C # uses HttpWebRequest post to submit data with examples of cookies and related parameters

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;usingSystem.Configuration;usingSystem.Data.SqlClient;usingSystem.Data;usingSystem.Diagnostics;usingSystem.Net;usingSystem.IO;namespacesample2{classProgram {Static voidMain (string[] args) {            Try            {                //Data                stringCOOKIESTR ="51fd9f14fa7561b5"; stringPostData =string. Format ("Userid={0}&password={1}","Guest","123456"); byte[] data =Encoding.UTF8.GetBytes (postdata); //Prepare Web Request ...HttpWebRequest request = (HttpWebRequest) webrequest.create ("https://www.xxx.com"); Request. Method="POST"; //request. Referer = "https://www.xxx.com";Request. ContentType ="application/x-www-form-urlencoded; Charset=utf-8"; Request. UserAgent="mozilla/5.0 (Windows NT 10.0; Win64; x64) applewebkit/537.36 (khtml, like Gecko) chrome/56.0.2924.87 safari/537.36"; //request. Host = "www.xxx.com";Request. Headers.add ("Cookies", cookiestr); Request. ContentLength=data.                Length; Stream Newstream=request.                GetRequestStream (); //Send the data.Newstream.write (data,0, data.                Length);                Newstream.close (); //Get ResponseHttpWebResponse Myresponse =(HttpWebResponse) request.                GetResponse (); StreamReader Reader=NewStreamReader (Myresponse.getresponsestream (), Encoding.UTF8); stringContent =Reader.                ReadToEnd ();                Console.WriteLine (content);            Console.ReadLine (); }            Catch(Exception) {Throw; }        }    }}

/// <summary>///Call SMS interface to send SMS, need to cooperate with the template/// </summary>/// <param name= "UserName" >Interface User name</param>/// <param name= "Userpwd" >Interface Password</param>/// <param name= "mobile" >send a mobile phone number</param>/// <param name= "Content" >Send content</param>/// <returns>The return value is greater than 0, the sending succeeds, the system-generated task ID or the custom task ID</returns> Public Static stringPostsms (stringUserName,stringUserpwd,stringMobilestringcontent) {    stringSrcstring ="-999"; Try    {        stringPoststring =string. Format ("Username={0}&password={1}&mobile={2}&content={3}", UserName, MD5 (UserName +MD5 (USERPWD)), mobile, content); byte[] PostData = Encoding.UTF8.GetBytes (poststring);//coding, especially Chinese characters, in advance to see how to crawl the page encoding        stringURL ="http://xxx/smsSend.do";//AddressWebClient WebClient =NewWebClient (); WEBCLIENT.HEADERS.ADD ("Content-type","application/x-www-form-urlencoded");//To take the post must be added to the header, if you change to get a way to remove this sentence can be        byte[] responsedata = Webclient.uploaddata (URL,"POST", PostData);//get a stream of returned characterssrcstring = Encoding.UTF8.GetString (responsedata);//decoding    }    Catch { }    returnsrcstring;}

    classProgram {Static voidMain (string[] args) {            varstr = DownloadStringAsync (NewUri ("http://www.baidu.com")); Console.WriteLine (str.            Result);        Console.ReadLine (); }        Static Asynctask<string>DownloadStringAsync (Uri uri) {//WebClient does not support timeout settings//while Httpwebrequst allows you to set the request header or require more control over the content            varWebClient =NewWebClient (); Webclient.encoding=System.Text.Encoding.UTF8; varresult =awaitWebclient.downloadstringtaskasync (URI); returnresult; }    }

C # uses HttpWebRequest post to submit data with examples of cookies and related parameters