[英]how to add a click handler to dynamic created button in c# wpf (an object is not created)
by using the code below(code1) i created a dynamic stack panel to add buttons by an option file generated from before to my program but i wonder how to add click listener to each button generated since i cant create an object from each button. 通过使用下面的代码(代码1),我创建了一个动态堆栈面板,以通过从之前生成的选项文件向我的程序添加按钮,但是我不知道如何将点击侦听器添加到生成的每个按钮,因为我无法从每个按钮创建对象。
i tried adding click listener by using the mentioned code (code2) but it was not a success and also i tend to go throw the controls and find each button but i got null refrence exception (code 3) 我尝试通过使用提到的代码(code2)添加点击侦听器,但未成功,而且我倾向于抛出控件并找到每个按钮,但我得到了null异常(代码3)
//code1
StackPanel option_row = new StackPanel();
option_row.Name = "option_row" + i.ToString();
option_row.Children.Add(
new Button
{
Name = "write_btn" + i.ToString(),
VerticalAlignment = VerticalAlignment.Top,
Margin = new Thickness(5),
Content = "Write",
Height = 55,
Width = 80
}
);
//code2
option_row.Children.Add(
new Button
{
Name = "write_btn" + i.ToString(),
VerticalAlignment = VerticalAlignment.Top,
Margin = new Thickness(5),
Content = "Write",
Height = 55,
Width = 80
}.Click += new RoutedEventHandler(home_read_click)
);
private void home_read_click(object sender, RoutedEventArgs e)
{
Button btn = sender as Button;
}
//code3
private void btn_sorter()
{
for (int i = 0; i < options_num; i++)
{
StackPanel x =(StackPanel) FindName("option_row" + i.ToString());
foreach (Button item in x.Children)
{
if (item.Name.Contains("read"))
{
home_read_buttons[i] = item.Name;
}
else if (item.Name.Contains("write"))
{
home_write_buttons[i] = item.Name;
}
}
}
}
erors in code 2: The best overloaded method match for 代码2中的错误:最佳重载方法匹配
System.Windows.Controls.UIElementCollection.Add(System.Windows.UIElement)' has some invalid arguments
Argument 1: cannot convert from 'void' to 'System.Windows.UIElement'
you should create Button object at first, then assign it to 'option_row.Children' like this: 您应该首先创建Button对象,然后将其分配给'option_row.Children',如下所示:
var btn = new Button
{
Name = "write_btn" + i.ToString(),
VerticalAlignment = VerticalAlignment.Top,
Margin = new Thickness(5),
Content = "Write",
Height = 55,
Width = 80
};
btn.Click += new RoutedEventHandler(home_read_click);
option_row.Children.Add(btn);
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