我使用C#从网站下载图片，能够下载到电脑，但是图片会变形变色。请问这时是怎么回事呢？还有我把缓冲区设置成64（byte[] buffer = new byte[64];）时和设置成1024时图片的颜色变化不一样，附件是我下载到的图片，第一个图片是使用1024的缓冲区下载的，第二张是用64的缓冲区下的。下面是我的代码

 private void button1_Click(object sender, EventArgs e)
        {
            string url = "http://st.blog.
            string LocalPath = @"E:\imagedownload\1.jpg";
            try
            {
                Uri u = new Uri(url);
                HttpWebRequest mRequest = (HttpWebRequest)WebRequest.Create(u);
                mRequest.Method = "GET";
                mRequest.ContentType = "application/x-www-form-urlencoded";
                HttpWebResponse wr = (HttpWebResponse)mRequest.GetResponse();
                Stream sIn = wr.GetResponseStream();
                FileStream fs = new FileStream(LocalPath, FileMode.OpenOrCreate, FileAccess.Write);

                long length = wr.ContentLength;
                long i = 0;
                decimal j = 0;
               
                while (i < length)
                {
                    byte[] buffer = new byte[1024];
                    i += sIn.Read(buffer, 0, buffer.Length);
                    fs.Write(buffer, 0, buffer.Length);
                }

                sIn.Close();
                wr.Close();
                fs.Close();
                MessageBox.Show("下载完成！");
            }
            catch(Exception ex)
            {
                MessageBox.Show("错了  "+ex.ToString());
            }


        }

[[it] 本帖最后由 slny 于 2008-11-28 14:59 编辑 [/it]]

自己顶一下，希望能有高手帮解释一下。

把 fs.Write(buffer, 0, buffer.Length);
改为
fs.Write(buffer, 0, i);

将缓冲区的内容写入流，慎用缓冲区总长作为其写边界，将可能会引入其他未知数据。
应适用真正读取到的内容长度作为写入长度

已经解决了。只须在下面的代码中修改就OK了
long length = wr.ContentLength;
                long i = 0;
                int k = 0;
                while (i < length)
                {
                    byte[] buffer = new byte[1024];
                    k= sIn.Read(buffer, 0, buffer.Length);
                    i = i + k;
                    fs.Write(buffer, 0, k);
                 }
谢谢铲铲版主大人！