WPF 获得DataTemplate中的控件

1、WPF 获得DataTemplate中的控件, 下面这个示例是从ListBox中获得ListBoxItem模板的控件信息。

前台代码：

<!--获得模板中的控件-->        <ListBox  Margin="12,32,0,0" IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding}" Name="listBox1" SelectedIndex="0" Height="186" VerticalAlignment="Top" HorizontalAlignment="Left" Width="287">            <ListBox.ItemTemplate>                <DataTemplate x:Name="gridDataTemplate">                              <Grid>                        <Grid.ColumnDefinitions>                            <ColumnDefinition Width="0.5*"/>                            <ColumnDefinition Width="0.5*"/>                            <ColumnDefinition Width="0.5*"/>                            <ColumnDefinition Width="0.5*"/>                        </Grid.ColumnDefinitions>                         <TextBlock Text="{Binding Path=ID}"/>                        <TextBlock Grid.Column="1" x:Name="myName" Text="{Binding Path=Name}"/>                        <TextBlock Grid.Column="2" Text="{Binding Path=Age}" Background="{Binding Path=Age, Converter={StaticResource BackgroundConverter}}"/>                        <CheckBox Grid.Column="3" x:Name="myCheckBox" IsChecked="{Binding Path= ISBoy, Converter={StaticResource BoolConverter}}"/>                    </Grid>                </DataTemplate>            </ListBox.ItemTemplate>        </ListBox>

　资源：

<Window.Resources>        <Con:BackgroundConverter x:Key="BackgroundConverter"/>        <Con:BoolConverter x:Key="BoolConverter"/> </Window.Resources>

　　

<Button Height="23" HorizontalAlignment="Left" Margin="35,251,0,0" Name="button1" VerticalAlignment="Top" Width="209" Click="button1_Click">GetControlFromDataTemplate</Button>

　　

后台代码：

public Window1()  {      InitializeComponent();           listBox1.DataContext = GetDataTable();             }

　Click事件：关键代码

private void button1_Click(object sender, RoutedEventArgs e)   {       ListBoxItem myListBoxItem = (ListBoxItem)listBox1.ItemContainerGenerator.ContainerFromItem(listBox1.SelectedItem);       ContentPresenter contentpresenter = FindFirstVisualChild<ContentPresenter>(myListBoxItem);       DataTemplate MyDataTemplate = contentpresenter.ContentTemplate;       TextBlock myTextBlock = MyDataTemplate.FindName("myName", contentpresenter) as TextBlock;       if (myTextBlock != null)       {           MessageBox.Show(myTextBlock.Text);       } }

　　

数据源：当然也可以自己连接数据库获得数据源

private DataTable  GetDataTable()      {          DataTable data = new DataTable("MyDataTable");                     DataColumn ID = new DataColumn("ID");//第一列          ID.DataType = System.Type.GetType("System.Int32");          //ID.AutoIncrement = true; //自动递增ID号          data.Columns.Add(ID);          //设置主键          DataColumn[] keys = new DataColumn[1];          keys[0] = ID;          data.PrimaryKey = keys;          data.Columns.Add(new DataColumn("Name",typeof(string)));//第二列          data.Columns.Add(new DataColumn("Age",typeof(string)));//第三列          data.Columns.Add(new DataColumn("ISBoy", typeof(Int16)));//第三列          data.Rows.Add(1,"  XiaoM","  20", 1);          data.Rows.Add(2,"  XiaoF","  122", 0);          data.Rows.Add(3,"  XiaoA", "  29", 1);          data.Rows.Add(4,"  XiaoB", "  102", 0);          return data;      }

　　

值转换：BackgroundConverter类是改变颜色，BoolConverter是将Bool互相转换Int

public class BackgroundConverter : IValueConverter    {        #region IValueConverter Members        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)        {            Color color = new Color();            int num = int.Parse(value.ToString());            if (num > 100)                color = Colors.Yellow;            else if (num < 50)                color = Colors.LightGreen;            else                color = Colors.LightPink;            return new SolidColorBrush(color);        }        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)        {            throw new NotImplementedException();        }        #endregion    }    public class BoolConverter : IValueConverter    {        #region IValueConverter Members        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)        {            bool flag = false;                        if (1 == int.Parse(value.ToString()))            {                flag = true;            }            if( 0 == int.Parse(value.ToString()))                flag = false;            return flag;        }        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)        {            if ((bool)value)            {                return 1;            }            else                return 0;        }        #endregion    }

　　

 //关键函数

public T FindFirstVisualChild2<T>(DependencyObject obj, string childName) where T : DependencyObject       {           for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)           {               DependencyObject child = VisualTreeHelper.GetChild(obj, i);               if (child != null && child is T && child.GetValue(NameProperty).ToString() == childName)               {                   return (T)child;               }               else               {                   T childOfChild = FindFirstVisualChild2<T>(child, childName);                   if (childOfChild != null)                   {                       return childOfChild;                   }               }           }           return null;       }

　　

 效果图： 当选中第一项，然后单击"GetControlFromDataTemplate"按钮，则弹出第一项中控件的内容XiaoM。