BitConverter.txt

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20191113


BitConverter內含一系列 轉換 byte[] 的函數.
可直接呼叫 BitConverter.Get 或 .To 系列函數.

            The System.BitConverter class helps manipulate value types in their fundamental form, 
as a series of bytes. A byte is defined as an 8-bit unsigned integer. 
The BitConverter class includes static methods to 
convert each of the primitive types to and from an array of bytes, 
as the following table illustrates.

Type    To byte conversion        From byte conversion
------- ------------------------- --------------------
Boolean GetBytes(Boolean)         ToBoolean
Char    GetBytes(Char)            ToChar  ----> Unicode Char
Double  GetBytes(Double)          ToDouble
        -or-                      -or-
        DoubleToInt64Bits(Double) Int64BitsToDouble
Int16   GetBytes(Int16)           ToInt16
Int32   GetBytes(Int32)           ToInt32
Int64   GetBytes(Int64)           ToInt64
Single  GetBytes(Single)          ToSingle
UInt16  GetBytes(UInt16)          ToUInt16
UInt32  GetBytes(UInt32)          ToUInt32
UInt64  GetBytes(UInt64)          ToUInt64
                                  ToString
------- ------------------------- --------------------


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BitConverter.DoubleToInt64Bits

// Example of the BitConverter.DoubleToInt64Bits method.
using System;

class DoubleToInt64BitsDemo
{
    const string formatter = "{0,25:E16}{1,23:X16}";
 
    // Reinterpret the double argument as a long.
    public static void DoubleToLongBits( double argument )
    {
        long longValue;
        longValue = BitConverter.DoubleToInt64Bits( argument );

        // Display the resulting long in hexadecimal.
        Console.WriteLine( formatter, argument, longValue );
    }
       
    public static void Main( )
    {
        Console.WriteLine( 
            "This example of the BitConverter.DoubleToInt64Bits( " +
            "double ) \nmethod generates the following output.\n" );
        Console.WriteLine( formatter, "double argument", 
            "hexadecimal value" );
        Console.WriteLine( formatter, "---------------", 
            "-----------------" );
          
        // Convert double values and display the results.
        DoubleToLongBits( 1.0 );
        DoubleToLongBits( 15.0 );
        DoubleToLongBits( 255.0 );
        DoubleToLongBits( 4294967295.0 );
        DoubleToLongBits( 0.00390625 );
        DoubleToLongBits( 0.00000000023283064365386962890625 );
        DoubleToLongBits( 1.234567890123E-300 );
        DoubleToLongBits( 1.23456789012345E-150 );
        DoubleToLongBits( 1.2345678901234565 );
        DoubleToLongBits( 1.2345678901234567 );
        DoubleToLongBits( 1.2345678901234569 );
        DoubleToLongBits( 1.23456789012345678E+150 );
        DoubleToLongBits( 1.234567890123456789E+300 );
        DoubleToLongBits( double.MinValue );
        DoubleToLongBits( double.MaxValue );
        DoubleToLongBits( double.Epsilon );
        DoubleToLongBits( double.NaN );
        DoubleToLongBits( double.NegativeInfinity );
        DoubleToLongBits( double.PositiveInfinity );
    }
}

/*
This example of the BitConverter.DoubleToInt64Bits( double )
method generates the following output.

          double argument      hexadecimal value
          ---------------      -----------------
  1.0000000000000000E+000       3FF0000000000000
  1.5000000000000000E+001       402E000000000000
  2.5500000000000000E+002       406FE00000000000
  4.2949672950000000E+009       41EFFFFFFFE00000
  3.9062500000000000E-003       3F70000000000000
  2.3283064365386963E-010       3DF0000000000000
  1.2345678901230000E-300       01AA74FE1C1E7E45
  1.2345678901234500E-150       20D02A36586DB4BB
  1.2345678901234565E+000       3FF3C0CA428C59FA
  1.2345678901234567E+000       3FF3C0CA428C59FB
  1.2345678901234569E+000       3FF3C0CA428C59FC
  1.2345678901234569E+150       5F182344CD3CDF9F
  1.2345678901234569E+300       7E3D7EE8BCBBD352
 -1.7976931348623157E+308       FFEFFFFFFFFFFFFF
  1.7976931348623157E+308       7FEFFFFFFFFFFFFF
  4.9406564584124654E-324       0000000000000001
                      NaN       FFF8000000000000
                -Infinity       FFF0000000000000
                 Infinity       7FF0000000000000
*/