅

ToUInt16(Int64)

重要

此 API 不符合 CLS。

将指定的 64 位有符号整数的值转换为等效的 16 位无符号整数。Converts the value of the specified 64-bit signed integer to an equivalent 16-bit unsigned integer.

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

参数

value
Int64

要转换的 64 位带符号整数。The 64-bit signed integer to convert.

返回

一个与 value 等效的 16 位无符号整数。A 16-bit unsigned integer that is equivalent to value.

属性

异常

value 小于零或大于 MaxValuevalue is less than zero or greater than MaxValue.

示例

下面的示例将长整数数组中的每个元素转换为16位无符号整数。The following example converts each element in a long integer array to an unsigned 16-bit integer.

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.
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.

ToUInt16(Object)

重要

此 API 不符合 CLS。

将指定对象的值转换为 16 位无符号整数。Converts the value of the specified object to a 16-bit unsigned integer.

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

参数

value
Object

用于实现 IConvertible 接口的对象,或为 nullAn object that implements the IConvertible interface, or null.

返回

一个与 value 等效的 16 位无符号整数,如果 valuenull,则为零。A 16-bit unsigned integer that is equivalent to value, or zero if value is null.

属性

异常

value 的格式不正确。value is not in an appropriate format.

value 不实现 IConvertible 接口。value does not implement the IConvertible interface.

- 或 --or- 不支持转换。The conversion is not supported.

value 表示一个小于 MinValue 或大于 MaxValue 的数字。value represents a number that is less than MinValue or greater than MaxValue.

示例

下面的示例尝试将对象数组中的每个元素转换为16位无符号整数。The following example attempts to convert each element in an object array to an unsigned 16-bit integer.

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.
   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.

注解

返回值是调用的基础类型 valueIConvertible.ToUInt16 方法的结果。The return value is the result of invoking the IConvertible.ToUInt16 method of the underlying type of value.

ToUInt16(Byte)

重要

此 API 不符合 CLS。

将指定的 8 位无符号整数的值转换为等效的 16 位无符号整数。Converts the value of the specified 8-bit unsigned integer to the equivalent 16-bit unsigned integer.

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

参数

value
Byte

要转换的 8 位无符号整数。The 8-bit unsigned integer to convert.

返回

一个与 value 等效的 16 位无符号整数。A 16-bit unsigned integer that is equivalent to value.

属性

示例

下面的示例将字节数组中的每个元素转换为16位无符号整数。The following example converts each element in a byte array to an unsigned 16-bit integer.

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.
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.

ToUInt16(Char)

重要

此 API 不符合 CLS。

将指定 Unicode 字符的值转换为等效的 16 位无符号整数。Converts the value of the specified Unicode character to the equivalent 16-bit unsigned integer.

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

参数

value
Char

要转换的 Unicode 字符。The Unicode character to convert.

返回

value 等效的 16 位无符号整数。The 16-bit unsigned integer equivalent to value.

属性

示例

下面的示例将字符数组中的每个元素转换为16位无符号整数。The following example converts each element in a character array to an unsigned 16-bit integer.

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.
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.

ToUInt16(DateTime)

重要

此 API 不符合 CLS。

调用此方法始终引发 InvalidCastExceptionCalling this method always throws InvalidCastException.

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

参数

value
DateTime

要转换的日期和时间值。The date and time value to convert.

返回

不支持此转换。This conversion is not supported. 不返回任何值。No value is returned.

属性

异常

不支持此转换。This conversion is not supported.

ToUInt16(Boolean)

重要

此 API 不符合 CLS。

将指定的布尔值转换为等效的 16 位无符号整数。Converts the specified Boolean value to the equivalent 16-bit unsigned integer.

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

参数

value
Boolean

要转换的布尔值。The Boolean value to convert.

返回

如果 valuetrue,则为数字 1;否则,为 0。The number 1 if value is true; otherwise, 0.

属性

示例

下面的示例将 truefalse 的布尔值转换为16位无符号整数。The following example converts the Boolean values true and false to unsigned 16-bit integers.

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.
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.

ToUInt16(Int16)

重要

此 API 不符合 CLS。

将指定的 16 位有符号整数的值转换为等效的 16 位无符号整数。Converts the value of the specified 16-bit signed integer to the equivalent 16-bit unsigned integer.

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

参数

value
Int16

要转换的 16 位带符号整数。The 16-bit signed integer to convert.

返回

一个与 value 等效的 16 位无符号整数。A 16-bit unsigned integer that is equivalent to value.

属性

异常

value 小于零。value is less than zero.

示例

下面的示例尝试将16位整数数组中的每个元素转换为16位无符号整数。The following example attempts to convert each element in a 16-bit integer array to an unsigned 16-bit integer.

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.
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.

ToUInt16(Int32)

重要

此 API 不符合 CLS。

将指定的 32 位有符号整数的值转换为等效的 16 位无符号整数。Converts the value of the specified 32-bit signed integer to an equivalent 16-bit unsigned integer.

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

参数

value
Int32

要转换的 32 位带符号整数。The 32-bit signed integer to convert.

返回

一个与 value 等效的 16 位无符号整数。A 16-bit unsigned integer that is equivalent to value.

属性

异常

value 小于零或大于 MaxValuevalue is less than zero or greater than MaxValue.

示例

下面的示例将整数数组中的每个元素转换为16位无符号整数。The following example converts each element in an integer array to an unsigned 16-bit integer.

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.
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.

ToUInt16(Decimal)

重要

此 API 不符合 CLS。

将指定的十进制数的值转换为等效的 16 位无符号整数。Converts the value of the specified decimal number to an equivalent 16-bit unsigned integer.

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

参数

value
Decimal

要转换的十进制数。The decimal number to convert.

返回

value,舍入为最接近的 16 位无符号整数。value, rounded to the nearest 16-bit unsigned integer. 如果 value 为两个整数中间的数字,则返回二者中的偶数;即 4.5 转换为 4,而 5.5 转换为 6。If value is halfway between two whole numbers, the even number is returned; that is, 4.5 is converted to 4, and 5.5 is converted to 6.

属性

异常

value 小于零或大于 MaxValuevalue is less than zero or greater than MaxValue.

示例

下面的示例将 Decimal 值数组中的每个元素转换为16位无符号整数。The following example converts each element in an array of Decimal values to an unsigned 16-bit integer.

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.
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.

另请参阅

适用于