在WPF中隐藏代码列表框的ItemTemplate创建 - 第二部分(Create ItemTemp

我将其命名第二部分的这个问题，因为我已经问过类似但更简单的问题有关创建ItemTemplat在WPF的ListBox这里在为WPF ListBox中创建的ItemTemplate代码beind

现在，我要扩大我的问题。我想有一个ItemTemplate一个列表框，以便它可以有或没有绑定到一个ObservableCollection使用。

如果我不希望到的ItemsSource绑定到一个ObservableCollection我使用的代码如下：

var textBlockFactory = new FrameworkElementFactory(typeof(TextBlock));
textBlockFactory.SetValue(TextBlock.TextProperty, new Binding(".")); // Here
textBlockFactory.SetValue(TextBlock.BackgroundProperty, Brushes.Red);
textBlockFactory.SetValue(TextBlock.ForegroundProperty, Brushes.Wheat);
textBlockFactory.SetValue(TextBlock.FontSizeProperty, 18.0);

var template = new DataTemplate();            
template.VisualTree = textBlockFactory;

MyListBox.ItemTemplate = template;

但它不为的ItemsSource绑定到自TextBlock.TextProperty一个ObservableCollection必须绑定到的DisplayMemberPath属性工作。

对不起，语法错误。

首先，你需要创建一个变量，以确定状态：使用一个集合，或者只是一个字符串数组。这个标志也可以是一个依赖属性，在我的例子这是一个SomeFlag ：

private void Window_Loaded(object sender, RoutedEventArgs e)
{
    bool SomeFlag = false;

    if (SomeFlag == false)
    {
        var textBlockFactory = new FrameworkElementFactory(typeof(TextBlock));
        textBlockFactory.SetValue(TextBlock.TextProperty, new Binding("."));

        textBlockFactory.SetValue(TextBlock.BackgroundProperty, Brushes.Red);
        textBlockFactory.SetValue(TextBlock.ForegroundProperty, Brushes.Wheat);
        textBlockFactory.SetValue(TextBlock.FontSizeProperty, 18.0);

        var template = new DataTemplate();
        template.VisualTree = textBlockFactory;

        MyListBox.ItemTemplate = template;
    }
    else
    {
        MyListBox.DisplayMemberPath = "Name";
        MyListBox.SelectedValuePath = "Age";
    }
}

而对于测试，加入该处理器SelectionChanged事件：

private void MyListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    System.Diagnostics.Debug.WriteLine("SelectedValue is " + MyListBox.SelectedValue);
}

下面是一个完整的例子：

XAML

<Grid>
    <ListBox Name="MyListBox"
             SelectionChanged="MyListBox_SelectionChanged"
             ItemsSource="{Binding Path=MyCollection}" />
</Grid>

Code-behind

public partial class MainWindow : Window
{
    ViewModel MyViewModel = new ViewModel();

    public MainWindow()
    {
        InitializeComponent();

        this.DataContext = MyViewModel;

        MyViewModel.MyCollection = new ObservableCollection<Person>();

        MyViewModel.MyCollection.Add(new Person()
        {
            Age = 22,
            Name = "Nick",
        });

        MyViewModel.MyCollection.Add(new Person()
        {
            Age = 11,
            Name = "Sam",
        });

        MyViewModel.MyCollection.Add(new Person()
        {
            Name = "Kate",
            Age = 15,
        });
    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        bool SomeFlag = false;

        if (SomeFlag == false)
        {
            var textBlockFactory = new FrameworkElementFactory(typeof(TextBlock));
            textBlockFactory.SetValue(TextBlock.TextProperty, new Binding("."));

            textBlockFactory.SetValue(TextBlock.BackgroundProperty, Brushes.Red);
            textBlockFactory.SetValue(TextBlock.ForegroundProperty, Brushes.Wheat);
            textBlockFactory.SetValue(TextBlock.FontSizeProperty, 18.0);

            var template = new DataTemplate();
            template.VisualTree = textBlockFactory;

            MyListBox.ItemTemplate = template;
        }
        else
        {
            MyListBox.DisplayMemberPath = "Name";
            MyListBox.SelectedValuePath = "Age";
        }
    }

    private void MyListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        System.Diagnostics.Debug.WriteLine("SelectedValue is " + MyListBox.SelectedValue);
    }
}

public class ViewModel : NotificationObject
{
    #region MyCollection

    public ObservableCollection<Person> MyCollection
    {
        get;
        set;
    }

    #endregion
}

#region Model

public class Person
{
    public string Name
    {
        get;
        set;
    }

    public int Age
    {
        get;
        set;
    }
}

#endregion

#region NotificationObject

public class NotificationObject : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    protected void NotifyPropertyChanged(string propertyName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

#endregion