Encountering a 500 Internal Server Error message while attempting to access a WebMethod through ajax

I'm encountering an issue with accessing my C# WebMethod in the code behind, resulting in a 500 internal server error. I cannot figure out why it's not working, so any assistance in identifying the problem would be highly appreciated.

https://i.sstatic.net/xdZYm.png

Even when data and datatype are not commented out, my ajax call doesn't seem to work.

$('#chkBxAutoCost')
    .click(function(e) {
            $.ajax({
                type: "POST",
                url:   "BatchReportCriteriaSelection.aspx/GetAutoJsonBatches",
                contentType: 'application/json; charset=utf-8',
                dataType: 'json',
                data: "{}",
                error: function(XMLHttpRequest, textStatus,    errorThrown) {
                    console.log("Request: " +
                        XMLHttpRequest.toString() +
                        "\n\nStatus: " +
                        textStatus +
                        "\n\nError: " +
                        errorThrown);
                },
                success: function() { console.log("success") }
            });
        }
    );

This is the code behind method of the page:

[WebMethod]
public string GetAutoJsonBatches()
{
    return autoJsonBatches;
}

A breakpoint set on this WebMethod is not being hit, leaving me puzzled. Any insights or suggestions would be greatly appreciated.

Answer №1

After reading botond's comments, I realized that the solution to my issue was making webmethods static! I am incredibly grateful as this problem was truly baffling me!

Answer №2

To start, make changes to RouteConfig.cs by setting

settings.AutoRedirectMode = RedirectMode.Off;

Then ensure that your method GetAutoJsonBatches() is marked as static

The reason for marking them as static is because they are completely stateless, meaning they do not create an instance of the page's class or receive any input parameters in the request (such as ViewState and form field values).

Since HTTP is inherently stateless, ASP.Net handles a lot of tasks behind the scenes with ViewState, Session, etc. during a normal page request to simplify things for developers.

Source

[WebMethod]
public static string GetAutoJsonBatches()
{
    return autoJsonBatches;
}

Answer №3

In order for this Web Service to be accessible via script with ASP.NET AJAX, you must include the

[System.Web.Script.Services.ScriptService]
attribute in your WebService code.

[System.Web.Script.Services.ScriptService]
public class WebService1 : System.Web.Services.WebService
{

    [WebMethod]
    public string GetAutoJsonBatches()
    {
        return autoJsonBatches;
    }
}

We need more information about the exception message that is being encountered.

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