Listview删除项目索引源正在使用wpf

Question

我想从 observablecollection

中删除项目

ObservableCollection<GetterSetter> _getterSetter = new ObservableCollection<GetterSetter>();

public ObservableCollection<GetterSetter> showList
    {
        get { return this._getterSetter; }
    }

所以我的xaml文件是这样的，

<ListView x:Name="listView" Grid.Row="1" SelectionChanged="listView_SelectionChanged" Foreground="Black" ItemsSource="{Binding ListViewCollection}" SelectedItem="{Binding SelectedListViewItem,Mode=TwoWay}" SelectionMode="Single">
<ListView.View>
     <GridView>
        <GridViewColumn Header="Name" Width="180" DisplayMemberBinding="{Binding ShowName}"/>
     </GridView>

我这里有一个 ShowName getter setter，

private string _showName;

public String ShowName{
    get { return _showName; }
    set
    {
      if (value == _showName) return;
      _showName = value;
      OnPropertyChanged();
    }

我想像这样删除选定的项目，但出现错误，

listView.Items.Remove(listView.SelectedItems[0]);
showList.RemoveAt(listView.Items.IndexOf(listView.SelectedItems[0]));

我也试过这个

var delete = SelectedListViewItem;
listView.Items.Remove(delete);

并且都给了我这个错误，

An unhandled exception of type 'System.InvalidOperationException' occurred in PresentationFramework.dll

Additional information: Operation is not valid while ItemsSource is in use. Access and modify elements with ItemsControl.ItemsSource instead.

顺便说一下，GetterSetter 是我的 cs 文件，我的第三个代码片段所在的位置，

public GetterSetter SelectedListViewItem
    {
        get { return _selectedListViewItem; }
        set
        {
            if (Equals(value, _selectedListViewItem)) return;
            _selectedListViewItem = value;
            OnPropertyChanged();
        }
    }

Answer 1

正如错误所说，直接从 ItemsSource 执行。为此，您需要将 ItemsSource 区分为它的类型，然后执行删除操作。

if(SelectedListViewItem != null)
{
    // EDIT: Typo in the lambda for FirstOrDefault
    var delete = showList.FirstOrDefault(x => SelectedListViewItem.ShowName == x.ShowName);
    if(delete != null)
    {
        ((ObservableCollection<GetterSetter>)listView.ItemsSource).Remove(delete);
    }
}

编辑：NULL 怪物要抓到你了。

Listview删除项目索引源正在使用wpf

Listview Delete Item Index source is in use wpf

c#

wpf

listview

items