Error sending json in POST to web API service

Question

I m creating a web service using Web API  I implemented a simple class  public class ActivityResult       public String code      public int indexValue      public int primaryCodeReference      And then I have implemented inside my controller   HttpPost  public HttpResponseMessage Post ActivityResult ar        return new HttpResponseMessage HttpStatusCode OK       But when I call the API passing in POST the file json     code   XXX-542   indexValue   3   primaryCodeReference   7     I obtain the following error message          Message    The request entity s media type  text plain  is not supported for this resource         ExceptionMessage    No MediaTypeFormatter is available to read an object of type  ActivityResult  from content with media type  text plain          ExceptionType    System Net Http UnsupportedMediaTypeException        StackTrace       in System Net Http HttpContentExtensions ReadAsAsync T  HttpContent content  Type type  IEnumerable 1 formatters  IFormatterLogger formatterLogger  CancellationToken cancellationToken  r n   in System Net Http HttpContentExtensions ReadAsAsync HttpContent content  Type type  IEnumerable 1 formatters  IFormatterLogger formatterLogger  CancellationToken cancellationToken  r n   in System Web Http ModelBinding FormatterParameterBinding ReadContentAsync HttpRequestMessage request  Type type  IEnumerable 1 formatters  IFormatterLogger formatterLogger  CancellationToken cancellationToken       What am I doing wrong

User · Answer

It require to include Content-Type application json in web api request header section when not mention any content then  by default it is Content-Type text plain passes to request   Best way to test api on postman tool

User · Answer

I had all my settings covered in the accepted answer  The problem I had was that I was trying to update the Entity Framework entity type  Task  like   public IHttpActionResult Post Task task    What worked for me was to create my own entity  DTOTask  like   public IHttpActionResult Post DTOTask task

User · Answer

In the HTTP request you need to set Content-Type to  Content-Type  application json  So if you re using fiddler client add Content-Type  application json to the request header

User · Answer

another tip   where to add  content-type  application json    to the textbox field on the Composer Parsed tab   There are 3 lines already filled in there  so I added this Content-type as the 4th line   That made the Post work

User · Answer

You have to must add header property Content-Type application json When you define any POST request method input parameter that should be annotated as  FromBody   e g     HttpPost  public HttpResponseMessage Post  FromBody ActivityResult ar      return new HttpResponseMessage HttpStatusCode OK      Any JSON input data must be raw data

User · Answer

Please check if you are were passing method as POST instead as GET  if so you will get same error as a you posted above    http                   method   GET        The request entity s media type  text plain  is not supported for   this resource

[c#] Error sending json in POST to web API service

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