通过Src下载图片存到指定目录

string src = temppartsrc + "." + pictype;

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(src);

            request.AllowAutoRedirect = true;

WebProxy proxy = new WebProxy();

            proxy.BypassProxyOnLocal = true;

            proxy.UseDefaultCredentials = true;

            request.Proxy = proxy;

            WebResponse response = request.GetResponse();

            string virthpath = "";

            using (Stream stream = response.GetResponseStream())

            {

                using (MemoryStream ms = new MemoryStream())

                {

                    Byte[] buffer = new Byte[1024];

                    int current = 0;

                    while ((current = stream.Read(buffer, 0, buffer.Length)) != 0)

                    {

                        ms.Write(buffer, 0, current);

                    }

                    byte[] arry = ms.ToArray();

                     virthpath = "./image/" + DateTime.Now.ToString("yyyyMMddhhmmss") + "." + pictype;

                    string path = Server.MapPath(virthpath);

                    File.WriteAllBytes(path, arry);

                }

            }