Question

我有一个DataGrid与List <>个对象（ItemsSource）相关联。在CellEditEnding ()事件中，我更改了链接对象列表的数据。要刷新DataGrid，必须对其进行刷新：

this.DataGridFieldProperties.Items.Refresh();

在CellEditEnding()事件中从代码调用更新将引发InvalidOperationException。

问题：
在CellEditEnding（）之后是否触发了一个事件？

到目前为止我尝试过的事情
多个事件，例如GotFocus，ColumnDisplayIndexChanged()等，以及双向绑定。但是它们都不可靠地工作，并在异步线程（带有DataGrid的异步事件）中刷新Task.Run()

示例

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="40"/>
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>
    <Button Name="Btn_FillGrid" Click="Btn_FillGrid_Click"/>
    <DataGrid Name="DataGrid_SOExample" Grid.Row="1" AutoGenerateColumns="False" CanUserAddRows="False" IsReadOnly="False" CellEditEnding="DataGrid_SOExample_CellEditEnding">
        <DataGrid.Columns>
            <DataGridTextColumn Header="Generic1"/>
            <DataGridTextColumn Header="Generic2"/>
        </DataGrid.Columns>
    </DataGrid>
</Grid>



public partial class Win_SOExample : Window
{
    public Win_SOExample()
    {
        InitializeComponent();
    }

    private void Btn_FillGrid_Click(object sender, RoutedEventArgs e)
    {
        List<SoExample> soExampList = new List<SoExample>();
        soExampList.Add(new SoExample() { Field1 = "Row0 Field1", Field2 = "Row0 Field2" });
        soExampList.Add(new SoExample() { Field1 = "Row1 Field1", Field2 = "Row1 Field2" });
        soExampList.Add(new SoExample() { Field1 = "Row2 Field1", Field2 = "Row2 Field2" });

        (this.DataGrid_SOExample.Columns[0] as DataGridTextColumn).Binding = new Binding("Field1") { Mode = BindingMode.TwoWay };
        (this.DataGrid_SOExample.Columns[1] as DataGridTextColumn).Binding = new Binding("Field2") { Mode = BindingMode.TwoWay };
        this.DataGrid_SOExample.ItemsSource = soExampList;
    }

    private async void DataGrid_SOExample_CellEditEnding(object sender, DataGridCellEditEndingEventArgs e)
    {
        if(e.EditAction == DataGridEditAction.Commit)
        {
            // after the user finished the edit, data in other rows needs to get updatet

            // simple example
            List<SoExample> soExampList = (this.DataGrid_SOExample.ItemsSource as List<SoExample>);
            soExampList[1].Field1 = DateTime.Now.ToLongDateString();

            await Task.Yield();
            this.DataGrid_SOExample.Items.Refresh();
        }
    }

    private class SoExample
    {
        public string Field1 { get; set; } = "";
        public string Field2 { get; set; } = "";
    }
}

Answer 1

您应在INotifyPropertyChanged类中实现SoExample：

private class SoExample : INotifyPropertyChanged
{
    private string _field1;
    public string Field1
    {
        get { return _field1; }
        set { _field1 = value; NotifyPropertyChanged(); }
    }

    private string _field2;
    public string Field2
    {
        get { return _field2; }
        set { _field2 = value; NotifyPropertyChanged(); }
    }

    public event PropertyChangedEventHandler PropertyChanged;
    private void NotifyPropertyChanged([System.Runtime.CompilerServices.CallerMemberName] String propertyName = "")
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

然后您可以将属性设置为新值而无需刷新：

private async void DataGrid_SOExample_CellEditEnding(object sender, DataGridCellEditEndingEventArgs e)
{
    if (e.EditAction == DataGridEditAction.Commit)
    {
        List<SoExample> soExampList = (this.DataGrid_SOExample.ItemsSource as List<SoExample>);
        soExampList[1].Field1 = DateTime.Now.ToLongDateString();
    }
}

DataGrid-在CellEditEnding（）之后触发的事件

1 个答案: