POSTing JsonObject With HttpClient From Web API

Question

I m trying to POST a JsonObject using HttpClient from Web API  I m not quite sure how to go about this and can t find much in the way of sample code    Here s what I have so far   var myObject    dynamic new JsonObject    myObject Data    some data   myObject Data2    some more data    HttpClient httpClient   new HttpClient  myurl    httpClient DefaultRequestHeaders Accept Add new MediaTypeWithQualityHeaderValue  application json      HttpResponseMessage response   httpClient Post             I think I need to cast my JsonObject as a StreamContent but I m getting hung up on that step

User · Answer

the code over it in vbnet   dim FeToSend as new  object-- gt  define class   Dim client As New HttpClient Dim content   New StringContent FeToSend ToString    Encoding UTF8  application json   content Headers ContentType   New MediaTypeHeaderValue   application json    Dim risp   client PostAsync Chiamata  content  Result  msgbox risp tostring    Hope this help

User · Answer

Depending on your  NET version you could also use HttpClientExtensions PostAsJsonAsync method   https   msdn microsoft com en-us library system net http httpclientextensions postasjsonasync aspx

User · Answer

The easiest way is to use a StringContent  with the JSON representation of your JSON object   httpClient Post              new StringContent          myObject ToString            Encoding UTF8           application json

User · Answer

With the new version of HttpClient and without the WebApi package it would be   var content   new StringContent jsonObject ToString    Encoding UTF8   application json    var result   client PostAsync url  content  Result    Or if you want it async   var result   await client PostAsync url  content

User · Answer

If using Newtonsoft Json   using Newtonsoft Json  using System Net Http  using System Text   public static class Extensions       public static StringContent AsJson this object o            gt  new StringContent JsonConvert SerializeObject o   Encoding UTF8   application json        Example   var httpClient   new HttpClient    var url    https   www duolingo com 2016-04-13 login fields    var data   new   identifier    username   password    password     var result   await httpClient PostAsync url  data AsJson

User · Answer

Thank you pomber but for var result   client PostAsync url  content  Result   I used var result   await client PostAsync url  content    because Result makes app lock for high request

User · Answer

I don t have enough reputation to add a comment on the answer from pomber so I m posting another answer  Using pomber s approach I kept receiving a  400 Bad Request  response from an API I was POSTing my JSON request to  Visual Studio 2017   NET 4 6 2   Eventually the problem was traced to the  Content-Type  header produced by StringContent   being incorrect  see https   github com dotnet corefx issues 7864    tl dr  Use pomber s answer with an extra line to correctly set the header on the request   var content   new StringContent jsonObject ToString    Encoding UTF8   application json    content Headers ContentType   new MediaTypeHeaderValue  application json    var result   client PostAsync url  content  Result

[c#] POSTing JsonObject With HttpClient From Web API

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