ASP.NET中利用WebClient上传图片到远程服务的方法

<form id="Form1" method="post" runat="server" enctype="multipart/form-data">　　　　<input id="MyFile" type="file" runat="server" />　　　　<br />　　　　<br />　　　　<asp:Button ID="Button1" runat="server" Text="上载文件" OnClick="Button1_Click"></asp:Button>　　</form>

System.Web.HttpFileCollection oFiles = System.Web.HttpContext.Current.Request.Files;   string FilePath = oFiles[0].FileName;   string FileName = FilePath.Substring(FilePath.LastIndexOf("//") + 1);   byte[] b = new byte[oFiles[0].ContentLength];   System.IO.Stream fs = (System.IO.Stream)oFiles[0].InputStream;   fs.Read(b, 0, oFiles[0].ContentLength);   string postData = "data=" + HttpUtility.UrlEncode(Convert.ToBase64String(b));   var webclient = new WebClient();   webclient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");   byte[] byteArray = Encoding.UTF8.GetBytes(postData);   //byte[] buffer = webclient.UploadData("http://localhost/datapush/DataPush.ashx", "POST", byteArray);//ashx   byte[] buffer = webclient.UploadData("http://localhost/datapush/WebServiceDataPush.asmx/DataPush", "POST", byteArray);//asmx   var msg = Encoding.UTF8.GetString(buffer);   Response.Write(msg);

string msg = "";   byte[] filedata = Convert.FromBase64String(context.Request["data"]);   if (filedata.Length == 0)   {    msg= "{/"code/":/"上传的是空文件/"}";   }   if (filedata.Length > 1048576)   {    msg = "{/"code/":/"图片大小不能超过1M/"}";   }   string fileextension = filedata[0].ToString() + filedata[1].ToString();   if (fileextension == "7173")   {    fileextension = "gif";   }   else if (fileextension == "255216")   {    fileextension = "jpg";   }   else if (fileextension == "13780")   {    fileextension = "png";   }   else if (fileextension == "6677")   {    fileextension = "bmp";   }   else if (fileextension == "7373")   {    fileextension = "tif";   }   else   {    msg = "{/"code/":/"上传的文件不是图片/"}";   }   try   {    //保存图片    string filename = Guid.NewGuid().ToString("D") + "." + fileextension;    System.IO.MemoryStream ms = new System.IO.MemoryStream(filedata);    System.IO.FileStream fs = new System.IO.FileStream(context.Server.MapPath("~/") + "/采集图片/" + filename, System.IO.FileMode.Create);    ms.WriteTo(fs);    ms.Close();    fs.Close();    fs = null;    ms = null;    msg = "{/"code/":/"上传图片成功/"}";   }   catch (Exception exe)   {    msg = "{/"code/":/"" + exe.Message + "/"}";   }