wpf中在style的template寻找ControlTemplate和DataTemplate的控件

一、WPF中的两棵树 
WPF中每个控件的Template都是由ControlTemplate构成，ControlTemplate包含了构成该控件的各种子控件，这些子控件就构成了VisualTree；而在我们可见的界面，所有搭建出整个程序UI的控件构成了LoginTree。VisualTree和LoginTree相互独立，互相不可访问，每中树都有各自的方法来查找自己的子控件。 
二、寻找ControlTemplate中的控件 
首先，我们在资源中新建一个包含三个TextBox的ControlTemplate，把它赋值给一个UserControl对象；然后我们再在程序界面添加一个TextBox，在资源中引用之前把TextBox改成圆角风格的Style：

 <Window x:Class="_11_221.MainWindow"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         Title="MainWindow" Height="" Width="">
     <Window.Resources>
         <ControlTemplate x:Key="cTmp">
             <StackPanel Background="Orange">
                 <TextBox x:Name="textBox1" Margin=""/>
                 <TextBox x:Name="textBox2" Margin="6,0"/>
                 <TextBox x:Name="textBox3" Margin=""/>
             </StackPanel>
         </ControlTemplate>
         <Style BasedOn="{x:Null}" TargetType="{x:Type TextBox}" x:Key="tbstyle">
             <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
             <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"/>
             <Setter Property="BorderThickness" Value=""/>
             <Setter Property="Padding" Value=""/>
             <Setter Property="AllowDrop" Value="true"/>
             <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
             <Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst"/>
             <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
             <Setter Property="Template">
                 <Setter.Value>
                     <ControlTemplate TargetType="{x:Type TextBox}">
                         <Border x:Name="Bd" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}"  SnapsToDevicePixels="true"
                         CornerRadius="">
                             <TextBlock x:Name="textblck1" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                         </Border>
                         <ControlTemplate.Triggers>
                             <Trigger Property="IsEnabled" Value="false">
                                 <Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
                                 <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                             </Trigger>
                         </ControlTemplate.Triggers>
                     </ControlTemplate>
                 </Setter.Value>
             </Setter>
         </Style>

     </Window.Resources>
     <Grid>
         <StackPanel Background="Yellow">
             <UserControl x:Name="uc" Template="{StaticResource cTmp}" Margin=""/>
             <TextBox x:Name="tb"  Style="{StaticResource tbstyle}"/>
             <Button Content="find" Width="" Height="" Click="Button_Click"/>
         </StackPanel>
     </Grid>
 </Window>

我们实现的效果是，点击按钮，分别从UserControl和TextBox中找到构成他们的ControlTemplate，然后找到子控件并进行相关操作： 
后台代码：

 private void Button_Click(object sender, RoutedEventArgs e)
         {
             TextBox t = this.uc.Template.FindName("textBox1", this.uc) as TextBox;
             t.Text = "hello";
             StackPanel sp = t.Parent as StackPanel;
             (sp.Children[] as TextBox).Text = "hello controltemplate";
             (sp.Children[] as TextBox).Text = "find it";

             TextBlock tbl = this.tb.Template.FindName("textblck1", this.tb) as TextBlock;
             tbl.Text = "in textbox";
         }

ControlTemplate和DateTemplate都属于Template，都可以给Template进行赋值，Template中提供了一个叫做FindName的接口，可以用来寻找模板中的控件。

三、寻找DataTemplate中的控件 
首先，先定义一个用于使用DataTemplate的类Student：

 public class Student
     {
         public int Id { get; set; }
         public string Name { get; set; }
         public string Skill { get; set; }
         public bool HasJob { get; set; }
     }

XMAL代码如下：

 <Window x:Class="_11_222.MainWindow"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:local="clr-namespace:_11_222"
         Title="MainWindow" Height="" Width="">
     <Window.Resources>
         <local:Student x:Key="stu" Id=""  Name="Hyman" Skill="Linux" HasJob="True"/>
         <DataTemplate x:Key="stuDT">
             <StackPanel Orientation="Horizontal">
                 <TextBox  Name="textbox1" Text="{Binding Id}"/>
                 <TextBox  Name="textbox2" Text="{Binding Name}"/>
                 <TextBox  Name="textbox3" Text="{Binding Skill}"/>
             </StackPanel>
         </DataTemplate>
     </Window.Resources>
     <Grid>
         <StackPanel>
             <ContentPresenter x:Name="cp" Content="{StaticResource stu}" ContentTemplate="{StaticResource stuDT}" />
             <Button x:Name="button" Width="" Height=""  Click="button_Click" Content="find"/>
         </StackPanel>
     </Grid>
 </Window>

实现find按钮的处理函数，将找到的TextBox中的内容用MessageBox弹出：

 private void button_Click(object sender, RoutedEventArgs e)
         {
             TextBox tb = this.cp.ContentTemplate.FindName("textbox2", this.cp) as TextBox;
             MessageBox.Show(tb.Text);
         }

界面效果如下： 
 

转自：http://blog.csdn.net/hyman_c/article/details/52020310