DragnDrop from Avalonia app to OS file system (Desktop, etc)

[followLemmi]

Is there any possibility in Avalonia to drag and drop a file from the Avalonia application to the Windows desktop?

[KrzysztofDusko]

Avalonia -> filesytem not opposite ?

[maxkatz6]

DragDrop.DoDragDrop for that. But you need to do it from pointer event handler, like pointer pressed.

[followLemmi]

private async void FileList_OnCellPointerPressed(object? sender, PointerPressedEventArgs e)
{
        var fileModel = (e.Source as Control)!.DataContext as FileModel;
        var dataObject = new DataObject();
        var filePaths = new[] { fileModel.FullPath };
        Console.WriteLine($"Files to drop {fileModel.FullPath}");
        dataObject.Set(DataFormats.Files, filePaths);
        
        
        var dragDrop = await DragDrop.DoDragDrop(e, dataObject, DragDropEffects.Copy);
}

If I drop file to Windows desktop from Avalonia app like this, Windows freeze about few seconds and after reload self UI. File not dropped to desktop. I pretty shure that i doing something wrong, but i cant find any solution

[maxkatz6]

DataFormats.Files doesn't expect file paths, but IEnumerable<IStorageItem>.
If you want to drop file paths, use DataFormats.FileNames.

[followLemmi]

Which type of IEnumerable<?> DataFormats.Files expected for?

[maxkatz6]

Sorry, github ate my generics... IEnumerable<IStorageItem> it is.

[maxkatz6]

Which can be obtained using StorageProvider API. It is necessary in sandboxed environments, where application don't have plain access to the file system. Like, browser, mobile or app-store macOS apps.

[followLemmi]

Many thanks to you=)

[followLemmi]

@maxkatz6 does this solution work for MacOS? When I launched the same working solution on MacOS, the DnD event is initiated, but when I try to transfer it, for example, to Finder, nothing happens

[laonzh]

same too.

[Bodekaer]

DragDrop.DoDragDrop for that. But you need to do it from pointer event handler, like pointer pressed.

I've been trying this, however the MacOS accepts only Text and not Files data format. Basically no matter which file of IStorage array/list I provide, it's like the MacOS just ignores/doesn't accept it.

Can anyone provide a quick code example or documentation link? @maxkatz6 perhaps?

[pawn86]

Hello, I'm a beginner with Avalonia. I've been trying to implement file drag-and-drop to Windows 10 File Explorer, but it's not working—no files appear at the drop target.Can you help me. Can’t wait to hear back from you!

[timunie]

Have you set AllowDrop in the XAML and have you made sure that your Main void in Program.cs is [STAThread] annotated?

[pawn86]

Have you set AllowDrop in the XAML and have you made sure that your Main void in Program.cs is [STAThread] annotated?
Hi, Thank you reply. Allow Drop is not recognized in DataGrid.
[STAThread]
public static void Main(string[] args) => BuildAvaloniaApp()
.StartWithClassicDesktopLifetime(args);

[timunie]

It's probably an attached property. Try DragDrop.AllowDrop

[pawn86]

It's probably an attached property. Try DragDrop.AllowDrop

<DataGrid
    AreRowDetailsFrozen="True"
    Background="Gray"
    ColumnHeaderHeight="35"
    DragDrop.AllowDrop="True"
    GridLinesVisibility="All"
    HorizontalGridLinesBrush="DodgerBlue"
    ItemsSource="{Binding NotifyView}"
    PointerMoved="InputElement_OnPointerMoved"
    VerticalGridLinesBrush="DodgerBlue">
    <DataGrid.Columns>
        <DataGridTextColumn
            Width="100"
            Binding="{Binding Id}"
            Header="编号" />
        <DataGridTextColumn
            Width="*"
            Binding="{Binding Path}"
            Header="路径" />
    </DataGrid.Columns>
</DataGrid>  It‘s not working. I don't know why. Could you help me?