1 using System;
 2 using System.Drawing;
 3 using System.Windows.Forms;
 4 using System.ComponentModel;
 5 
 6 namespace SmartDeviceProject1
 7 {
 8     public class datagridEx :DataGrid,ISupportInitialize
 9     {
10         DataGridCell editcell = new DataGridCell();
11         Rectangle cellpos = new Rectangle();
12         TextBox txtedit = new TextBox();
13         bool isUpdateMode = false;
14         bool isEditMode = false;
15 
16         public datagridEx()
17         {
18             this.Controls.Add(txtedit);
19             txtedit.Visible = false;
20             txtedit.BringToFront();
21             txtedit.Text = "grn";
22         }
23         protected override void OnCurrentCellChanged(EventArgs e)
24         {
25             if (isUpdateMode)
26             {
27                 base.OnCurrentCellChanged(e);
28                 return;
29             }
30             DataGridCell currentcell = this.CurrentCell;
31             if (isEditMode && !this.CurrentCell.Equals(editcell))
32             {
33                 isUpdateMode = true;
34                 this[editcell.RowNumber, editcell.ColumnNumber] = txtedit.Text;
35                 this.CurrentCell = currentcell;
36                 this.Visible = true;
37                 txtedit.Visible = false;
38                 isUpdateMode = false;
39                 isEditMode = false;
40             }
41             editcell = this.CurrentCell;
42             cellpos = this.GetCellBounds(editcell.RowNumber, editcell.ColumnNumber);
43             txtedit.Left = cellpos.Left  - 1;
44             txtedit.Top = cellpos.Top  - 1;
45             txtedit.Width = cellpos.Width + 2;
46             txtedit.Height = cellpos.Height + 2;
47 
48             txtedit.Visible = true;            
49             txtedit.Text = this[editcell.RowNumber, editcell.ColumnNumber].ToString();
50 
51             txtedit.BringToFront();
52             txtedit.Focus();
53             txtedit.SelectAll();
54             isEditMode = true;
55 
56             base.OnCurrentCellChanged(e);
57         }
58 
59         #region ISupportInitialize接口实现
60         public void BeginInit()
61         {            
62         }
63         public void EndInit()
64         {
65         }
66         #endregion
67 
68     }   
69 }