Selector.SelectionChanged 事件

定義

發生於 Selector 的選取範圍變更時。Occurs when the selection of a Selector changes.

public:
 event System::Windows::Controls::SelectionChangedEventHandler ^ SelectionChanged;
public event System.Windows.Controls.SelectionChangedEventHandler SelectionChanged;
member this.SelectionChanged : System.Windows.Controls.SelectionChangedEventHandler 
Public Custom Event SelectionChanged As SelectionChangedEventHandler 

範例

下列範例顯示如何將 SelectionChanged 事件附加至清單方塊控制項。The following example shows how to attach the SelectionChanged event to a list box control.

<TextBox Name="tb" Width="140" Height="30"></TextBox>
<ListBox Name="lb" Width="100" Height="55" SelectionChanged="PrintText" SelectionMode="Single">
  <ListBoxItem>Item 1</ListBoxItem>
  <ListBoxItem>Item 2</ListBoxItem>
  <ListBoxItem>Item 3</ListBoxItem>
  <ListBoxItem>Item 4</ListBoxItem>
  <ListBoxItem>Item 5</ListBoxItem>
  <ListBoxItem>Item 6</ListBoxItem>
  <ListBoxItem>Item 7</ListBoxItem>
  <ListBoxItem>Item 8</ListBoxItem>
  <ListBoxItem>Item 9</ListBoxItem>
  <ListBoxItem>Item 10</ListBoxItem>
</ListBox>

下列範例顯示如何處理 SelectionChanged 事件。The following example shows how to handle the SelectionChanged event.

void PrintText(object sender, SelectionChangedEventArgs args)
{
    ListBoxItem lbi = ((sender as ListBox).SelectedItem as ListBoxItem);
    tb.Text = "   You selected " + lbi.Content.ToString() + ".";
}
Private Sub PrintText(ByVal sender As Object, ByVal e As SelectionChangedEventArgs)

    Dim lbsender As ListBox
    Dim li As ListBoxItem

    lbsender = CType(sender, ListBox)
    li = CType(lbsender.SelectedItem, ListBoxItem)
    tb.Text = "   You selected " & li.Content.ToString & "."
End Sub

備註

當選取專案變更時,就會發生此事件。This event occurs whenever there is a change to a selection. 除了使用者互動之外,也可以透過系結和其他設定值來變更選取範圍。A selection can be changed not only by user interaction but also by binding as well as other set values.

路由事件資訊Routed Event Information

識別碼欄位Identifier field SelectionChangedEvent
路由策略Routing strategy 路由Bubbling
Delegate - 委派Delegate SelectionChangedEventHandler

適用於