Stream 和 byte[] 之间的转换

MemoryStream ms = new MemoryStream(bytes);
ms.Position = 0;
Image img = Image.FromStream(ms);
ms.Close();

1):

var converter = new System.Text.UnicodeEncoding();
byte[] inputBytes = converter.GetBytes("");
string inputString = converter.GetString(inputBytes, 0, inputBytes.Length);

2):

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;
}

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();
}

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;
}

Bitmap BitReturn = new Bitmap();
byte[] bReturn = null;
MemoryStream ms = new MemoryStream();
BitReturn.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
bReturn = ms.GetBuffer();