我有一个包含网格的数据模板,在网格内我有一个组合框。
<DataTemplate x:Key="ShowAsExpanded">
<Grid>
<ComboBox Name ="myCombo" Grid.Column="1" HorizontalAlignment="Stretch" VerticalAlignment="Top" Margin="5"
IsSynchronizedWithCurrentItem="True"
ItemsSource="{Binding}"
ItemTemplate="{StaticResource MyItems}">
<ComboBox.ItemsPanel>
<ItemsPanelTemplate>
<VirtualizingStackPanel />
</ItemsPanelTemplate>
</ComboBox.ItemsPanel>
</ComboBox>
</Grid>
</DataTemplate>
然后我有一个通过样式引用该模板的网格。
<Grid>
<ContentPresenter Name="_contentPresenter" Style="{DynamicResource StyleWithCollapse}" Content="{Binding}" />
</Grid>
如何通过代码访问 myCombo 以基本设置其 DataContext?
最佳答案
我知道的三种方式。
1.使用FindName
ComboBox myCombo =
_contentPresenter.ContentTemplate.FindName("myCombo",
_contentPresenter) as ComboBox;
2.将 Loaded 事件添加到 ComboBox 并从那里访问它
<ComboBox Name ="myCombo" Loaded="myCombo_Loaded" ...
private void myCombo_Loaded(object sender, RoutedEventArgs e)
{
ComboBox myCombo = sender as ComboBox;
// Do things..
}
3.在可视化树中查找
private void SomeMethod()
{
ComboBox myCombo = GetVisualChild<ComboBox>(_contentPresenter);
}
private T GetVisualChild<T>(DependencyObject parent) where T : Visual
{
T child = default(T);
int numVisuals = VisualTreeHelper.GetChildrenCount(parent);
for (int i = 0; i < numVisuals; i++)
{
Visual v = (Visual)VisualTreeHelper.GetChild(parent, i);
child = v as T;
if (child == null)
{
child = GetVisualChild<T>(v);
}
if (child != null)
{
break;
}
}
return child;
}
关于c# - WPF 如何从 DataTemplate 访问控件,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/4586106/