/// <summary>/// 发送http post请求/// </summary>/// <param name="url">地址</param>/// <param name="parameters">查询参数集合</param>/// <returns></returns>public HttpWebResponse CreatePostHttpResponse(string url, IDictionary<string, string> parameters){HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;//创建请求对象request.Method = "POST";//请求方式request.ContentType = "application/x-www-form-urlencoded";//链接类型//构造查询字符串if (!(parameters == null || parameters.Count == 0)){StringBuilder buffer = new StringBuilder();bool first = true;foreach (string key in parameters.Keys){if (!first){buffer.AppendFormat("&{0}={1}", key, parameters[key]);}else{buffer.AppendFormat("{0}={1}", key, parameters[key]);first = false;}}byte[] data = Encoding.UTF8.GetBytes(buffer.ToString());//写入请求流using (Stream stream = request.GetRequestStream()){stream.Write(data, 0, data.Length);}}return request.GetResponse() as HttpWebResponse;}/// <summary>/// 发送http Get请求/// </summary>/// <param name="url"></param>/// <returns></returns>public static HttpWebResponse CreateGetHttpResponse(string url){HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;request.Method = "GET";request.ContentType = "application/x-www-form-urlencoded";//链接类型return request.GetResponse() as HttpWebResponse;}/// <summary>/// 从HttpWebResponse对象中提取响应的数据转换为字符串/// </summary>/// <param name="webresponse"></param>/// <returns></returns>public string GetResponseString(HttpWebResponse webresponse){using (Stream s = webresponse.GetResponseStream()){StreamReader reader = new StreamReader(s, Encoding.UTF8);return reader.ReadToEnd();}}

//post请求并调用Dictionary<string, string> dic = new Dictionary<string, string>();
dic.Add("id", "4");
textBox1.Text = GetResponseString(CreatePostHttpResponse("https://www.baidu.com/", dic));
//get请求并调用textBox3.Text = GetResponseString(CreateGetHttpResponse("https://i.cnblogs.com/EditPosts.aspx?opt=1"));