WPF DataGrid控件扩展

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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows.Controls; using System.Windows.Controls.Primitives; using System.Windows.Media;   namespace Controls.Helper {     public static class DataGridExtensions     {         /// <summary>         /// 返回给定行和列的DataGridCell         /// </summary>         /// <param name="grid">The DataGrid</param>         /// <param name="row">The zero-based row index</param>         /// <param name="column">The zero-based column index</param>         /// <returns>The requested DataGridCell, or null if the indices are out of range</returns>         public static DataGridCell GetCell(this DataGrid grid, Int32 row, Int32 column)         {             DataGridRow gridrow = grid.GetRow(row);             if (gridrow != null)             {                 DataGridCellsPresenter presenter = GetVisualChild<DataGridCellsPresenter>(gridrow);                 // try to get the cell but it may possibly be virtualized                 DataGridCell cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(column);                 if (cell == null)                 {                     // now try to bring into view and retreive the cell                     grid.ScrollIntoView(gridrow, grid.Columns[column]);                       cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(column);                 }                   return (cell);             }               return (null);         }           /// <summary>         /// 基于给定索引获取DataGridRow         /// </summary>         /// <param name="idx">The zero-based index of the container to get</param>         public static DataGridRow GetRow(this DataGrid dataGrid, Int32 idx)         {             DataGridRow row = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromIndex(idx);             if (row == null)             {                 // may be virtualized, bring into view and try again                 dataGrid.ScrollIntoView(dataGrid.Items[idx]);                 dataGrid.UpdateLayout();                   row = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromIndex(idx);             }               return (row);         }           private static T GetVisualChild<T>(Visual parent) where T : Visual         {             T child = default(T);               Int32 numvisuals = VisualTreeHelper.GetChildrenCount(parent);             for (Int32 i = 0; i < numvisuals; ++i)             {                 Visual v = (Visual)VisualTreeHelper.GetChild(parent, i);                 child = v as T;                 if (child == null)                     child = GetVisualChild<T>(v);                 else                     break;             }               return child;         }     } }