System.Runtime.InteropServices.COMException: 'Invalid window handle. (0x80070578)

[yegorisB]

Which version of the app?

WinUI 3 Gallery

Description

Source: Windows.Storage.StorageFile file = await open.PickSingleFileAsync();

VS2022: System.Runtime.InteropServices.COMException: 'Invalid window handle. (0x80070578)
Consider WindowNative, InitializeWithWindow
See https://aka.ms/cswinrt/interop#windows-sdk'

Screenshots

Windows version

Windows 11 22H2 (22621)

Additional context

Edition Windows 11 Home
Version 23H2
Installed on ‎9/‎11/‎2023
OS build 22631.2861
Experience Windows Feature Experience Pack 1000.22681.1000.0

Processor 13th Gen Intel(R) Core(TM) i9-13900H 2.60 GHz
Installed RAM 16.0 GB (15.6 GB usable)

System type 64-bit operating system, x64-based processor
Pen and touch No pen or touch input is available for this display

[yegorisB]

   Everything is all right If you use this:
   
           private async void OpenButton_Click(object sender, RoutedEventArgs e)
    {

        //https://github.com/microsoft/WindowsAppSDK/issues/1188
        //More info on obtaining the HWND
        var filePicker = new FileOpenPicker();

        // Get the current window's HWND by passing in the Window object
        var hwnd = WinRT.Interop.WindowNative.GetWindowHandle(this);

        // Associate the HWND with the file picker
        WinRT.Interop.InitializeWithWindow.Initialize(filePicker, hwnd);

        // Use file picker like normal!
        filePicker.FileTypeFilter.Add("*");
        var file = await filePicker.PickSingleFileAsync();

        if (file != null)
        {
            using (Windows.Storage.Streams.IRandomAccessStream randAccStream =
                await file.OpenAsync(Windows.Storage.FileAccessMode.Read))
            {
                // Load the file into the Document property of the RichEditBox.
                editor.Document.LoadFromStream(Microsoft.UI.Text.TextSetOptions.FormatRtf, randAccStream);
            }
        }
    }

instead of this:

    private async void OpenButton_Click(object sender, RoutedEventArgs e)
    {

        //https://github.com/microsoft/WindowsAppSDK/issues/1188
        //More info on obtaining the HWND
        var filePicker = new FileOpenPicker();

        // Get the current window's HWND by passing in the Window object
        var hwnd = WinRT.Interop.WindowNative.GetWindowHandle(this);

        // Associate the HWND with the file picker
        WinRT.Interop.InitializeWithWindow.Initialize(filePicker, hwnd);

        // Use file picker like normal!
        filePicker.FileTypeFilter.Add("*");
        var file = await filePicker.PickSingleFileAsync();

        if (file != null)
        {
            using (Windows.Storage.Streams.IRandomAccessStream randAccStream =
                await file.OpenAsync(Windows.Storage.FileAccessMode.Read))
            {
                // Load the file into the Document property of the RichEditBox.
                editor.Document.LoadFromStream(Microsoft.UI.Text.TextSetOptions.FormatRtf, randAccStream);
            }
        }
    }