WPF组件查找

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WPF组件查找

前言

有这么个需求我们有很多相同的组件，我们要获取到组件的状态，这时候我们就需要查找到所有的标记的组件，获取状态。

工具类

建议在匹配的时候使用Tag，因为Name不能重复。

同时这也能在列表中使用。

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using System.Collections.Generic;
using System.Windows;
using System.Windows.Media;

namespace ZUtils
{
  public class ZViewFinder
  {
    /// <summary>
    /// 获取第一个找到的子元素
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="parent"></param>
    /// <param name="tag"></param>
    /// <returns></returns>
    public static T FindChild<T>(DependencyObject parent, string tag) where T : DependencyObject
    {
      if (parent == null)
      {
        return null;
      }

      T foundChild = null;

      int childrenCount = VisualTreeHelper.GetChildrenCount(parent);
      for (int i = 0; i < childrenCount; i++)
      {
        DependencyObject cdo = VisualTreeHelper.GetChild(parent, i);
        if (cdo != null)
        {
          FrameworkElement child = cdo as FrameworkElement;
          if (string.IsNullOrEmpty(tag))
          {
            if (child is T)
            {
              foundChild = (T)cdo;
              break;
            }
            else
            {
              foundChild = FindChild<T>(cdo, tag);
            }
          }
          else
          {
            if (child is T && child.Tag.ToString() == tag)
            {
              foundChild = (T)cdo;
              break;
            }
            else
            {
              foundChild = FindChild<T>(cdo, tag);
            }
          }
        }
      }

      return foundChild;
    }

    /// <summary>
    /// 获取所有的子元素(支持多层)
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="parent"></param>
    /// <param name="tag"></param>
    /// <returns></returns>
    public static List<T> FindChilds<T>(DependencyObject parent, string tag) where T : DependencyObject
    {
      List<T> list = new List<T>();
      if (parent == null)
      {
        return list;
      }

      int childrenCount = VisualTreeHelper.GetChildrenCount(parent);
      for (int i = 0; i < childrenCount; i++)
      {
        DependencyObject cdo = VisualTreeHelper.GetChild(parent, i);
        if (cdo != null)
        {
          FrameworkElement child = cdo as FrameworkElement;
          if (child != null)
          {
            if (child is T)
            {
              if (string.IsNullOrEmpty(tag))
              {
                list.Add(child as T);
              }
              else if (child.Tag.ToString() == tag)
              {
                list.Add(child as T);
              }
            }
            else
            {
              // 在下一级控件中递归查找
              list.AddRange(FindChilds<T>(child, tag));
            }
          }
        }
      }

      return list;
    }

    /// <summary>
    /// 查找父元素
    /// </summary>
    /// <typeparam name="T">
    /// </typeparam>
    /// <param name="obj">
    /// </param>
    /// <param name="name">
    /// </param>
    /// <returns>
    /// </returns>
    public static T FindParent<T>(DependencyObject depobj) where T : DependencyObject
    {
      DependencyObject dobj = VisualTreeHelper.GetParent(depobj);
      if (dobj != null)
      {
        if (dobj is T)
        {
          return (T)dobj;
        }
        else
        {
          dobj = FindParent<T>(dobj);
          if (dobj != null && dobj is T)
          {
            return (T)dobj;
          }
        }
      }
      return null;
    }
  }
}

调用

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<UniformGrid
             Name="menuParent"
             Margin="16,10,16,10"
             Columns="1">
  <StackPanel Orientation="Horizontal">
    <CheckBox
              Click="menuItemClick"
              Content="教学平台"
              IsChecked="True"
              Style="{StaticResource ZCheckBoxStyle}"
              Tag="menuItem" />
  </StackPanel>
  <StackPanel Margin="30,0,0,0" Orientation="Horizontal">
    <CheckBox
              Click="menuItemClick"
              Content="个人空间"
              IsChecked="True"
              Style="{StaticResource ZCheckBoxStyle}"
              Tag="menuItem" />
    <CheckBox
              Margin="20,0,0,0"
              Click="menuItemClick"
              Content="作业讲评"
              IsChecked="True"
              Style="{StaticResource ZCheckBoxStyle}"
              Tag="menuItem" />
  </StackPanel>
</UniformGrid>

C#

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private void menuItemClick(object sender, RoutedEventArgs e)
{
  List<CheckBox> allMenu = ZViewFinder.FindChilds<CheckBox>(menuParent, "menuItem");
  for (int i = 0; i < allMenu.Count; i++)
  {
    CheckBox cb = allMenu[i];
    Console.WriteLine(cb.Content + ":" + cb.IsChecked);
  }
}