I have upgraded application to .Net 6.0 ,facing TypeInitializationException: The type initializer for 'Telerik.Windows.Controls.TelerikLicense' threw an exception.

[Akshay]

Hello, I have upgraded application to .Net 6.0 ,while I trying to add DLL to toolbar then it gives following error [refer screenshot].

when I run the project it throws exception about Telerik,  as

The invocation of the constructor on type 'Telerik.Windows.Controls.RadMenu' that matches the specified binding constraints threw an exception

following inner exception

" TypeInitializationException: The type initializer for 'Telerik.Windows.Controls.TelerikLicense' threw an exception."

and

"MissingMethodException: Method not found: 'System.ActivationContext System.AppDomain.get_ActivationContext()'."

 

please suggest.

[Stenly]

Could you provide a bit more information regarding this exception? Also, is it reproducible in a sample project, or only in your main application? If it is only in your main project, could you try isolating it, so I could try to debug it on my end?

[Markus Hopfenspirger]

I had this problem too - referencing the Telerik .dlls from Binaries/WPF60 and not from Binaries/WPF45 solved it in my case...

[George]

I have the same issue.

I have upgraded an application to WPF Core .Net 6.0 and get the same error for the RadComboBox.

Is there some update on that?

[Stenly]

When migrating a project from a .Net Framework version to a .Net one (3.1 and above) an additional NuGet package would have to be manually included, which is Microsoft.Windows.Compatibility. This additional step should be performed when the Telerik assemblies are not installed via NuGet packages. If the assemblies are included via NuGet packages, there would be no need to include the Microsoft.Windows.Compatibility package.

With this in mind, may I ask if you could try including this additional package?

[Carl]

I am getting the same exception when i upgraded to .NET 7.0. Anybody knows the fix.  The above solutions didn't work for me.

[Stenly]

Could you share a sample project that reproduces this behavior? This way, I could review it on my end and let you know what could be the cause.