ASP.NET:在DataGrid中显示下拉列表框

脚本：

 1<asp:DataGrid id="dgHHRole" runat="server" CssClass="DefaultText" AutoGenerateColumns="False" AllowPaging="True" PageSize="20" AllowSorting="True">
 2<FooterStyle Wrap="False" HorizontalAlign="Center" VerticalAlign="Middle"></FooterStyle>
 3<SelectedItemStyle HorizontalAlign="Center" ForeColor="Black" CssClass="defaultText" BackColor="#99FFFF"></SelectedItemStyle>
 4<AlternatingItemStyle HorizontalAlign="Center" CssClass="GridAlternateRows"></AlternatingItemStyle>
 5<ItemStyle HorizontalAlign="Center"></ItemStyle>
 6<HeaderStyle HorizontalAlign="Left" CssClass="GridHeaderAbove" VerticalAlign="Middle"></HeaderStyle>
 7<Columns>
 8    <asp:BoundColumn Visible="False" DataField="RoleId" HeaderText="RoleId"></asp:BoundColumn>
 9    <asp:BoundColumn DataField="FullName" SortExpression="FullName" HeaderText="Full Name"></asp:BoundColumn>
10    <asp:BoundColumn DataField="Location" HeaderText="Location"></asp:BoundColumn>
11    <asp:BoundColumn DataField="CallType" HeaderText="Call Type"></asp:BoundColumn>
12    <asp:BoundColumn DataField="RouteNm" HeaderText="Route Number"></asp:BoundColumn>
13    <asp:TemplateColumn HeaderText="Role">
14        <ItemTemplate>
15            <asp:DropDownList id="ddlHHRole" runat="server"></asp:DropDownList>
16        </ItemTemplate>
17    </asp:TemplateColumn>
18</Columns>
19<PagerStyle Mode="NumericPages"></PagerStyle>
20</asp:DataGrid>

在ItemCreated事件中绑定数据

 1        private void dgHHRole_ItemCreated(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
 2        {
 3            if(e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
 4            {
 5                DropDownList ddl = (DropDownList)e.Item.FindControl("ddlHHRole");
 6                if(ddl != null)
 7                {
 8                    ddl.DataSource = HHRoleDt;
 9                    ddl.DataTextField = "RoleNm";
10                    ddl.DataValueField = "RoleId";
11                    ddl.DataBind();
12                }
13            }
14        }

在ItemDataBound事件中设置值

 1        private void dgHHRole_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
 2        {
 3            if(e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
 4            {
 5                DropDownList ddl = (DropDownList)e.Item.FindControl("ddlHHRole");
 6                ListItem lst = new ListItem();
 7                lst.Text = "";
 8                lst.Value = "";
 9
10                ddl.Items.Insert(0,lst);
11                SetValue(ddl,e.Item.Cells[0].Text);
12            }
13        }
14
15        private void SetValue(DropDownList ddl,string strvalue)
16        {
17            if(strvalue == null || strvalue.Trim().Length ==0)
18            {
19                return;
20            }
21            if(ddl != null && ddl.Items.Count >0)
22            {
23                int iIndex;
24                for(iIndex=0;iIndex<ddl.Items.Count;iIndex++)
25                {
26                    if(ddl.Items[iIndex].Value.Trim() ==  strvalue.Trim())
27                    {
28                        ddl.Items[iIndex].Selected =true;
29                        return;
30                    }
31                    else
32                    {
33                        ddl.Items[iIndex].Selected =false;
34                    }
35                }
36            }
37        }