DataGrid 得到DataGridRow 和DataGridColumn

 1 /* ----------------------------------------------------------
 2 文件名称：DataGridPlus.cs
 3 
 4 作者：秦建辉
 5 
 6 MSN：splashcn@msn.com
 7 QQ：36748897
 8 
 9 博客：http://blog.csdn.net/jhqin
10 
11 开发环境：
12     Visual Studio V2010
13     .NET Framework 4 Client Profile
14 
15 版本历史：
16     V1.0    2012年06月07日
17             WPF DataGrid控件扩展方法
18 
19 参考资料：
20     http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/b7299e55-92e2-4a6b-8987-869fef8f22eb/
21 ------------------------------------------------------------ */
22 using System.Windows.Controls;
23 using System.Windows.Controls.Primitives;
24 using System.Windows.Media;
25 
26 namespace Splash.WPF
27 {
28     public static class DataGridPlus
29     {
30         /// <summary>
31         /// 获取DataGrid控件单元格
32         /// </summary>
33         /// <param name="dataGrid">DataGrid控件</param>
34         /// <param name="rowIndex">单元格所在的行号</param>
35         /// <param name="columnIndex">单元格所在的列号</param>
36         /// <returns>指定的单元格</returns>
37         public static DataGridCell GetCell(this DataGrid dataGrid, int rowIndex, int columnIndex)        
38         {
39             DataGridRow rowContainer = dataGrid.GetRow(rowIndex);
40             if (rowContainer != null)
41             {
42                 DataGridCellsPresenter presenter = GetVisualChild<DataGridCellsPresenter>(rowContainer);
43                 DataGridCell cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(columnIndex);
44                 if (cell == null)
45                 {
46                     dataGrid.ScrollIntoView(rowContainer, dataGrid.Columns[columnIndex]);
47                     cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(columnIndex);
48                 }
49                 return cell;
50             }
51             return null;
52         }
53 
54         /// <summary>
55         /// 获取DataGrid的行
56         /// </summary>
57         /// <param name="dataGrid">DataGrid控件</param>
58         /// <param name="rowIndex">DataGrid行号</param>
59         /// <returns>指定的行号</returns>
60         public static DataGridRow GetRow(this DataGrid dataGrid, int rowIndex)        
61         {
62             DataGridRow rowContainer = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromIndex(rowIndex);
63             if (rowContainer == null)
64             {
65                 dataGrid.UpdateLayout();
66                 dataGrid.ScrollIntoView(dataGrid.Items[rowIndex]);
67                 rowContainer = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromIndex(rowIndex);
68             }
69             return rowContainer;
70         }
71 
72         /// <summary>
73         /// 获取父可视对象中第一个指定类型的子可视对象
74         /// </summary>
75         /// <typeparam name="T">可视对象类型</typeparam>
76         /// <param name="parent">父可视对象</param>
77         /// <returns>第一个指定类型的子可视对象</returns>
78         public static T GetVisualChild<T>(Visual parent) where T : Visual
79         {
80             T child = default(T);
81             int numVisuals = VisualTreeHelper.GetChildrenCount(parent);
82             for (int i = 0; i < numVisuals; i++)
83             {
84                 Visual v = (Visual)VisualTreeHelper.GetChild(parent, i);
85                 child = v as T;
86                 if (child == null)
87                 {
88                     child = GetVisualChild<T>(v);
89                 }
90                 if (child != null)
91                 {
92                     break;
93                 }
94             }
95             return child;
96         }
97     }
98 }