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POCreate COM/ActiveXObject in C#, use from JScript, with simple event
 

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    <p>I'd like to create a COM object in C#, and use it via IDispatch from JScript. That part is pretty simple.</p> <p>I also want to implement simple callbacks on the COM object, similar to the event exposed by the XmlHttpRequest object that is usable in a browser. That model allows Javascript to attach event handlers like this: </p> <pre><code>var xmlhttp = new ActiveXObject("MSXML.XMLHTTP"); xmlhttp.onReadyStateChange = function() { ... }; </code></pre> <p>I want my client-side JScript code to look like this: </p> <pre><code>var myObject = new ActiveXObject("MyObject.ProgId"); myObject.onMyCustomEvent = function(..args here..) { ... }; </code></pre> <p>What does the C# code look like? I'd like the general case - I'd like to be able to pass arguments back to the Javascript fn. </p> <hr> <p>I've seen <a href="https://stackoverflow.com/questions/1455577/how-can-i-make-an-activex-control-written-with-c-sharp-raise-events-in-javascrip/1456714#1456714">How can I make an ActiveX control written with C# raise events in JavaScript when clicked?</a> , but the answers there look really complicated to implement, and complicated to use. </p> <hr> <p>From <a href="http://rageshkrishna.com/blog/2008/05/14/ImplementingActiveXEventsThatCanBeUsedInJavaScript.aspx" rel="nofollow noreferrer">this article</a>, it seems that XMLHttpRequest events are not COM events. The <code>onreadystatechange</code> is a property of type <code>IDispatch</code>. When script clients set that property to a function, JScript marshals it as an IDispatch object. </p> <p>The only problem that remains is then to invoke the IDispatch from C#. </p>
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