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SelectionChangedEventArgs 類別

定義

提供 SelectionChanged 事件的資料。

public ref class SelectionChangedEventArgs : System::Windows::RoutedEventArgs
public class SelectionChangedEventArgs : System.Windows.RoutedEventArgs
type SelectionChangedEventArgs = class
    inherit RoutedEventArgs
Public Class SelectionChangedEventArgs
Inherits RoutedEventArgs
繼承
SelectionChangedEventArgs

範例

下列範例會 ListBox 建立 並訂閱 SelectionChanged 事件。 它會使用 SelectionChangedEventArgs ,在 中 ListBox 尋找選取的專案。

<WrapPanel Width="500" Orientation="Horizontal" Name="rectanglesPanel">
  <WrapPanel.Resources>
    <Style TargetType="Rectangle">
      <Setter Property="Height" Value="20"/>
      <Setter Property="Width" Value="20"/>
      <Setter Property="Margin" Value="5"/>
    </Style>
  </WrapPanel.Resources>
</WrapPanel>

<ListBox Name="myListBox" HorizontalAlignment="Left" SelectionMode="Extended" 
      Width="265" Height="55" Background="HoneyDew" SelectionChanged="myListBox_SelectionChanged"
      ItemsSource="{Binding Source={StaticResource Colors}}" IsSynchronizedWithCurrentItem="true">
</ListBox>
void myListBox_SelectionChanged(object sender, SelectionChangedEventArgs args)
{

    BrushConverter converter = new BrushConverter();

    // Show Rectangles that are the selected colors.
    foreach (string color in args.AddedItems)
    {
        if (GetRectangle(color) == null)
        {
            Rectangle aRect = new Rectangle();
            aRect.Fill = (Brush) converter.ConvertFrom(color);
            aRect.Tag = color;
            rectanglesPanel.Children.Add(aRect);
        }
    }

    // Remove the Rectangles that are the unselected colors.
    foreach (string color in args.RemovedItems)
    {
        FrameworkElement removedItem = GetRectangle(color);
        if (removedItem != null)
        {
            rectanglesPanel.Children.Remove(removedItem);
        }
    }
}

FrameworkElement GetRectangle(string color)
{
    foreach (FrameworkElement rect in rectanglesPanel.Children)
    {
        if (rect.Tag.ToString() == color)
            return rect;
    }

    return null;
}
Private Sub myListBox_SelectionChanged(ByVal sender As Object, ByVal args As SelectionChangedEventArgs)

    Dim converter As BrushConverter = New BrushConverter()
    Dim color As String

    ' Show Rectangles that are the selected colors.
    For Each color In args.AddedItems

        If GetRectangle(color) Is Nothing Then
            Dim aRect As Rectangle = New Rectangle()
            aRect.Fill = CType(converter.ConvertFrom(color), Brush)
            aRect.Tag = color
            rectanglesPanel.Children.Add(aRect)
        End If

    Next

    ' Remove the Rectangles that are the unselected colors.
    For Each color In args.RemovedItems

        Dim removedItem As FrameworkElement = GetRectangle(color)
        If Not removedItem Is Nothing Then
            rectanglesPanel.Children.Remove(removedItem)
        End If

    Next

End Sub

Private Function GetRectangle(ByVal color As String) As FrameworkElement
    Dim rect As FrameworkElement
    For Each rect In rectanglesPanel.Children
        If rect.Tag.ToString() = color Then
            Return rect
        End If
    Next

    Return Nothing
End Function

建構函式

SelectionChangedEventArgs(RoutedEvent, IList, IList)

初始化 SelectionChangedEventArgs 類別的新執行個體。

屬性

AddedItems

取得包含已選取之項目的清單。

Handled

取得或設定值,這個值表示路由事件在傳送路由時之事件處理的目前狀態。

(繼承來源 RoutedEventArgs)
OriginalSource

在父類別進行任何可能的 Source 調整之前,取得純點擊測試所判定的原始報告來源。

(繼承來源 RoutedEventArgs)
RemovedItems

取得包含未選取之項目的清單。

RoutedEvent

取得或設定與這個 RoutedEventArgs 執行個體相關聯的 RoutedEvent

(繼承來源 RoutedEventArgs)
Source

取得或設定引發事件之物件的參考。

(繼承來源 RoutedEventArgs)

方法

Equals(Object)

判斷指定的物件是否等於目前的物件。

(繼承來源 Object)
GetHashCode()

做為預設雜湊函式。

(繼承來源 Object)
GetType()

取得目前執行個體的 Type

(繼承來源 Object)
InvokeEventHandler(Delegate, Object)

執行適當的型別轉換,以呼叫 SelectionChangedEventHandler 事件的型別安全 SelectionChanged 委派。

MemberwiseClone()

建立目前 Object 的淺層複製。

(繼承來源 Object)
OnSetSource(Object)

在衍生類別中覆寫時,每當執行個體的 Source 屬性值變更,便會提供通知回呼進入點。

(繼承來源 RoutedEventArgs)
ToString()

傳回代表目前物件的字串。

(繼承來源 Object)

適用於

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