如何检查 wpf C# 中鼠标按钮是左键还是右键？

Question

I'm trying this code actually I have created only one Eventhandler that is on Click="button_Click" .

XAML:

<Window x:Class="WPFAPP.Window1" 
    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:WPFAPP"
    mc:Ignorable="d"
    Title="Window1" Height="447.625" Width="562">

    <Grid>
        <Button x:Name="btn1" Content="Button1" Click="button_Click" HorizontalAlignment="Left" Margin="26,22,0,0" VerticalAlignment="Top" Width="75"/>
        <Button x:Name="btn2" Content="Button2" Click="button_Click" HorizontalAlignment="Left" Margin="26,61,0,0" VerticalAlignment="Top" Width="75"/>
        <Button x:Name="btn3" Content="Button3" Click="button_Click" HorizontalAlignment="Left" Margin="26,100,0,0" VerticalAlignment="Top" Width="75"/>
        <Button x:Name="btn4" Content="Button4" Click="button_Click" HorizontalAlignment="Left" Margin="26,137,0,0" VerticalAlignment="Top" Width="75"/>
        <Button x:Name="btn5" Content="Button5" Click="button_Click" HorizontalAlignment="Left" Margin="26,174,0,0" VerticalAlignment="Top" Width="75"/>
    </Grid>
</Window> 

Code Behind C#:

private void button_Click(object sender, RoutedEventArgs e)
{
    Button button = (Button)sender;
    if(e.Equals(Mouse.RightButton))
    {
        button.ClearValue(Button.BackgroundProperty);
        button.Background = Brushes.Green;
    } 
} 

Answer 1

Click is only designed for the most limited interaction, if you use the more advanced mouse events you then get a MouseButtonEventArgs which gives you all details about the event.

the reason for this is that Click isn't a mouse event, you could also trigger it with a touch, stylus, you can even trigger it with the keyboard by pressing Return while highlighted

so try MouseDown, MouseUp or DoubleClick instead

eg

<Button MouseDoubleClick="Button_MouseDoubleClick" >Click me</Button>

private void Button_MouseDoubleClick(object sender, MouseButtonEventArgs e)
{
    if(e.ChangedButton == MouseButton.Right)
    {
    }
    e.Handled = true;
}

or for mouse down

<Button MouseDown="Button_MouseDown" >Click me</Button>

private void Button_MouseDown(object sender, MouseButtonEventArgs e)
{
    if(e.ChangedButton == MouseButton.Right)
    {
    }
    e.Handled = true;
}

Answer 2

It's always better to have separate event handler for left and right mouse down. If you need to work as per the clicked button. Below is my approach.

<Button MouseLeftButtonDown="Button_MouseLeftButtonDown" MouseRightButtonDown="Button_MouseRightButtonDown"></Button>

Below is code behind.

private void Button_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{

}

private void Button_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
{

}

If you want to get the button which cause the event, you can check the e.OriginalSource property.

Answer 3

By using MVVM you can do for Left button Double Click on a ListView Item for example:

The Namespace to add in "Window" or "UserControl"

xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"

The ListView:

<ListView x:Name="lvComputers"
          IsSynchronizedWithCurrentItem="True"
          ...>
  <!-- Double Click -->
  <i:Interaction.Triggers>
     <i:EventTrigger EventName="MouseDoubleClick">
        <i:InvokeCommandAction Command="{Binding ListViewComputers_MouseDoubleClick}"
                               CommandParameter="{Binding ElementName=lvComputers, Path=SelectedItem}"
                               />
     </i:EventTrigger>
  </i:Interaction.Triggers>
</ListView>

and then the binded event:

private void ListViewComputers_MouseDoubleClick(object obj)
{
   //Allow only left button double click
   if (Mouse.LeftButton == MouseButtonState.Pressed)
   {
      //Code to execute on Left Button Double Click
   }
}

"Mouse" needs:

using System.Windows.Input;