WPF:获取控件内的子项

一、界面内容(部分:仅供参考)

<Window>
    <Window.Resources>

        <!--工具数据源-->
        <XmlDataProvider x:Key="toolsDS" Source="ConfigToolsTools.xml" XPath="Tools/Tool"></XmlDataProvider>
        <!--Tool模板-->
        <HierarchicalDataTemplate DataType="Tool" ItemsSource="{Binding XPath=Tool}" >
            <StackPanel  Orientation="Vertical" VerticalAlignment="Center" Margin="0,10,0,0"   > <!--MouseEnter="MenuItemImage_MouseEnter"  MouseLeave="MenuItemImage_MouseLeave"-->
                <TextBlock Tag ="{Binding XPath=@Name}" Width="38" Height="38" Margin="0,0,0,0" VerticalAlignment="Center" >
                <Image  x:Name="img_menuIcon" MouseEnter="MenuItemImage_MouseEnter"  MouseLeave="MenuItemImage_MouseLeave"   Source="{Binding XPath=@ImagePath0}"   ><!--Width="38" Height="38"--></Image>
                </TextBlock>
                <TextBlock x:Name="img_Title" Text ="{Binding XPath=@Title}" VerticalAlignment="Center" HorizontalAlignment="Center" TextAlignment="Center" Margin="0,3,0,0" Foreground="#FFD1D1D1" FontSize="{Binding XPath=@FontSize}" MouseEnter="MenuItemText_MouseEnter"  MouseLeave="MenuItemText_MouseLeave"  >
                </TextBlock>
            </StackPanel>
        </HierarchicalDataTemplate>


    </Window.Resources>


    <StackPanel x:Name="StackBlist" Orientation="Vertical" MenuItem.Click="MenuItem_Click"   VerticalAlignment="Top" Background="#43464f">
        <Button x:Name="btnOS" Click="btnOS_Click" Width="88" Height="26" Margin="-2,-2,-2,0" Background="#FF939393" BorderBrush="{x:Null}" Foreground="{x:Null}" BorderThickness="0"
                    PreviewMouseLeftButtonDown="StackBlist_PreviewMouseLeftButtonDown"
                    PreviewMouseLeftButtonUp="StackBlist_PreviewMouseLeftButtonUp" HorizontalAlignment="Center" VerticalAlignment="Center" Style="{x:Null}" IsEnabled="True" IsHitTestVisible="True" IsManipulationEnabled="False">
                    <!--PreviewMouseMove="StackBlist_PreviewMouseMove"-->
            <Image x:Name="ImgOsCanvas" Source="/DrawTool;component/Images/铺展.png"  Height="20"></Image>

            <Button.Template>
                <ControlTemplate TargetType="Button">
                    <Grid Background="#939393">
                        <Image x:Name="ImgOsCanvas" Source="/DrawTool;component/Images/铺展.png" Width="88" Height="20"></Image>
                    </Grid>
                </ControlTemplate>

            </Button.Template>

        </Button>
        <!--<TextBlock Height="10" Margin="0,0,0,0" Background="#43464f">
        </TextBlock>-->
        <Menu x:Name="menuTools" ItemsSource="{Binding Source={StaticResource ResourceKey= toolsDS}}"  Background="Transparent" ></Menu>
         
    </StackPanel>
    
</Window>

二、获取元素的所有子元素

        /// <summary>  
        /// 获得指定元素的所有子元素  
        /// </summary>  
        /// <typeparam name="T"></typeparam>  
        /// <param name="obj"></param>  
        /// <returns></returns>  
        public List<T> GetChildObjects<T>(DependencyObject obj) where T : FrameworkElement
        {
            DependencyObject child = null;
            List<T> childList = new List<T>();

            for (int i = 0; i <= VisualTreeHelper.GetChildrenCount(obj) - 1; i++)
            {
                child = VisualTreeHelper.GetChild(obj, i);

                if (child is T)
                {
                    childList.Add((T)child);
                }
                childList.AddRange(GetChildObjects<T>(child));
            }
            return childList;
        }  

　　如：获取Menu的所有MenuItem项

 List<System.Windows.Controls.MenuItem> mis = GetChildObjects<System.Windows.Controls.MenuItem>(this.menuTools);

三、更改菜单项内容

　　1、简便的方式：

List<Image> images = GetChildObjects<Image>(mi);

　　2、（比较笨的方法:按照ViasualTree图，一步步找的）

        /// <summary>
        /// 设置菜单项的图标、标题
        /// </summary>
        /// <param name="mi">菜单项</param>
        /// <param name="isConnected">是否已连接</param>
        /// <param name="title"></param>
        /// <param name="flag"></param>
        /// <returns></returns>
        private bool SetMenuContent(System.Windows.Controls.MenuItem mi,bool isConnected,string title = null,int flag = 0)
        {
            bool isSuccess = true;
            try
            {
                XmlElement xe = mi.Header as XmlElement;
                _selectedXelmt = xe;
                string front = @"pack://application:,,,";
                string menuItemTitle = xe.Attributes["Title"].Value;
                string imgPath = front + xe.Attributes["ImagePath"].Value;
                string imgPath0 = front + xe.Attributes["ImagePath0"].Value;
                int index = 3;
                DependencyObject dpdcyObj = VisualTreeHelper.GetChild(mi, 0);
                switch (flag)
                { 
                    case 0:
                        index = 3;
                        break;
                    case 1:
                        index = 2;
                        break;
                    default:
                        break;
                }
                DependencyObject dpdcyObj1 = VisualTreeHelper.GetChild(dpdcyObj, index);    //menuItem 1,   子项是2
                DependencyObject dpdcyObj2 = VisualTreeHelper.GetChild(dpdcyObj1, 0);
                DependencyObject dpdcyObj3 = VisualTreeHelper.GetChild(dpdcyObj2, 0);
                DependencyObject dpdcyObj4_1 = VisualTreeHelper.GetChild(dpdcyObj3, 0);
                DependencyObject dpdcyObj4_2 = VisualTreeHelper.GetChild(dpdcyObj3, 1);
                TextBlock tb = dpdcyObj4_2 as TextBlock;
                if (isConnected && !string.IsNullOrEmpty(title))
                {
                    tb.Text = title;
                }
                else
                {
                    tb.Text = menuItemTitle;
                }
                //System.Windows.Forms.MessageBox.Show(tb.Text);
                DependencyObject dpdcyObj5 = VisualTreeHelper.GetChild(dpdcyObj4_1, 0);
                DependencyObject dpdcyObj6 = VisualTreeHelper.GetChild(dpdcyObj5, 0);
                Image img = dpdcyObj6 as Image;
                if (isConnected)
                {
                    //string srcPath = img.Source.ToString().Replace("0", string.Empty);
                    //img.Source = new BitmapImage(new System.Uri(srcPath));
                    img.Source = new BitmapImage(new System.Uri(imgPath));
                }
                else
                {
                    img.Source = new BitmapImage(new System.Uri(imgPath0));
                }
                //System.Windows.Forms.MessageBox.Show(img.ToString());
                isSuccess = true;
            }
            catch (Exception ex)
            {
                isSuccess = false;
            }

            return isSuccess;
        }