绑定到对象 ObservableCollection 中对象的属性

Question

我有一个主窗口，其中包含带有切换按钮的

DataGrid

，

DataGrid

的项目源是对象的

ObservableCollection

。我想遵循：当用户检查切换时，

IsActive2

将表示它是

set

。但现在它没有发生，我不明白为什么。

这里

MainWindow

xaml：

<Grid>
    <DataGrid ItemsSource="{Binding MyList}" AutoGenerateColumns="False">
        <DataGrid.Columns>
            <!-- Define a DataGridTemplateColumn -->
            <DataGridTemplateColumn Header="Toggle Column">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <!-- Use a ToggleButton in the cell template -->
                        <ToggleButton IsChecked="{Binding IsActive2, Mode=TwoWay}" Content="Toggle" />
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>
        </DataGrid.Columns>
    </DataGrid>
</Grid>

这里的代码：

public partial class MainWindow : Window, INotifyPropertyChanged
{
    private ObservableCollection<TestObj> _myList;
    public ObservableCollection<TestObj> MyList
    {
        get { return _myList; }
        set
        {
            _myList = value;
            OnPropertyChanged(nameof(MyList));
        }
    }

    public MainWindow()
    {
        InitializeComponent();
        MyList = new ObservableCollection<TestObj> { new TestObj(), new TestObj(), new TestObj() };
        DataContext = this;
    }
    public event PropertyChangedEventHandler PropertyChanged;
    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

这里

TestObj

：

 public class TestObj : INotifyPropertyChanged
 {
     private bool _isActive;

     public bool IsActive2
     {
         get { return _isActive; }
         set
         {
             _isActive = value;
             OnPropertyChanged(nameof(IsActive2)); 
         }
     }

     public event PropertyChangedEventHandler PropertyChanged;
     protected virtual void OnPropertyChanged(string propertyName)
     {
         PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
     }
 }

Answer 1

添加

UpdateSourceTrigger=PropertyChanged

解决了问题