how to create drag and drop in wpf? - wpf

Question

i want drag on treevieew one and drop in treeview tow
TreeView one
<TreeView Name="tvMain" FontSize="14" Grid.Row="2" Background="#FFF9F9F9" >
<TreeView.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<EventSetter Event="MouseDoubleClick" Handler="TreeView_MouseDoubleClick" />
<EventSetter Event="MouseRightButtonDown" Handler="TreeView_MouseRightClick" />
</Style>
</TreeView.ItemContainerStyle>
<TreeView.ItemTemplate>
<HierarchicalDataTemplate >
<StackPanel Orientation="Horizontal">
<Image DragDrop.DragOver="Image_DragOver" Margin="2" Width="14" Height="14" Source="{Binding Path=ImageUrl}" HorizontalAlignment="Right" VerticalAlignment="Center" ></Image>
<TextBlock Margin="2" Text="{Binding Path=Name}" MinWidth="280" Width="{Binding Path=SizeOfName}" VerticalAlignment="Center" />
<TextBlock Name="lb_params" Text="{Binding Params}" Width="{Binding Path=SizeParams}" VerticalAlignment="Center" TextAlignment="Center"/>
</StackPanel>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
TreeView tow
<TreeView Name="tvMain" FontSize="14" Grid.Row="2" Background="#FFF9F9F9" >
<TreeView.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<EventSetter Event="MouseDoubleClick" Handler="TreeView_MouseDoubleClick" />
<EventSetter Event="MouseRightButtonDown" Handler="TreeView_MouseRightClick" />
</Style>
</TreeView.ItemContainerStyle>
<TreeView.ItemTemplate>
<HierarchicalDataTemplate >
<StackPanel Orientation="Horizontal">
<Image Margin="2" Width="14" Height="14" Source="{Binding Path=ImageUrl}" HorizontalAlignment="Right" VerticalAlignment="Center" ></Image>
<TextBlock Margin="2" Text="{Binding Path=Name}" Width="{Binding Path=SizeOfName}" VerticalAlignment="Center" />
<TextBlock Name="lb_params" Text="{Binding Params}" Width="{Binding Path=SizeParams}" VerticalAlignment="Center" TextAlignment="Center"/>
</StackPanel>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
i have tow treeview
i want drag in treeview one and drop in treeview tow in wpf?

Answer 1

To enable Drag and Drop feature in TreeView control:
Set TreeView two control’s property AllowDrop="True".
Declare three events in TreeView control, i.e. “MouseDown”, “MouseMove”,
“DragOver” and “Drop” events.
<treeview.itemcontainerstyle>
<style targettype="{x:Type TreeViewItem}">
<EventSetter Event="TreeViewItem.DragOver" Handler="treeView_DragOver"/>
<EventSetter Event="TreeViewItem.Drop" Handler="treeView_Drop"/>
<EventSetter Event="TreeViewItem.MouseMove" Handler="treeView_MouseMove"/>
<EventSetter Event="TreeViewItem.MouseDown" Handler="treeView_MouseDown"/>
</style>
</treeview.itemcontainerstyle>
And define event handlers for all the events in your xaml.cs file
Code for drop might help you.
private void treeView_MouseMove(object sender, MouseEventArgs e)
{
try
{
e.Effects = DragDropEffects.None;
e.Handled = true;
TreeViewItem TargetItem = GetNearestContainer
(e.OriginalSource as UIElement);
if (TargetItem != null && draggedItem != null )
{
_target = TargetItem;
e.Effects = DragDropEffects.Move;
} } catch (Exception) { }}