[研究][ASP.NET]DetailsView 如何動態隱藏 BoundField 或 TemplateField 欄位不顯示？
2025-02-12
環境：Visual Studio 2022 + ASP.NET + WebForm + Web Application + C#
(舊文翻出，不太記得是否測過)
********************************************************************************
(下圖)沒做任何隱藏前
Default.aspx：
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication1.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">
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
<asp:Button ID="Button2" runat="server" Text="Button" OnClick="Button2_Click" style="height: 21px" />
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:TestDBConnectionString %>"
DeleteCommand="DELETE FROM [Table4] WHERE [SN] = @SN"
InsertCommand="INSERT INTO [Table4] ([BookName], [BookIntro], [BookPrice]) VALUES (@BookName, @BookIntro, @BookPrice)"
SelectCommand="SELECT * FROM [Table4]"
UpdateCommand="UPDATE [Table4] SET [BookName] = @BookName, [BookIntro] = @BookIntro, [BookPrice] = @BookPrice WHERE [SN] = @SN">
<DeleteParameters>
<asp:Parameter Name="SN" Type="Int32" />
</DeleteParameters>
<InsertParameters>
<asp:Parameter Name="BookName" Type="String" />
<asp:Parameter Name="BookIntro" Type="String" />
<asp:Parameter Name="BookPrice" Type="Int32" />
</InsertParameters>
<UpdateParameters>
<asp:Parameter Name="BookName" Type="String" />
<asp:Parameter Name="BookIntro" Type="String" />
<asp:Parameter Name="BookPrice" Type="Int32" />
<asp:Parameter Name="SN" Type="Int32" />
</UpdateParameters>
</asp:SqlDataSource>
<asp:DetailsView ID="DetailsView1" runat="server" Height="50px" Width="125px" AllowPaging="True"
DefaultMode="Insert"
AutoGenerateRows="False" DataKeyNames="SN" DataSourceID="SqlDataSource1" OnDataBound="DetailsView1_DataBound">
<Fields>
<asp:BoundField DataField="SN" HeaderText="SN" InsertVisible="False" ReadOnly="True" SortExpression="SN" />
<asp:BoundField DataField="BookName" HeaderText="書名" SortExpression="BookName" />
<asp:BoundField DataField="BookIntro" HeaderText="簡介" SortExpression="BookIntro" />
<asp:TemplateField HeaderText="價格" SortExpression="BookPrice">
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("BookPrice") %>'></asp:TextBox>
</EditItemTemplate>
<InsertItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("BookPrice") %>'></asp:TextBox>
<asp:Label ID="Label_BookPrice" runat="server">註解</asp:Label>
</InsertItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("BookPrice") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:CommandField ShowDeleteButton="True" ShowEditButton="True" ShowInsertButton="True" />
</Fields>
</asp:DetailsView>
</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 WebApplication1
{
public partial class Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
// 使用欄位索引編號來隱藏，程式較簡潔，但欄位增減後要改索引麻煩
protected void Button1_Click(object sender, EventArgs e)
{
//DetailsView1.Fields[0].Visible = false; // SN
//DetailsView1.Fields[1].Visible = false; // BookName
DetailsView1.Fields[2].Visible = false; // BoundField，BookIntro
DetailsView1.Fields[3].Visible = false; // TemplateField，BookPrice
}
// BoundField 使用欄位資料名稱 (DataField) 來隱藏欄位
// TemplateField 使用欄位顯示名稱 (HeaderText) 來隱藏欄位
// 程式較麻煩，欄位增減維護較方便
protected void Button2_Click(object sender, EventArgs e)
{
foreach (DataControlField field in DetailsView1.Fields)
{
if (field is BoundField)
{
BoundField boundField = field as BoundField;
if (boundField.DataField == "BookIntro")
{
boundField.Visible = false;
}
}
else if (field is TemplateField)
{
TemplateField templateField = field as TemplateField;
if (templateField.HeaderText == "價格")
{
templateField.Visible = false;
}
}
}
DetailsView1.DataBind();
}
// 直接寫在 DataBound() 的方法
protected void DetailsView1_DataBound(object sender, EventArgs e)
{
//error CS0030: 無法將類型 'System.Web.UI.Control' 轉換成 'System.Web.UI.WebControls.BoundField'
//BoundField bf = (BoundField)DetailsView1.FindControl("BookIntro");
BoundField bf = DetailsView1.Fields.OfType<BoundField>().FirstOrDefault(f => f.DataField == "BookIntro");
//error CS0030: 無法將類型 'System.Web.UI.Control' 轉換成 'System.Web.UI.WebControls.TemplateField'
//TemplateField tf = (TemplateField)DetailsView1.FindControl("BookPrice");
TemplateField tf = (TemplateField)DetailsView1.Fields.Cast<DataControlField>().FirstOrDefault(f => f.HeaderText == "價格");
// 根據控制項的型別設定 Visible 屬性
if (bf != null)
{
bf.Visible = false;
}
if (tf != null)
{
tf.Visible = false;
}
}
//---
// 進階到控制 Cell
/*
protected void DetailsView1_DataBound(object sender, EventArgs e)
{
// 尋找欄位控制項
BoundField field = DetailsView1.Fields[2] as BoundField;
if (field == null)
{
TemplateField tempField = DetailsView1.Fields[2] as TemplateField;
if (tempField != null)
{
// 如果是 TemplateField，尋找其內部的控制項
Label label = DetailsView1.FindControl("簡介") as Label;
if (label != null)
{
// 隱藏控制項
label.Visible = false;
}
}
}
else
{
// 如果是 BoundField，尋找其對應的 TableCell
TableCell cell0 = DetailsView1.Rows[2].Cells[0]; //欄位名稱，一但隱藏，欄位值會偏移到欄位名稱位置
TableCell cell1 = DetailsView1.Rows[2].Cells[1]; //欄位值
if (cell0 != null)
{
// 隱藏 TableCell
cell1.Visible = false;
}
}
//---
TemplateField tempField3 = DetailsView1.Fields[3] as TemplateField;
if (tempField3 != null)
{
// 如果是 TemplateField，尋找其內部的控制項
Label label = (Label)DetailsView1.FindControl("Label_BookPrice");
if (label != null)
{
// 隱藏控制項
label.Visible = false;
}
}
}
*/
//---
}
}
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