基于C# wpf 实现Grid内控件拖动详情

<Button   PreviewMouseDown="Button_MouseDown" 
          PreviewMouseMove="Button_MouseMove" 
          PreviewMouseUp="Button_MouseUp"> </Button>

//鼠标是否按下
bool _isMouseDown = false;
//鼠标按下的位置
Point _mouseDownPosition;
//鼠标按下控件的Margin
Thickness _mouseDownMargin;
//鼠标按下事件
private void Button_MouseDown(object sender, MouseButtonEventArgs e)
{
 
    var c = sender as Control;
    _isMouseDown = true;
    _mouseDownPosition = e.GetPosition(this);
    _mouseDownMargin = c.Margin;
}

private void Button_MouseMove(object sender, MouseEventArgs e)
{
 
    if (_isMouseDown)
    {
 
        var c = sender as Control;
        var pos = e.GetPosition(this);
        var dp = pos - _mouseDownPosition;
        double left, top, right, bottom;
        if (c.HorizontalAlignment == HorizontalAlignment.Stretch|| c.HorizontalAlignment == HorizontalAlignment.Center)
        //中央移动距离是双倍
        {
 
            left= _mouseDownMargin.Left+ dp.X * 2;
            right = _mouseDownMargin.Right;
        }
        else if(c.HorizontalAlignment== HorizontalAlignment.Left)
        //左边是正常距离
        {
 
            left = _mouseDownMargin.Left + dp.X ;
            right = _mouseDownMargin.Right;
        }
        else
        //右边是右边距距离
        {
 
            left = _mouseDownMargin.Left;
            right = _mouseDownMargin.Right - dp.X;
        }
        if (c.VerticalAlignment == VerticalAlignment.Stretch || c.VerticalAlignment == VerticalAlignment.Center)
        //中央移动距离是双倍
        {
 
            top = _mouseDownMargin.Top+ dp.Y* 2;
            bottom = _mouseDownMargin.Bottom;
        }
        else if (c.VerticalAlignment == VerticalAlignment.Top)
        //顶部是正常距离
        {
 
            top = _mouseDownMargin.Top + dp.Y ;
            bottom = _mouseDownMargin.Bottom;
        }
        else
        //底部是底边距距离
        {
 
            top = _mouseDownMargin.Top ;
            bottom = _mouseDownMargin.Bottom- dp.Y;
        }
        c.Margin = new Thickness(left, top, right, bottom);
    }
}

private void Button_MouseUp(object sender, MouseButtonEventArgs e)
{
 
    if (_isMouseDown)
    {
 
        _isMouseDown = false;
        //移动了的控件不响应点击事件（此处根据具体需求）
        e.Handled = true;
    }
}

<Window x:Class="WpfControlMove.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:WpfControlMove"
        mc:Ignorable="d"
        Title="MainWindow" Height="360" Width="640">
    <Grid>
        <Button Width="120" Height="50" Content="移动"   PreviewMouseDown="Button_MouseDown" PreviewMouseMove="Button_MouseMove" PreviewMouseUp="Button_MouseUp"> </Button>
    </Grid>
</Window>