ASP.NET jQuery error: Unknown Web Method and Unable debug aspx web form app with visual studio 2019

Question

i have this simple ajax call from client-side : this is in the TestPage.aspx

<%@ Page Language="C#"%>
<%@ Import Namespace="System.Web.Services" %>

<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="utf-8" />
    <title>Piece Of Cake </title>
    <link rel="stylesheet" type="text/css" href="../css/navigation.css">
    <link rel="stylesheet" type="text/css" href="../css/form.css">
    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
    <script type="text/javascript" src="../javascript/validateForm.js"></script>
    <script type="text/javascript" src="../javascript/effects.js"></script>
    <script>  
        $(document).ready(function () {          
            $.ajax({
                type: "POST",
                url: "TestPage/GetName/",
                contentType: "application/json; charset=utf-8;",
                dataType: "json",
                success: function (response) {
                    alert("success")
                },
                failure: function (response) {
                    alert("failure")
                },
                error: ErrorOccur
            });
        });
        function ErrorOccur(data, status, req) {
            alert("error:"+req.responseText + " " + status);
        }
 </script>
</head>

now in the TestPage.aspx.cs file i have :

namespace Foo.html
{
     
    public partial class TestPage : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            var t = 0;
        }

        [WebMethod]
        public static string GetName()
        {
            var chk = new check
            {
                subject = "hello! ",
                description = "13 Years Old"
            };
            return JsonConvert.SerializeObject(chk);
        }
        public class check
        {
            public string subject { get; set; }
            public string description { get; set; }
        }
    }
}

I can debug the cs files like the "RouteConfig.cs" in the app.
but looks like i have a problem debugging the web forms part.
When i try to debug the app after setting breakpoints in the GetName and Page_Load methods the debugger never reaches them. the app running but l keep getting the ajax error that says:

error:undefined parsererror

im using the IIS express ( which comes with VS )
all debug are set in web.config :

<compilation debug="true" targetFramework="4.7.2" />

why i can't debug the app?
why it never reaches GetName method?

UPDATE
I changed the javascript error callback and now im getting the error:

unknown web method GetName

is this page using Master Pages? i.e. has a MasterPageFile attribute? — kshkarin
– kshkarin, Commented Mar 25, 2021 at 12:16
dont think so all i see in the header is : <%@ Page Language="C#" %> <%@ Import Namespace="System.Web.Services" %> — user63898
– user63898, Commented Mar 25, 2021 at 12:33

kshkarin · Accepted Answer · 2021-03-25 13:39:45Z

0

A simple example with .NET Framework 4.7.2, the ASPX page:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="MasterLess.aspx.cs" Inherits="WebForms_DDL_Selection.MasterLess" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <script src='<%= ResolveUrl("~/Scripts/jquery-3.4.1.min.js") %>' type="text/javascript"></script>
    <form id="form1" runat="server">
        <div>
        </div>
    </form>
    <script type="text/javascript">
        $(document).ready(function () {
            var name = 'kipi';

            jQuery.ajax({
                url: '<%= ResolveUrl("MasterLess.aspx/GetName") %>',
                type: "POST",
                dataType: "json",
                data: "{'name': '" + name + "'}",
                contentType: "application/json; charset=utf-8",
                success: function (data) {
                    alert(data.d);
                }
            });
        });
    </script>
</body>
</html>

And the code behind CS:

protected void Page_Load(object sender, EventArgs e)
{

}
        
[WebMethod]
public static string GetName(string name)
{
    return "Hey there " + name;
}

In case there's a 401 error this needs to be modified in ~/App_Start/RouteConfig.cs (or the line commented out):

settings.AutoRedirectMode = RedirectMode.Off;

answered Mar 25, 2021 at 13:39

kshkarin

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13 Comments

user63898 Over a year ago

Thanks but still not working i try to add : <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="TestPage.aspx.cs"%> but i got this error after build: 1>C:\Dev\my\\project\Myproject\html\TestPage.aspx.designer.cs(12,23,12,24): error CS1001: Identifier expected

kshkarin Over a year ago

@user63898 edit the question and add the aspx code

user63898 Over a year ago

done the edit , you can see the header of the aspx page

kshkarin Over a year ago

is this a WebForms project? With ASPX pages? where are the AutoEventWireup CodeBehind and Inherits attributes on the @Page directive?

kshkarin Over a year ago

is it perhaps a website project? does this project have a global.asax file in the root?

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