BitConverter.ToDouble Yöntem

Tanım

Ad Alanı:
System
Bütünleştirilmiş Kod:
System.Runtime.dll
Bütünleştirilmiş Kodlar:
mscorlib.dll, netstandard.dll
Bütünleştirilmiş Kod:
System.Runtime.Extensions.dll
Bütünleştirilmiş Kod:
netstandard.dll
Bütünleştirilmiş Kod:
mscorlib.dll

Aşırı Yüklemeler

ToDouble(ReadOnlySpan<Byte>)

Salt okunurdur bir bayt yayılımını çift duyarlıklı kayan noktalı değere dönüştürür.Converts a read-only byte span into a double-precision floating-point value.
ToDouble(Byte[], Int32)

Bir bayt dizisindeki belirtilen konumdaki sekiz bayttan dönüştürülmüş bir çift duyarlıklı kayan noktalı sayı döndürür.Returns a double-precision floating point number converted from eight bytes at a specified position in a byte array.

ToDouble(ReadOnlySpan<Byte>)

Salt okunurdur bir bayt yayılımını çift duyarlıklı kayan noktalı değere dönüştürür.Converts a read-only byte span into a double-precision floating-point value.

public:
 static double ToDouble(ReadOnlySpan<System::Byte> value);
public static double ToDouble (ReadOnlySpan<byte> value);
static member ToDouble : ReadOnlySpan<byte> -> double
Public Shared Function ToDouble (value As ReadOnlySpan(Of Byte)) As Double

Parametreler

value
ReadOnlySpan<Byte>

Dönüştürülecek baytları içeren salt okunurdur.A read-only span containing the bytes to convert.

Döndürülenler

Double

Dönüştürülmüş baytları temsil eden çift duyarlıklı kayan nokta değeri.A double-precision floating-point value that represents the converted bytes.

Özel durumlar

ArgumentOutOfRangeException

Uzunluğu, value bir değerin uzunluğundan daha küçüktür Double .The length of value is less than the length of a Double value.

Şunlara uygulanır

ToDouble(Byte[], Int32)

Bir bayt dizisindeki belirtilen konumdaki sekiz bayttan dönüştürülmüş bir çift duyarlıklı kayan noktalı sayı döndürür.Returns a double-precision floating point number converted from eight bytes at a specified position in a byte array.

public:
 static double ToDouble(cli::array <System::Byte> ^ value, int startIndex);
public static double ToDouble (byte[] value, int startIndex);
static member ToDouble : byte[] * int -> double
Public Shared Function ToDouble (value As Byte(), startIndex As Integer) As Double

Parametreler

value
Byte[]

Bir bayt dizisi.An array of bytes.

startIndex
Int32

İçindeki başlangıç konumu value .The starting position within value.

Döndürülenler

Double

' Den başlayarak sekiz bayt tarafından oluşturulan çift duyarlıklı kayan nokta sayısı startIndex .A double precision floating point number formed by eight bytes beginning at startIndex.

Özel durumlar

ArgumentException

startIndex eksi 7 uzunluğuna eşit veya daha büyük value ve eksi 1 uzunluğuna eşit veya daha az value .startIndex is greater than or equal to the length of value minus 7, and is less than or equal to the length of value minus 1.

ArgumentNullException

value, null değeridir.value is null.

ArgumentOutOfRangeException

startIndex sıfırdan küçük veya value eksi 1 uzunluğundan büyük.startIndex is less than zero or greater than the length of value minus 1.

Örnekler

Aşağıdaki kod örneği, Byte dizi öğelerini Double , yöntemiyle değerlere dönüştürür ToDouble .The following code example converts elements of Byte arrays to Double values with the ToDouble method.

// Example of the BitConverter::ToDouble method.
using namespace System;

// Convert eight byte array elements to a double and display it.
void BAToDouble( array<unsigned char>^bytes, int index )
{
   double value = BitConverter::ToDouble( bytes, index );
   Console::WriteLine( "{0,5}{1,27}{2,27:E16}", index, BitConverter::ToString( bytes, index, 8 ), value );
}


// Display a byte array, using multiple lines if necessary.
void WriteMultiLineByteArray( array<unsigned char>^bytes )
{
   const int rowSize = 20;
   int iter;
   Console::WriteLine( "initial unsigned char array" );
   Console::WriteLine( "---------------------------" );
   for ( iter = 0; iter < bytes->Length - rowSize; iter += rowSize )
   {
      Console::Write( BitConverter::ToString( bytes, iter, rowSize ) );
      Console::WriteLine( "-" );

   }
   Console::WriteLine( BitConverter::ToString( bytes, iter ) );
   Console::WriteLine();
}

int main()
{
   array<unsigned char>^byteArray = {0,0,0,0,0,0,0,0,240,63,0,0,0,0,0,224,111,64,0,0,224,255,255,255,239,65,0,0,0,0,0,0,112,63,0,0,0,0,0,0,240,61,223,136,30,28,254,116,170,1,250,89,140,66,202,192,243,63,251,89,140,66,202,192,243,63,252,89,140,66,202,192,243,63,82,211,187,188,232,126,61,126,255,255,255,255,255,255,239,255,255,255,255,255,255,239,127,1,0,0,0,0,0,0,0,248,255,0,0,0,0,0,0,240,255,0,0,0,0,0,0,240,127};
   Console::WriteLine( "This example of the BitConverter::ToDouble( unsigned "
   "char[ ], int ) \nmethod generates the following output. It "
   "converts elements of a \nbyte array to double values.\n" );
   WriteMultiLineByteArray( byteArray );
   Console::WriteLine( "{0,5}{1,27}{2,27:E16}", "index", "array elements", "double" );
   Console::WriteLine( "{0,5}{1,27}{2,27:E16}", "-----", "--------------", "------" );
   
   // Convert byte array elements to double values.
   BAToDouble( byteArray, 0 );
   BAToDouble( byteArray, 2 );
   BAToDouble( byteArray, 10 );
   BAToDouble( byteArray, 18 );
   BAToDouble( byteArray, 26 );
   BAToDouble( byteArray, 34 );
   BAToDouble( byteArray, 42 );
   BAToDouble( byteArray, 50 );
   BAToDouble( byteArray, 58 );
   BAToDouble( byteArray, 66 );
   BAToDouble( byteArray, 74 );
   BAToDouble( byteArray, 82 );
   BAToDouble( byteArray, 89 );
   BAToDouble( byteArray, 97 );
   BAToDouble( byteArray, 99 );
   BAToDouble( byteArray, 107 );
   BAToDouble( byteArray, 115 );
}

/*
This example of the BitConverter.ToDouble( byte( ), int )
method generates the following output. It converts elements
of a byte array to double values.

initial byte array
------------------
00-00-00-00-00-00-00-00-F0-3F-00-00-00-00-00-E0-6F-40-00-00-
E0-FF-FF-FF-EF-41-00-00-00-00-00-00-70-3F-00-00-00-00-00-00-
F0-3D-DF-88-1E-1C-FE-74-AA-01-FA-59-8C-42-CA-C0-F3-3F-FB-59-
8C-42-CA-C0-F3-3F-FC-59-8C-42-CA-C0-F3-3F-52-D3-BB-BC-E8-7E-
3D-7E-FF-FF-FF-FF-FF-FF-EF-FF-FF-FF-FF-FF-FF-EF-7F-01-00-00-
00-00-00-00-00-F8-FF-00-00-00-00-00-00-F0-FF-00-00-00-00-00-
00-F0-7F

index             array elements                     double
-----             --------------                     ------
    0    00-00-00-00-00-00-00-00    0.0000000000000000E+000
    2    00-00-00-00-00-00-F0-3F    1.0000000000000000E+000
   10    00-00-00-00-00-E0-6F-40    2.5500000000000000E+002
   18    00-00-E0-FF-FF-FF-EF-41    4.2949672950000000E+009
   26    00-00-00-00-00-00-70-3F    3.9062500000000000E-003
   34    00-00-00-00-00-00-F0-3D    2.3283064365386963E-010
   42    DF-88-1E-1C-FE-74-AA-01    1.2345678901234500E-300
   50    FA-59-8C-42-CA-C0-F3-3F    1.2345678901234565E+000
   58    FB-59-8C-42-CA-C0-F3-3F    1.2345678901234567E+000
   66    FC-59-8C-42-CA-C0-F3-3F    1.2345678901234569E+000
   74    52-D3-BB-BC-E8-7E-3D-7E    1.2345678901234569E+300
   82    FF-FF-FF-FF-FF-FF-EF-FF   -1.7976931348623157E+308
   89    FF-FF-FF-FF-FF-FF-EF-7F    1.7976931348623157E+308
   97    01-00-00-00-00-00-00-00    4.9406564584124654E-324
   99    00-00-00-00-00-00-F8-FF                        NaN
  107    00-00-00-00-00-00-F0-FF                  -Infinity
  115    00-00-00-00-00-00-F0-7F                   Infinity
*/

// Example of the BitConverter.ToDouble method.
using System;

class BytesToDoubleDemo
{
    const string formatter = "{0,5}{1,27}{2,27:E16}";

    // Convert eight byte array elements to a double and display it.
    public static void BAToDouble( byte[ ] bytes, int index )
    {
        double value = BitConverter.ToDouble( bytes, index );

        Console.WriteLine( formatter, index,
            BitConverter.ToString( bytes, index, 8 ), value );
    }

    // Display a byte array, using multiple lines if necessary.
    public static void WriteMultiLineByteArray( byte[ ] bytes )
    {
        const int rowSize = 20;
        int iter;

        Console.WriteLine( "initial byte array" );
        Console.WriteLine( "------------------" );

        for( iter = 0; iter < bytes.Length - rowSize; iter += rowSize )
        {
            Console.Write(
                BitConverter.ToString( bytes, iter, rowSize ) );
            Console.WriteLine( "-" );
        }

        Console.WriteLine( BitConverter.ToString( bytes, iter ) );
        Console.WriteLine( );
    }

    public static void Main( )
    {
        byte[ ] byteArray = {
              0,   0,   0,   0,   0,   0,   0,   0, 240,  63,
              0,   0,   0,   0,   0, 224, 111,  64,   0,   0,
            224, 255, 255, 255, 239,  65,   0,   0,   0,   0,
              0,   0, 112,  63,   0,   0,   0,   0,   0,   0,
            240,  61, 223, 136,  30,  28, 254, 116, 170,   1,
            250,  89, 140,  66, 202, 192, 243,  63, 251,  89,
            140,  66, 202, 192, 243,  63, 252,  89, 140,  66,
            202, 192, 243,  63,  82, 211, 187, 188, 232, 126,
             61, 126, 255, 255, 255, 255, 255, 255, 239, 255,
            255, 255, 255, 255, 255, 239, 127,   1,   0,   0,
              0,   0,   0,   0,   0, 248, 255,   0,   0,   0,
              0,   0,   0, 240, 255,   0,   0,   0,   0,   0,
              0, 240, 127 };

        Console.WriteLine(
            "This example of the BitConverter.ToDouble( byte[ ], " +
            "int ) \nmethod generates the following output. It " +
            "converts elements \nof a byte array to double values.\n" );

        WriteMultiLineByteArray( byteArray );

        Console.WriteLine( formatter, "index", "array elements",
            "double" );
        Console.WriteLine( formatter, "-----", "--------------",
            "------" );

        // Convert byte array elements to double values.
        BAToDouble( byteArray, 0 );
        BAToDouble( byteArray, 2 );
        BAToDouble( byteArray, 10 );
        BAToDouble( byteArray, 18 );
        BAToDouble( byteArray, 26 );
        BAToDouble( byteArray, 34 );
        BAToDouble( byteArray, 42 );
        BAToDouble( byteArray, 50 );
        BAToDouble( byteArray, 58 );
        BAToDouble( byteArray, 66 );
        BAToDouble( byteArray, 74 );
        BAToDouble( byteArray, 82 );
        BAToDouble( byteArray, 89 );
        BAToDouble( byteArray, 97 );
        BAToDouble( byteArray, 99 );
        BAToDouble( byteArray, 107 );
        BAToDouble( byteArray, 115 );
    }
}

/*
This example of the BitConverter.ToDouble( byte[ ], int )
method generates the following output. It converts elements
of a byte array to double values.

initial byte array
------------------
00-00-00-00-00-00-00-00-F0-3F-00-00-00-00-00-E0-6F-40-00-00-
E0-FF-FF-FF-EF-41-00-00-00-00-00-00-70-3F-00-00-00-00-00-00-
F0-3D-DF-88-1E-1C-FE-74-AA-01-FA-59-8C-42-CA-C0-F3-3F-FB-59-
8C-42-CA-C0-F3-3F-FC-59-8C-42-CA-C0-F3-3F-52-D3-BB-BC-E8-7E-
3D-7E-FF-FF-FF-FF-FF-FF-EF-FF-FF-FF-FF-FF-FF-EF-7F-01-00-00-
00-00-00-00-00-F8-FF-00-00-00-00-00-00-F0-FF-00-00-00-00-00-
00-F0-7F

index             array elements                     double
-----             --------------                     ------
    0    00-00-00-00-00-00-00-00    0.0000000000000000E+000
    2    00-00-00-00-00-00-F0-3F    1.0000000000000000E+000
   10    00-00-00-00-00-E0-6F-40    2.5500000000000000E+002
   18    00-00-E0-FF-FF-FF-EF-41    4.2949672950000000E+009
   26    00-00-00-00-00-00-70-3F    3.9062500000000000E-003
   34    00-00-00-00-00-00-F0-3D    2.3283064365386963E-010
   42    DF-88-1E-1C-FE-74-AA-01    1.2345678901234500E-300
   50    FA-59-8C-42-CA-C0-F3-3F    1.2345678901234565E+000
   58    FB-59-8C-42-CA-C0-F3-3F    1.2345678901234567E+000
   66    FC-59-8C-42-CA-C0-F3-3F    1.2345678901234569E+000
   74    52-D3-BB-BC-E8-7E-3D-7E    1.2345678901234569E+300
   82    FF-FF-FF-FF-FF-FF-EF-FF   -1.7976931348623157E+308
   89    FF-FF-FF-FF-FF-FF-EF-7F    1.7976931348623157E+308
   97    01-00-00-00-00-00-00-00    4.9406564584124654E-324
   99    00-00-00-00-00-00-F8-FF                        NaN
  107    00-00-00-00-00-00-F0-FF                  -Infinity
  115    00-00-00-00-00-00-F0-7F                   Infinity
*/

' Example of the BitConverter.ToDouble method.
Module BytesToDoubleDemo

    Const formatter As String = "{0,5}{1,27}{2,27:E16}"
 
    ' Convert eight Byte array elements to a Double and display it.
    Sub BAToDouble( bytes( ) As Byte, index As Integer )

        Dim value As Double = BitConverter.ToDouble( bytes, index )

        Console.WriteLine( formatter, index, _
            BitConverter.ToString( bytes, index, 8 ), value )
    End Sub 

    ' Display a Byte array, using multiple lines if necessary.
    Sub WriteMultiLineByteArray( bytes( ) As Byte )
       
        Const rowSize As Integer = 20 
        Dim iter As Integer

        Console.WriteLine( "initial Byte array" )
        Console.WriteLine( "------------------" )

        For iter = 0 To bytes.Length - rowSize - 1 Step rowSize
            Console.Write( _
                BitConverter.ToString( bytes, iter, rowSize ) )
            Console.WriteLine( "-" )
        Next iter

        Console.WriteLine( BitConverter.ToString( bytes, iter ) )
        Console.WriteLine( )
    End Sub

    Sub Main( )
        Dim byteArray as Byte( ) = { _
              0,   0,   0,   0,   0,   0,   0,   0, 240,  63, _
              0,   0,   0,   0,   0, 224, 111,  64,   0,   0, _
            224, 255, 255, 255, 239,  65,   0,   0,   0,   0, _
              0,   0, 112,  63,   0,   0,   0,   0,   0,   0, _
            240,  61, 223, 136,  30,  28, 254, 116, 170,   1, _
            250,  89, 140,  66, 202, 192, 243,  63, 251,  89, _
            140,  66, 202, 192, 243,  63, 252,  89, 140,  66, _
            202, 192, 243,  63,  82, 211, 187, 188, 232, 126, _
             61, 126, 255, 255, 255, 255, 255, 255, 239, 255, _
            255, 255, 255, 255, 255, 239, 127,   1,   0,   0, _
              0,   0,   0,   0,   0, 248, 255,   0,   0,   0, _
              0,   0,   0, 240, 255,   0,   0,   0,   0,   0, _
              0, 240, 127 }

        Console.WriteLine( _
            "This example of the BitConverter.ToDouble( Byte( ), " & _
            "Integer ) " & vbCrLf & "method generates the " & _
            "following output. It converts elements " & vbCrLf & _
            "of a Byte array to Double values." & vbCrLf )

        WriteMultiLineByteArray( byteArray )

        Console.WriteLine( formatter, "index", "array elements", _
            "Double" )
        Console.WriteLine( formatter, "-----", "--------------", _
            "------" )
          
        ' Convert Byte array elements to Double values.
        BAToDouble( byteArray, 0 )
        BAToDouble( byteArray, 2 )
        BAToDouble( byteArray, 10 )
        BAToDouble( byteArray, 18 )
        BAToDouble( byteArray, 26 )
        BAToDouble( byteArray, 34 )
        BAToDouble( byteArray, 42 )
        BAToDouble( byteArray, 50 )
        BAToDouble( byteArray, 58 )
        BAToDouble( byteArray, 66 )
        BAToDouble( byteArray, 74 )
        BAToDouble( byteArray, 82 )
        BAToDouble( byteArray, 89 )
        BAToDouble( byteArray, 97 )
        BAToDouble( byteArray, 99 )
        BAToDouble( byteArray, 107 )
        BAToDouble( byteArray, 115 )
    End Sub 
End Module

' This example of the BitConverter.ToDouble( Byte( ), Integer )
' method generates the following output. It converts elements
' of a Byte array to Double values.
' 
' initial Byte array
' ------------------
' 00-00-00-00-00-00-00-00-F0-3F-00-00-00-00-00-E0-6F-40-00-00-
' E0-FF-FF-FF-EF-41-00-00-00-00-00-00-70-3F-00-00-00-00-00-00-
' F0-3D-DF-88-1E-1C-FE-74-AA-01-FA-59-8C-42-CA-C0-F3-3F-FB-59-
' 8C-42-CA-C0-F3-3F-FC-59-8C-42-CA-C0-F3-3F-52-D3-BB-BC-E8-7E-
' 3D-7E-FF-FF-FF-FF-FF-FF-EF-FF-FF-FF-FF-FF-FF-EF-7F-01-00-00-
' 00-00-00-00-00-F8-FF-00-00-00-00-00-00-F0-FF-00-00-00-00-00-
' 00-F0-7F
' 
' index             array elements                     Double
' -----             --------------                     ------
'     0    00-00-00-00-00-00-00-00    0.0000000000000000E+000
'     2    00-00-00-00-00-00-F0-3F    1.0000000000000000E+000
'    10    00-00-00-00-00-E0-6F-40    2.5500000000000000E+002
'    18    00-00-E0-FF-FF-FF-EF-41    4.2949672950000000E+009
'    26    00-00-00-00-00-00-70-3F    3.9062500000000000E-003
'    34    00-00-00-00-00-00-F0-3D    2.3283064365386963E-010
'    42    DF-88-1E-1C-FE-74-AA-01    1.2345678901234500E-300
'    50    FA-59-8C-42-CA-C0-F3-3F    1.2345678901234565E+000
'    58    FB-59-8C-42-CA-C0-F3-3F    1.2345678901234567E+000
'    66    FC-59-8C-42-CA-C0-F3-3F    1.2345678901234569E+000
'    74    52-D3-BB-BC-E8-7E-3D-7E    1.2345678901234569E+300
'    82    FF-FF-FF-FF-FF-FF-EF-FF   -1.7976931348623157E+308
'    89    FF-FF-FF-FF-FF-FF-EF-7F    1.7976931348623157E+308
'    97    01-00-00-00-00-00-00-00    4.9406564584124654E-324
'    99    00-00-00-00-00-00-F8-FF                        NaN
'   107    00-00-00-00-00-00-F0-FF                  -Infinity
'   115    00-00-00-00-00-00-F0-7F                   Infinity

Açıklamalar

ToDoubleYöntemi, dizindeki baytları startIndex startIndex + 7 Double değerine dönüştürür.The ToDouble method converts the bytes from index startIndex to startIndex + 7 to a Double value. Dizideki baytların sırası, bilgisayar sisteminin mimarisinin bitiğünü yansıtmalıdır; daha fazla bilgi için, sınıf konusunun açıklamalar bölümüne bakın BitConverter .The order of bytes in the array must reflect the endianness of the computer system's architecture; for more information, see the Remarks section of the BitConverter class topic.

Ayrıca bkz.

Şunlara uygulanır