WPF DataGrid控件扩展

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;
        }
    }
}