这个办法用的是浏览器最传统的表单提交形式 application/x-www-form-urlencoded，这个办法可用到两种组合数据的办法，一是间接传递数据到 data 对象，二是组合键/值对类型的数据到 parameters 对象，办法内会优先选择 data 对象所带的参数，如果想要以键/值对的形式传递，将 data 对象的值填为空字符串即可，这两个二选一；获取返回值的办法中退出了异样解决，这使得即便在遇到申请服务器产生服务器谬误（如 404 等 HTTP 状态）时也可失常取得返回的异样信息，应用时须要留神超时值与字符编码集：
using System;using System.Net;using System.Text;using System.IO;using System.Collections.Generic;public string HttpPost(string url, string data = "", IDictionary<string, string> parameters = null, int timeout = 5000, CookieCollection cookies = null){ HttpWebRequest request = null; request = WebRequest.Create(url) as HttpWebRequest; request.Method = "POST"; request.ContentType = "application/x-www-form-urlencoded"; request.Timeout = timeout; if (cookies != null) { request.CookieContainer = new CookieContainer(); request.CookieContainer.Add(cookies); } if (!string.IsNullOrWhiteSpace(data)) { byte[] databytes = Encoding.UTF8.GetBytes(data); using (Stream stream = request.GetRequestStream()) { stream.Write(databytes, 0, databytes.Length); } } else if (parameters != null && parameters.Count != 0) { StringBuilder buffer = new StringBuilder(); int i = 0; foreach (string key in parameters.Keys) { if (i > 0) { buffer.AppendFormat("&{0}={1}", key, parameters[key]); } else { buffer.AppendFormat("{0}={1}", key, parameters[key]); i++; } } byte[] kvdata = Encoding.UTF8.GetBytes(buffer.ToString()); using (Stream stream = request.GetRequestStream()) { stream.Write(kvdata, 0, kvdata.Length); } } try { using (Stream stream = request.GetResponse().GetResponseStream()) { using (StreamReader reader = new StreamReader(stream, Encoding.UTF8)) { return reader.ReadToEnd(); } } } catch (WebException ex) { using (Stream stream = ex.Response.GetResponseStream()) { using (StreamReader reader = new StreamReader(stream, Encoding.UTF8)) { return reader.ReadToEnd(); } } }}相干环境：
.NET Framework 4.0