//以矩形为例

//创建鼠标捕获

Mouse.Capture(rectOne);

//释放鼠标捕获

rectOne.ReleaseMouseCapture();

//获取鼠标位置

e.GetPosition(canvasOne).X

e.GetPosition(canvasOne).Y

//获取元素位置

Canvas.GetLeft(rectOne)

Canvas.GetTop(rectOne)

//设置指定元素位置等

Canvas.SetLeft(rectOne, cLeft)

Canvas.SetTop(rectOne, cTop)

public partial class MainWindow : Window

{

    public MainWindow()

    {

        InitializeComponent();

        //注册移动事件

        rectOne.MouseLeftButtonDown += rectOne_MouseLeftButtonDown;

        rectOne.MouseLeftButtonUp += rectOne_MouseLeftButtonUp;

        rectOne.MouseMove += rectOne_MouseMove;

    }

    bool enableMove = false;

    double spanLeft = ;

    double spanTop = ;

    //鼠标移动

    private void rectOne_MouseMove(object sender, MouseEventArgs e)

    {

        if (enableMove)

        {

            var cLeft = e.GetPosition(canvasOne).X - spanLeft;

            var cTop = e.GetPosition(canvasOne).Y - spanTop;

            //设置矩形的位置

            Canvas.SetLeft(rectOne, cLeft);

            Canvas.SetTop(rectOne, cTop);

        }

    }

    //鼠标松开

    private void rectOne_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)

    {

        //释放鼠标捕获

        rectOne.ReleaseMouseCapture();

        enableMove = false;

        spanLeft = spanTop = ;

    }

    //鼠标按下

    private void rectOne_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)

    {

        //创建鼠标捕获

        Mouse.Capture(rectOne);

        enableMove = true;

        spanLeft = e.GetPosition(canvasOne).X - Canvas.GetLeft(rectOne);

        spanTop = e.GetPosition(canvasOne).Y - Canvas.GetTop(rectOne);

    }

}