This function must be called from a UI thread

Using the following Microsoft web page as a reference.. https://docs.microsoft.com/en-us/windows/msix/store-developer-package-update

I am trying to write code to update a test application I have uploaded to the Microsoft Store. Uploaded to the store is a simple dialog and a few updates (changed background color) written in C# Windows Forms using a UWP wrapper in the form of a Windows Application Packaging Project.

The dialog has a couple of buttons, one of which calls the following cut/paste methods from the above webpage..

private async void InstallUpdatesAsync()  {      StoreContext updateManager = StoreContext.GetDefault();      IReadOnlyList<StorePackageUpdate> updates = await updateManager.GetAppAndOptionalStorePackageUpdatesAsync();        // Save app state here        IAsyncOperationWithProgress<StorePackageUpdateResult, StorePackageUpdateStatus> installOperation =          updateManager.RequestDownloadAndInstallStorePackageUpdatesAsync(updates);        StorePackageUpdateResult result = await installOperation.AsTask();        // Under normal circumstances, app will terminate here        // Handle error cases here using StorePackageUpdateResult from above  }  

I am getting the error..

System.Reflection.TargetInvocationException: 'Exception has been thrown by the target of an invocation.'

Inner Exception Exception: Invalid window handle.

This function must be called from a UI thread

I don't understand this as I am calling it from a button from a dialog box. I have seen various comments elsewhere that the commands have to be called from a UI thread, but I cannot find out how.

Any help much appreciated.

https://stackoverflow.com/questions/66038811/this-function-must-be-called-from-a-ui-thread February 04, 2021 at 11:04AM