How do I set up HttpContent for my HttpClient PostAsync second parameter

Question

public static async Task lt string gt  GetData string url  string data        UriBuilder fullUri   new UriBuilder url        if   string IsNullOrEmpty data           fullUri Query   data       HttpClient client   new HttpClient         HttpResponseMessage response   await client PostAsync new Uri url     expects HttpContent          response Content Headers ContentType   new MediaTypeHeaderValue  application json        response EnsureSuccessStatusCode        string responseBody   await response Content ReadAsStringAsync         return responseBody      The PostAsync takes another parameter that needs to be HttpContent   How do I set up an HttpContent  There Is no documentation anywhere that works for Windows Phone 8   If I do GetAsync  it works great  but it needs to be POST with the content of key  bla   something  yay     EDIT  Thanks so much for the answer    This works well  but still a few unsures here       public static async Task lt string gt  GetData string url  string data                data    test something            HttpClient client   new HttpClient            StringContent queryString   new StringContent data            HttpResponseMessage response   await client PostAsync new Uri url   queryString               response Content Headers ContentType   new MediaTypeHeaderValue  application json            response EnsureSuccessStatusCode            string responseBody   await response Content ReadAsStringAsync             return responseBody          The data  test something  I assumed would pick up on the api side as post data  test   evidently it does not  On another matter  I may need to post entire objects arrays through post data  so I assume json will be best to do so  Any thoughts on how I get post data through   Perhaps something like   class SomeSubData       public string line1   get  set        public string line2   get  set       class PostData       public string test   get  set        public SomeSubData lines   get  set       PostData data   new PostData        test    something       lines   new SomeSubData           line1    a line           line2    a second line          StringContent queryString   new StringContent data      But obviously that won t work

User · Answer

public async Task lt ActionResult gt  Index                 apiTable table   new apiTable            table Name    quot Asma Nadeem quot           table Roll    quot 6655 quot            string str    quot  quot           string str2    quot  quot            HttpClient client   new HttpClient             string json   JsonConvert SerializeObject table            StringContent httpContent   new StringContent json  System Text Encoding UTF8   quot application json quot             var response   await client PostAsync  quot http   YourSite com api apiTables quot   httpContent            str    quot  quot    response Content    quot     quot    response StatusCode           if  response IsSuccessStatusCode                               str2    quot Data Posted quot                      return View

User · Answer

To add to Preston s answer  here s the complete list of the HttpContent derived classes available in the standard library     Credit  https   pfelix wordpress com 2012 01 16 the-new-system-net-http-classes-message-content   There s also a supposed ObjectContent but I was unable to find it in ASP NET Core    Of course  you could skip the whole HttpContent thing all together with Microsoft AspNet WebApi Client extensions  you ll have to do an import to get it to work in ASP NET Core for now  https   github com aspnet Home issues 1558  and then you can do things like   var response   await client PostAsJsonAsync  AddNewArticle   new Article       Title    New Article Title       Body    New Article Body

User · Answer

This is answered in some of the answers to Can  39 t find how to use HttpContent as well as in this blog post   In summary  you can t directly set up an instance of HttpContent because it is an abstract class  You need to use one the classes derived from it depending on your need  Most likely StringContent  which lets you set the string value of the response  the encoding  and the media type in the constructor  See  http   msdn microsoft com en-us library system net http stringcontent aspx

[c#] How do I set up HttpContent for my HttpClient PostAsync second parameter?

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