C#实现图片文件到数据流，再到图片文件的转换

//----引入必要的命名空间
using system.io;
using system.drawing.imaging;

//----代码部分----//


private byte[] photo;//公用缓冲区
public string sourfilepath;//源图片文件路径
public string objfilepath;//目标图片路径

public int filetostream()//文件到流的转换
{
    image img = new bitmap(sourfilepath);
    memorystream stream = new memorystream();
    img.save(stream, imageformat.bmp);
    binaryreader br = new binaryreader(stream);
    photo = stream.toarray();
    stream.close();
    return 0;
}

public image showpic()//根据流显图
{
    byte[] bytes = photo;
    memorystream ms = new memorystream(bytes);
    ms.position = 0;
    image img = image.fromstream(ms);
    ms.close();
    return img;
}

public int streamtofile()//反向转换
{
    byte[] bytes = photo;
    filestream fs = new filestream(objfilepath, filemode.create, fileaccess.write);
    fs.write(bytes, 0, bytes.length);
    fs.flush();
    fs.close();
    return 0;
}