動態分配一個事件

Question

我正在動態創建一個GroupBox並嘗試將MouseLeftButtonDown事件分配給它，以便在用戶左鍵單擊它時執行一些操作。這是我已經試過：在處理方法

public MyClass() 
{ 
    tagGroupBox.MouseLeftButtonDown += new MouseButtonEventHandler(tagGroupBox_MouseLeftButtonDown); //generates error: "tagGroupBox_MouseLeftButtonDown does not exist in the current context" 
} 

private void tagGroupBox__MouseLeftButtonDown(object sender, MouseButtonEventArgs e) 
{ 
    MessageBox.Show("Left click event triggered"); 
} 

Answer 1

有__（雙下劃線）。

void tagGroupBox_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) 
{ 
} 

Answer 2

這個工作對我來說：

public partial class MainWindow : Window 
{ 
    public MainWindow() 
    { 
     InitializeComponent(); 

     GroupBox g = new GroupBox(); 
     g.MouseLeftButtonUp += new MouseButtonEventHandler(g_MouseLeftButtonUp); 
     MainGrid.Children.Add(g); 
    } 

    void g_MouseLeftButtonUp(object sender, MouseButtonEventArgs e) 
    { 
     System.Diagnostics.Debugger.Break(); 
    } 
} 

XAML

<Window x:Class="WpfApplication1.MainWindow" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    Title="MainWindow" Height="350" Width="525"> 
    <Grid x:Name="MainGrid"> 

    </Grid> 
</Window>