C# 主动发起请求代码

本文用于写代码是给提示

 private string GetHW(string uri)
 {
     string returnStr = "";
     HttpWebRequest hwRequest = (HttpWebRequest)System.Net.WebRequest.Create(uri);
     hwRequest.Method = "GET";
     HttpWebResponse hwRespone = (HttpWebResponse)hwRequest.GetResponse();
     if (hwRespone != null && hwRespone.StatusCode == HttpStatusCode.OK)
     {
         //流的处理有必要还有进行解压缩之类的
         using (StreamReader sr = new StreamReader(hwRespone.GetResponseStream(), Encoding.UTF8))
         {
             returnStr = sr.ReadToEnd();
         }
     }
     return returnStr;
 }

 private string PostHW(string uri, string postString)
 {
     string returnStr = "";
     HttpWebRequest hwRequest = (HttpWebRequest)System.Net.WebRequest.Create(uri);
     hwRequest.Method = "Post";
     hwRequest.ContentType = "application/x-www-form-urlencoded";  //设置ContntType ，这句很重要，否则无法传递参数

     byte[] postData = Encoding.UTF8.GetBytes(postString);//postData即为发送的数据
     hwRequest.ContentLength = postData.Length;//设置客户端发送的内容长度

     Stream requestStream = hwRequest.GetRequestStream();//获取请求流
     requestStream.Write(postData, , postData.Length);//把参数写入流
     requestStream.Close();//关闭请求流

     HttpWebResponse hwRespone = (HttpWebResponse)hwRequest.GetResponse();
     Stream responseStream = hwRespone.GetResponseStream();//得到回应流

     if (hwRespone != null && hwRespone.StatusCode == HttpStatusCode.OK)
     {
         using (StreamReader sr = new StreamReader(hwRespone.GetResponseStream(), Encoding.UTF8))
         {
             returnStr = sr.ReadToEnd();
         }
     }
     responseStream.Close();//关闭回应流
     return returnStr;
 }

 private string GetWebClient(string uri)
 {
     string returnStr = "";
     WebClient wCient = new System.Net.WebClient();
     wCient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
     using (StreamReader sr = new StreamReader(wCient.OpenRead(uri), Encoding.UTF8))
     {
         returnStr = sr.ReadToEnd();
     }
     return returnStr;
 }
 public string GetWebClient2(string uri)
 {
     uri = @"";
     string returnStr = "";
     WebClient wCient = new System.Net.WebClient();
     wCient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
     byte[] responseData = wCient.DownloadData(uri);
     //using (StreamReader sr = new StreamReader(wCient.OpenRead(uri), Encoding.UTF8))
     //{
     //    returnStr = sr.ReadToEnd();
     //}
     returnStr = Encoding.UTF8.GetString(responseData);//返回接受的数据
     return returnStr;
 }

 private string PostWebClient(string uri, string postString)
 {
     string returnStr = "";
     //string postString = "userName=123&city=101";//设置参数，POST参数的格式是  参数1=值1&参数2=值2&参数3=值3 //PostString = "blog_title=博客标题&";PostString += "blog_body=博客内容&";PostString += "blog_class=1";//将参数字符串转换成字节数组。

     WebClient wCient = new System.Net.WebClient();
     wCient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
     byte[] postData = Encoding.ASCII.GetBytes(postString);
     byte[] responseData = wCient.UploadData(uri, "POST", postData);//得到返回字符流
     returnStr = Encoding.UTF8.GetString(responseData);//返回接受的数据
     return returnStr;
 }