C# WPF查找父控件&查找子控件

// ------------------------------------------------------------------------------------
Button btn = sender as Button;
CalibrationKey samplePointXY = btn.DataContext as CalibrationKey;

//DataGridRow row = FindVisualParent(btn);
DataGrid row = FindVisualParent(btn);

// 辅助方法：查找可视树中的父控件
private static T FindVisualParent(DependencyObject child) where T : DependencyObject
{
DependencyObject parentObject = VisualTreeHelper.GetParent(child);
if (parentObject == null) return null;

T parent = parentObject as T;
if (parent != null)
return parent;
else
return FindVisualParent(parentObject);
}
// -------------------------------------------------------------------------------------------
int channelcolorIdx = 0;
for (int i = 0; i < MyChannelNumList.Items.Count; i++)
{
// 获取第一项
var firstItem = MyChannelNumList.Items[i];

// 如果ListBox的ItemTemplate中包含Button A1
// 可以通过VisualTreeHelper查找
var listBoxItem = MyChannelNumList.ItemContainerGenerator.ContainerFromItem(firstItem) as ListBoxItem;
if (listBoxItem != null)
{
// 查找ListBoxItem中的Button A1
var btn = FindVisualChild(listBoxItem);
if (btn == null)
{
continue;
}
if (isStartFlag)
{
channelNum = int.Parse(btn.Content.ToString());
channelcolorIdx = (channelNum - 1) % AppDataContext.ChannelLineColorsList.Count();
channelColor = AppDataContext.ChannelLineColorsList[channelcolorIdx];
btn.Background = new SolidColorBrush(channelColor);
}
else
{
btn.Background = new SolidColorBrush(Colors.LightGray);
}
}
}
// 通用的查找Visual Tree中子元素的方法
private T FindVisualChild(DependencyObject depObj) where T : DependencyObject
{
if (depObj != null)
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
{
DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
if (child != null && child is T)
{
return (T)child;
}

T childItem = FindVisualChild(child);
if (childItem != null)
return childItem;
}
}
return null;
}