Char.GetNumericValue Char.GetNumericValue Char.GetNumericValue Char.GetNumericValue Method

Definición

Convierte un carácter Unicode numérico especificado en un número de punto flotante de precisión doble.Converts a specified numeric Unicode character to a double-precision floating-point number.

Sobrecargas

GetNumericValue(String, Int32) GetNumericValue(String, Int32) GetNumericValue(String, Int32) GetNumericValue(String, Int32)

Convierte el carácter Unicode numérico situado en la posición especificada de una cadena especificada en un número de punto flotante de precisión doble.Converts the numeric Unicode character at the specified position in a specified string to a double-precision floating point number.

GetNumericValue(Char) GetNumericValue(Char) GetNumericValue(Char) GetNumericValue(Char)

Convierte el carácter Unicode numérico especificado en un número de punto flotante de precisión doble.Converts the specified numeric Unicode character to a double-precision floating point number.

GetNumericValue(String, Int32) GetNumericValue(String, Int32) GetNumericValue(String, Int32) GetNumericValue(String, Int32)

Convierte el carácter Unicode numérico situado en la posición especificada de una cadena especificada en un número de punto flotante de precisión doble.Converts the numeric Unicode character at the specified position in a specified string to a double-precision floating point number.

public:
 static double GetNumericValue(System::String ^ s, int index);
public static double GetNumericValue (string s, int index);
static member GetNumericValue : string * int -> double
Public Shared Function GetNumericValue (s As String, index As Integer) As Double

Parámetros

index
Int32 Int32 Int32 Int32

Posición de caracteres en s.The character position in s.

Devoluciones

Valor numérico del carácter que ocupa la posición index en s si dicho carácter representa un número; en caso contrario, -1.The numeric value of the character at position index in s if that character represents a number; otherwise, -1.

Excepciones

index es menor que cero o mayor que la última posición en s.index is less than zero or greater than the last position in s.

Ejemplos

En el siguiente ejemplo de GetNumericValuecódigo se muestra.The following code example demonstrates GetNumericValue.

using namespace System;
int main()
{
   String^ str =  "input: 1";
   Console::WriteLine( Char::GetNumericValue( '8' ) ); // Output: "8"
   Console::WriteLine( Char::GetNumericValue( str, 7 ) ); // Output: "1"
}

using System;

public class GetNumericValueSample {
	public static void Main() {
		string str = "input: 1";

		Console.WriteLine(Char.GetNumericValue('8'));		// Output: "8"
		Console.WriteLine(Char.GetNumericValue(str, 7));	// Output: "1"
	}
}
Module GetNumericValueSample
    Sub Main()
        Dim str As String
        str = "input: 1"

        Console.WriteLine(Char.GetNumericValue("8"c))       ' Output: "8"
        Console.WriteLine(Char.GetNumericValue(str, 7))     ' Output: "1"
    End Sub
End Module

Comentarios

El s parámetro debe ser la representación de cadena de un valor numérico.The s parameter must be the string representation of a numeric value. Por ejemplo, si el carácter que ocupa index la s posición en es "5", el valor devuelto es 5.For example, if the character at position index in s is "5", the return value is 5. Sin embargo, si el carácter que index ocupa s la posición en es "z", el valor devuelto es-1.However, if the character at position index in s is "z", the return value is -1.

Las posiciones de caracteres de una cadena se indizan empezando desde cero.Character positions in a string are indexed starting from zero.

Un carácter tiene un valor numérico asociado si y solo si es miembro de una UnicodeCategory de las siguientes categorías: DecimalDigitNumber, LetterNumbero OtherNumber.A character has an associated numeric value if and only if it is a member of one of the following UnicodeCategory categories: DecimalDigitNumber, LetterNumber, or OtherNumber.

Si el Char objeto situado en index la posición es el primer carácter de un par suplente válido GetNumericValue(String, Int32) , el método determina si el par suplente forma un dígito numérico.If the Char object at position index is the first character of a valid surrogate pair, the GetNumericValue(String, Int32) method determines whether the surrogate pair forms a numeric digit. Por ejemplo, el sistema de numeración Egeo se compone de puntos de código U + 10107 a U + 10133.For example, the Aegean numbering system consists of code points U+10107 through U+10133. En el ejemplo siguiente se ConvertFromUtf32 usa el método para crear una instancia de una cadena que representa cada número Egeo.The following example uses the ConvertFromUtf32 method to instantiate a string that represents each Aegean number. Como se muestra en la salida del ejemplo, GetNumericValue(String, Int32) el método devuelve el valor numérico correcto si se pasa el suplente alto de un número Egeo.As the output from the example shows, the GetNumericValue(String, Int32) method returns the correct numeric value if it is passed the high surrogate of an Aegean number. Sin embargo, si se pasa el suplente bajo, solo tiene en cuenta el suplente bajo en el aislamiento y devuelve-1.However, if it is passed the low surrogate, it considers only the low surrogate in isolation and returns -1.

// Define a UTF32 value for each character in the 
// Aegean numbering system.
for (int utf32 = 0x10107; utf32 <= 0x10133; utf32++) {
   string surrogate = Char.ConvertFromUtf32(utf32);
   for (int ctr = 0; ctr < surrogate.Length; ctr++) 
      Console.Write("U+{0:X4} at position {1}: {2}     ", 
                        Convert.ToUInt16(surrogate[ctr]), ctr,  
                        Char.GetNumericValue(surrogate, ctr));

   Console.WriteLine();
}    
// The example displays the following output:
//       U+D800 at position 0: 1     U+DD07 at position 1: -1
//       U+D800 at position 0: 2     U+DD08 at position 1: -1
//       U+D800 at position 0: 3     U+DD09 at position 1: -1
//       U+D800 at position 0: 4     U+DD0A at position 1: -1
//       U+D800 at position 0: 5     U+DD0B at position 1: -1
//       U+D800 at position 0: 6     U+DD0C at position 1: -1
//       U+D800 at position 0: 7     U+DD0D at position 1: -1
//       U+D800 at position 0: 8     U+DD0E at position 1: -1
//       U+D800 at position 0: 9     U+DD0F at position 1: -1
//       U+D800 at position 0: 10     U+DD10 at position 1: -1
//       U+D800 at position 0: 20     U+DD11 at position 1: -1
//       U+D800 at position 0: 30     U+DD12 at position 1: -1
//       U+D800 at position 0: 40     U+DD13 at position 1: -1
//       U+D800 at position 0: 50     U+DD14 at position 1: -1
//       U+D800 at position 0: 60     U+DD15 at position 1: -1
//       U+D800 at position 0: 70     U+DD16 at position 1: -1
//       U+D800 at position 0: 80     U+DD17 at position 1: -1
//       U+D800 at position 0: 90     U+DD18 at position 1: -1
//       U+D800 at position 0: 100     U+DD19 at position 1: -1
//       U+D800 at position 0: 200     U+DD1A at position 1: -1
//       U+D800 at position 0: 300     U+DD1B at position 1: -1
//       U+D800 at position 0: 400     U+DD1C at position 1: -1
//       U+D800 at position 0: 500     U+DD1D at position 1: -1
//       U+D800 at position 0: 600     U+DD1E at position 1: -1
//       U+D800 at position 0: 700     U+DD1F at position 1: -1
//       U+D800 at position 0: 800     U+DD20 at position 1: -1
//       U+D800 at position 0: 900     U+DD21 at position 1: -1
//       U+D800 at position 0: 1000     U+DD22 at position 1: -1
//       U+D800 at position 0: 2000     U+DD23 at position 1: -1
//       U+D800 at position 0: 3000     U+DD24 at position 1: -1
//       U+D800 at position 0: 4000     U+DD25 at position 1: -1
//       U+D800 at position 0: 5000     U+DD26 at position 1: -1
//       U+D800 at position 0: 6000     U+DD27 at position 1: -1
//       U+D800 at position 0: 7000     U+DD28 at position 1: -1
//       U+D800 at position 0: 8000     U+DD29 at position 1: -1
//       U+D800 at position 0: 9000     U+DD2A at position 1: -1
//       U+D800 at position 0: 10000     U+DD2B at position 1: -1
//       U+D800 at position 0: 20000     U+DD2C at position 1: -1
//       U+D800 at position 0: 30000     U+DD2D at position 1: -1
//       U+D800 at position 0: 40000     U+DD2E at position 1: -1
//       U+D800 at position 0: 50000     U+DD2F at position 1: -1
//       U+D800 at position 0: 60000     U+DD30 at position 1: -1
//       U+D800 at position 0: 70000     U+DD31 at position 1: -1
//       U+D800 at position 0: 80000     U+DD32 at position 1: -1
//       U+D800 at position 0: 90000     U+DD33 at position 1: -1
' Define a UTF32 value for each character in the 
' Aegean numbering system.
For utf32 As Integer = &h10107 To &h10133
   Dim surrogate As String = Char.ConvertFromUtf32(utf32)
   For ctr As Integer = 0 To surrogate.Length - 1
      Console.Write("U+{0:X4} at position {1}: {2}     ", 
                        Convert.ToUInt16(surrogate(ctr)), ctr,  
                        Char.GetNumericValue(surrogate, ctr))
   Next
   Console.WriteLine()
Next    
' The example displays the following output:
'       U+D800 at position 0: 1     U+DD07 at position 1: -1
'       U+D800 at position 0: 2     U+DD08 at position 1: -1
'       U+D800 at position 0: 3     U+DD09 at position 1: -1
'       U+D800 at position 0: 4     U+DD0A at position 1: -1
'       U+D800 at position 0: 5     U+DD0B at position 1: -1
'       U+D800 at position 0: 6     U+DD0C at position 1: -1
'       U+D800 at position 0: 7     U+DD0D at position 1: -1
'       U+D800 at position 0: 8     U+DD0E at position 1: -1
'       U+D800 at position 0: 9     U+DD0F at position 1: -1
'       U+D800 at position 0: 10     U+DD10 at position 1: -1
'       U+D800 at position 0: 20     U+DD11 at position 1: -1
'       U+D800 at position 0: 30     U+DD12 at position 1: -1
'       U+D800 at position 0: 40     U+DD13 at position 1: -1
'       U+D800 at position 0: 50     U+DD14 at position 1: -1
'       U+D800 at position 0: 60     U+DD15 at position 1: -1
'       U+D800 at position 0: 70     U+DD16 at position 1: -1
'       U+D800 at position 0: 80     U+DD17 at position 1: -1
'       U+D800 at position 0: 90     U+DD18 at position 1: -1
'       U+D800 at position 0: 100     U+DD19 at position 1: -1
'       U+D800 at position 0: 200     U+DD1A at position 1: -1
'       U+D800 at position 0: 300     U+DD1B at position 1: -1
'       U+D800 at position 0: 400     U+DD1C at position 1: -1
'       U+D800 at position 0: 500     U+DD1D at position 1: -1
'       U+D800 at position 0: 600     U+DD1E at position 1: -1
'       U+D800 at position 0: 700     U+DD1F at position 1: -1
'       U+D800 at position 0: 800     U+DD20 at position 1: -1
'       U+D800 at position 0: 900     U+DD21 at position 1: -1
'       U+D800 at position 0: 1000     U+DD22 at position 1: -1
'       U+D800 at position 0: 2000     U+DD23 at position 1: -1
'       U+D800 at position 0: 3000     U+DD24 at position 1: -1
'       U+D800 at position 0: 4000     U+DD25 at position 1: -1
'       U+D800 at position 0: 5000     U+DD26 at position 1: -1
'       U+D800 at position 0: 6000     U+DD27 at position 1: -1
'       U+D800 at position 0: 7000     U+DD28 at position 1: -1
'       U+D800 at position 0: 8000     U+DD29 at position 1: -1
'       U+D800 at position 0: 9000     U+DD2A at position 1: -1
'       U+D800 at position 0: 10000     U+DD2B at position 1: -1
'       U+D800 at position 0: 20000     U+DD2C at position 1: -1
'       U+D800 at position 0: 30000     U+DD2D at position 1: -1
'       U+D800 at position 0: 40000     U+DD2E at position 1: -1
'       U+D800 at position 0: 50000     U+DD2F at position 1: -1
'       U+D800 at position 0: 60000     U+DD30 at position 1: -1
'       U+D800 at position 0: 70000     U+DD31 at position 1: -1
'       U+D800 at position 0: 80000     U+DD32 at position 1: -1
'       U+D800 at position 0: 90000     U+DD33 at position 1: -1

GetNumericValue(Char) GetNumericValue(Char) GetNumericValue(Char) GetNumericValue(Char)

Convierte el carácter Unicode numérico especificado en un número de punto flotante de precisión doble.Converts the specified numeric Unicode character to a double-precision floating point number.

public:
 static double GetNumericValue(char c);
public static double GetNumericValue (char c);
static member GetNumericValue : char -> double
Public Shared Function GetNumericValue (c As Char) As Double

Parámetros

c
Char Char Char Char

Carácter Unicode que se va a convertir.The Unicode character to convert.

Devoluciones

Valor numérico de c si dicho carácter representa un número; en caso contrario, -1,0.The numeric value of c if that character represents a number; otherwise, -1.0.

Ejemplos

En el siguiente ejemplo GetNumericValuese muestra.The following example demonstrates GetNumericValue.

using namespace System;
int main()
{
   String^ str =  "input: 1";
   Console::WriteLine( Char::GetNumericValue( '8' ) ); // Output: "8"
   Console::WriteLine( Char::GetNumericValue( str, 7 ) ); // Output: "1"
}

using System;

public class GetNumericValueSample {
	public static void Main() {
		string str = "input: 1";

		Console.WriteLine(Char.GetNumericValue('8'));		// Output: "8"
		Console.WriteLine(Char.GetNumericValue(str, 7));	// Output: "1"
	}
}
Module GetNumericValueSample
    Sub Main()
        Dim str As String
        str = "input: 1"

        Console.WriteLine(Char.GetNumericValue("8"c))       ' Output: "8"
        Console.WriteLine(Char.GetNumericValue(str, 7))     ' Output: "1"
    End Sub
End Module

Comentarios

El c parámetro debe ser la Char representación de un valor numérico.The c parameter must be the Char representation of a numeric value. Por ejemplo, si c es "5", el valor devuelto es 5.For example, if c is "5", the return value is 5. Sin embargo, c si es "z", el valor devuelto es-1,0.However, if c is "z", the return value is -1.0.

Un carácter tiene un valor numérico asociado si y solo si es miembro de una UnicodeCategory de las siguientes categorías: DecimalDigitNumber, LetterNumbero OtherNumber.A character has an associated numeric value if and only if it is a member of one of the following UnicodeCategory categories: DecimalDigitNumber, LetterNumber, or OtherNumber.

El GetNumericValue método presupone que c corresponde a un carácter lingüístico único y comprueba si ese carácter se puede convertir en un dígito decimal.The GetNumericValue method assumes that c corresponds to a single linguistic character and checks whether that character can be converted to a decimal digit. Sin embargo, algunos números del estándar Unicode se representan mediante dos Char objetos que forman un par suplente.However, some numbers in the Unicode standard are represented by two Char objects that form a surrogate pair. Por ejemplo, el sistema de numeración Egeo se compone de puntos de código U + 10107 a U + 10133.For example, the Aegean numbering system consists of code points U+10107 through U+10133. En el ejemplo siguiente se ConvertFromUtf32 usa el método para crear una instancia de una cadena que representa el número de Egeo.The following example uses the ConvertFromUtf32 method to instantiate a string that represents AEGEAN NUMBER ONE. Como muestra la salida del ejemplo, el GetNumericValue(Char) método devuelve-1 si se pasa un suplente alto o un suplente bajo de este carácter.As the output from the example shows, the GetNumericValue(Char) method returns -1 if it is passed either a high surrogate or a low surrogate of this character.

int utf32 = 0x10107;       // AEGEAN NUMBER ONE
string surrogate = Char.ConvertFromUtf32(utf32);
foreach (var ch in surrogate)
   Console.WriteLine("U+{0:X4}: {1}    ", Convert.ToUInt16(ch), 
                                          Char.GetNumericValue(ch));

// The example displays the following output:
//       U+D800: -1
//       U+DD07: -1
Dim utf32 As Integer = &h10107       ' AEGEAN NUMBER ONE
Dim surrogate As String = Char.ConvertFromUtf32(utf32)
For Each ch In surrogate
   Console.WriteLine("U+{0:X4}: {1}    ", Convert.ToUInt16(ch), 
                                          Char.GetNumericValue(ch))
Next
' The example displays the following output:
'       U+D800: -1
'       U+DD07: -1

Se aplica a