DataGrid后台实现选中某一行，并滚动到当前选中项

定义一个DataGrid

   <DataGrid  Name="resultDataGrid"
                           VirtualizingStackPanel.IsVirtualizing="False"
                                                   AlternationCount="2" 
                                                   BorderThickness="1"
                                                   AutoGenerateColumns="False" 
                                                   CanUserAddRows="False" 
                                                   CanUserReorderColumns="False" 
                                                   CanUserResizeColumns="False" 
                                                   CanUserResizeRows="False" 
                                                   CanUserSortColumns="False"
                                                   HorizontalAlignment="Left" 
                                                   IsReadOnly="False"
                                                   ItemsSource="{Binding                                 DetectResultList,Mode=TwoWay}"
                                                   GridLinesVisibility="All"
                                                   SelectionMode="Single" >
                    <DataGrid.Columns>
                        <DataGridTextColumn Binding="{Binding ID}"  ElementStyle="{StaticResource dgCell}" Header="ID" Width="40" IsReadOnly="True" />
                    <DataGridTextColumn Binding="{Binding Pedestal_Row}"  ElementStyle="{StaticResource dgCell}" Header="x" Width="*" />
                    <DataGridTextColumn Binding="{Binding Pedestal_Col}"  ElementStyle="{StaticResource dgCell}" Header="y" Width="*" />
                    <DataGridTextColumn Binding="{Binding ErrDiscription}"  ElementStyle="{StaticResource dgCell}" Header="缺陷描述 " Width="4*" />
                    </DataGrid.Columns>
                   
                </DataGrid>

注意：  一定要设置VirtualizingStackPanel.IsVirtualizing="False"

/// <summary>
        /// 将SelectedItem滚动为第一行
        /// </summary>
        /// <param name="dataGrid">目标DagaGrid</param>
        /// <param name="selectedItem">选中项</param>
        public static void SetSelectedItemFirstRow(object dataGrid, object selectedItem)
        {
            //若目标datagrid为空，抛出异常
            if (dataGrid == null)
            {
                throw new ArgumentNullException("目标无" + dataGrid + "无法转换为DataGrid");
            }
            //获取目标DataGrid，为空则抛出异常
            System.Windows.Controls.DataGrid dg = dataGrid as System.Windows.Controls.DataGrid;
            if (dg == null)
            {
                throw new ArgumentNullException("目标无" + dataGrid + "无法转换为DataGrid");
            }
            //数据源为空则返回
            if (dg.Items == null || dg.Items.Count < 1)
            {
                return;
            }

            //获取焦点，滚动为目标行
            dg.Focus();
            dg.SelectedItem = selectedItem;
            dg.CurrentColumn = dg.Columns[0];
            dg.ScrollIntoView(dg.SelectedItem, dg.CurrentColumn);
        }


        /// <summary>
        /// 获取选中的行
        /// </summary>
        /// <param name="datagrid"></param>
        /// <param name="rowIndex"></param>
        /// <returns></returns>
        public static DataGridRow GetDataGridRow(DataGrid datagrid, int rowIndex)
        {
            DataGridRow row = (DataGridRow)datagrid.ItemContainerGenerator.ContainerFromIndex(rowIndex);
            if (row == null)
            {
                datagrid.UpdateLayout();

                row = (DataGridRow)datagrid.ItemContainerGenerator.ContainerFromIndex(rowIndex);
                row.IsSelected = true;
            }
            return row;
        }

在代码中使用这两个函数

resultDataGrid.SelectedItem = item;
                    DataGridRow resRow = GetDataGridRow(resultDataGrid, (int)item.ID);
                    resRow.IsSelected = true;
                    SetSelectedItemFirstRow(resultDataGrid,resultDataGrid.SelectedItem);
                    resultDataGrid.UpdateLayout();

参考：

https://bbs.csdn.net/topics/392174816?page=1

https://blog.csdn.net/u012559285/article/details/51508742

https://blog.csdn.net/jslink_l/article/details/75308349

https://blog.csdn.net/jiuzaizuotian2014/article/details/81661809?depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromBaidu-2&utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromBaidu-2