C# http 模拟 from 表单提交 文件及其数据

   ///

        /// 上传的方法
        ///

        /// 单个文件名（上传多个文件的方法自己修改）
        /// post请求的url
        /// post的字符串 键值对，相当于表单上的文本框里的字符
        ///
        public static string UploadFileEx(string uploadfile, string url, NameValueCollection poststring)
        {
            Uri uri = new Uri(url);

            string boundary = "----------" + DateTime.Now.Ticks.ToString("x");
            HttpWebRequest webrequest = (HttpWebRequest)WebRequest.Create(uri);
            webrequest.ContentType = "multipart/form-data; boundary=" + boundary;
            webrequest.Method = "POST";

            // Build up the post message header 
            StringBuilder sb = new StringBuilder();

            //加文本
            foreach (string key in poststring.Keys)
            {
                sb.Append("--");
                sb.Append(boundary);
                sb.Append("\r\n");
                sb.Append("Content-Disposition: form-data; name=\"");
                sb.Append(key);
                sb.Append("\"");
                sb.Append("\r\n");
                sb.Append("\r\n");
                sb.Append(poststring.Get(key));
                sb.Append("\r\n");
            }

            //加文件
            sb.Append("--");
            sb.Append(boundary);
            sb.Append("\r\n");
            sb.Append("Content-Disposition: form-data; name=\"filename\";");
            sb.Append("filename=\"");
            sb.Append(Path.GetFileName(uploadfile));
            sb.Append("\"");
            sb.Append("\r\n");
            sb.Append("Content-Type: multipart/form-data");
            sb.Append("\r\n");
            sb.Append("\r\n");

            string postHeader = sb.ToString();
            byte[] postHeaderBytes = Encoding.UTF8.GetBytes(postHeader);

            // Build the trailing boundary string as a byte array 
            // ensuring the boundary appears on a line by itself 
            byte[] boundaryBytes = Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");

            FileStream fileStream = new FileStream(uploadfile, FileMode.Open, FileAccess.Read);
            long length = postHeaderBytes.Length + fileStream.Length + boundaryBytes.Length;
            webrequest.ContentLength = length;

            Stream requestStream = webrequest.GetRequestStream();

            // Write out our post header 
            requestStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);

            // Write out the file contents 
            byte[] buffer = new Byte[checked((uint)Math.Min(4096, (int)fileStream.Length))];
            int bytesRead = 0;
            while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
                requestStream.Write(buffer, 0, bytesRead);

            // Write out the trailing boundary 
            requestStream.Write(boundaryBytes, 0, boundaryBytes.Length);

            webrequest.Timeout = 1000000;

            //System.Windows.Forms.MessageBox.Show(webrequest.Timeout.ToString()); 

            WebResponse responce = webrequest.GetResponse();

            Stream s = responce.GetResponseStream();

            StreamReader sr = new StreamReader(s);

            string str = sr.ReadToEnd();

            fileStream.Close();

            requestStream.Close();

            sr.Close();

            s.Close();

            responce.Close();

            return str;
        }

 

 

 

调用：

        static void Main(string[] args)
        {

            NameValueCollection poststring = new NameValueCollection();

            poststring["username"] = "laokaizzz";//post 的参数    poststring["password"] = "111111111";                string uploadfile;// set to file to upload
            string uploadfile = @"E:\图片\123.jpg";//上传的文件名

            string str = UploadFileEx(uploadfile, "http://localhost:61729/data.aspx", poststring); 

        }

 

http数据请求接口 服务端

  protected void Page_Load(object sender, EventArgs e)
        {
            string username = Request["username"];
            for (int i = 0; i < Request.Files.Count; i++)
            {
                HttpPostedFile img = Request.Files[i];
                string s = img.FileName;
            }

        }