本篇文章主要介绍了"c#，关于Big Endian 和 Little Endian，以及转换类"，主要涉及到require,Exception方面的内容，对于C#jrs看球网直播吧_低调看直播体育app软件下载_低调看体育直播感兴趣的同学可以参考一下：
Big Endian：最高字节在地址最低位，最低字节在地址最高位，依次排列。 Little Endian：最低字节在最低位，最高字节在最高位，反序排列。当在本地...
Big Endian：最高字节在地址最低位，最低字节在地址最高位，依次排列。
Little Endian：最低字节在最低位，最高字节在最高位，反序排列。
当在本地主机上，无需注意机器用的是Big Endian还是Little Endian。但是网络上都是用的是Big Endian，需要进行一个转换，但是c#提供的BitConverter默认使用的Little Endian，在需与网络通信时，反的字节序大有不便，特此提供一个可选Big Endian和Little Endian类方便转换。
为什么存在Little Endian？因为对于机器来说，Little Endian更有利于机器的运算。内存地址由低位到高位，在两个数相加运算，直接在高位添加进位数，不必移动内存地址
第一部分
using System;
using System.Runtime.InteropServices;
namespace MiscUtil.Conversion
{
////// Equivalent of System.BitConverter, but with either endianness.
///publicabstractclass EndianBitConverter
{
#region Endianness of this converter
////// Indicates the byte order ("endianess") in which data is converted using this class.
///////// Different computer architectures store data using different byte orders. "Big-endian"
/// means the most significant byte is on the left end of a word. "Little-endian" means the
/// most significant byte is on the right end of a word.
//////true if this converter is little-endian, false otherwise.publicabstractbool IsLittleEndian();
////// Indicates the byte order ("endianess") in which data is converted using this class.
///publicabstract Endianness Endianness { get; }
#endregion#region Factory properties
static LittleEndianBitConverter little = new LittleEndianBitConverter();
////// Returns a little-endian bit converter instance. The same instance is
/// always returned.
///publicstatic LittleEndianBitConverter Little
{
get { return little; }
}
static BigEndianBitConverter big = new BigEndianBitConverter();
////// Returns a big-endian bit converter instance. The same instance is
/// always returned.
///publicstatic BigEndianBitConverter Big
{
get { return big; }
}
#endregion#region Double/primitive conversions
////// Converts the specified double-precision floating point number to a
/// 64-bit signed integer. Note: the endianness of this converter does not
/// affect the returned value.
//////The number to convert. ///A 64-bit signed integer whose value is equivalent to value.publiclong DoubleToInt64Bits(double value)
{
return BitConverter.DoubleToInt64Bits(value);
}
////// Converts the specified 64-bit signed integer to a double-precision
/// floating point number. Note: the endianness of this converter does not
/// affect the returned value.
//////The number to convert. ///A double-precision floating point number whose value is equivalent to value.publicdouble Int64BitsToDouble (long value)
{
return BitConverter.Int64BitsToDouble(value);
}
////// Converts the specified single-precision floating point number to a
/// 32-bit signed integer. Note: the endianness of this converter does not
/// affect the returned value.
//////The number to convert. ///A 32-bit signed integer whose value is equivalent to value.publicint SingleToInt32Bits(float value)
{
returnnew Int32SingleUnion(value).AsInt32;
}
////// Converts the specified 32-bit signed integer to a single-precision floating point
/// number. Note: the endianness of this converter does not
/// affect the returned value.
//////The number to convert. ///A single-precision floating point number whose value is equivalent to value.publicfloat Int32BitsToSingle (int value)
{
returnnew Int32SingleUnion(value).AsSingle;
}
#endregion#region To(PrimitiveType) conversions
////// Returns a Boolean value converted from one byte at a specified position in a byte array.
//////An array of bytes.///The starting position within value.///true if the byte at startIndex in value is nonzero; otherwise, false.publicbool ToBoolean (byte[] value, int startIndex)
{
CheckByteArgument(value, startIndex, 1);
return BitConverter.ToBoolean(value, startIndex);
}
////// Returns a Unicode character converted from two bytes at a specified position in a byte array.
//////An array of bytes.///The starting position within value.///A character formed by two bytes beginning at startIndex.publicchar ToChar (byte[] value, int startIndex)
{
returnunchecked((char) (CheckedFromBytes(value, startIndex, 2)));
}
////// Returns a double-precision floating point number converted from eight bytes
/// at a specified position in a byte array.
//////An array of bytes.///The starting position within value.///A double precision floating point number formed by eight bytes beginning at startIndex.publicdouble ToDouble (byte[] value, int startIndex)
{
return Int64BitsToDouble(ToInt64(value, startIndex));
}
////// Returns a single-precision floating point number converted from four bytes
/// at a specified position in a byte array.
//////An array of bytes.///The starting position within value.///A single precision floating point number formed by four bytes beginning at startIndex.publicfloat ToSingle (byte[] value, int startIndex)
{
return Int32BitsToSingle(ToInt32(value, startIndex));
}
////// Returns a 16-bit signed integer converted from two bytes at a specified position in a byte array.
//////An array of bytes.///The starting position within value.///A 16-bit signed integer formed by two bytes beginning at startIndex.publicshort ToInt16 (byte[] value, int startIndex)
{
returnunchecked((short) (CheckedFromBytes(value, startIndex, 2)));
}
////// Returns a 32-bit signed integer converted from four bytes at a specified position in a byte array.
//////An array of bytes.///The starting position within value.///A 32-bit signed integer formed by four bytes beginning at startIndex.publicint ToInt32 (byte[] value, int startIndex)
{
returnunchecked((int) (CheckedFromBytes(value, startIndex, 4)));
}
////// Returns a 64-bit signed integer converted from eight bytes at a specified position in a byte array.
//////An array of bytes.///The starting position within value.///A 64-bit signed integer formed by eight bytes beginning at startIndex.publiclong ToInt64 (byte[] value, int startIndex)
{
return CheckedFromBytes(value, startIndex, 8);
}
////// Returns a 16-bit unsigned integer converted from two bytes at a specified position in a byte array.
//////An array of bytes.///The starting position within value.///A 16-bit unsigned integer formed by two bytes beginning at startIndex.publicushort ToUInt16 (byte[] value, int startIndex)
{
returnunchecked((ushort) (CheckedFromBytes(value, startIndex, 2)));
}
////// Returns a 32-bit unsigned integer converted from four bytes at a specified position in a byte array.
//////An array of bytes.///The starting position within value.///A 32-bit unsigned integer formed by four bytes beginning at startIndex.publicuint ToUInt32 (byte[] value, int startIndex)
{
returnunchecked((uint) (CheckedFromBytes(value, startIndex, 4)));
}
////// Returns a 64-bit unsigned integer converted from eight bytes at a specified position in a byte array.
//////An array of bytes.///The starting position within value.///A 64-bit unsigned integer formed by eight bytes beginning at startIndex.publiculong ToUInt64 (byte[] value, int startIndex)
{
returnunchecked((ulong) (CheckedFromBytes(value, startIndex, 8)));
}
////// Checks the given argument for validity.
//////The byte array passed in///The start index passed in///The number of bytes required///<Exception cref="ArgumentNullException">value is a null referenceException>///<Exception cref="ArgumentOutOfRangeException">/// startIndex is less than zero or greater than the length of value minus bytesrequired.
///Exception>staticvoid CheckByteArgument(byte[] value, int startIndex, int bytesrequired)
{
if (value==null)
{
thrownew ArgumentNullException("value");
}
if (startIndex < 0 || startIndex > value.Length-bytesrequired)
{
thrownew ArgumentOutOfRangeException("startIndex");
}
}
////// Checks the arguments for validity before calling FromBytes
/// (which can therefore assume the arguments are valid).
//////The bytes to convert after checking///The index of the first byte to convert///The number of bytes to convert///long CheckedFromBytes(byte[] value, int startIndex, int bytesToConvert)
{
CheckByteArgument(value, startIndex, bytesToConvert);
return FromBytes(value, startIndex, bytesToConvert);
}
////// Convert the given number of bytes from the given array, from the given start
/// position, into a long, using the bytes as the least significant part of the long.
/// By the time this is called, the arguments have been checked for validity.
//////The bytes to convert///The index of the first byte to convert///The number of bytes to use in the conversion///The converted numberprotectedabstractlong FromBytes(byte[] value, int startIndex, int bytesToConvert);
#endregion#region ToString conversions
////// Returns a String converted from the elements of a byte array.
//////An array of bytes.///All the elements of value are converted.////// A String of hexadecimal pairs separated by hyphens, where each pair
/// represents the corresponding element in value; for example, "7F-2C-4A".
///publicstaticstring ToString(byte[] value)
{
return BitConverter.ToString(value);
}
////// Returns a String converted from the elements of a byte array starting at a specified array position.
//////An array of bytes.///The starting position within value.///The elements from array position startIndex to the end of the array are converted.////// A String of hexadecimal pairs separated by hyphens, where each pair
/// represents the corresponding element in value; for example, "7F-2C-4A".
///publicstaticstring ToString(byte[] value, int startIndex)
{
return BitConverter.ToString(value, startIndex);
}
////// Returns a String converted from a specified number of bytes at a specified position in a byte array.
//////An array of bytes.///The starting position within value.///The number of bytes to convert.///The length elements from array position startIndex are converted.////// A String of hexadecimal pairs separated by hyphens, where each pair
/// represents the corresponding element in value; for example, "7F-2C-4A".
///publicstaticstring ToString(byte[] value, int startIndex, int length)
{
return BitConverter.ToString(value, startIndex, length);
}
#endregion#region Decimal conversions
////// Returns a decimal value converted from sixteen bytes
/// at a specified position in a byte array.
//////An array of bytes.///The starting position within value.///A decimal formed by sixteen bytes beginning at startIndex.publicdecimal ToDecimal (byte[] value, int startIndex)
{
// HACK: This always assumes four parts, each in their own endianness,
// starting with the first part at the start of the byte array.
// On the other hand, there's no real format specified...int[] parts = newint[4];
for (int i=0; i < 4; i++)
{
parts[i] = ToInt32(value, startIndex+i*4);
}
returnnew Decimal(parts);
}
////// Returns the specified decimal value as an array of bytes.
//////The number to convert.///An array of bytes with length 16.publicbyte[] GetBytes(decimal value)
{
byte[] bytes = newbyte[16];
int[] parts = decimal.GetBits(value);
for (int i=0; i < 4; i++)
{
CopyBytesImpl(parts[i], 4, bytes, i*4);
}
return bytes;
}
////// Copies the specified decimal value into the specified byte array,
/// beginning at the specified index.
//////A character to convert.///The byte array to copy the bytes into///The first index into the array to copy the bytes intopublicvoid CopyBytes(decimal value, byte[] buffer, int index)
{
int[] parts = decimal.GetBits(value);
for (int i=0; i < 4; i++)
{
CopyBytesImpl(parts[i], 4, buffer, i*4+index);
}
}
#endregion#region GetBytes conversions
////// Returns an array with the given number of bytes formed
/// from the least significant bytes of the specified value.
/// This is used to implement the other GetBytes methods.
//////The value to get bytes for///The number of significant bytes to returnbyte[] GetBytes(long value, int bytes)
{
byte[] buffer = newbyte[bytes];
CopyBytes(value, bytes, buffer, 0);
return buffer;
}
////// Returns the specified Boolean value as an array of bytes.
//////A Boolean value.///An array of bytes with length 1.publicbyte[] GetBytes(bool value)
{
return BitConverter.GetBytes(value);
}
////// Returns the specified Unicode character value as an array of bytes.
//////A character to convert.///An array of bytes with length 2.publicbyte[] GetBytes(char value)
{
return GetBytes(value, 2);
}
////// Returns the specified double-precision floating point value as an array of bytes.
//////The number to convert.///An array of bytes with length 8.publicbyte[] GetBytes(double value)
{
return GetBytes(DoubleToInt64Bits(value), 8);
}
////// Returns the specified 16-bit signed integer value as an array of bytes.
//////The number to convert.///An array of bytes with length 2.publicbyte[] GetBytes(short value)
{
return GetBytes(value, 2);
}
////// Returns the specified 32-bit signed integer value as an array of bytes.
//////The number to convert.///An array of bytes with length 4.publicbyte[] GetBytes(int value)
{
return GetBytes(value, 4);
}
////// Returns the specified 64-bit signed integer value as an array of bytes.
//////The number to convert.///An array of bytes with length 8.publicbyte[] GetBytes(long value)
{
return GetBytes(value, 8);
}
////// Returns the specified single-precision floating point value as an array of bytes.
//////The number to convert.///An array of bytes with length 4.publicbyte[] GetBytes(float value)
{
return GetBytes(SingleToInt32Bits(value), 4);
}
////// Returns the specified 16-bit unsigned integer value as an array of bytes.
//////The number to convert.///An array of bytes with length 2.publicbyte[] GetBytes(ushort value)
{
return GetBytes(value, 2);
}
////// Returns the specified 32-bit unsigned integer value as an array of bytes.
//////The number to convert.///An array of bytes with length 4.publicbyte[] GetBytes(uint value)
{
return GetBytes(value, 4);
}
////// Returns the specified 64-bit unsigned integer value as an array of bytes.
//////The number to convert.///An array of bytes with length 8.publicbyte[] GetBytes(ulong value)
{
return GetBytes(unchecked((long)value), 8);
}
#endregion#region CopyBytes conversions
////// Copies the given number of bytes from the least-specific
/// end of the specified value into the specified byte array, beginning
/// at the specified index.
/// This is used to implement the other CopyBytes methods.
//////The value to copy bytes for///The number of significant bytes to copy///The byte array to copy the bytes into///The first index into the array to copy the bytes intovoid CopyBytes(long value, int bytes, byte[] buffer, int index)
{
if (buffer==null)
{
thrownew ArgumentNullException("buffer", "Byte array must not be null");
}
if (buffer.Length < index+bytes)
{
thrownew ArgumentOutOfRangeException("Buffer not big enough for value");
}
CopyBytesImpl(value, bytes, buffer, index);
}
////// Copies the given number of bytes from the least-specific
/// end of the specified value into the specified byte array, beginning
/// at the specified index.
/// This must be implemented in concrete derived classes, but the implementation
/// may assume that the value will fit into the buffer.
//////The value to copy bytes for///The number of significant bytes to copy///The byte array to copy the bytes into///The first index into the array to copy the bytes intoprotectedabstractvoid CopyBytesImpl(long value, int bytes, byte[] buffer, int index);
////// Copies the specified Boolean value into the specified byte array,
/// beginning at the specified index.
//////A Boolean value.///The byte array to copy the bytes into///The first index into the array to copy the bytes intopublicvoid CopyBytes(bool value, byte[] buffer, int index)
{
CopyBytes(value ? 1 : 0, 1, buffer, index);
}
////// Copies the specified Unicode character value into the specified byte array,
/// beginning at the specified index.
//////A character to convert.///The byte array to copy the bytes into///The first index into the array to copy the bytes intopublicvoid CopyBytes(char value, byte[] buffer, int index)
{
CopyBytes(value, 2, buffer, index);
}
////// Copies the specified double-precision floating point value into the specified byte array,
/// beginning at the specified index.
//////The number to convert.///The byte array to copy the bytes into///The first index into the array to copy the bytes intopublicvoid CopyBytes(double value, byte[] buffer, int index)
{
CopyBytes(DoubleToInt64Bits(value), 8, buffer, index);
}
////// Copies the specified 16-bit signed integer value into the specified byte array,
/// beginning at the specified index.
//////The number to convert.///The byte array to copy the bytes into///The first index into the array to copy the bytes intopublicvoid CopyBytes(short value, byte[] buffer, int index)
{
CopyBytes(value, 2, buffer, index);
}
////// Copies the specified 32-bit signed integer value into the specified byte array,
/// beginning at the specified index.
//////The number to convert.///The byte array to copy the bytes into///The first index into the array to copy the bytes intopublicvoid CopyBytes(int value, byte[] buffer, int index)
{
CopyBytes(value, 4, buffer, index);
}
////// Copies the specified 64-bit signed integer value into the specified byte array,
/// beginning at the specified index.
//////The number to convert.///The byte array to copy the bytes into///The first index into the array to copy the bytes intopublicvoid CopyBytes(long value, byte[] buffer, int index)
{
CopyBytes(value, 8, buffer, index);
}
////// Copies the specified single-precision floating point value into the specified byte array,
/// beginning at the specified index.
//////The number to convert.///The byte array to copy the bytes into///The first index into the array to copy the bytes intopublicvoid CopyBytes(float value, byte[] buffer, int index)
{
CopyBytes(SingleToInt32Bits(value), 4, buffer, index);
}
////// Copies the specified 16-bit unsigned integer value into the specified byte array,
/// beginning at the specified index.
//////The number to convert.///The byte array to copy the bytes into///The first index into the array to copy the bytes intopublicvoid CopyBytes(ushort value, byte[] buffer, int index)
{
CopyBytes(value, 2, buffer, index);
}
////// Copies the specified 32-bit unsigned integer value into the specified byte array,
/// beginning at the specified index.
//////The number to convert.///The byte array to copy the bytes into///The first index into the array to copy the bytes intopublicvoid CopyBytes(uint value, byte[] buffer, int index)
{
CopyBytes(value, 4, buffer, index);
}
////// Copies the specified 64-bit unsigned integer value into the specified byte array,
/// beginning at the specified index.
//////The number to convert.///The byte array to copy the bytes into///The first index into the array to copy the bytes intopublicvoid CopyBytes(ulong value, byte[] buffer, int index)
{
CopyBytes(unchecked((long)value), 8, buffer, index);
}
#endregion#region Private struct used for Single/Int32 conversions
////// Union used solely for the equivalent of DoubleToInt64Bits and vice versa.
/// [StructLayout(LayoutKind.Explicit)]
struct Int32SingleUnion
{
////// Int32 version of the value.
/// [FieldOffset(0)]
int i;
////// Single version of the value.
/// [FieldOffset(0)]
float f;
////// Creates an instance representing the given integer.
//////The integer value of the new instance.internal Int32SingleUnion(int i)
{
this.f = 0; // Just to keep the compiler happythis.i = i;
}
////// Creates an instance representing the given floating point number.
//////The floating point value of the new instance.internal Int32SingleUnion(float f)
{
this.i = 0; // Just to keep the compiler happythis.f = f;
}
////// Returns the value of the instance as an integer.
///internalint AsInt32
{
get { return i; }
}
////// Returns the value of the instance as a floating point number.
///internalfloat AsSingle
{
get { return f; }
}
}
#endregion }
}EndianBitConverter第二部分
namespace MiscUtil.Conversion
{
////// Implementation of EndianBitConverter which converts to/from big-endian
/// byte arrays.
///publicsealedclass BigEndianBitConverter : EndianBitConverter
{
////// Indicates the byte order ("endianess") in which data is converted using this class.
///////// Different computer architectures store data using different byte orders. "Big-endian"
/// means the most significant byte is on the left end of a word. "Little-endian" means the
/// most significant byte is on the right end of a word.
//////true if this converter is little-endian, false otherwise.publicsealedoverridebool IsLittleEndian()
{
returnfalse;
}
////// Indicates the byte order ("endianess") in which data is converted using this class.
///publicsealedoverride Endianness Endianness
{
get { return Endianness.BigEndian; }
}
////// Copies the specified number of bytes from value to buffer, starting at index.
//////The value to copy///The number of bytes to copy///The buffer to copy the bytes into///The index to start atprotectedoverridevoid CopyBytesImpl(long value, int bytes, byte[] buffer, int index)
{
int endOffset = index+bytes-1;
for (int i=0; i < bytes; i++)
{
buffer[endOffset-i] = unchecked((byte)(value&0xff));
value = value >> 8;
}
}
////// Returns a value built from the specified number of bytes from the given buffer,
/// starting at index.
//////The data in byte array format///The first index to use///The number of bytes to use///The value built from the given bytesprotectedoverridelong FromBytes(byte[] buffer, int startIndex, int bytesToConvert)
{
long ret = 0;
for (int i=0; i < bytesToConvert; i++)
{
ret = unchecked((ret << 8) | buffer[startIndex+i]);
}
return ret;
}
}
}BigEndianBitConverter第三部分
