A DataGridView, DataGridViewCheckBoxColumn, DataGridViewButtonColumn and DataColumn.
As I continue to work on moving (upgrading?) applications and code to
dotNET 2.0 I continue to find that in some cases certain implemenations have made changes that simplify things. One case in particular, is the displaying of
CheckBoxes and
Buttons in a
DataGrid. One old way was to override the painting of a cell. Another might have been to overaly a control in the clipped rectangle of the
DataGrid.
As with any
“upgrade” new
“things” are introduced. In this case I will refer to the
DataGridView,
DataGridViewCheckBoxColumn and the
DataGridViewButtonColumn classes. The allows for the displaying of
“data” in a grid (
Note: when working with large amounts of data don’t forget to set the VirtualMode property). This source of the data can be anything that implements a
IList,
IListSource,
IBindingList or I
BindingListView interface. The data displayed doesn’t always have to be from a database, a one dimmensional array alos works well with a datagrid (take a look at the sample method
PopulateDataGridView). It may sound intimidating, but this is all fairly straght forward.
1
namespace DrawInDataGrid1
2
...{
3
public partial class Form1 : Form
4
...{
5 private DataTable myTable;
6 private DataGridViewCheckBoxColumn checkcolumn;
7 private DataGridViewButtonColumn buttoncolumn;
8 private DataColumn colItem1, colItem2, colItem3;
9 private DataRow NewRow;
10 private DataView myView;
11
12 public Form1()
13 ...{
14 InitializeComponent();
15
}
16
17 private void Form1_Load(object sender, EventArgs e)
18 ...{
19 // DataTable to hold data that is displayed in DataGrid
20 myTable = new DataTable("myTable");
21
22 // the three columns in the table
23 colItem1 = new DataColumn("CheckBox", Type.GetType("System.Boolean"));
24 colItem2 = new DataColumn("Button", Type.GetType("System.String"));
25 colItem3 = new DataColumn("String", Type.GetType("System.String"));
26
27 // add the columns to the table
28 myTable.Columns.Add(colItem1);
29 myTable.Columns.Add(colItem2);
30 myTable.Columns.Add(colItem3);
31
32 checkcolumn = new DataGridViewCheckBoxColumn(false);
33 checkcolumn.HeaderText = "CheckBox";
34 checkcolumn.DataPropertyName = "CheckBox";
35
36 buttoncolumn = new DataGridViewButtonColumn();
37 buttoncolumn.HeaderText = "Button";
38 buttoncolumn.DataPropertyName = "Button";
39
40 dataGridView1.Columns.Add(checkcolumn);
41 dataGridView1.Columns.Add(buttoncolumn);
42
43
44 // Fill in some data
45 NewRow = myTable.NewRow();
46 NewRow[0] = true;
47 NewRow[1] = "0";
48 NewRow[2] = "Test";
49 myTable.Rows.Add(NewRow);
50
51 NewRow = myTable.NewRow();
52 NewRow[0] = false;
53 NewRow[1] = "1";
54 NewRow[2] = "Next One";
55 myTable.Rows.Add(NewRow);
56
57 // DataView for the DataGridView
58 myView = new DataView(myTable);
59 myView.AllowDelete = false;
60 myView.AllowEdit = false;
61 myView.AllowNew = false;
62
63 // add an event to check for button click
64 this.dataGridView1.CellContentClick +=
65 new System.Windows.Forms.DataGridViewCellEventHandler(this.dataGridView1_CellContentClick);
66
67 // Assign DataView to DataGrid
68 dataGridView1.DataSource = myView;
69 }
70
71
72 private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
73 ...{
74 if (sender is DataGridView)
75 ...{
76 if ((((DataGridView)sender).Columns[e.ColumnIndex] is DataGridViewButtonColumn) &&
77 (e.RowIndex >= 0))
78 ...{
79 MessageBox.Show(e.RowIndex.ToString());
80 }
81 }
82 }
83 }
84
} Another
“column” I am glad they added is the
DataGridViewImageColumn.
Labels: .NET, C#, Code
AddrMon
October 2005
Anonymous Thursday, April 12, 2007 12:10:00 PM