沒有泛型的運行時類型轉換

Question

此代碼有效。 但是注意到第 6 行和第 10 行之間的相似性，

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;
    }
}

有沒有辦法縮短代碼，例如，

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

上面的代碼不起作用，僅用於說明。

Answer 1

我認為不需要檢查事件參數的類型等等，這應該就足夠了

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

Answer 2

DataContext 屬性屬於FrameworkElement類，即您的SomeUserControl和MenuItem繼承自FrameworkElement 。 因此，您可以直接將其類型轉換為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;
}