如何编辑列表视图/文本框中显示的集合中的值?

Question

我有一个列表视图，它显示存储在ObservableCollection类型的视图模型中的EditCollection属性。它将每个元素显示为文本框，并将字符串作为文本，这样我就可以编辑每个元素的字符串。有一个Add按钮，用于添加处理程序为AddToCollection的元素。还有一个保存按钮。点击时,EditCollection应该复制到另一个ObservableCollection性质称为集合。但是实际发生的情况是，任何添加的元素都显示出来了，但是它们的编辑值并不出现在EditCollection中，只出现它们的默认值。

private ObservableCollection<string> _editCollection;
public ObservableCollection<string> EditCollection
{
get { return _editCollection; }
set
{
_editCollection = value;
OnPropertyChanged("EditCollection");
}
}
private ObservableCollection<string> _collection;
public ObservableCollection<string> Collection
{
get { return _collection;  }
set 
{ 
_collection = value;
_editCollection = new ObservableCollection<string>(_collection);
OnPropertyChanged("Collection");
OnPropertyChanged("EditCollection");
}
}
public void Save(object item)
{
string value;
if (EditCollection.Count > 1)
{
value = EditCollection[1];
}
; // break point: value = "default value" even if I edit the textbox
Collection = new ObservableCollection<string>(new List<string>( EditCollection ));
}
public void AddToCollection(object item)
{
EditCollection.Add("default value");
OnPropertyChanged("EditCollection");
}

view.xaml

<Button Content="Save" Width="50" HorizontalAlignment="Right"
Command="{Binding SaveCommand}"/>
<ListView Grid.Row="1" ItemsSource="{Binding Path=EditCollection}">
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBox Text="{Binding Path=.,
UpdateSourceTrigger=PropertyChanged}"/>
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
<Button Grid.Row="2" Content="Add" Width="50" HorizontalAlignment="Center"
Command="{Binding AddToCollectionCommand}"/>

Answer 1

这样做的方法是绑定到一个类而不是直接绑定到字符串。

private ObservableCollection<Item> _editCollection;
public ObservableCollection<Item> EditCollection
{
get { return _editCollection; }
set
{
_editCollection = value;
OnPropertyChanged("EditCollection");
}
}
public class Item : INotifyPropertyChanged
{
private string _text;
public string Text 
{   get { return _text; }
set{ _text = value; OnPropertyChanged("Text");
}
}
<ListView Grid.Row="1" ItemsSource="{Binding Path=EditCollection}">
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBox Text="{Binding Path=Text,
UpdateSourceTrigger=PropertyChanged}"/>
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>