//----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;
}