winform 从数据库 保存图片到本地

Question

 FileStream fs = File.OpenRead(log);
                byte[] by = new byte[fs.Length];
                fs.Position = 0;
                fs.Read(by, 0,(int) fs.Length);这个是写进数据库的代码   FileStream fs = File.OpenRead(log);
                byte[] by = new byte[fs.Length];
                fs.Position = 0;
                fs.Read(by, 0,(int) fs.Length);这个是读取图片的代码
小弟现在使用 folderBrowserDialog1 来保存图片
 pictureBox1.Image.Save(i.ToString());下载下来的图片显示不出 
高手请教！

Answer 1

错误代码在System.Drawing.Image.Save(String Filename,ImageCoderInfo encoder,EncoderParameters
encoderParams)
System.Drawing.Image.Save(String Filename,ImageFormat fromat)
System.Drawing.Image.Save(String Filename)我在想 是不是文件流的关系 不能正确保存数据

Answer 2

pictureBox1.Image.Save(i.ToString(), System.Drawing.Imaging.ImageFormat.Jpeg);

Answer 3

 this.folderBrowserDialog1.RootFolder = Environment.SpecialFolder.Desktop;
            this.folderBrowserDialog1.SelectedPath = @"E:\浏览器";
            this.folderBrowserDialog1.ShowNewFolderButton = true;
            this.folderBrowserDialog1.Description = "选择文件夹";
            if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
            {
                Random rd = new Random(100);
                int i = rd.Next(1, 9999);
                try
                {                    pictureBox1.Image.Save(i.ToString(), System.Drawing.Imaging.ImageFormat.Jpeg);
                   
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.StackTrace);
                }
            }在Save 的时候就报错  错误上面我贴出来了。大侠看看

Answer 4

//二进制转换为文件
private void DownLoadFile(string sFilePath, byte[] FileBytes)
        {
            FileStream fs = new FileStream(sFilePath, FileMode.CreateNew);
            BinaryWriter bw = new BinaryWriter(fs, Encoding.GetEncoding("gb2312"));
            bw.Write(FileBytes, 0, FileBytes.Length);
            bw.Close();
            fs.Close();
        }