WebView2 Unable to cast COM object of type

[jadav1982]

I am getting below error.

System.InvalidCastException
HResult=0x80004002
Message=Unable to cast COM object of type 'System.__ComObject' to interface type 'Microsoft.Web.WebView2.Core.Raw.ICoreWebView2Controller'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{7CCC5C7F-8351-4572-9077-9C1C80913835}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).
Source=mscorlib
StackTrace:
at System.StubHelpers.StubHelpers.GetCOMIPFromRCW(Object objSrc, IntPtr pCPCMD, IntPtr& ppTarget, Boolean& pfNeedsRelease)
at Microsoft.Web.WebView2.Core.Raw.ICoreWebView2Controller.Close()
at Microsoft.Web.WebView2.Core.CoreWebView2Controller.Close()
at Microsoft.Web.WebView2.WinForms.WebView2.Dispose(Boolean disposing)
at System.ComponentModel.Component.Finalize()

AB#38123381

[hunkydoryrepair]

This happened for me when clicking the Events button.

[HoldenPCaulfield]

I have this issue as well. Does anyone know what to do with this error?

[jadav1982]

@hunkydoryrepair and @HoldenPCaulfield I have move in CefSharp control

[HoldenPCaulfield]

@hunkydoryrepair and @HoldenPCaulfield I have move in CefSharp control

What?

[jadav1982]

@HoldenPCaulfield Now i am using cefsharp control

https://cefsharp.github.io/

[champnic]

For those still hitting this issue, can you add info about what version of the SDK you are using, as well as what version of the WebView2 Runtime/Edge Browser? Thanks!

[HoldenPCaulfield]

I have this issue. I split out the project: WebView2WindowsFormsBrowser into a separate solution. This project has the issue. I am not an expert in C#, .Net nor COM, however I have been programming for 50+ years.
I have made it work, actually, but needed to put a Try-Catch block around the code at:
private void SubscribeToAllEventsOnObject(string name, object target)
{
int i = 0;
foreach (EventInfo eventInfo in target.GetType().GetEvents())
{
i+=1;
tweet("Name: " + name);
EventHandlerContext context = new EventHandlerContext(this, name + eventInfo.Name);
MethodInfo methodInfo = context.GetType().GetMethod("HandleEvent");
Delegate handler = Delegate.
(eventInfo.EventHandlerType, context, methodInfo);
try
{
eventInfo.AddEventHandler(target, handler);
}
catch(Exception e)
{
tweet(e.Message); // tweet is my code to show what is going on
}
}
}
Here is a snippet of the error:

. I am so pleased. Here is my platform on Windows 10::
_> Microsoft Visual Studio Community 2019

Version 16.8.3
VisualStudio.16.Release/16.8.3+30804.86
Microsoft .NET Framework
Version 4.8.04084

Installed Version: Community

Visual C++ 2019 00435-60000-00000-AA210
Microsoft Visual C++ 2019_

cheers fellow programmers. Trying to figure wtf Delegates are. lol.

[HoldenPCaulfield]

Here is another screen clip of a trace when the delegates are assigned:

[champnic]

@HoldenPCaulfield "Tweet" is a much better name for that type of function than regular "log"! 👍

It looks like it's failing to find the CoreWebView2.WebResourceResponseReceived and CoreWebView2.DOMContentLoaded events. Those are both relatively new events, so my guess is you just need to use a newer version of the runtimethat has support for those. Can you try installing Microsoft Edge Canary or Dev?
https://www.microsoftedgeinsider.com/en-us/download/

[HoldenPCaulfield]

Hi Nic: Many thanks for responding to my post at GitHub. I appreciate your help. I downloaded Canary and re-ran the demo app: WebView2WindowsFormsBrowser. I get the same faults when I click on Events on the BrowserForm screen. See here: [cid:image001.png@01D6E533.C52FB820] Essentially, the sample application works okay, but the EventMonitor form seems to have issues. The WebView2 component I am using is as follows: [cid:image003.png@01D6E534.03A4F250] . Further thoughts are welcome, Tim From: Nic Champagne Williamson [MSFT] <notifications@github.com> Sent: Thursday, January 7, 2021 6:05 PM To: MicrosoftEdge/WebView2Samples <WebView2Samples@noreply.github.com> Cc: HoldenPCaulfield <p.timothy@live.com>; Mention <mention@noreply.github.com> Subject: Re: [MicrosoftEdge/WebView2Samples] WebView2 Unable to cast COM object of type (#67) @HoldenPCaulfield<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FHoldenPCaulfield&data=04%7C01%7C%7C54e79e88262f4e01520108d8b360b713%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637456575248637154%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=E7mwDauZDHOmxDsitomFX5Sj9Bf8TiSHAVGMN%2BXcTnQ%3D&reserved=0> "Tweet" is a much better name for that type of function than regular "log"! 👍 It looks like it's failing to find the CoreWebView2.WebResourceResponseReceived and CoreWebView2.DOMContentLoaded events. Those are both relatively new events, so my guess is you just need to use a newer version of the runtimethat has support for those. Can you try installing Microsoft Edge Canary or Dev? https://www.microsoftedgeinsider.com/en-us/download/<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.microsoftedgeinsider.com%2Fen-us%2Fdownload%2F&data=04%7C01%7C%7C54e79e88262f4e01520108d8b360b713%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637456575248637154%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3D6zaO9c2HBHxceA1kmPmKM2d4M883fhMRJtvvgJDRk%3D&reserved=0> — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FMicrosoftEdge%2FWebView2Samples%2Fissues%2F67%23issuecomment-756440185&data=04%7C01%7C%7C54e79e88262f4e01520108d8b360b713%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637456575248647115%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=v2dJzKgO7xG0HeeTNJJHQIBCZc8qAIZNtWqgiQFTHPQ%3D&reserved=0>, or unsubscribe<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fnotifications%2Funsubscribe-auth%2FAKUDQDY2U55R2FYEY63PK3TSYY43JANCNFSM4UL3RUNA&data=04%7C01%7C%7C54e79e88262f4e01520108d8b360b713%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637456575248647115%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=hwqWT%2B5vkQF8zwkshP5Easv3%2BNfYU5XFP3Ztz%2FMJWK8%3D&reserved=0>.

[champnic]

@HoldenPCaulfield The images were unable to load (maybe because of email) - if you respond directly on github.com you should be able to include the images again.

If the sample app continues to work fine and it's just reporting there was an exception, I think that may be By Design as expected exceptions while doing feature detection. I'll file a bug on our backlog to take a closer look though. Thanks for the report!

[HoldenPCaulfield]

Here is a snip of where I get a fault. It seems to me that there issues in the EventMonitor class/form with the lists and with obtaining references to the WebView2 methods and properties.

[jeremy-marcus]

Is there any update on this exception? I'm seeing this myself with the latest (stable) version.

System.InvalidCastException: Unable to cast COM object of type 'System.__ComObject' to interface type 'Microsoft.Web.WebView2.Core.Raw.ICoreWebView2Controller'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{4D00C0D1-9434-4EB6-8078-8697A560334F}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).
   at System.StubHelpers.StubHelpers.GetCOMIPFromRCW(Object objSrc, IntPtr pCPCMD, IntPtr& ppTarget, Boolean& pfNeedsRelease)
   at Microsoft.Web.WebView2.Core.Raw.ICoreWebView2Controller.get_CoreWebView2()
   at Microsoft.Web.WebView2.Core.CoreWebView2Controller.get_CoreWebView2()
   at Microsoft.Web.WebView2.Wpf.WebView2.Uninitialize(Boolean browserCrashed)
   at Microsoft.Web.WebView2.Wpf.WebView2.Dispose(Boolean disposing)