Json对象未传递给Web API方法

Question

I've been at this for hours now and still not got it right... someone please put me out of my misery!

javascript:

        var calcParams = {}
        calcParams.calcName="gwp_mat";
        calcParams.components=124.332;

        //return manager.impactCalc(calcName, componentArray)
        return postData("{calcParams2:" + JSON.stringify(calcParams) + "}")
            .then(querySucceeded)
            .fail(queryFailed);


    function postData(cp) {
        $.ajax({
            type: "POST",
            dataType: "json",
            contentType: "application/json",
            url: "/api/breeze/testCalc",
            data: cp,
            success: function (data) {
                alert(data);
                return data;
            },
            error: function (error) {
                jsonValue = jQuery.parseJSON(error.responseText);
            }
        });
    }

model:

Public Class calcParams2
    Public calcName As String
    Public calcNumber As Double
End Class

Server code:

<System.Web.Services.WebMethod()> _
Public Function testCalc(cp As calcParams2) As Double
    Dim c As New calcs
    Return cp.calcNumber
End Function

If I debug it, the "cp" parameter in the javascript postData function is:

"{calcParams2:{"calcName":"gwp_mat","components":124.332}}"

and yet in my web method, calcname is "nothing" and components is "0.0"

If I don't use JSON.Stringify I get a null object in my web method. I think I had one version of code where the calcName was passed but the components value was still zero. That was when I just called "return postData(JSON.stringify(calcParams))" I think.

Answer 1

You only need to send the object parameters in the JSON:

return postData(JSON.stringify(calcParams)) ...

However your JQuery Object needs to have the same parameter names as your Server object. Change your server object to be:

Public Class calcParams2
    Public calcName As String
    Public components As Double
End Class

OR change your client object:

var calcParams = {}
calcParams.calcName="gwp_mat";
calcParams.calcNumber=124.332;