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Asked: 2026-05-10T16:08:20+00:00

I’m building a simple Todo List application where I want to be able to

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I’m building a simple Todo List application where I want to be able to have multiple lists floating around my desktop that I can label and manage tasks in.

The relevant UIElements in my app are:

Window1 (Window) TodoList (User Control) TodoStackCard (User Control)

Window1 looks like this:

<Window x:Class="TaskHole.App.Window1"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     xmlns:t="clr-namespace:TaskHole.App.Controls"     xmlns:tcc="clr-namespace:TaskHole.CustomControls"     Title="Window1" Width="500" Height="500" Background="Transparent" WindowStyle="None" AllowsTransparency="True" >     <Canvas Name="maincanvas" Width="500" Height="500" VerticalAlignment="Stretch" HorizontalAlignment="Stretch">         <ResizeGrip SizeChanged="ResizeGrip_SizeChanged" />         <t:TodoList Canvas.Top="0" Canvas.Left="0" MinWidth="30" Width="50" Height="500" x:Name="todoList" TaskHover="todoList_TaskHover" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/>     </Canvas> </Window>

TodoList looks like this:

<UserControl x:Class="TaskHole.App.Controls.TodoList"         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"         xmlns:t="clr-namespace:TaskHole.App.Controls"         xmlns:tcc="clr-namespace:TaskHole.CustomControls"         Background="Transparent">     <StackPanel VerticalAlignment="Bottom" HorizontalAlignment="Stretch" MinWidth="1" Grid.Row="2" Height="Auto" AllowDrop="True">         <ItemsControl Name="todolist" ItemsSource="{Binding}">             <ItemsControl.ItemsPanel>                 <ItemsPanelTemplate>                     <VirtualizingStackPanel Name="stackPanel" VerticalAlignment="Bottom">                     </VirtualizingStackPanel>                 </ItemsPanelTemplate>             </ItemsControl.ItemsPanel>             <ItemsControl.ItemTemplate>                 <DataTemplate>                     <t:TodoStackCard x:Name="card" TaskHover="card_TaskHover" Orientation="Vertical" VerticalContentAlignment="Top" />                 </DataTemplate>             </ItemsControl.ItemTemplate>         </ItemsControl>     </StackPanel> </UserControl>

I have multiple instances of these windows, and I want to be able to drag any of the controls between the windows. I have tried using a Thumb control and, while this works, it only allows me to drag a control around the containing canvas.

How do I mimic the behaviour of, say, Windows Explorer, where I can drag a file outside of the application and onto another application, all the while seeing a ghosted representation of the file under the cursor.

Can I accomplish this purely in C# and WPF? If so/if not, how?

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1 Answer

  1. You have to call DoDragDrop to initialize the Drag And Drop framework. Jaime Rodriguez provides a guide to Drag and Drop here

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