Web API consumed by jSon RRS feed

  • Question

  • This is just killing me.

    It SHOULD be so easy.

    I've written a Web API that I need to call from json, passing arguments and getting a return value (to the json). I'm using POST because I need to pass a really long string.

    I know that my json code is calling the appropriate function because I've seen it happen in the debugger. But the parameter that is passed in is null even though I know for a fact that the json is passing a value. My code for post is returning a value that the json recognizes so the connection is right. It's just the values.

    // POST api/values
    public string Post([FromBody] string counter)
        string retVal;
        retVal = "Sent [" + counter + "]"; //counter (parameter) is always null
        return retVal; //works just fine

    Here is the json code.

           var counter = { counter: $('#counter').val() };

            // I've also tried $.post(uri, 'Hello World')

            $.post(uri, counter)
            .done(function (data) {
                alert('success: ' + data);
            .fail(function () {
                alert('error: ' + Error);

    Can anyone tell me what I'm doing wrong?


    Rik Brooks

    • Moved by Kevin Linq Thursday, September 8, 2016 2:50 AM
    Wednesday, September 7, 2016 2:06 PM

All replies

  • Hi Rik,

    Could try your json code in this way by adding a new keyword.

    var counter = new { counter: $('#counter').val() };


    Sabah Shariq

    Wednesday, September 7, 2016 2:41 PM
  • Thank you so much Sabah but that won't work. I get a JavaScript runtime error at the 'new' which says that Object doesn't support this action


    Rik Brooks

    Wednesday, September 7, 2016 2:57 PM
  • Update, if I change the declaration to

    var counter = $('#counter').val();

    then add alert(counter) I get the right value --- but when I get to the c# code its still null


    Rik Brooks

    Wednesday, September 7, 2016 3:15 PM

    You should try posting to the above forum.

    Wednesday, September 7, 2016 3:47 PM
  • Thank you, thank you.

    Rik Brooks

    Wednesday, September 7, 2016 3:48 PM
  • Hi Rikbrooks

    Thank you for posting here.

    Since your issue is related to  forum, I will move your thread to off-topic. 

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    • Edited by Kevin Linq Thursday, September 8, 2016 2:42 AM
    Thursday, September 8, 2016 2:42 AM