C# Stream 和 byte[] 之間的轉換

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

    // 設置當前流的位置為流的開始 
    stream.Seek(0, SeekOrigin.Begin); 
    return bytes; 
} 

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

/// <summary> 
/// 將 Stream 寫入文件 
/// </summary> 
public void StreamToFile(Stream stream,string fileName) 
{ 
    // 把 Stream 轉換成 byte[] 
    byte[] bytes = new byte[stream.Length]; 
    stream.Read(bytes, 0, bytes.Length); 
    // 設置當前流的位置為流的開始 
    stream.Seek(0, SeekOrigin.Begin); 

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

/// <summary> 
/// 從文件讀取 Stream 
/// </summary> 
public Stream FileToStream(string fileName) 
{             
    // 打開文件 
    FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read); 
    // 讀取文件的 byte[] 
    byte[] bytes = new byte[fileStream.Length]; 
    fileStream.Read(bytes, 0, bytes.Length); 
    fileStream.Close(); 
    // 把 byte[] 轉換成 Stream 
    Stream stream = new MemoryStream(bytes); 
    return stream; 
} 

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