Why is my C# web service not getting my JSON Array data?

Question

I am using AJAX to pass a JSON Array to a .NET web service. The Stringified JSON array is correct when sent - I show the content in a JS alert - but when I output it within the web service, it just displays null values.

Help.

The JS is this:

                var listitems = [];
                $('#job-item-list').children('.iamalistitem').each(function () {
                    listitems.push({ "title": $(this).find('.job-item-title').text(), "price": $(this).find('.job-item-price').text().replace("£","").replace("&pound;","") });
                });
                alert(JSON.stringify({ ListItems: listitems }));

                $.ajax({
                    type: "POST",
                    url: "/ld_jobs.asmx/putJobItems",
                    // The key needs to match your method's input parameter (case-sensitive).
                    data: JSON.stringify({ ListItems : listitems }),
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    success: function (response) {
                        var responseObjTwo = JSON.parse(response.d);
                        //showUserMessage(responseObjTwo.Message, false);
                        showUserMessage(response.d, false);
                    },
                    error: function (response) {
                        var responseObj = JSON.parse(response.responseText);
                        showUserMessage(responseObj.Message, true);
                    }
                });

The receiving service is this:

    public class ListItem
    {
        public string itemTitle { get; set; }
        public decimal itemPrice { get; set; }
    }

    [WebMethod]
    [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
    public string putJobItems(ListItem[] ListItems)
    {
        // Add to DB
        int errorNumber = 0;
        try
        {
            // check if on DB already
            string returnstring = "";
            errorNumber++; //1
            foreach (ListItem item in ListItems)
            {
                errorNumber++; //2,3,4
                returnstring += "Desc: " + item.itemTitle + "; Price: " + item.itemPrice.ToString() + "; ";
            }
            errorNumber++; //5
            return "{ \"Status\" : \"Success\", \"Message\" : \"Your request has been successfully posted.  Well done you.  Go put the kettle on and be lazy! \", \"input\" : \"" + returnstring + ": " + errorNumber.ToString() +  "\" }";
        }
        catch (Exception ex)
        {
            Exception newEx = new Exception("Well this is quite embarassing.  It seems the badgers have escaped! (Actual error: " + ex.Message + "; error: " + errorNumber.ToString() + ")");
            throw newEx;
        }
    }

The Stringyfied field going in is:

{"ListItems":[{"title":"(Groceries) 4 pints of milk","price":"2.00"},{"title":"(Groceries) 2 loafs of bread","price":"3.00"},{"title":"(Subway) Foot Long BMT","price":"3.00"}]}

Response.d comes back as:

{ "Status" : "Success", "Message" : "Your request has been successfully posted. Well done you. Go put the kettle on and be lazy! ", "input" : "Desc: ; Price: 0; Desc: ; Price: 0; Desc: ; Price: 0; : 5" }

Any help greatly appreciated. Thanks.

have you debug it and check that you are getting data in your listItem in web service ? — Waqar Janjua
– Waqar Janjua, Commented Aug 26, 2012 at 18:23
I have and the values are not there, but what I can't work out is that fact that it always has the correct number of items in the ListItem[] array, but they are all null...I can't figure out why it would not be receiving the actual data, but still have the correct number of items in the list? — Ben Drury
– Ben Drury, Commented Aug 26, 2012 at 18:27

IUnknown · Accepted Answer · 2012-08-26 18:41:59Z

1

You are use title and price properties names on client but itemTitle and itemPrice on server. Adjust them to use same names.

answered Aug 26, 2012 at 18:41

IUnknown

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1 Comment

Ben Drury Over a year ago

Just figured that out, as you posted! Rookie error! Thanks. All working now! ** Little Embarrassed **

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