c# HttpWebRequest 连续post

Posted 2023-05-17

以下代码,只能执行第一次,当提示messagebox.show到达m=2时就卡住了,不会继续post下去,请问是什么原因?
for (int m = 1; m <= 10; m++)

HttpWebRequest hreq = (HttpWebRequest)HttpWebRequest.Create("http://www.test.com/my/test.php");
hreq.Method = "POST";
hreq.ContentType = "application/x-www-form-urlencoded";

hreq.CookieContainer = myCookieContainer;
string postdata = "action=do&id="+m;
byte[] byte1 = Encoding.ASCII.GetBytes(postdata);
hreq.ContentLength = byte1.Length;

Stream poststream = hreq.GetRequestStream();
poststream.Write(byte1, 0, byte1.Length);
poststream.Close();
//HttpWebResponse hres = (HttpWebResponse)hreq.GetResponse();
MessageBox.Show(Convert.ToString(m));
Thread.Sleep(3000);

解决问题了
虽然用的不是两位的方法解决的,但还是谢谢了.

参考技术A hreq.Timeout = 2000;
加一句上面的代码，主要原因是请求的默认超时时间为100秒，打开太多请求把主线程堵死，才会出现你所说的现象。

我把我的代码放在一个Button的onclick事件里面，可以正常显示到10没问题，你不是不把代码放在了Form的构造函数里了？本回答被提问者和网友采纳 参考技术B 出现这个问题是因为你的第一个请求还没有完成，然后又开始了第二个请求，建议判断一下状态，请求完成后后再进行第二次发送
if (hreq.readyState == 4) //判断响应已完成

if (hreq.status == 200) //判断状态是否顺利

参考技术C 我想问一下，你是怎么解决的！HttpWebRequest.Post怎么能提高它的性能！

C#利用HttpWebRequest进行post请求的示例（HTTPS）

代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.Net;
using System.IO;
using System.IO.Compression;
using System.Text.RegularExpressions;   

namespace HttpWebRequestDemo

    class Program
    
        private static readonly string DefaultUserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";

        private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
        
            return true; //总是接受   
        

        public static HttpWebResponse CreatePostHttpResponse(string url, IDictionary<string, string> parameters,Encoding charset)
        
            HttpWebRequest request = null;
            //HTTPSQ请求
            ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
            request = WebRequest.Create(url) as HttpWebRequest;
            request.ProtocolVersion = HttpVersion.Version10;
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            request.UserAgent = DefaultUserAgent;
            //如果需要POST数据   
            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[] data = charset.GetBytes(buffer.ToString());
                using (Stream stream = request.GetRequestStream())
                
                    stream.Write(data, 0, data.Length);
                
            
            return request.GetResponse() as HttpWebResponse;
           

        static void Main(string[] args)
        
            string url = "https://192.168.1.101/httpOrg/create";
            Encoding encoding = Encoding.GetEncoding("utf-8");
            IDictionary<string, string> parameters = new Dictionary<string, string>();
            parameters.Add("authuser", "*****");
            parameters.Add("authpass", "*****");
            parameters.Add("orgkey","*****");
            parameters.Add("orgname", "*****");
            HttpWebResponse response = Program.CreatePostHttpResponse(url,parameters,encoding);
            //打印返回值
            Stream stream = response.GetResponseStream();   //获取响应的字符串流
            StreamReader sr = new StreamReader(stream); //创建一个stream读取流
            string html = sr.ReadToEnd();   //从头读到尾，放到字符串html
            Console.WriteLine(html); 
        
    

HttpWebRequest默认会用代理进行连接，导致获取结果比较慢。解决办法是，配置：

request.Proxy = null;

不使用代理，即可。