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First I'd like to say that I've seen these two questions :
How to handle an ActiveX event in Javascript
How can I make an ActiveX control written with C# raise events in JavaScript when clicked?

Now I have this Test control :

interface EventsInterface
{
    [DispId(0)]
    void myEvent();
}
[ClassInterface(ClassInterfaceType.None)]
[ComSourceInterfaces(typeof(EventsInterface))]
[Guid("0002EA9A-0BAF-4A9C-8300-7E4D7D371445")]
public partial class Test : UserControl
{
    public delegate void Event();
    public event Event myEvent;
    public Test()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        myEvent();
    }
}

Which only has one button.

I'm testing the control in this html page: 

<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="utf-8" />
    <title></title>
</head>
<body>
    <object id="Control" classid="CLSID:0002EA9A-0BAF-4A9C-8300-7E4D7D371445"/>
    <script for="Control" event="myEvent()">
        alert("hello");
    </script>
</body>
</html>

When I click the button in IE 8 it's supposed to alert("hello") but instead it throws a NullPointerException that myEvent is null So this means the event handler is not set from javascript.

Why doesn't it work ? and how to make it work ?.

By the way I'm testing the page using the 64bit version of IE on windows 7.

Edit

I tried signing my assembly but it didn't work, all my googling reveals that my code is right so why isn't it working ? what should I do ?

niceman
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  • You need to declare a delegate and and event which inherit that delegate. Also, you must check before calling the delegate if it's not null to avoid NullReferenceExceptions.. See: https://learn.microsoft.com/en-us/dotnet/standard/events/ – Oscar Feb 19 '18 at 13:12
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    IE8 + ActiveX? My deepest condolences. – Andreas Feb 19 '18 at 13:12
  • @Oscar I didn't understand you, could you give me an example ? – niceman Feb 19 '18 at 13:47
  • @Andreas I could use IE 11 fortunately but there is no escape from ActiveX, condolences accepted – niceman Feb 19 '18 at 13:48

0 Answers0