MVC web api GET parameter is always null

Question

Following is my ajax call

                     $.ajax({
                     type: "GET",
                     url: "https://localhost/api/Client",
                     data:        JSON.stringify({"SortExpression":"clientName","SortDirection":"desc"}),
                     contentType: "application/json; charset=utf-8",
                     async: false,
                     cache: false,
                     dataType:'json',
                     error: function (data) {
                             alert("hi error buddy")
                     },
                     success: function (response) {
                         if (response) {
                           //todo
                         }
                     }
                 });

And my controller

public List<Customer> Get([FromUri] SortFilter filter)
    {

    }

and my model

public class SortFilter
{
    public string SortExpression
    {
        get; set;
    }
    public string SortDirection
    {
        get;  set;
    }
}

but my contoller always takes the parameters as NULL. where am I going wrong ?

Please provide the code for the definition of SortFilter and the assignment of "sort" in your javascript. — Chris Bohatka
– Chris Bohatka, Commented Jun 16, 2014 at 12:11

David · Accepted Answer · 2014-06-16 12:15:59Z

2

You're supplying a value, but not a key. So while the model binder may be able to discern what a SortFilter is, it has no way of knowing what filter is.

Try wrapping the object and giving it a key name. Perhaps something like this:

JSON.stringify({"filter":{"SortExpression":"clientName","SortDirection":"desc"}})

answered Jun 16, 2014 at 12:15

David

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Comments

zx485 · Accepted Answer · 2016-02-26 21:53:34Z

0

GET requests are performed on the query string, which should not be JSON encoded. POST, and PUT data may be JSON encoded, but not GET. The reason your parameter is null is because the query string is a single string with no parameter name.

replace:

data:JSON.stringify({"SortExpression":"clientName","SortDirection":"desc"})

with

data:{"SortExpression":"clientName","SortDirection":"desc"}

You can check the WebAPI call directly by typing in the full URL to the web API method

https://localhost/api/Client?SortExpression=clientName&SortDirection=desc

This will allow you to debug your data retriever, and page separately which should make the whole process much easier.

edited Feb 26, 2016 at 21:53

zx485

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answered Feb 26, 2016 at 20:30

James Bunch

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