我有一个用于 ListView 中的列的 CellTemplate。CellTemplate 包含一个具有 ItemTemplate 的 ComboBox。ItemsSource 和 SelectedItem 都绑定到另一个 ViewModel。ListView 绑定到 ViewModel 上的 ObservableCollection。在 ListView 上方有一个工具栏,其中包含用于上下移动所选项目的按钮。I 按钮绑定到和 ICommand,这将在 ObservableCollection 上进行移动。
视图更新得很好,但是 ComboBox 中的选定项目没有使用 DataTemplate 并且只显示类型名称。
我发现如果 IsEditable = false 一切正常,但我需要这是真的。
我创建了一个验证问题的小项目。也许这是 WPF 中的一个问题。
这是 XAML:
<Window x:Class="WpfApplication3.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:WpfApplication3="clr-namespace:WpfApplication3"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<DataTemplate DataType="{x:Type WpfApplication3:Item}">
<TextBlock Text="{Binding Name}"/>
</DataTemplate>
<DataTemplate x:Key="cellTemplate">
<ComboBox ItemsSource="{Binding Items}" SelectedItem="{Binding SelectedItem}" Width="100" IsEditable="true" TextSearch.TextPath="Name"/>
</DataTemplate>
</Window.Resources>
<Grid>
<StackPanel>
<ToolBar>
<Button Content="Add" Command="{Binding AddItemCommand}"/>
<Button Content="Up" Command="{Binding MoveItemUpCommand}" CommandParameter="{Binding ElementName=listView, Path=SelectedItem}"/>
<Button Content="Down" Command="{Binding MoveItemDownCommand}" CommandParameter="{Binding ElementName=listView, Path=SelectedItem}"/>
</ToolBar>
<ListView x:Name="listView" ItemsSource="{Binding Collection}">
<ListView.View>
<GridView>
<GridViewColumn Header="Name" CellTemplate="{StaticResource cellTemplate}"/>
</GridView>
</ListView.View>
</ListView>
</StackPanel>
</Grid>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
DataContext = new ViewModel();
}
}
public class ViewModel
{
public ICommand AddItemCommand { get; private set; }
public ICommand MoveItemUpCommand { get; private set; }
public ICommand MoveItemDownCommand { get; private set; }
public ObservableCollection<Row> Collection { get; set; }
public ViewModel()
{
Collection = new ObservableCollection<Row>();
AddItemCommand = new RelayCommand(AddItem);
MoveItemUpCommand = new RelayCommand<Row>(MoveItemUp, CanMoveItemUp);
MoveItemDownCommand = new RelayCommand<Row>(MoveItemDown, CanMoveItemDown);
}
private bool CanMoveItemDown(Row arg)
{
if (arg == null)
return false;
return Collection.Last() != arg;
}
private void MoveItemDown(Row obj)
{
var index = Collection.IndexOf(obj);
Collection.Move(index, index + 1);
}
private bool CanMoveItemUp(Row arg)
{
if (arg == null)
return false;
return Collection.First() != arg;
}
private void MoveItemUp(Row row)
{
var index = Collection.IndexOf(row);
Collection.Move(index, index - 1);
}
private void AddItem()
{
Collection.Add(new Row());
}
}
public class Row
{
public Row()
{
Items = new List<Item> { new Item { Name = "Test1" }, new Item { Name = "Test2" } };
}
public List<Item> Items { get; set; }
public Item SelectedItem { get; set; }
}
public class Item
{
public string Name { get; set; }
public int Order { get; set; }
}