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。
