自行加入自定義的GridView的表頭後，原來GridView裡定義的AllowSorting="True"及SortExpression功能便消失，CustomerID、CompanyName、Address、City欄位標題變為純文字而無法切換正反向排序。
在網路找了許久，有的加入HyperLink帶sort變數或加入session控制排序方向，或有的加寫GridView1_Sorting。終於找到某連結網址，網址已不可考了，我連結NorthWind資料表Customers當測試，試到目前，以下我的Sample方式，我覺得最符合我的需求，只需控制到GridView1_RowCreated即可，原來定義的AllowSorting="True"及SortExpression依舊有效。
VB
<%@ Page Language="VB" Debug="true" %>
<%@ Import Namespace="system.web.httputility" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<script runat="server">
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
End Sub
Protected Sub GridView1_RowCreated(sender As Object, e As GridViewRowEventArgs)
If e.Row.RowType = DataControlRowType.Header Then
Dim tcc As TableCellCollection = e.Row.Cells
Dim intcount As Integer = tcc.Count '前端網頁碼定義Columns裡的欄位數量,此例為4 = CustomerID、CompanyName、Address、City
tcc.Add(New TableHeaderCell())
tcc(4).Attributes.Add("colspan", "4") '由前端網頁碼定義Columns裡的欄位數量後開始編號，此例為0,1,2,3後，使用tcc(4)
tcc(4).Attributes.Add("bgcolor", "#00ff00")
tcc(4).Text = "第一列跨行測試</th></tr><tr>" '換列要加</tr><tr>
tcc.Add(New TableHeaderCell())
tcc(5).Attributes.Add("colspan", "2")
tcc(5).Attributes.Add("rowspan", "2")
tcc(5).Attributes.Add("bgcolor", "#ff00ff")
tcc(5).Text = "第二列跨行跨列測試一</th>"
tcc.Add(New TableHeaderCell())
tcc(6).Attributes.Add("colspan", "2")
tcc(6).Attributes.Add("bgcolor", "#00ffff")
tcc(6).Text = "第二列跨行測試二</th></tr><tr>" '換列要加</tr><tr>
tcc.Add(New TableHeaderCell())
tcc(7).Attributes.Add("bgcolor", "#444444")
tcc(7).Text = "第三列跨行測試一</th>"
tcc.Add(New TableHeaderCell())
tcc(8).Attributes.Add("bgcolor", "#777777")
tcc(8).Text = "第三列跨行測試二</th></tr><tr>" '換列要加</tr><tr>
For i As Integer = 0 To intcount -1
tcc.Add(tcc(0)) '開始加入CustomerID、CompanyName、Address、City
Next
'以上layout完成後，tcc(編號)為由左至右由上至下開始重新排列；tcc(0)為第一列跨行測試、tcc(1)為第二列跨行跨列測試一、tcc(2)為第二列跨行測試二、tcc(3)為第三列跨行測試一、tcc(4)為第三列跨行測試二、tcc(5)為CustomerID、tcc(6)為CompanyName、tcc(7)為Address、tcc(8)為City
tcc(5).Attributes.Add("bgcolor", "#0000ff")
tcc(6).Attributes.Add("bgcolor", "#0000bb")
tcc(7).Attributes.Add("bgcolor", "#000077")
tcc(8).Attributes.Add("bgcolor", "#000033")
End If
End Sub
</script>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=big5">
</head>
<body style="FONT: 10pt 細明體">
<form runat="server">
<center>
<asp:Label id="message" runat="server" font-bold="True" font-size="18"/>
</center>
<asp:GridView ID="GridView1" runat="server" DataKeyNames="CustomerID" AutoGenerateColumns="False" CellPadding="4" ForeColor="#333333" GridLines="None" DataSourceID="SqlDataSource1" Font-Size="10pt" BorderColor="#999999" BorderStyle="Solid" AllowSorting="True" AllowPaging="True" PageSize="10" OnRowCreated="GridView1_RowCreated" >
<FooterStyle BackColor="#990000" Font-Bold="False" ForeColor="White" />
<Columns>
<asp:BoundField DataField="CustomerID" HeaderText="CustomerID" readonly="true" SortExpression="CustomerID" ItemStyle-HorizontalAlign="Right" />
<asp:BoundField DataField="CompanyName" HeaderText="CompanyName" readonly="true" SortExpression="CompanyName" ItemStyle-HorizontalAlign="Right" ItemStyle-Width="200px" />
<asp:BoundField DataField="Address" HeaderText="Address" readonly="true" SortExpression="Address" ItemStyle-HorizontalAlign="Right" ItemStyle-Width="200px" />
<asp:BoundField DataField="City" HeaderText="City" readonly="true" SortExpression="City" ItemStyle-HorizontalAlign="Right" />
</Columns>
<RowStyle BackColor="#FFFBD6" ForeColor="#333333" />
<SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" />
<PagerStyle BackColor="#FFCC66" ForeColor="#333333" HorizontalAlign="Center" />
<HeaderStyle BackColor="#999999" Font-Bold="False" ForeColor="White" />
<AlternatingRowStyle BackColor="White" />
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ connectionStrings:NorthwindConnectionString %>" SelectCommand="SELECT Customerid, CompanyName, Address, City from Customers" >
</asp:SqlDataSource>
</form>
</body>
</html>
C#
<%@ Page Language="C#" Debug="true" %>
<%@ Import Namespace="System" %>
<%@ Import Namespace="System.Web" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.Sql" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
}
}
protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.Header) {
TableCellCollection tcc = e.Row.Cells;
int intcount = tcc.Count; //前端網頁碼定義Columns裡的欄位數量,此例為4 = CustomerID、CompanyName、Address、City
tcc.Add(new TableHeaderCell());
tcc[4].Attributes.Add("colspan", "4"); //由前端網頁碼定義Columns裡的欄位數量後開始編號，此例為0,1,2,3後，使用tcc(4]
tcc[4].Attributes.Add("bgcolor", "#00ff00");
tcc[4].Text = "第一列跨行測試</th></tr><tr>"; //換列要加</tr><tr>
tcc.Add(new TableHeaderCell());
tcc[5].Attributes.Add("colspan", "2");
tcc[5].Attributes.Add("rowspan", "2");
tcc[5].Attributes.Add("bgcolor", "#ff00ff");
tcc[5].Text = "第二列跨行跨列測試一</th>";
tcc.Add(new TableHeaderCell());
tcc[6].Attributes.Add("colspan", "2");
tcc[6].Attributes.Add("bgcolor", "#00ffff");
tcc[6].Text = "第二列跨行測試二</th></tr><tr>"; //換列要加</tr><tr>
tcc.Add(new TableHeaderCell());
tcc[7].Attributes.Add("bgcolor", "#444444");
tcc[7].Text = "第三列跨行測試一</th>";
tcc.Add(new TableHeaderCell());
tcc[8].Attributes.Add("bgcolor", "#777777");
tcc[8].Text = "第三列跨行測試二</th></tr><tr>"; //換列要加</tr><tr>
for (int i = 0; i <= intcount - 1; i++) {
tcc.Add(tcc[0]); //開始加入CustomerID、CompanyName、Address、City
}
//以上layout完成後，tcc[編號]為由左至右由上至下開始重新排列；tcc[0]為第一列跨行測試、tcc[1]為第二列跨行跨列測試一、tcc[2]為第二列跨行測試二、tcc[3]為第三列跨行測試一、tcc[4]為第三列跨行測試二、tcc[5]為CustomerID、tcc[6]為CompanyName、tcc[7]為Address、tcc[8]為City
tcc[5].Attributes.Add("bgcolor", "#0000ff");
tcc[6].Attributes.Add("bgcolor", "#0000bb");
tcc[7].Attributes.Add("bgcolor", "#000077");
tcc[8].Attributes.Add("bgcolor", "#000033");
}
}
</script>
<html>
<head id="Head1" runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<center>
<asp:Label id="message" runat="server" font-bold="True" font-size="18"/>
</center>
<asp:GridView ID="GridView1" runat="server" DataKeyNames="CustomerID" AutoGenerateColumns="False" CellPadding="4" ForeColor="#333333" GridLines="None" DataSourceID="SqlDataSource1" Font-Size="10pt" BorderColor="#999999" BorderStyle="Solid" AllowSorting="True" AllowPaging="True" PageSize="10" OnRowCreated="GridView1_RowCreated" >
<FooterStyle BackColor="#990000" Font-Bold="False" ForeColor="White" />
<Columns>
<asp:BoundField DataField="CustomerID" HeaderText="CustomerID" readonly="true" SortExpression="CustomerID" ItemStyle-HorizontalAlign="Right" />
<asp:BoundField DataField="CompanyName" HeaderText="CompanyName" readonly="true" SortExpression="CompanyName" ItemStyle-HorizontalAlign="Right" ItemStyle-Width="200px" />
<asp:BoundField DataField="Address" HeaderText="Address" readonly="true" SortExpression="Address" ItemStyle-HorizontalAlign="Right" ItemStyle-Width="200px" />
<asp:BoundField DataField="City" HeaderText="City" readonly="true" SortExpression="City" ItemStyle-HorizontalAlign="Right" />
</Columns>
<RowStyle BackColor="#FFFBD6" ForeColor="#333333" />
<SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" />
<PagerStyle BackColor="#FFCC66" ForeColor="#333333" HorizontalAlign="Center" />
<HeaderStyle BackColor="#999999" Font-Bold="False" ForeColor="White" />
<AlternatingRowStyle BackColor="White" />
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ connectionStrings:NorthwindConnectionString %>" SelectCommand="SELECT Customerid, CompanyName, Address, City from Customers" >
</asp:SqlDataSource>
</form>
</body>
</html>
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