C＃UWP怎麼去改變ComboBoxItem

Question

的價值在我的.xaml文件，我有我的組合框，如下：我如何能實現我的ComboBox_SelectionChanged事件，以便我能得到comboBoxItem的內容

<ComboBox Name="CLengthCombo" SelectionChanged="ComboBox_SelectionChanged"> <ComboBoxItem Content="24"/> <ComboBoxItem Content="25"/> <ComboBoxItem Content="26" IsSelected="True"/> <ComboBoxItem Content="27"/> </ComboBox> 這應用程序運行時用戶是否更改？在這種情況下，SelectionChanged事件是否正確使用？下面不起作用：

private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e) { string chosenItem = CLengthCombo.PlaceholderText; } 在此先感謝您的幫助！

Answer 1

你可以像下面

private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e) 
     { 
      var comboBoxItem = e.AddedItems[0] as ComboBoxItem; 
      if (comboBoxItem == null) return; 
      var content = comboBoxItem.Content as string; 
      if (content != null && content.Equals("some text")) 
      { 
       //do what ever you want 
      } 
     } 

Answer 2

您可以使用SelectedItem屬性的組合框的

(CLengthCombo.SelectedItem as ComboBoxItem).Content 

https://msdn.microsoft.com/library/windows/apps/windows.ui.xaml.controls.combobox.aspx#properties

Answer 3

讓您的組合框來解決這個角（.. ）已選SelectedItem，SelectedText ...：

private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e) 
{ 
    var c = sender as ComboBox; 

    var item = c.(...); 
}