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Getting 'InvalidOperationException' When Calling Async Methods in Synchronous Context in .NET 7 WPF Application

👀 Views: 68 đŸ’Ŧ Answers: 1 📅 Created: 2025-06-12
wpf .net-7 async-await C#

I keep running into I'm working with an `InvalidOperationException` with the message "The calling thread want to access this object because a different thread owns it" when trying to call an async method from a button click event handler in my WPF application built with .NET 7. Here's a snippet of the relevant code: ```csharp private void MyButton_Click(object sender, RoutedEventArgs e) { var result = MyAsyncMethod(); // This causes the exception } private async Task<string> MyAsyncMethod() { await Task.Delay(1000); return "Hello, World!"; } ``` I initially thought that I could just call the async method directly, but it seems I'm running into issues with the UI thread. I tried using `ConfigureAwait(false)`, but the exception still occurs. I considered changing the button click handler to be async, like this: ```csharp private async void MyButton_Click(object sender, RoutedEventArgs e) { var result = await MyAsyncMethod(); MessageBox.Show(result); } ``` While this does resolve the exception, I worry about the implications of using an async void method for event handlers. Is there a best practice for handling async calls in WPF without running into exceptions or causing UI thread issues? Any guidance or suggestions would be greatly appreciated! Is there a better approach?