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("£","") });
 });
 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.

• Waqar Janjua: have you debug it and check that you are getting data in your listItem in web service ?
• Ben Drury: 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?

Answer 1

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

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