How do I edit my code to return this webservice method in json format.

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Hi,

I'm new to all these, I want to actually consume this webservice method from my widget to display out the events. My widget is consuming in JSON format, and I've heard that I need to ensure that the value returned in the web service mehod is in JSON format. So I would like to know which are the parts that I need to change.

Thank you very very much in advance.

C#

[WebMethod(EnableSession = true, Description = "Typical Web Method")]
public List<string> retrieveEvents()
{
    List<string> retrievedData = new List<string>();
    try
    {
       using (SPSite oSPSite = new SPSite("http:....."))
       {
          SPList list = oSPWeb.Lists.TryGetList("Calendar");
          SPQuery query = new SPQuery();
          
          query.Query = "<Where><And><Geq><FieldRef Name='EventDate' /><Value          Type='DateTime'>" + SPUtility.CreateISO8601DateTimeFromSystemDateTime(DateTime.Today) + "</Value></Geq> + <Leq><FieldRef Name='EndDate' /><Value Type='DateTime'>" + SPUtility.CreateISO8601DateTimeFromSystemDateTime(DateTime.Today) + "</Value></Leq></And></Where>";
                        // query.ExpandRecurrence = true;                     
                        query.ViewFields = @"<FieldRef Name='Title' /><FieldRef Name='EventDate' /><FieldRef Name='EndDate' /><FieldRef Name='Location' />";
                        SPListItemCollection items = list.GetItems(query);
                        foreach (SPListItem listItem in items)
                        {
                            retrievedData.Add(listItem["Title"].ToString());
                            retrievedData.Add(listItem["EventDate"].ToString());
                            retrievedData.Add(listItem["EndDate"].ToString());
                            retrievedData.Add(listItem["Location"].ToString());
                        }
                        return retrievedData;
                    }
                }

            }
            catch (Exception ex)
            {

            }
            return retrievedData;

        }

Posted 1-Jan-14 15:21pm

Member 10498134

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2 solutions

Solution 1

I believe this will do it:

C#

// you need to reference System.Web.Extensions

using System.Web.Script.Serialization;
var jsonSerialiser = new JavaScriptSerializer();
var json = jsonSerialiser.Serialize(aList);

Taken from http://stackoverflow.com/questions/9110724/serializing-a-list-to-json[^]

Posted 1-Jan-14 15:40pm

ZurdoDev

Comments

Member 10498134 1-Jan-14 21:58pm

Thank you for your feedback! Sorry to ask but what about the javascript script side? I'll have to use something like $ajax?

ZurdoDev 1-Jan-14 22:00pm

Yes, you can call it with $.ajax. If you are in control of the client side though you can return it in any format you want, I would think.

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BK 4 code · Accepted Answer · 2014-01-01T17:45:00

To get a pure json format, you can use javascript serializer like below.

public class WebService1 : System.Web.Services.WebService
    {
        [WebMethod]
        [ScriptMethod(UseHttpGet=true ,ResponseFormat = ResponseFormat.Json)]
        public void HelloWorld()
        {
            JavaScriptSerializer js = new JavaScriptSerializer();
            Context.Response.Clear();
            Context.Response.ContentType = "application/json";           
         
             Context.Response.Write(js.Serialize(retrievedData));


        }
    }

Yes at javascript side code you need to set

dataType: "json"

$.ajax({
    type: "POST",
    contentType: "application/json; charset=utf-8",
    url: "YourWebServiceName.asmx/HelloWorld",
    data: "{''}",
    dataType: "json",
    success: function (msg) {
        
        OnSucessCallBack(data);
    },
    error: function (xhr, status, error) {
        alert(xhr.statusText);
    }
});