求助,ListView如何修改绑定后的数据
XAML 定义了一个listview

<ListView x:Name="lvwFeeds" SelectionMode="Single" ItemsSource="{Binding Mode=TwoWay}" HorizontalAlignment="Left" Height="412" Margin="129,63,0,0" VerticalAlignment="Top" Width="1109" Grid.Row="1" Foreground="Black">
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBox Height="50" TextWrapping="Wrap" Text="{Binding Title}" Width="300"/>
<TextBox Height="50" TextWrapping="Wrap" Text="{Binding Url}" Width="800"/>
<TextBlock Height="50" Width="100" Style="{StaticResource PageHeaderTextStyle}"></TextBlock>
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>


C#
在LoadState中调用以下方法
private async void LoadFeedsFromFile()
{
_categoryHelper.Get_all_categories();
foreach (Category category in _categoryHelper.Categories)
{
feeds.Add(new FeedCategory(category.Url, category.Name));
}
lvwFeeds.DataContext = feeds;
}


数据可正常显示，我修改了listview中的信息后，保存，后台取不到更改后的模型或listview的值
private void btnSaveItem_Click(object sender, RoutedEventArgs e)
{
List<Category> categories = new List<Category>();
// 取模型中的值取不到
foreach (FeedCategory feed in feeds)
{
Category category = new Category();
category.Name = feed.Title;
category.Url = feed.Url;
category.Visible = true;
categories.Add(category);
}

// 取listview的值也去不到。。。
foreach (object item in lvwFeeds.Items)
{
Category category = new Category();
category.Name = "";
category.Url = "";
category.Visible = true;
categories.Add(category);
}

_categoryHelper.Put_categories(categories);

ShowMessageDialog("保存成功", "提示");
}


feeds是这样定义的
private ObservableCollection<FeedCategory> feeds = new ObservableCollection<FeedCategory>();

FeedCategory是这样定义的
class FeedCategory : INotifyPropertyChanged
{
public FeedCategory(string url, string title)
{
Url = url;
Title = title;
}

public string _title;
public string _url;

public string Title
{
get
{
return _title;
}
set
{
_title = value;
if (PropertyChanged != null)
{
// 通知属性更改了
PropertyChanged(this, new PropertyChangedEventArgs("Title"));
}

}
}

public string Url
{
get
{
return _url;
}
set
{
_url = value;
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs("Url"));
}
}
}
public event PropertyChangedEventHandler PropertyChanged;
}

我也试过让FeedCategory继承BindableBase，也不行。

求助，感谢大家了
[最优解释]
One of the BindingMode values. The default is BindingMode.OneWay.

应该是 Text="{Binding Title , Mode=TwoWay}"


帖子发重了