C# 无法检测右键单击鼠标下键和上键事件
我已经在Windows7中编写了WPF软件VS2019。 我想实现这个功能：当我右键单击鼠标并在画布中绘制一条线时，将绘制一条线，从我右键单击鼠标时开始，到我释放右键单击时结束 我尝试了很多方法，但程序似乎无法检测右键单击事件C# 无法检测右键单击鼠标下键和上键事件,c#,wpf,C#,Wpf,我已经在Windows7中编写了WPF软件VS2019。 我想实现这个功能：当我右键单击鼠标并在画布中绘制一条线时，将绘制一条线，从我右键单击鼠标时开始，到我释放右键单击时结束 我尝试了很多方法，但程序似乎无法检测右键单击事件 <UserControl x:Class="STIGenericReport.UserControl" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentati
<UserControl x:Class="STIGenericReport.UserControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Height="407" Width="633" Background="White" BorderBrush="White" Focusable="False">
<Grid Name="maingrid" Background="White" Height="405" Width="616" MinWidth="500">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="619*" />
<ColumnDefinition Width="10*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height ="574*" />
<RowDefinition Height="26" MinHeight="16" />
</Grid.RowDefinitions>
<Viewport3D Name="mainViewport" ClipToBounds = "False"
IsHitTestVisible="false"
RenderOptions.EdgeMode="Aliased" Margin="12,52,144,47">
<Viewport3D.Camera>
<OrthographicCamera x:Name="camera" Width="2"
FarPlaneDistance="10"
NearPlaneDistance="1"
LookDirection="0,0,-1"
UpDirection="0,1,0"
Position="0,0,2" />
</Viewport3D.Camera>
<Viewport3D.Children>
<ModelVisual3D x:Name="Light1">
<ModelVisual3D.Content>
<DirectionalLight Color="White" Direction="1, 1, -1" />
</ModelVisual3D.Content>
</ModelVisual3D>
<ModelVisual3D x:Name="Light2">
<ModelVisual3D.Content>
<DirectionalLight Color="White" Direction="-1, 1, -1" />
</ModelVisual3D.Content>
</ModelVisual3D>
<ModelVisual3D x:Name="Light3">
<ModelVisual3D.Content>
<DirectionalLight Color="White" Direction="0,-1,-0.5" />
</ModelVisual3D.Content>
</ModelVisual3D>
</Viewport3D.Children>
</Viewport3D>
<Canvas x:Name="canvasOn3D" Background="#00E6FFFF"
Margin="20,52,102,18"></Canvas>
<Label Content="Trayinfo &" FontSize="16" FontWeight="Bold" Height="34" HorizontalAlignment="Left" Margin="192,0,0,0" Name="lblTrayinfo" VerticalAlignment="Top" Width="194" />
<Button Height="25" HorizontalAlignment="Left" Margin="499,0,0,257" Name="btn9" VerticalAlignment="Bottom" Width="50" Background="White" BorderThickness="0" BorderBrush="White" />
<Button Height="25" HorizontalAlignment="Left" Margin="499,0,0,232" Name="btn8" VerticalAlignment="Bottom" Width="50" Background="White" BorderThickness="0" BorderBrush="White" />
<Button HorizontalAlignment="Left" Margin="499,149,0,207" Name="btn7" Width="50" Background="White" BorderThickness="0" BorderBrush="White" />
<Button Height="25" HorizontalAlignment="Left" Margin="499,0,0,182" Name="btn6" VerticalAlignment="Bottom" Width="50" Background="White" BorderThickness="0" BorderBrush="White" />
<Button Height="25" HorizontalAlignment="Left" Margin="499,0,0,157" Name="btn5" VerticalAlignment="Bottom" Width="50" Background="White" BorderThickness="0" BorderBrush="White" />
<Button Height="25" HorizontalAlignment="Left" Margin="499,0,0,132" Name="btn4" VerticalAlignment="Bottom" Width="50" Background="White" BorderThickness="0" BorderBrush="White" />
<Button Height="25" HorizontalAlignment="Left" Margin="499,0,0,107" Name="btn3" VerticalAlignment="Bottom" Width="50" Background="White" BorderThickness="0" BorderBrush="White" />
<Button Height="25" HorizontalAlignment="Left" Margin="499,0,0,82" Name="btn2" VerticalAlignment="Bottom" Width="50" Background="White" BorderThickness="0" BorderBrush="White" />
<Button Height="25" HorizontalAlignment="Left" Margin="499,0,0,57" Name="btn1" VerticalAlignment="Bottom" Width="50" Background="White" BorderThickness="0" BorderBrush="White" />
<Button Height="25" HorizontalAlignment="Left" Margin="499,0,0,282" Name="btn10" VerticalAlignment="Bottom" Width="50" Background="White" BorderThickness="0" BorderBrush="White" />
<Label Height="25" HorizontalAlignment="Right" Margin="0,0,12,57" Name="lbl1" VerticalAlignment="Bottom" Width="45" Background="White" BorderBrush="White" />
<Label Height="25" HorizontalAlignment="Right" Margin="0,0,12,82" Name="lbl2" VerticalAlignment="Bottom" Width="45" Background="White" BorderBrush="White" />
<Label Height="25" HorizontalAlignment="Right" Margin="0,0,12,107" Name="lbl3" VerticalAlignment="Bottom" Width="45" Background="White" BorderBrush="White" />
<Label Height="25" HorizontalAlignment="Right" Margin="0,0,12,132" Name="lbl4" VerticalAlignment="Bottom" Width="45" Background="White" BorderBrush="White" />
<Label Height="25" HorizontalAlignment="Right" Margin="0,0,12,157" Name="lbl5" VerticalAlignment="Bottom" Width="45" Background="White" BorderBrush="White" />
<Label Height="25" HorizontalAlignment="Right" Margin="0,0,12,182" Name="lbl6" VerticalAlignment="Bottom" Width="45" Background="White" BorderBrush="White" />
<Label Height="25" HorizontalAlignment="Right" Margin="0,0,12,207" Name="lbl7" VerticalAlignment="Bottom" Width="45" Background="White" BorderBrush="White" />
<Label Height="25" HorizontalAlignment="Right" Margin="0,0,12,232" Name="lbl8" VerticalAlignment="Bottom" Width="45" Background="White" BorderBrush="White" />
<Label Height="25" HorizontalAlignment="Right" Margin="0,0,12,257" Name="lbl9" VerticalAlignment="Bottom" Width="45" Background="White" BorderBrush="White" />
<Label Height="25" HorizontalAlignment="Right" Margin="0,0,12,282" Name="lbl10" VerticalAlignment="Bottom" Width="45" Background="White" BorderBrush="White" />
<Label Content="Pacakage info" HorizontalAlignment="Center" Width="Auto" Height="32" Name="lblPkgname" FontSize="16" FontWeight="Bold" Margin="300,0,191,347" />
</Grid>
当我调试这个程序时，当我右键单击鼠标时，它不会进入这个功能。Previewmouserightbuttondown即使在一个简单的实验中也似乎不起作用 您的代码中也有一些奇怪之处 鼠标的坐标应该基于画布（大概是这样） 下面是一些更简单的工作标记和代码 在Mainwindow中，我刚刚在默认网格中添加了一个画布：
<Grid>
<Canvas
Name="lineCanvas"
Background="Transparent"
PreviewMouseDown="lineCanvas_PreviewMouseDown"
PreviewMouseUp="lineCanvas_PreviewMouseUp"
>
</Canvas>
</Grid>
请注意，在我们的地图编辑器中，我对绘制直线进行了类似的处理，我在鼠标轮后面添加了一条“橡皮筋”临时线，显示该线的终点。这会再次向用户保证正在发生某些事情。你可能想考虑这个方法。但是左按钮工作？否则，您可能会忘记设置画布的背景属性。它不会在空背景下获取鼠标输入。是的，左键工作。在我的例子中，空背景是什么意思？但是您已经附加了处理程序方法？在您的XAML中没有类似的内容。请通过提供所有相关细节来帮助我们。您已经使用边距布置了所有控件，可能是通过在设计器表面上拖动它们来实现的。这是一种非常糟糕的工作方式。您可以很容易地让控件彼此重叠。您应该使用网格中的列和行来排列内容。使用stackpanels来承载一组控件需要一个接一个地排列。PreviewMouseRightButtonDown/up对我来说很好。没有明显的理由不应该这样做。奇怪。可能取决于驱动程序。您有多个画布？这和你的问题有什么关系？
<Grid>
<Canvas
Name="lineCanvas"
Background="Transparent"
PreviewMouseDown="lineCanvas_PreviewMouseDown"
PreviewMouseUp="lineCanvas_PreviewMouseUp"
>
</Canvas>
</Grid>
public MainWindow()
{
InitializeComponent();
}
Point startPoint = new Point();
private void lineCanvas_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
if (e.ChangedButton == MouseButton.Right)
{
startPoint = Mouse.GetPosition(lineCanvas);
}
}
private void lineCanvas_PreviewMouseUp(object sender, MouseButtonEventArgs e)
{
if (startPoint.X == 0 && startPoint.Y == 0)
{
return;
}
var currentPoint = Mouse.GetPosition(lineCanvas);
Line line = new Line();
line.Stroke = SystemColors.WindowFrameBrush;
line.X1 = startPoint.X;
line.Y1 = startPoint.Y;
line.X2 = currentPoint.X;
line.Y2 = currentPoint.Y;
line.StrokeThickness = 2;
lineCanvas.Children.Add(line);
startPoint = new Point();
}