Question

我想从数据库中获取一些数据，并用UserControls显示它们。这是我要处理的代码：

for (int i = 0; i < 20; i++)
{
    uc[i] = new UCMovieItem();
    uc[i].HorizontalAlignment = HorizontalAlignment.Right;
    uc[i].VerticalAlignment = VerticalAlignment.Top;
    uc[i].Margin = new Thickness(0, 10, 10, 0);
    uc[i].Cursor = Cursors.Hand;
    mainWrapPanel.Children.Add(uc[i]);
}

UCMovieItem是UserControl

现在，我需要做的是，当用户单击其中任何一个UserControls时，我想检测单击了哪个按钮以显示一条消息，其中显示了已创建的UserControl的数量。 / p>

例如：：如果用户点击了us[5]，我想处理包含以下代码的事件：

MessageBox.Show(i);

现在我有一些问题：

如何处理for语句中每个USerControl的事件？
如何检测用户单击了哪个UserControl？
如何将i变量传递给clicked空隙以显示为消息？

Answer 1

假设您不知道命令，但是需要在代码中添加click事件处理程序，如下所示：

uc[i] = new UCMovieItem();
uc[i].HorizontalAlignment = HorizontalAlignment.Right;
uc[i].VerticalAlignment = VerticalAlignment.Top;
uc[i].Margin = new Thickness(0, 10, 10, 0);
uc[i].Cursor = Cursors.Hand;Button btn1 = new Button();
uc[i].Click += btn_Click;


//separate method
private void btn_Click(object sender, RoutedEventArgs e)
{
   int index = 0;
   for (int i = 0; i < uc.Length; i++) // determine which index the button has in a loop
   {
        if ((sender as Button) == uc[i])
        {
            index = i;
            MessageBox.Show(i);
        }
   }
   //do your stuff here

}

Answer 2

您可以尝试使用 lambda ，例如

for (int i = 0; i < 20; i++)
{
    uc[i] = new UCMovieItem();
    ...
    mainWrapPanel.Children.Add(uc[i]);

    // little trick: we don't want to pass "i" to Clicked 
    // which will be "20" after the loop completed
    // but its local copy which will be 0..19 
    int number = i;

    // event handler as lambda
    uc[i].Clicked += (o, e) => {
      // Control itself will be passed explicitly
      UCMovieItem controlClicked = (o as UCMovieItem); 

      MessageBox.Show(number.ToString()); 
    }  
}

如何处理n个UserControls的事件

2 个答案: