Drag and Drop Window in WPF

Question

Hi,
How to drag and drop wpf window, When selected title bar in top of window.

Thanks

Answer 1

Answer 2

For dragging and moving the window through TitleBar, you could try to refer to the following code
MainWindow.xaml:

<Window x:Class="DragAndDrop.MainWindow"  
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"  
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"  
        xmlns:local="clr-namespace:DragAndDrop"  
        mc:Ignorable="d" WindowStyle="None" WindowState="Normal"  
        Title="MainWindow" Height="450" Width="800">  
    <Window.Template>  
        <ControlTemplate TargetType="Window">  
            <Border BorderBrush="red" BorderThickness="3">  
                <Grid>  
                    <Grid.RowDefinitions>  
                        <RowDefinition Height="30"/>  
                        <RowDefinition Height="*"/>  
                    </Grid.RowDefinitions>  
                    <Border BorderBrush="Purple" BorderThickness="2">  
                        <TextBlock x:Name="header" Background="AliceBlue" Loaded="header_Loaded">header....</TextBlock>  
                    </Border>  

                    <ContentPresenter Grid.Row="1" />  
                </Grid>  
            </Border>  
        </ControlTemplate>  
    </Window.Template>  
    <Grid Background="LightGoldenrodYellow">  

    </Grid>  
</Window>  

MainWindow.xaml.cs:

using System.Windows;  
using System.Windows.Controls;  
using System.Windows.Input;  
namespace DragAndDrop  
{  
  public partial class MainWindow : Window  
  {  
    private bool mouseDown;  
    public MainWindow()  
    {  
      InitializeComponent();  
    }  
    private void header_Loaded(object sender, RoutedEventArgs e)  
    {  
      InitHeader(sender as TextBlock);  
    }  
    private void InitHeader(TextBlock header)  
    {  
      header.MouseUp+=new MouseButtonEventHandler(OnMouseUp);  
      header.MouseLeftButtonDown += new MouseButtonEventHandler(MouseLeftButtonDown);  
      header.MouseMove += new MouseEventHandler(OnMouseMove);  
    }  
    private void MouseLeftButtonDown(object sender, MouseButtonEventArgs e)  
    {  
      if (e.ClickCount == 2)  
      {  
        if ((ResizeMode == ResizeMode.CanResize) ||  
            (ResizeMode == ResizeMode.CanResizeWithGrip))  
        {  
          SwitchState();  
        }  
      }  
      else  
      {  
        if (WindowState == WindowState.Maximized)  
        {  
        mouseDown =true;  
        }  

        DragMove();  
    }  
  }  
    private void OnMouseUp(object sender, MouseButtonEventArgs e)  
    {  
      mouseDown=false;  
    }  
    private void OnMouseMove(object sender, MouseEventArgs e)  
    {  
      if (mouseDown)  
      {  
        var mouseX = e.GetPosition(this).X;  
        var width = RestoreBounds.Width;  
        var x = mouseX - width / 2;  

        if (x < 0)  
        {  
          x = 0;  
        }  
        else  
        if (x + width > SystemParameters.PrimaryScreenWidth)  
        {  
          x = SystemParameters.PrimaryScreenWidth - width;  
        }  
        WindowState = WindowState.Normal;  
        Left = x;  
        Top = 0;  
        DragMove();  
      }  
    }  
    private void SwitchState()  
    {  
      switch (WindowState)  
      {  
        case WindowState.Normal:  
          {  
            WindowState = WindowState.Maximized;  
            break;  
          }  
        case WindowState.Maximized:  
          {  
            WindowState = WindowState.Normal;  
            break;  
          }  
      }  
    }  
  }  
}  

The result:

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