1 private void button1_Click(object sender, EventArgs e)
2 {
3 DataTable dt = new DataTable();
4 dt.Columns.Add("Group");
5 dt.Columns.Add("idex");
6 dt.Columns.Add("name");
7 for (int i = 0; i < 5; i++)
8 {
9 DataRow dr = dt.NewRow();
10 dr["Group"] = "<5";
11 dr["idex"] = i.ToString();
12 dr["name"] = "姓名" + i.ToString();
13 dt.Rows.Add(dr);
14 }
15 for (int i = 5; i <= 10; i++)
16 {
17 DataRow dr = dt.NewRow();
18 dr["Group"] = "(5,10]";
19 dr["idex"] = i.ToString();
20 dr["name"] = "姓名" + i.ToString();
21 dt.Rows.Add(dr);
22 }
23 for (int i = 10; i <= 15; i++)
24 {
25 DataRow dr = dt.NewRow();
26 dr["Group"] = "(10,15]";
27 dr["idex"] = i.ToString();
28 dr["name"] = "姓名" + i.ToString();
29 dt.Rows.Add(dr);
30 }
31
32 gridColumnNumber.FieldName = "idex";
33 gridColumnName.FieldName = "name";
34 gridColumnGroup.FieldName = "Group";
35 gridColumnGroup.GroupIndex = 0;
36 gdc.DataSource = dt;
37 gdv.ExpandAllGroups();
38
39 for (int i = -1; gdv.IsGroupRow(i); i--)
40 {
41 DataRow dr = gdv.GetDataRow(gdv.GetDataRowHandleByGroupRowHandle(i));
42 if (dr == null) return;
43 if (dr["Group"].ToString() == "(5,10]")
44 {
45 gdv.CollapseAllGroups();
46 gdv.FocusedRowHandle = i;
47 gdv.SetRowExpanded(i, true);
48 return;
49 }
50 }
51 }
