ASP.NET:在DataGrid中显示下拉列表框

ASP.NET:在DataGrid中显示下拉列表框
脚本：

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<asp:DataGrid id="dgHHRole" runat="server" CssClass="DefaultText" AutoGenerateColumns="False" AllowPaging="True" PageSize="20" AllowSorting="True">
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<FooterStyle Wrap="False" HorizontalAlign="Center" VerticalAlign="Middle"></FooterStyle>
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<SelectedItemStyle HorizontalAlign="Center" ForeColor="Black" CssClass="defaultText" BackColor="#99FFFF"></SelectedItemStyle>
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<AlternatingItemStyle HorizontalAlign="Center" CssClass="GridAlternateRows"></AlternatingItemStyle>
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<ItemStyle HorizontalAlign="Center"></ItemStyle>
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<HeaderStyle HorizontalAlign="Left" CssClass="GridHeaderAbove" VerticalAlign="Middle"></HeaderStyle>
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<Columns>
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<asp:BoundColumn Visible="False" DataField="RoleId" HeaderText="RoleId"></asp:BoundColumn>
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<asp:BoundColumn DataField="FullName" SortExpression="FullName" HeaderText="Full Name"></asp:BoundColumn>
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<asp:BoundColumn DataField="Location" HeaderText="Location"></asp:BoundColumn>
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<asp:BoundColumn DataField="CallType" HeaderText="Call Type"></asp:BoundColumn>
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<asp:BoundColumn DataField="RouteNm" HeaderText="Route Number"></asp:BoundColumn>
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<asp:TemplateColumn HeaderText="Role">
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<ItemTemplate>
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<asp:DropDownList id="ddlHHRole" runat="server"></asp:DropDownList>
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</ItemTemplate>
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</asp:TemplateColumn>
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</Columns>
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<PagerStyle Mode="NumericPages"></PagerStyle>
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</asp:DataGrid>
在ItemCreated事件中绑定数据

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private void dgHHRole_ItemCreated(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
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{
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if(e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
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{
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DropDownList ddl = (DropDownList)e.Item.FindControl("ddlHHRole");
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if(ddl != null)
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{
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ddl.DataSource = HHRoleDt;
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ddl.DataTextField = "RoleNm";
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ddl.DataValueField = "RoleId";
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ddl.DataBind();
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}
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}
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}
在ItemDataBound事件中设置值

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private void dgHHRole_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
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{
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if(e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
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{
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DropDownList ddl = (DropDownList)e.Item.FindControl("ddlHHRole");
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ListItem lst = new ListItem();
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lst.Text = "";
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lst.Value = "";
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ddl.Items.Insert(0,lst);
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SetValue(ddl,e.Item.Cells[0].Text);
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}
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}
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private void SetValue(DropDownList ddl,string strvalue)
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{
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if(strvalue == null || strvalue.Trim().Length ==0)
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{
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return;
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}
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if(ddl != null && ddl.Items.Count >0)
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{
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int iIndex;
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for(iIndex=0;iIndex<ddl.Items.Count;iIndex++)
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{
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if(ddl.Items[iIndex].Value.Trim() == strvalue.Trim())
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{
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ddl.Items[iIndex].Selected =true;
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return;
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}
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else
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{
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ddl.Items[iIndex].Selected =false;
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}
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}
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}
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}