Webapi parameter is null on Method

Question

I'm trying to post back a list of data objects (WorkOrders), in JSON format to my Webapi controller, this works amazingly well, except for the slight flaw in that the data object parameter (savemodel) is null when it hits the webapi controller. This is a snip from the JS (slots is mock data)

var slots = [];    
            slots.push({ 'WorkOrder': 'XX21', 'OrderDate': '2015-10-11 00:00:00', 'Slot': '1', 'SageRef': 'HS11' });
            slots.push({ 'WorkOrder': 'XX22', 'OrderDate': '2015-10-12 00:00:00', 'Slot': '2', 'SageRef': 'HS12' })
            slots.push({ 'WorkOrder': 'XX23', 'OrderDate': '2015-10-13 00:00:00', 'Slot': '3', 'SageRef': 'HS13' });
            console.log(JSON.stringify({ 'savemodel': slots }))
            $.ajax({
                type: "POST",
                url: 'http://localhost:55821/api/schedule',
                data: JSON.stringify({ 'savemodel': slots }),
                contentType: 'application/json; charset=utf-8'                
            }).success(function (data) {
                $scope.$apply(function () {
                    if (data.SaveMessage.length > 0) {
                      // do something
                    }
                    else {
                      // do something else
                    }
                });
            });

The model:

    public class WorkOrderModel
{
    public string WorkOrder { get; set; }
    public string OrderDate { get; set; }
    public string SlotNumber { get; set; }
    public string SageRef { get; set; }
}

The postback method:

 [HttpPost]
        public IHttpActionResult UpdateWorkOrder([FromBody]List<WorkOrderModel> savemodel)
        {
            StringBuilder saveMessage = new StringBuilder();
            foreach (WorkOrderModel model in savemodel)
            {
                   // save the WO model object  here                
            }
            if (saveMessage.Length > 0)
            {
                return Ok(new { SaveMessage = "There were issues: " + saveMessage.ToString() });
            }
            else
            {
                return Ok(new { SaveMessage = "" });
            }
        }

Posted JSON Null parameter in the WebApi Controller This is driving me nuts so any help will be hugely appreciated at this stage!

Regards, itsdanny

could you post a snippet code of your Post controller method — BRAHIM Kamel
– BRAHIM Kamel, Commented Oct 27, 2015 at 16:35
I think you need to set dataType: 'json' in your ajax call. See AJAX & Web Api Post Method - How does it work?. — dbc
– dbc, Commented Oct 28, 2015 at 5:43
Thanks @dbc but I still get a null parameter when it hits the post method. I've also tried [FromUrI] but it’s still null. — ItsDanny
– ItsDanny, Commented Oct 28, 2015 at 8:17

ItsDanny · Accepted Answer · 2015-10-28 08:25:44Z

1

Sorted, it changed

data: JSON.stringify({ 'savemodel': slots}),

to

data: JSON.stringify(slots),

answered Oct 28, 2015 at 8:25

ItsDanny

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