How to post data to specific URL using WebClient in C

Question

I need to use  HTTP Post  with WebClient to post some data to a specific URL I have   Now  I know this can be accomplished with WebRequest but for some reasons I wanna use WebClient instead  Is that possible  If so  can someone show me some example or point me to the right direction

User · Answer

string URI    site com mail php   using  WebClient client   new WebClient          System Collections Specialized NameValueCollection postData            new System Collections Specialized NameValueCollection                             to   emailTo                       subject   currentSubject                     body   currentBody                 string pagesource   Encoding UTF8 GetString client UploadValues URI  postData

User · Answer

Using webapiclient with model send serialize json parameter request   PostModel cs      public string Id   get  set        public string Name   get  set        public string Surname   get  set        public int Age   get  set      WebApiClient cs  internal class WebApiClient    IDisposable          private bool  isDispose       public void Dispose                 Dispose true           GC SuppressFinalize this              public void Dispose bool disposing                if    isDispose                         if  disposing                                                   isDispose   true             private void SetHeaderParameters WebClient client                client Headers Clear            client Headers Add  Content-Type    application json            client Encoding   Encoding UTF8             public async Task lt T gt  PostJsonWithModelAsync lt T gt  string address  string data                 using  var client   new WebClient                          SetHeaderParameters client               string result   await client UploadStringTaskAsync address  data       method        The HTTP method used to send the file to the resource  If null  the default is  POST              return JsonConvert DeserializeObject lt T gt  result                       Business caller method      public async Task lt ResultDTO gt  GetResultAsync PostModel model                try                       using  var client   new WebApiClient                                  var serializeModel  JsonConvert SerializeObject model     using Newtonsoft Json                  var response   await client PostJsonWithModelAsync lt ResultDTO gt   http   www website com api create   serializeModel                   return response                                  catch  Exception ex                        throw new Exception ex Message

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Using simple client UploadString adress  content   normally works fine but I think it should be remembered that a WebException will be thrown if not a HTTP successful status code is returned  I usually handle it like this to print any exception message the remote server is returning   try       postResult   client UploadString address  content     catch  WebException ex        String responseFromServer   ex Message ToString              if  ex Response    null                using  WebResponse response   ex Response                        Stream dataRs   response GetResponseStream                using  StreamReader reader   new StreamReader dataRs                                 responseFromServer    reader ReadToEnd                     log Error  Server Response      responseFromServer                                     throw

User · Answer

There is a built in method called UploadValues that can send HTTP POST  or any kind of HTTP methods  AND handles the construction of request body  concatenating parameters with   amp   and escaping characters by url encoding  in proper form data format   using WebClient client   new WebClient          var reqparm   new System Collections Specialized NameValueCollection        reqparm Add  param1     lt any gt  kinds  amp  of     strings        reqparm Add  param2    escaping is already handled        byte   responsebytes   client UploadValues  http   localhost    POST   reqparm       string responsebody   Encoding UTF8 GetString responsebytes

User · Answer

Using WebClient UploadString or WebClient UploadData you can POST data to the server easily   I   ll show an example using UploadData  since UploadString is used in the same manner as DownloadString  byte   bret   client UploadData  quot http   www website com post php quot    quot POST quot                   System Text Encoding ASCII GetBytes  quot field1 value1 amp amp field2 value2 quot        string sret   System Text Encoding ASCII GetString bret    More  http   www daveamenta com 2008-05 c-webclient-usage

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Making a POST request using WebClient  Function           WebClient wc   new WebClient       var URI   new Uri  http   your uri goes here         If any encoding is needed    wc Headers  Content-Type      application x-www-form-urlencoded       Or any other encoding type       If any key needed    wc Headers  KEY      Your Key Goes Here      wc UploadStringCompleted           new UploadStringCompletedEventHandler wc UploadStringCompleted      wc UploadStringAsync URI  POST   Data To Be sent           void wc  UploadStringCompleted object sender  UploadStringCompletedEventArgs e            try                                MessageBox Show e Result           e result fetches you the response against your POST request                 catch Exception exc                                 MessageBox Show exc ToString

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I just found the solution and yea it was easier than I thought     so here is the solution         string URI    http   www myurl com post php   string myParameters    param1 value1 amp param2 value2 amp param3 value3    using  WebClient wc   new WebClient          wc Headers HttpRequestHeader ContentType     application x-www-form-urlencoded       string HtmlResult   wc UploadString URI  myParameters       it works like charm

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Here is the crisp answer   public String sendSMS String phone  String token        WebClient webClient   WebClient create smsServiceUrl        SMSRequest smsRequest   new SMSRequest        smsRequest setMessage token       smsRequest setPhoneNo phone       smsRequest setTokenId smsServiceTokenId        Mono lt String gt  response   webClient post              uri smsServiceEndpoint             header HttpHeaders CONTENT TYPE  MediaType APPLICATION JSON VALUE             body Mono just smsRequest   SMSRequest class             retrieve   bodyToMono String class        String deliveryResponse   response block        if  deliveryResponse equalsIgnoreCase  success            return deliveryResponse            return null

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