如何按类型获取 WPF 容器的子项? [英] How to get children of a WPF container by type?
本文介绍了如何按类型获取 WPF 容器的子项?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如何在WPF的MyContainer
Grid
中获取ComboBox
类型的子控件?
How can I get the child controls of type ComboBox
in MyContainer
Grid
in WPF?
<Grid x:Name="MyContainer">
<Label Content="Name" Name="label1" />
<Label Content="State" Name="label2" />
<ComboBox Height="23" HorizontalAlignment="Left" Name="comboBox1"/>
<ComboBox Height="23" HorizontalAlignment="Left" Name="comboBox3" />
<ComboBox Height="23" HorizontalAlignment="Left" Name="comboBox4" />
</Grid>
这一行给了我一个错误:
This line gives me an error:
var myCombobox = this.MyContainer.Children.GetType(ComboBox);
推荐答案
此扩展方法将递归搜索所需类型的子元素:
This extension method will search recursively for child elements of the desired type:
public static T GetChildOfType<T>(this DependencyObject depObj)
where T : DependencyObject
{
if (depObj == null) return null;
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
{
var child = VisualTreeHelper.GetChild(depObj, i);
var result = (child as T) ?? GetChildOfType<T>(child);
if (result != null) return result;
}
return null;
}
所以使用它你可以要求 MyContainer.GetChildOfType
.
So using that you can ask for MyContainer.GetChildOfType<ComboBox>()
.
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