C＃UWP如何獲取更改后的ComboBoxItem的值

Question

在我的.xaml文件中，我的組合框如下：

<ComboBox Name="CLengthCombo" SelectionChanged="ComboBox_SelectionChanged"> <ComboBoxItem Content="24"/> <ComboBoxItem Content="25"/> <ComboBoxItem Content="26" IsSelected="True"/> <ComboBoxItem Content="27"/> </ComboBox>如何實現ComboBox_SelectionChanged事件，以便獲得應用程序運行時用戶更改的comboBoxItem的內容？ 在這種情況下，即使使用SelectionChanged事件也是正確的嗎？ 以下內容不起作用：

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

Answer 1

你可以像下面這樣

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

您可以使用組合框的SelectedItem屬性

(CLengthCombo.SelectedItem as ComboBoxItem).Content

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

Answer 3

獲取您的組合框以使其正常工作，c。（...）具有SelectedItem，SelectedText ...：

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

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