C# Stream 和 byte[] 之间的转换

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/* - - - - - - - - - - - - - - - - - - - - - - - - 
* 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; 
}