How to post to asp.net core web api controller and get argument with value

Question

I am struggling with getting my self hosted asp.net web api server to get a call to post on a controller.

$.ajax({
    url: mySelfHostedAspWebApi, //i.e. http://1.2.3.4:1234/
    type: "POST",
    data: cmd,
    contentType: 'application/json',
    success: (function(scanCmd) {

   }), //success: (function (scanCmd){
});// $.ajax({

And the asp.net core controller in C# is pretty straight.

  ...
  [Route( "" )]
  [HttpPost]
  public HttpResponseMessage Post(Command cmd)
  {
     ASSERT(null,cmd); // <=== problem here !!!
     if(cmd=="go") Go(";-)");
     ...

In one of my old projects, I came across a similar kind of problem... And the fix was to open some file on the system, that controlled if the post was availible for myselfhostedapp and write the POST on the line that controlled the access to my application. (I just cannot recall what file it was...)

if this sounds familiar, please add a hint.. thanks

Just checking, why haven't you declared your cmd parameter with the FromBody attribute like this: public HttpResponseMessage Post([FromBody] Command cmd)? — Quality Catalyst
– Quality Catalyst, Commented Sep 6, 2017 at 7:35
Possible duplicate of stackoverflow.com/questions/45862459/…. — Kirk Larkin
– Kirk Larkin, Commented Sep 6, 2017 at 7:43
I debugged a bit further, and found that the problem was caused by having the contentType: 'application/json' in the ajax call.. — kfn
– kfn, Commented Sep 6, 2017 at 7:52

Quality Catalyst · Accepted Answer · 2017-09-06 07:37:40Z

1

I reckon you are missing the FromBody parameter declaration for your cmd parameter like this:

[Route( "" )]
[HttpPost]
public HttpResponseMessage Post([FromBody] Command cmd) // <<- tweak here
{
    ASSERT(null,cmd); // <=== no problem here :-)
    if(cmd=="go") Go(";-)");
    ...

answered Sep 6, 2017 at 7:37

Quality Catalyst

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kfn · Accepted Answer · 2017-09-06 07:53:25Z

0

the problem was in the use of contentType: 'application/json' in the ajax call. - I removed that, and got the data across.

answered Sep 6, 2017 at 7:53

kfn

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