asp.net – 为什么GridView在回发后不会将标题行呈现为标题行？

在Grid绑定之后,将TableSection = TableRowSection.TableHeader设置为最初,将标题行放在thead中.在回发(网格不重新绑定)之后,标题行还原到表格体.我期望标题行留在thead中;有人可以解释为什么不是这样或者我做错了什么？

样品：

点击按钮进行回发.在回发后,标题不是橙色,因为它不再是inad了.

ASPX

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="gridtest.aspx.cs" Inherits="ffff.gridtest" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <style type="text/css">
    thead th { background-color:Orange;}
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div><asp:Button ID="Button1" runat="server" Text="Button" />
    &nbsp;this button is here just to trigger a postback</div>
    <asp:GridView ID="gv1" runat="server"></asp:GridView>
    </form>
</body>
</html>

码

using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace ffff
{
    public partial class gridtest : System.Web.UI.Page
    {
        protected void Page_Load(object sender,EventArgs e)
        {
            gv1.DataBound += new EventHandler(gv1_DataBound);
            if (!IsPostBack) { BindGrid(); }
        }
        void Page_PreRender(object sender,EventArgs e)
        {
            if (gv1.HeaderRow != null)
                System.Diagnostics.Debug.WriteLine(gv1.HeaderRow.TableSection); // still TableHeader after postback
        }
        void gv1_DataBound(object sender,EventArgs e)
        {
            if (gv1.HeaderRow != null)
            {
                gv1.HeaderRow.TableSection = TableRowSection.TableHeader;
            }
        }
        private void BindGrid()
        {
            gv1.DataSource = this.Page.Controls;
            gv1.DataBind();
        }
    }
}

解决方法

请使用Pre_Render_Complete事件添加表部分.这将确保始终添加该部分.正如您目前在DataBound上所做的那样,只有当数据被绑定时才会添加该部分.

protected override void OnPreRenderComplete(EventArgs e)
    {
        if (gv1.Rows.Count > 0)
        {
            gv1.HeaderRow.TableSection = TableRowSection.TableHeader;                
        }
    }

随意更改我用来检查标题行的行检查.

asp.net – 为什么GridView在回发后不会将标题行呈现为标题行？

解决方法

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