[英]ItemsControl set ItemSource and get ContentPresenter same time
我创建了ItemsControl
:
<ItemsControl x:Name="myItemsControl">
<ItemsControl.ItemTemplate>
<DataTemplate>
<TextBlock x:Name="myTextBlock" Text="{Binding Name}" Width="75" Height="75" Margin="10" Background="Black" Foreground="White"/>
</DataTemplate>
</ItemsControl.ItemTemplate>
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
</ItemsControl>
当我同时设置ItemSource
和获取ContentPresenter
时,它给了我错误System.InvalidOperationException: 'This operation is valid only on elements that have this template applied.'
myItemsControl.ItemsSource = new List<Person>() {
new Person { Name = "1.Name?" },
new Person { Name = "2.Name?" },
new Person { Name = "3.Name?" },
new Person { Name = "4.Name?" },
new Person { Name = "5.Name?" },
}; ;
for ( int i = 0; i < myItemsControl.Items.Count; i++ ) {
ContentPresenter contentPresenter = ( ContentPresenter ) myItemsControl.ItemContainerGenerator.ContainerFromItem(myItemsControl.Items[i]);
TextBlock textBlock = contentPresenter.ContentTemplate.FindName("myTextBlock", contentPresenter) as TextBlock;
}
我知道“ItemControl”完全更新后,我需要获取“contentpresser”。 但我不知道该怎么做?
您可以在 ItemsControl 的 Loaded 事件中访问 ContentPresenter
<ItemsControl x:Name="myItemsControl" Loaded="myItemsControl_Loaded">
<ItemsControl.ItemTemplate>
<DataTemplate>
<TextBlock x:Name="myTextBlock" Text="{Binding Name}"
Width="75" Height="75" Margin="10" Background="Black" Foreground="White"/>
</DataTemplate>
</ItemsControl.ItemTemplate>
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
</ItemsControl>
像这样
private void myItemsControl_Loaded(object sender, RoutedEventArgs e)
{
for (int i = 0; i < myItemsControl.Items.Count; i++)
{
ContentPresenter contentPresenter = (ContentPresenter)myItemsControl.ItemContainerGenerator.ContainerFromItem(myItemsControl.Items[i]);
TextBlock textBlock = contentPresenter.ContentTemplate.FindName("myTextBlock", contentPresenter) as TextBlock;
textBlock.Text = "Testing";
}
}
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