<cc1:MenuTemplate ID="mtCategory" runat="server">
    <cc1:MenuItemTemplate ID="mitFilter" runat="server" Text="View Products" />
</cc1:MenuTemplate>

protected override void OnInit(EventArgs e)
{
    base.OnInit(e);
    this.SPGridView1.GroupMenu = new SPMenuField();
    this.SPGridView1.GroupMenu.MenuTemplateId = this.mtCategory.ID;
    this.SPGridView1.GroupMenu.HeaderText = "Category";
    this.SPGridView1.GroupMenu.TextFields = "CategoryName";
}

完整代码:

<%@ Page Language="C#" MasterPageFile="~masterurl/Default.Master" %>

<%@ Register Assembly="Microsoft.SharePoint, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" Namespace="Microsoft.SharePoint.WebControls" TagPrefix="cc1" %>

<script runat="server">
   1:  
   2:     protected override void OnInit(EventArgs e)
   3:     {
   4:         base.OnInit(e);
   5:         this.SPGridView1.GroupMenu = new SPMenuField();
   6:         this.SPGridView1.GroupMenu.MenuTemplateId = this.mtCategory.ID;
   7:         this.SPGridView1.GroupMenu.HeaderText = "Category";
   8:         this.SPGridView1.GroupMenu.TextFields = "CategoryName";
   9:     }
</script>

<asp:Content ID="Content3" ContentPlaceHolderID="PlaceHolderAdditionalPageHead" runat="server">
</asp:Content>
<asp:Content ID="Content1" ContentPlaceHolderID="PlaceHolderPageTitleInTitleArea" runat="server">
    SPGridView Demo: Part 3 - Grouping
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="PlaceHolderMain" runat="server">
    <!--SPGridView-->
    <cc1:SPGridView ID="SPGridView1" runat="server" EnableViewState="false" AutoGenerateColumns="False" DataSourceID="ObjectDataSource1" AllowSorting="true" AllowGrouping="true" GroupField="CategoryName" AllowGroupCollapse="true">
        <Columns>
            <cc1:SPBoundField DataField="ProductId" HeaderText="Product ID" SortExpression="ProductId">
            </cc1:SPBoundField>
            <cc1:SPBoundField DataField="ProductName" HeaderText="Product Name" SortExpression="ProductName" />
            <asp:BoundField DataField="UnitPrice" DataFormatString="${0:F2}" HeaderText="Unit Price" SortExpression="UnitPrice" />
            <asp:TemplateField HeaderText="Orderable" SortExpression="Discontinued">
                <itemtemplate>
                <asp:Label id="lblDiscontinued" runat="server" text='<%# Convert.ToBoolean(Eval("Discontinued")) ? "Yes" : "No" %>'></asp:Label>
</itemtemplate>
            </asp:TemplateField>
        </Columns>
    </cc1:SPGridView>
    <!--SPGridView-->
    <!--MenuTemplate-->
    <cc1:MenuTemplate ID="mtCategory" runat="server">
        <cc1:MenuItemTemplate ID="mitFilter" runat="server" Text="View Products" />
    </cc1:MenuTemplate>
    <!--MenuTemplate-->
    <!--ObjectDataSource-->
    <asp:ObjectDataSource ID="ObjectDataSource1" runat="server" SelectMethod="GetProductList" TypeName="SPGridView_Demo.NorthwindData" SortParameterName="sortExpression"></asp:ObjectDataSource>
    <!--ObjectDataSource-->
</asp:Content>