Streamとbyte[]間の変換

/* - - - - - - - - - - - - - - - - - - - - - - - - 
* Stream   byte[]   
* - - - - - - - - - - - - - - - - - - - - - - - */ 
/// <summary> 
///   Stream   byte[] 
/// </summary> 
public byte[] StreamToBytes(Stream stream) 
{ 
byte[] bytes = new byte[stream.Length]; 
stream.Read(bytes, 0, bytes.Length); 

//   
stream.Seek(0, SeekOrigin.Begin); 
return bytes; 
} 

/// <summary> 
///   byte[]   Stream 
/// </summary> 
public Stream BytesToStream(byte[] bytes) 
{ 
Stream stream = new MemoryStream(bytes); 
return stream; 
} 


/* - - - - - - - - - - - - - - - - - - - - - - - - 
* Stream     
* - - - - - - - - - - - - - - - - - - - - - - - */ 
/// <summary> 
///   Stream   
/// </summary> 
public void StreamToFile(Stream stream,string fileName) 
{ 
//   Stream   byte[] 
byte[] bytes = new byte[stream.Length]; 
stream.Read(bytes, 0, bytes.Length); 
//   
stream.Seek(0, SeekOrigin.Begin); 

//   byte[]   
FileStream fs = new FileStream(fileName, FileMode.Create); 
BinaryWriter bw = new BinaryWriter(fs); 
bw.Write(bytes); 
bw.Close(); 
fs.Close(); 
} 

/// <summary> 
///   Stream 
/// </summary> 
public Stream FileToStream(string fileName) 
{ 
//   
FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read); 
//   byte[] 
byte[] bytes = new byte[fileStream.Length]; 
fileStream.Read(bytes, 0, bytes.Length); 
fileStream.Close(); 
//   byte[]   Stream 
Stream stream = new MemoryStream(bytes); 
return stream; 
}