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C# Stream 和 byte[] 之间的转换 
一. 二进制转换成图片
MemoryStream ms = new MemoryStream(bytes);
ms.Position = 0;
Image img = Image.FromStream(ms);
ms.Close();
this.pictureBox1.Image
 
二. C#中byte[]与string的转换代码
 
1、System.Text.UnicodeEncoding converter = new System.Text.UnicodeEncoding();
　　byte[] inputBytes =converter.GetBytes(inputString);
　　string inputString = converter.GetString(inputBytes);
 
2、string inputString = System.Convert.ToBase64String(inputBytes);
　　byte[] inputBytes = System.Convert.FromBase64String(inputString);
FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);
 
三. C# Stream 和 byte[] 之间的转换
 
/// 将 Stream 转成 byte[]
 
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; 
}
 
/// 将 byte[] 转成 Stream
 
public Stream BytesToStream(byte[] bytes) 
{ 
    Stream stream = new MemoryStream(bytes); 
    return stream; 
}
 
四. Stream 和 文件之间的转换
 
将 Stream 写入文件
 
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(); 
}
 
五. 从文件读取 Stream
 
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; 
}