我刚刚陷入了将 ItemsControl 中的集合与包含有界 ComboBox 的 ItemTeplate 绑定(bind)的问题。
在我的场景中,我需要“生成”表单,其中包括集合中每个项目的文本框和组合框,并让用户更新项目。我可以使用 DataGrid 来实现此目的,但我希望在编辑模式下查看所有行,因此我将 ItemsControl 与自定义 ItemTemplate 一起使用。
编辑文本框是可以的,但是当您尝试更改任何组合框时,其他行中的所有其他组合框也会更改。 这是错误还是功能?
谢谢,翁德雷
Window.xaml
<Window x:Class="ComboInItemsControlSample.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="480" Width="640">
<Window.Resources>
<CollectionViewSource x:Key="cvsComboSource"
Source="{Binding Path=AvailableItemTypes}" />
<DataTemplate x:Key="ItemTemplate">
<Border BorderBrush="Black" BorderThickness="0.5" Margin="2">
<Grid Margin="3">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*" />
<ColumnDefinition Width="20" />
<ColumnDefinition Width="1*" />
</Grid.ColumnDefinitions>
<TextBox Grid.Column="0" Text="{Binding Path=ItemValue}" />
<ComboBox Grid.Column="2"
SelectedValue="{Binding Path=ItemType}"
ItemsSource="{Binding Source={StaticResource cvsComboSource}}"
DisplayMemberPath="Name"
SelectedValuePath="Value" />
</Grid>
</Border>
</DataTemplate>
</Window.Resources>
<Grid>
<ItemsControl ItemsSource="{Binding Path=SampleItems}"
ItemTemplate="{StaticResource ItemTemplate}"
Margin="10" />
</Grid>
Window.xaml.cs
public partial class Window1 : Window
{
public Window1()
{
InitializeComponent();
DataContext = new ViewModel();
}
}
public class ViewModel
{
public ViewModel()
{
SampleItems = new List<SampleItem> {
new SampleItem { ItemValue = "Value 1" },
new SampleItem { ItemValue = "Value 2" },
new SampleItem { ItemValue = "Value 3" }
};
AvailableItemTypes = new List<SampleItemType> {
new SampleItemType { Name = "Type 1", Value = 1 },
new SampleItemType { Name = "Type 2", Value = 2 },
new SampleItemType { Name = "Type 3", Value = 3 },
new SampleItemType { Name = "Type 4", Value = 4 }
};
}
public IList<SampleItem> SampleItems { get; private set; }
public IList<SampleItemType> AvailableItemTypes { get; private set; }
}
public class SampleItem : ObservableObject
{
private string _itemValue;
private int _itemType;
public string ItemValue
{
get { return _itemValue; }
set { _itemValue = value; RaisePropertyChanged("ItemValue"); }
}
public int ItemType
{
get { return _itemType; }
set { _itemType = value; RaisePropertyChanged("ItemType"); }
}
}
public class SampleItemType : ObservableObject
{
private string _name;
private int _value;
public string Name
{
get { return _name; }
set { _name = value; RaisePropertyChanged("Name"); }
}
public int Value
{
get { return _value; }
set { _value = value; RaisePropertyChanged("Value"); }
}
}
public abstract class ObservableObject : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
protected void RaisePropertyChanged(string propertyName) {
var handler = PropertyChanged;
if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
}
}
图片
最佳答案
我相信这是因为您绑定(bind)到了 CollectionViewSource
,它跟踪当前项目。尝试直接绑定(bind)到您的列表,这不会跟踪当前项目
<ComboBox Grid.Column="2"
SelectedValue="{Binding Path=ItemType}"
DisplayMemberPath="Name"
SelectedValuePath="Value"
ItemsSource="{Binding RelativeSource={
RelativeSource AncestorType={x:Type ItemsControl}},
Path=DataContext.AvailableItemTypes}" />
关于wpf - ItemsControl 包含 ItemTemplate 中绑定(bind)的 ComboBox,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/8987781/