Calling c# asmx web service from Jquery with Response.Write JSON output

Question

I have a c# asmx web service code like below.

[WebMethod]
    [ScriptMethod(UseHttpGet = true, ResponseFormat = ResponseFormat.Json)]
    public void getPolicyDetails(string CustId, string PolicyType)
    {
        JavaScriptSerializer js = new JavaScriptSerializer();
        Context.Response.Clear();
        Context.Response.ContentType = "application/json";
        clsPolicy data = new clsPolicy();
        try
        {
            string policyTxt = "";
            //get PolicyTxt from Database
            data.Message = policyTxt.ToString();
        }
        catch (Exception ex)
        {
        }
        Context.Response.Write(js.Serialize(data));
    }

Now, I am trying to consume this web service in asp.net. This web-service is already being used in my android project successfully.

When I try to use call it via javascript, it gives me a 500 - Internal server error. Below is my Javascript code.

 function getPolicy(policyType) {
            $.ajax({
                type: "POST",
                url: "http://myurl/productsearch.asmx/getPolicyDetails",
                data: '{CustId: 106206,PolicyType: "' + policyType + '" }',
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: OnSuccess,
                failure: function (response) {
                    alert(response.d);
                }
            });
        }
        function OnSuccess(response) {
            alert(response.d);
        }

What could be the problem?

Sumit Jambhale · Accepted Answer · 2016-11-22 10:48:10Z

1

Error 500 Internal Server Error is related to the error in the webservice.

Different Methods to debug/log the error

In catch block log that error into the text file using file handling code.
Debug your webservice by attaching it to the w3wp process if you have access to the server where service is deployed and visual studio is installed on that server.
You can check the error windows event viewer

Control Panel -> Administrative tools -> Event Viewer

On left side panel expand Windows Logs and Click on application menu and find the details in the error logs related to your application

answered Nov 22, 2016 at 10:48

Sumit Jambhale

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Comments

mybirthname · Accepted Answer · 2016-11-22 05:25:08Z

0

public void getPolicyDetails(string CustId, string PolicyType)

You define CustID as string but in your json it is integer

data: '{CustId: 106206,PolicyType: "' + policyType + '" }'

Also start using JSON.stringify for create of your data.

var policyType = 'something';
var custID = '106206';
data: JSON.stringify({CustId:custID, PolicyType: policyType })

edited Nov 22, 2016 at 5:25

answered Nov 22, 2016 at 5:16

mybirthname

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4 Comments

milan m Over a year ago

Ok. Let me try with a string and reply to you.

milan m Over a year ago

Modified the code: var custid = "106206"; data: '{CustId: "' + custid + '",PolicyType: "' + policyType + '" }'.

mybirthname Over a year ago

@milanm write is using JSON.stringify like I worte it

milan m Over a year ago

Unfortunately, it is still not working. There is another webservice on the same page where I am not passing parameters and that is working absolutely fine. I am wondering what is the issue in this one?

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