C# 如何用鼠标移动面板中的控件

当鼠标位于边界控制线之外时，我无法移动边界控制线

<Window
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:WpfApplication2"
  x:Class="WpfApplication2.MainWindow"
  x:Name="Window"
  Title="Window1"
  Width="346.5" Height="215" WindowStyle="SingleBorderWindow" >

    <Grid Name="stack" >

        <Border x:Name="btn" Width="50" Height="20" VerticalAlignment="Top" BorderThickness="1" BorderBrush="Black" Background="#FFF50000"
                MouseMove="btn_MouseMove" MouseDown="btn_MouseDown" MouseUp="btn_MouseUp"  />
    </Grid>
</Window> 

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因为鼠标处于边框控件中时会触发鼠标移动事件。我认为您需要为窗口添加鼠标移动事件，而不是为边框控制添加鼠标移动事件，因为当鼠标处于边框控制时，会触发鼠标移动事件。我认为您需要为窗口添加鼠标移动事件，而不是边界控制

只要在边界内捕获鼠标，并在任务完成后释放鼠标，否则它会粘住。或者根据您的代码，可能是这样->

bool state = false;
Point prePoint;

private void btn_MouseMove(object sender, MouseEventArgs e)
{
if (state)
{
    Point p = e.GetPosition(this);
    Point p2 = e.GetPosition(btn);
    btn.Margin = new Thickness(0, p.Y - p2.Y + p.Y - prePoint.Y, 0, 0);
    prePoint = e.GetPosition(this);
    // Capture Mouse here ! as far as i think. !!!
    Mouse.Capture(this.ColorPlane, CaptureMode.Element);
}
else
{
    // Release Mouse here ! as far as i think. !!!
    Mouse.Capture(null);
}
}

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只需在鼠标位于边界内时捕获鼠标，并在任务完成后释放鼠标，否则它将粘住。或者根据您的代码，可能是这样->

bool state = false;
Point prePoint;

private void btn_MouseMove(object sender, MouseEventArgs e)
{
if (state)
{
    Point p = e.GetPosition(this);
    Point p2 = e.GetPosition(btn);
    btn.Margin = new Thickness(0, p.Y - p2.Y + p.Y - prePoint.Y, 0, 0);
    prePoint = e.GetPosition(this);
    // Capture Mouse here ! as far as i think. !!!
    Mouse.Capture(this.ColorPlane, CaptureMode.Element);
}
else
{
    // Release Mouse here ! as far as i think. !!!
    Mouse.Capture(null);
}
}

---

在Windows窗体应用程序中，尽管按下鼠标按钮时鼠标处于不受控制的状态，但仍会激发鼠标事件。在Windows窗体应用程序中，尽管按下鼠标按钮时鼠标处于不受控制的状态，但仍会激发鼠标事件。