<转载>byte[]、bitmap和stream之间的转换

原文为：http://blog.csdn.net/wangyue4/article/details/6819102

/byte[] 转图片

public static Bitmap BytesToBitmap(byte[] Bytes)

{

MemoryStream stream = null;

try

{

stream = new MemoryStream(Bytes);

return new Bitmap((Image)new Bitmap(stream));

}

catch (ArgumentNullException ex)

{

throw ex;

}

catch (ArgumentException ex)

{

throw ex;

}

finally

{

stream.Close();

}

}

//图片转byte[]

public static byte[] BitmapToBytes(Bitmap Bitmap)

{

MemoryStream ms = null;

try

{

ms = new MemoryStream();

Bitmap.Save(ms, Bitmap.RawFormat);

byte[] byteImage = new Byte[ms.Length];

byteImage = ms.ToArray();

return byteImage;

}

catch (ArgumentNullException ex)

{

throw ex;

}

finally

{

ms.Close();

}

}

}

=====================

* Stream 和 byte[] 之间的转换

* - - - - - - - - - - - - - - - - - - - - - - - */

/// <summary>

/// 将 Stream 转成 byte[]

/// </summary>

public byte[] StreamToBytes(Stream stream)

{

byte[] bytes = new byte[stream.Length];

stream.Read(bytes, 0, bytes.Length);

// 设置当前流的位置为流的开始

stream.Seek(0, SeekOrigin.Begin);

return bytes;

}

/// <summary>

/// 将 byte[] 转成 Stream

/// </summary>

public Stream BytesToStream(byte[] bytes)

{

Stream stream = new MemoryStream(bytes);

return stream;

}

/* - - - - - - - - - - - - - - - - - - - - - - - -

* Stream 和 文件之间的转换

* - - - - - - - - - - - - - - - - - - - - - - - */

/// <summary>

/// 将 Stream 写入文件

/// </summary>

public void StreamToFile(Stream stream,string fileName)

{

// 把 Stream 转换成 byte[]

byte[] bytes = new byte[stream.Length];

stream.Read(bytes, 0, bytes.Length);

// 设置当前流的位置为流的开始

stream.Seek(0, SeekOrigin.Begin);

// 把 byte[] 写入文件

FileStream fs = new FileStream(fileName, FileMode.Create);

BinaryWriter bw = new BinaryWriter(fs);

bw.Write(bytes);

bw.Close();

fs.Close();

}

/// <summary>

/// 从文件读取 Stream

/// </summary>

public Stream FileToStream(string fileName)

{

// 打开文件

FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);

// 读取文件的 byte[]

byte[] bytes = new byte[fileStream.Length];

fileStream.Read(bytes, 0, bytes.Length);

fileStream.Close();

// 把 byte[] 转换成 Stream

Stream stream = new MemoryStream(bytes);

return stream;

}