如何用代码选中一个DataGrid的一行

Question

大家好，我自定义了一个类（GreeningPointDataModel）然后将一个List<GreeningPointDataModel>绑定到一个DataGrid，代码如下

private void UpdateDataGridPointList(List<GreeningPointDataModel> modelList)
        {
            txtPointListCount.Text = modelList.Count.ToString();
            PagedCollectionView pagedCollectionView = new PagedCollectionView(modelList);
            pagedCollectionView.PageSize = 10;
            dataPagePointList.Source = pagedCollectionView;
            dataGridPointList.ItemsSource = pagedCollectionView;
        }

然后我在代码中获得了一个GreeningPointDataModel的实例，想通过这个实例将DataGrid上对应的一行设置为选中状态。这个如何实现？GreeningPointDataModel类中有ID选项，是唯一的。就想通过这个ID实现。

我自己写了个方法，但并不能正常工作

private void SetDataGridSelectedRow(DataGrid dataGrid, GreeningPointDataModel model)
        {
            int index = -1;
            foreach (var p in dataGrid.ItemsSource) {
                var point = p as GreeningPointDataModel;
                if (point == null) continue;
                if (point.Id == model.Id) {
                    index = dataGrid.SelectedItems.IndexOf(p);//这一行可以被执行到，但返回值仍然是-1
                    break; ;
                }
            }
            if (index != -1)
                dataGrid.SelectedIndex = index;
        }

index的值仍然是-1

Answer 1

Hi waterharbin,

根据你的描述，我写了下面的代码来选择DataGrid的行，你可以参考。

        <sdk:DataGrid x:Name="TESTDG" HorizontalAlignment="Left" Height="145" Margin="30,320,0,0" VerticalAlignment="Top" Width="320"/>
        <Button x:Name="button1" Content="Set row" HorizontalAlignment="Left" Margin="370,390,0,0" VerticalAlignment="Top" Width="75" Click="button1_Click"/>

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            SetDataGridSelectedRow(TESTDG , listauthors[2]); ;
        }

        private void SetDataGridSelectedRow(DataGrid dataGrid, Author model)
        {
            int index = -1;
            foreach (var p in dataGrid.ItemsSource)
            {
                Author point = p as Author;
                if (point == null) continue;
                if (point.ID == model.ID)
                {
                    List<Author> list = dataGrid.ItemsSource as List<Author>;
                    index = list.IndexOf(point);
                    break; ;
                }
            }
            if (index != -1)
                dataGrid.SelectedIndex = index;
        }

Best Regards,

Yohann Lu

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