没有泛型的运行时类型转换

Question

此代码有效。 但是注意到第 6 行和第 10 行之间的相似性，

void someThing_Click(object sender, RoutedEventArgs e)
{
    President pres;                
    if (e.GetType() == typeof(MouseButtonEventArgs))
    {
         pres = (sender as SomeUserControl ).DataContext as President;
    }
    else
    {
         pres = (sender as MenuItem ).DataContext as President;
    }
}

有没有办法缩短代码，例如，

Type t = (e.GetType() == typeof(MouseButtonEventArgs)) ? SomeUserControl : MenuItem;
pres = (sender as t).DataContext as President;

上面的代码不起作用，仅用于说明。

Answer 1

我认为不需要检查事件参数的类型等等，这应该就足够了

President pres = ((FrameworkElement)sender).DataContext as President;

Answer 2

DataContext 属性属于FrameworkElement类，即您的SomeUserControl和MenuItem继承自FrameworkElement 。 因此，您可以直接将其类型转换为FrameworkElement ：

pres = ((FrameworkElement)sender).DataContext as President;

Answer 3

直接使用FrameworkElement DataContext

var fe = sender as FrameworkElement
if(fe != null)
{
    President pres = fe.DataContext as President;
}