这个错误
“GV”在当前语境中不存在
在尝试加载gridview时显示。
这是我第一次看到这个错误。
为了解决这个错误，我做了很多工作，但没有成功。
我需要做什么来消除这个错误并加载网格视图。
谢谢。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using MySql.Data.MySqlClient;
namespace WebApplication1
{
public partial class usageDisp : System.Web.UI.Page
{
string connectionstring = @"Data Source=localhost; Database=globaldotdb; user ID=root; Password=peleg1708";
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
//check
BindData();
}
}
private void BindData()
{
using (MySqlConnection cn = new MySqlConnection(connectionstring))
{
MySqlDataAdapter adp = new MySqlDataAdapter(("SELECT tblusage.codeUsage,tblcustom.Customer, tblvendor.Vendor, tblusage.dateStart, tblusage.dateEnd, tblregion.Region, tblservice.Service, tblservice.unit, tblusage.isSecure,tblusage.Usage FROM ((((tblvendor INNER JOIN tblusage ON tblvendor.codeVendor = tblusage.codeVendor) INNER JOIN tblservice ON tblusage.codeService = tblservice.codeService) INNER JOIN tblregion ON tblusage.codeRegion = tblregion.codeRegion) INNER JOIN tblcustom ON tblusage.codeCust = tblcustom.codeCust)"), cn);
DataTable dt = new DataTable();
adp.Fill(dt);
if (dt.Rows.Count > 0)
{
gv.DataSource = dt;
gv.DataBind();
}
}
}
}
}
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="usageDisp.aspx.cs" Inherits="WebApplication1.WebForm1" %>
<!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">
<title></title>
</head>
<body>
<form id="usageDisp" runat="server">
<asp:GridView ID="gv" runat="server" AutoGenerateColumns="False"
DataKeyNames="codeUsage">
<Columns>
<asp:TemplateField HeaderText="codeusage" Visible="False">
<EditItemTemplate>
<asp:TextBox ID="txtcode" runat="server" Text='<%# Eval("codeUsage") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Eval("codeUsage") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Customer">
<EditItemTemplate>
<asp:TextBox ID="TXTCust" runat="server" Text='<%# Eval("Customer") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%# Eval("Customer") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Vendor">
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Eval("Vendor") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label3" runat="server" Text='<%# Eval("codeVendor") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="dateStart">
<EditItemTemplate>
<asp:TextBox ID="TXTDS" runat="server" Text='<%# Eval("dateStart") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label4" runat="server" Text='<%# Eval("dateStart") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="dateEnd">
<EditItemTemplate>
<asp:TextBox ID="TXTDE" runat="server" Text='<%# Eval("dateEnd") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label5" runat="server" Text='<%# Eval("dateEnd") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="service">
<EditItemTemplate>
<asp:TextBox ID="TXTSe" runat="server" Text='<%# Eval("Service") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label6" runat="server" Text='<%# Eval("Service") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="region">
<EditItemTemplate>
<asp:TextBox ID="TXTRe" runat="server" Text='<%# Eval("Region") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label7" runat="server" Text='<%# Eval("Region") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="isSecure">
<EditItemTemplate>
<asp:TextBox ID="TXTIS" runat="server" Text='<%# Eval("isSecure") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label8" runat="server" Text='<%# Eval("isSecure") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="unit">
<EditItemTemplate>
<asp:TextBox ID="TXTunit" runat="server" Text='<%# Eval("unit") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label9" runat="server" Text='<%# Eval("unit") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="usage">
<EditItemTemplate>
<asp:TextBox ID="TXTusage" runat="server" Text='<%# Eval("Usage") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label10" runat="server" Text='<%# Eval("Usage") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<div>
</div>
</form>
</body>
</html>
最佳答案
尝试将继承值设置为类的名称：
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="usageDisp.aspx.cs" Inherits="WebApplication1.usageDisp" %>
从MSDN：
继承-为要继承的页定义代码隐藏类。这个罐头
是从页类派生的任何类。此属性用于
CodeFile属性，它包含
代码隐藏类。当
使用C#作为页面语言，在使用Visual时不区分大小写
基本页语言。