我有一個串列視圖：
<ListView x:Name="All_Staging_ListView"
SelectionMode="Single"
SelectionChanged="All_Staging_ListView_SelectionChanged"
ItemTemplate="{StaticResource All_Staging_ListView_Template}"
BorderThickness="3"
BorderBrush="#005986"
HorizontalAlignment="Stretch"/>
我有一個 ListView 的 DataTemplate：
<Page.Resources>
<DataTemplate x:Key="All_Staging_ListView_Template" x:DataType="local1:All_Staging_Data_Collection_ViewEdit">
<Border BorderBrush="Aqua" BorderThickness="1" Padding="5" Margin="5">
<Grid>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Row="0" Grid.Column="0" Text="{x:Bind Metric_ID}" x:Phase="1" FontWeight="ExtraBold" Margin="0,0,5,0"/>
<TextBlock Grid.Row="0" Grid.Column="1" Grid.ColumnSpan="2" Text="{x:Bind Period}" Margin="0,0,0,0"/>
<TextBlock Grid.Row="0" Grid.Column="3" Text="{x:Bind ID}" Margin="25,0,0,0"/>
<Button Grid.Row="0" Grid.RowSpan="2" Grid.Column="4" x:Name="ButtonListViewEdit" Content="Edit this metric" Margin="20,0,0,0" Visibility="Collapsed" Click="ButtonListViewEdit_Click"/>
<TextBlock Grid.Row="1" Grid.Column="0" Text="Name:" FontWeight="Bold" />
<TextBlock Grid.Row="1" Grid.Column="1" Text="{x:Bind Metric_Name}" x:Phase="1" Margin="0,0,20,0"/>
<TextBlock Grid.Row="1" Grid.Column="2" Text="Product:" FontWeight="Bold"/>
<TextBlock Grid.Row="1" Grid.Column="3" Text="{x:Bind Product}"/>
<TextBlock Grid.Row="2" Grid.Column="0" Text="Definition:" FontWeight="Bold"/>
<TextBlock Grid.Row="2" Grid.Column="1" Text="{x:Bind Metric_Definition}" x:Phase="1" Margin="0,0,20,0"/>
<TextBlock Grid.Row="2" Grid.Column="2" Text="Company:" FontWeight="Bold" />
<TextBlock Grid.Row="2" Grid.Column="3" Text="{x:Bind Company}"/>
<TextBlock Grid.Row="3" Grid.Column="0" Text="Goal:" FontWeight="Bold"/>
<TextBlock Grid.Row="3" Grid.Column="1" Text="{x:Bind Goal_Description}" x:Phase="1" Margin="0,0,20,0"/>
<TextBlock Grid.Row="3" Grid.Column="2" Text="System:" FontWeight="Bold"/>
<TextBlock Grid.Row="3" Grid.Column="3" Text="{x:Bind System}"/>
</Grid>
</Border>
</DataTemplate>
</Page.Resources>
當 ListView 中的專案被“選中”時，我想讓按鈕“ButtonListViewEdit”可見！！！！！！編輯：（我想讓所選專案中的按鈕僅可見，而不是在 ListView 中的其他未選中專案中）。
我不知道在“SelectionChanged”事件處理程式中參考資料模板中按鈕的語法：
private void All_Staging_ListView_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
All_Staging_Data_Collection_ViewEdit listitem = new All_Staging_Data_Collection_ViewEdit();
listitem = (All_Staging_Data_Collection_ViewEdit)All_Staging_ListView.SelectedItem;
Debug.WriteLine($"ListView > SelectionChanged > Metric ID: {listitem.Metric_ID}");
}
我能夠訪問系結文本塊的值，但不能訪問按鈕（使其可見）。
感謝stackoverflow的成員提前為您提供幫助。
uj5u.com熱心網友回復：
Visibility將 的屬性系結Button到您的All_Staging_Data_Collection_ViewEdit類的屬性或獲取對在事件處理程式中Button使用該類的參考：VisualTreeHelper
private void All_Staging_ListView_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
foreach (object selectedItem in e.AddedItems)
DisplayOrHideButton(selectedItem, true);
foreach (object selectedItem in e.RemovedItems)
DisplayOrHideButton(selectedItem, false);
}
private void DisplayOrHideButton(object item, bool display)
{
ListViewItem container = All_Staging_ListView.ContainerFromItem(item) as ListViewItem;
if (container != null)
{
Button button = FindVisualChild<Button>(container);
if (button != null)
button.Visibility = display ? Visibility.Visible : Visibility.Collapsed;
}
}
private static T FindVisualChild<T>(DependencyObject obj) where T : DependencyObject
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i )
{
DependencyObject child = VisualTreeHelper.GetChild(obj, i);
if (child != null && child is T t)
return t;
else
{
T childOfChild = FindVisualChild<T>(child);
if (childOfChild != null)
return childOfChild;
}
}
return null;
}
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