求助攻 C# post请求出错

using System;

using System.Collections.Generic;

using System.Collections.Specialized;

using System.IO;

using System.Net;

using System.Text;



namespace ConsoleApplication3

{

    public class Program

    {

        public static void Main(string[] args)

        {

            NameValueCollection nvc = new NameValueCollection();

            nvc.Add("Connection", "keep-alive");

            nvc.Add("Content-Length", "69140");

            nvc.Add("Content-Type", "multipart/form-data; boundary=----WebKitFormBoundarySBA0xqGYm55HNikN");

            nvc.Add("Accept-Encoding", "gzip,deflate,sdch");

            string[] filenames = new string[] { @"C:\\Users\\MHapDream\\Pictures\\123.jpg" };

            UploadFilesToRemoteUrl(@"http://121.199.45.245/shanshangzx/upload", filenames, nvc);

            Console.ReadKey();

        }



        public static void UploadFilesToRemoteUrl(string url, string[] files, NameValueCollection nvc)

        {



            string boundary = "----------------------------" +

            DateTime.Now.Ticks.ToString("x");



            HttpWebRequest httpWebRequest2 = (HttpWebRequest)WebRequest.Create(url);

            httpWebRequest2.ContentType = "multipart/form-data; boundary=" +

            boundary;

            httpWebRequest2.Method = "POST";

            httpWebRequest2.KeepAlive = true;

            httpWebRequest2.Credentials =

            System.Net.CredentialCache.DefaultCredentials;



            Stream memStream = new System.IO.MemoryStream();



            byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" +

            boundary + "\r\n");



            string formdataTemplate = "\r\n--" + boundary +

            "\r\nContent-Disposition: form-data; name=\"{0}\";\r\n\r\n{1}";



            foreach (string key in nvc.Keys)

            {

                string formitem = string.Format(formdataTemplate, key, nvc[key]);

                byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem);

                memStream.Write(formitembytes, 0, formitembytes.Length);

            }



            memStream.Write(boundarybytes, 0, boundarybytes.Length);



            string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\n Content-Type: application/octet-stream\r\n\r\n";



            for (int i = 0; i < files.Length; i++)

            {



                //string header = string.Format(headerTemplate, "file" + i, files[i]);

                string header = string.Format(headerTemplate, "uplTheFile", files[i]);



                byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);



                memStream.Write(headerbytes, 0, headerbytes.Length);



                FileStream fileStream = new FileStream(files[i], FileMode.Open,

                FileAccess.Read);

                byte[] buffer = new byte[1024];



                int bytesRead = 0;



                while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)

                {

                    memStream.Write(buffer, 0, bytesRead);



                }



                memStream.Write(boundarybytes, 0, boundarybytes.Length);



                fileStream.Close();

            }



            httpWebRequest2.ContentLength = memStream.Length;



            Stream requestStream = httpWebRequest2.GetRequestStream();



            memStream.Position = 0;

            byte[] tempBuffer = new byte[memStream.Length];

            memStream.Read(tempBuffer, 0, tempBuffer.Length);

            memStream.Close();

            requestStream.Write(tempBuffer, 0, tempBuffer.Length);

            requestStream.Close();

            WebResponse webResponse2 = null;

            try

            {

                webResponse2 = httpWebRequest2.GetResponse();

            }

            catch (WebException e)

            {

                Console.WriteLine("Status Code : {0}", ((HttpWebResponse)e.Response).StatusCode);

                Console.WriteLine("Status Description : {0}", ((HttpWebResponse)e.Response).StatusDescription);

            }

            Console.ReadKey();

            Stream stream2 = webResponse2.GetResponseStream();

            StreamReader reader2 = new StreamReader(stream2);



            webResponse2.Close();

            httpWebRequest2 = null;

            webResponse2 = null;

        }

    }

}

补充：.NET技术 ,  C#

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