2020-04-27
2020-04-28 更新
GridView1.Columns.Count 是「非自動生成列數」。不管是否為 Visible。
GridView1.HeaderRow.Cells.Count 是「自動生成列數」和「非自動生成列數」的總和。不管是否為 Visible。
GridView1 會先顯示「非自動生成」的欄位，再顯示「自動生成」的欄位。
GridView1.Visible = false; 時，GridView1.HeaderRow.Cells[i].Visible 總是會 false。
GridView1.Visible = true; 時，GridView1.HeaderRow.Cells[i].Visible 總是會 true。
GridView1.Columns[i].Visible 才能判斷該欄位是否為 true 或 false。
Default.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication3.Default" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:TestDBConnectionString %>"
SelectCommand="SELECT * FROM [MyTable]"></asp:SqlDataSource>
<br />
<asp:GridView ID="GridView1" runat="server" AllowPaging="True" AllowSorting="True"
Caption="GridView1：非自動生成列"
AutoGenerateColumns="False" DataKeyNames="SN" DataSourceID="SqlDataSource1">
<Columns>
<asp:BoundField DataField="SN" HeaderText="SN" InsertVisible="False" ReadOnly="True" SortExpression="SN" />
<asp:BoundField DataField="myID" HeaderText="myID" SortExpression="myID" />
<asp:BoundField DataField="myName" HeaderText="myName" SortExpression="myName" />
<asp:BoundField DataField="purchaseDate" HeaderText="purchaseDate" SortExpression="purchaseDate" />
</Columns>
</asp:GridView>
<br />
<asp:GridView ID="GridView2" runat="server" AllowPaging="True" AllowSorting="True"
Caption="GridView2：自動生成列"
AutoGenerateColumns="true" DataKeyNames="SN" DataSourceID="SqlDataSource1">
</asp:GridView>
<br />
<asp:GridView ID="GridView3" runat="server" AllowPaging="True" AllowSorting="True" AutoGenerateColumns="False"
Caption="GridView3：非自動生成列"
DataKeyNames="SN" DataSourceID="SqlDataSource1" Visible="false">
<Columns>
<asp:BoundField DataField="SN" HeaderText="SN" InsertVisible="False" ReadOnly="True" SortExpression="SN" />
<asp:BoundField DataField="myID" HeaderText="myID" SortExpression="myID" />
<asp:BoundField DataField="myName" HeaderText="myName" SortExpression="myName" />
<asp:BoundField DataField="purchaseDate" HeaderText="purchaseDate" SortExpression="purchaseDate" />
</Columns>
</asp:GridView>
<br />
<asp:GridView ID="GridView4" runat="server" AllowPaging="True" AllowSorting="True"
Caption="GridView4：非自動生成列"
AutoGenerateColumns="true" DataKeyNames="SN" DataSourceID="SqlDataSource1" Visible="false">
</asp:GridView>
<br />
<asp:GridView ID="GridView5" runat="server" AllowPaging="True" AllowSorting="True"
Caption="GridView5：混合自動生成列"
AutoGenerateColumns="true" DataKeyNames="SN" DataSourceID="SqlDataSource1" Visible="false">
<Columns>
<asp:BoundField DataField="SN" HeaderText="SN" InsertVisible="False" ReadOnly="True" SortExpression="SN" />
<asp:BoundField DataField="SN" HeaderText="SN" InsertVisible="False" ReadOnly="True" SortExpression="SN" Visible="false" />
<%--<asp:BoundField DataField="SN" HeaderText="SN" InsertVisible="False" ReadOnly="True" SortExpression="SN" />--%>
</Columns>
</asp:GridView>
<br />
<asp:GridView ID="GridView6" runat="server" AllowPaging="True" AllowSorting="True" AutoGenerateColumns="False"
Caption="GridView6：非自動生成列"
DataKeyNames="SN" DataSourceID="SqlDataSource1" Visible="false">
<Columns>
<asp:BoundField DataField="SN" HeaderText="SN" InsertVisible="False" ReadOnly="True" SortExpression="SN" />
<asp:BoundField DataField="myID" HeaderText="myID" SortExpression="myID" Visible="false" />
<asp:BoundField DataField="myName" HeaderText="myName" SortExpression="myName" />
<asp:BoundField DataField="purchaseDate" HeaderText="purchaseDate" SortExpression="purchaseDate" />
</Columns>
</asp:GridView>
<br />
<asp:GridView ID="GridView7" runat="server" AllowPaging="True" AllowSorting="True" AutoGenerateColumns="False"
Caption="GridView7：非自動生成列"
DataKeyNames="SN" DataSourceID="SqlDataSource1" Visible="true">
<Columns>
<asp:BoundField DataField="SN" HeaderText="SN" InsertVisible="False" ReadOnly="True" SortExpression="SN" />
<asp:BoundField DataField="myID" HeaderText="myID" SortExpression="myID" Visible="false" />
<%--<asp:BoundField DataField="myName" HeaderText="myName" SortExpression="myName" />--%>
<asp:BoundField DataField="purchaseDate" HeaderText="purchaseDate" SortExpression="purchaseDate" />
</Columns>
</asp:GridView>
<br />
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
<br />
<br />
GridView1.Columns.Count 是「非自動生成列數」。不管是否為 Visible。<br />
GridView1.HeaderRow.Cells.Count 是「自動生成列數」和「非自動生成列數」的總和。不管是否為 Visible。<br />
<br />
GridView1.Visible = false; 時，GridView1.HeaderRow.Cells[i].Visible 總是會 false。<br />
<br />
<asp:Label ID="Label1" runat="server" ></asp:Label><br />
<br />
</div>
</form>
</body>
</html>
|
Default.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebApplication3
{
public partial class Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = "";
Label1.Text = Label1.Text + "GridView1.HeaderRow.Cells.Count : " + GridView1.HeaderRow.Cells.Count + "<br />";
Label1.Text = Label1.Text + "GridView2.HeaderRow.Cells.Count : " + GridView2.HeaderRow.Cells.Count + "<br />";
Label1.Text = Label1.Text + "GridView3.HeaderRow.Cells.Count : " + GridView3.HeaderRow.Cells.Count + "<br />";
Label1.Text = Label1.Text + "GridView4.HeaderRow.Cells.Count : " + GridView4.HeaderRow.Cells.Count + "<br />";
Label1.Text = Label1.Text + "GridView5.HeaderRow.Cells.Count : " + GridView5.HeaderRow.Cells.Count + "<br />";
Label1.Text = Label1.Text + "GridView6.HeaderRow.Cells.Count : " + GridView6.HeaderRow.Cells.Count + "<br />";
Label1.Text = Label1.Text + "GridView7.HeaderRow.Cells.Count : " + GridView7.HeaderRow.Cells.Count + "<br />";
Label1.Text = Label1.Text + "GridView1.Columns.Count : " + GridView1.Columns.Count + "<br />";
Label1.Text = Label1.Text + "GridView2.Columns.Count : " + GridView2.Columns.Count + "<br />";
Label1.Text = Label1.Text + "GridView3.Columns.Count : " + GridView3.Columns.Count + "<br />";
Label1.Text = Label1.Text + "GridView4.Columns.Count : " + GridView4.Columns.Count + "<br />";
Label1.Text = Label1.Text + "GridView5.Columns.Count : " + GridView5.Columns.Count + "<br />";
Label1.Text = Label1.Text + "GridView6.Columns.Count : " + GridView6.Columns.Count + "<br />";
Label1.Text = Label1.Text + "GridView7.Columns.Count : " + GridView7.Columns.Count + "<br />";
}
}
}
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