Avalonia/samples/ControlCatalog/Pages/DragAndDropPage.xaml

<UserControl x:Class="ControlCatalog.Pages.DragAndDropPage"
             xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <StackPanel Orientation="Vertical" Spacing="4">
    <TextBlock Classes="h2">Example of Drag+Drop capabilities</TextBlock>

    <WrapPanel HorizontalAlignment="Center">
      <StackPanel Margin="8"
                  MaxWidth="160">
        <Border Name="DragMeText"
                Padding="16"
                BorderBrush="{DynamicResource SystemAccentColor}"
                BorderThickness="2">
          <TextBlock Name="DragStateText" TextWrapping="Wrap">Drag Me (text)</TextBlock>
        </Border>
        <Border Name="DragMeFiles"
                Padding="16"
                BorderBrush="{DynamicResource SystemAccentColor}"
                BorderThickness="2">
          <TextBlock Name="DragStateFiles" TextWrapping="Wrap">Drag Me (files)</TextBlock>
        </Border>
        <Border Name="DragMeCustom"
                Padding="16"
                BorderBrush="{DynamicResource SystemAccentColor}"
                BorderThickness="2">
          <TextBlock Name="DragStateCustom" TextWrapping="Wrap">Drag Me (custom)</TextBlock>
        </Border>
        <TextBlock Name="DropState" TextWrapping="Wrap" />
      </StackPanel>

      <StackPanel Margin="8"
                  Orientation="Horizontal"
                  Spacing="16">
        <Border Name="CopyTarget"
                Padding="16"
                MaxWidth="260"
                Background="{DynamicResource SystemAccentColorDark1}"
                DragDrop.AllowDrop="True">
          <TextBlock TextWrapping="Wrap">Drop some text or files here (Copy)</TextBlock>
        </Border>
        <Border Name="MoveTarget"
                Padding="16"
                MaxWidth="260"
                Background="{DynamicResource SystemAccentColorDark1}"
                DragDrop.AllowDrop="True">
          <TextBlock TextWrapping="Wrap">Drop some text or files here (Move)</TextBlock>
        </Border>
      </StackPanel>
    </WrapPanel>
  </StackPanel>
</UserControl>