Question

我有一个DataGrid，其ItemsSource设置为自定义对象的ObservableCollection，从窗口传递到包含DataGrid的usercontrol，虽然这个工作得很好，但是我希望在两个方向都注册更改如果我点击取消按钮，则可以取消我的UserControl中所做的任何更改。

有没有办法将我在DataGrid中所做的任何更改推迟到父窗口中的ItemSource？或者相反，如果我这样选择取消更改的某种方式。任何帮助将不胜感激，这是我目前的代码;

   public UserControl1(ObservableCollection<ContourControl.RectangleContour> list1)
    {
        InitializeComponent();
        itemCollectionViewSource = (CollectionViewSource)(FindResource("ItemCollectionViewSource"));

        itemCollectionViewSource.Source = list1;

        //here i create some columns and bind the data

        DataGridViewer.ItemsSource = list1;
        DataGridViewer.AutoGenerateColumns = false;

    }

    private void Cancel(object sender, RoutedEventArgs e)
    {
        //if i click this i would like any changes to list1 to be reverted or ignored

        Window parentWindow = Window.GetWindow((DependencyObject)sender);
        if (parentWindow != null)
        {
            parentWindow.Close();
        }
    }

    private void OK(object sender, RoutedEventArgs e)
    {
        //if i click this i would like the changes to carry on to my list, as it currently does instantly

        Window parentWindow = Window.GetWindow((DependencyObject)sender);
        if (parentWindow != null)
        {
            parentWindow.Close();
        }
    }

这是启动我的usercontrol并传递原始列表的代码，我将数据存储在其中。

                Window window = new Window
            {
                Height = 200,
                Width = 765,
                Content = new UserControl1(list1: rectContourList),
            };
            window.ShowDialog();

Answer 1

您可以将UpdateSourceTrigger=Explicit设置为文本框。

 <TextBox Name="tb1" Text="{Binding tbval, UpdateSourceTrigger=Explicit}"/>

然后在＆＃34; ok＆＃34;按钮单击更新源

 private void OK_Button_Click(object sender, RoutedEventArgs e)
        {
            BindingExpression binding = tb1.GetBindingExpression(TextBox.TextProperty);
            binding.UpdateSource();
        }

并且＆＃34;取消＆＃34;如果你想在文本框中显示以前的值，只需设置上一个属性，否则你可以将它留空。

private void Cancel_Button_Click_1(object sender, RoutedEventArgs e)
        {
            //tbval is the property binded to Textbox
            tbval = tbval;
        }

https://msdn.microsoft.com/en-us/library/system.windows.data.binding.updatesourcetrigger.aspx

取消或保存对DataGrid中的自定义对象所做的更改

1 个答案: