c# jquery Object reference not set to an instance of an object

Question

I have a webservice in c# and I am calling it from my jquery script.

This is the webservice in c#

[WebMethod]
[ScriptMethod(UseHttpGet = true)]
public void LoadService2Daily(string fromDate, string toDate, string[] campaigns)

In script I do this:

var selectedCampaigns = $("#campaignDiv input:checkbox:checked").map(function () {
        return $(this).val();
    }).get();
    console.log(selectedCampaigns);


webServiceUrl = 'http://localhost:4025/vmp_webservice.asmx/LoadService2Daily';
$.getJSON(webServiceUrl,
      { fromDate: valFrom, toDate: valTo, campaigns: selectedCampaigns })
       .done(function (result) {

I got error 500 and when I check the response, it is Object reference not set to an instance of an object.

Note

If I removed the string[] array from the web service, it works perfectly, but when I add it, it stoped working. so I am sure it is because the string array thing but I don't know where exactly is the mistake.

The code without the array have been working for 3 years without any problem, but now I am making some editing and I need to pass that array.

This is a screenshot of the console.log to print the selectedCampgains. Notice that, as I showed you in the code, this log is taken before calling the web service

enter image description here

Edit

I noticed that the url of the web service is

Request URL:http://localhost:4025/vmp_webservice.asmx/LoadService2Daily?fromDate=2014-05-25+00%3A00%3A00&toDate=2014-05-25+23%3A59%3A01&campaigns%5B%5D=default&campaigns%5B%5D=Support

as it doesn't contain the string array, right?

Edit3

This is the whole exception that I get

System.NullReferenceException: Object reference not set to an instance of an object.
   at System.Web.Services.Protocols.ValueCollectionParameterReader.Read(NameValueCollection collection)
   at System.Web.Services.Protocols.UrlParameterReader.Read(HttpRequest request)
   at System.Web.Services.Protocols.HttpServerProtocol.ReadParameters()
   at System.Web.Services.Protocols.WebServiceHandler.CoreProcessRequest()

@SonerGönül it is not a null exception, the main problem is the 500 error. — Marco Dinatsoli
– Marco Dinatsoli, Commented May 25, 2014 at 18:37
Have you set a breakpoint and stepped through the code of the webservice to find out exactly where the error is being raised? — Rory McCrossan
– Rory McCrossan, Commented May 25, 2014 at 18:40
@RoryMcCrossan yes I already did that. but no break point executes which indicates that the web service is not called at all. I think that I am calling it wrong. right? — Marco Dinatsoli
– Marco Dinatsoli, Commented May 25, 2014 at 18:44
There is a lot going on in the selectedCampaigns variable. What is the result of the selectedCampaigns before you pass it into the server side method? Use a browser debugger to take a peek at the info. Consider something like fiddler as well to see what message is being passed to the server — Manuel Hernandez
– Manuel Hernandez, Commented May 25, 2014 at 18:45

Sunil · Accepted Answer · 2014-05-25 20:41:41Z

1

The URL which is being generated has square brackets, can you please check whether this will work without square brackets i.e without %5B and %5D(without url encoding)

http://localhost:4025/vmp_webservice.asmx/LoadService2Daily?fromDate=2014-05-25+00%3A00%3A00&toDate=2014-05-25+23%3A59%3A01&campaigns=default&campaigns=Support

answered May 25, 2014 at 20:41

Sunil

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4 Comments

Marco Dinatsoli Over a year ago

please tell me what did you do and how to fix the problem, you maject url works, but what should I do in my request to avoid these stuff that you have removed ?

Marco Dinatsoli Over a year ago

please give me an example, I really don't know.

Marco Dinatsoli Over a year ago

I will accept your answer now, +1 please could u complete your answer in my this new question about the same thing stackoverflow.com/questions/23859946/…

Sunil Over a year ago

OK I'll be doing that for you

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