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實現控件拖動的基本原理是對鼠標位置的捕獲，同時根據鼠標按鍵的按下、釋放確定控件移動的幅度和時機。
簡單示例：
在Grid中有一個Button，通過鼠標事件改編Button的Margin屬性，從而改變Button在Grid中的相對位置。

<Grid Name="gd">
    <Button Width=90 Height=30 Name="btn">button</Button>
</Grid>

為Button控件綁定三個事件：鼠標按下、鼠標移動、鼠標釋放

public SystemMap()
{
      InitializeComponent();
      btn.MouseLeftButtonDown += btn_MouseLeftButtonDown;
      btn.MouseMove += btn_MouseMove;
      btn.MouseLeftButtonUp += btn_MouseLeftButtonUp;
}
 

定義變量+鼠標按下事件

Point pos = new Point();
void btn_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    Button tmp = (Button)sender;
    pos = e.GetPosition(null);
    tmp.CaptureMouse();
    tmp.Cursor = Cursors.Hand;
}

鼠標移動事件

void btn_MouseMove(object sender, MouseEventArgs e)
{
     if
 
 (e.LeftButton==MouseButtonState.Pressed)
     {
           Button tmp = (Button)sender;
           double dx = e.GetPosition(null).X - pos.X + tmp.Margin.Left;
           double dy = e.GetPosition(null).Y - pos.Y + tmp.Margin.Top;
           tmp.Margin = new Thickness(dx, dy, 0, 0);
           pos = e.GetPosition(null);
     }
}

鼠標釋放事件

void btn_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
         Button tmp = (Button)sender;
         tmp.ReleaseMouseCapture();
}

WPF實現控件拖動