这个错误
"'gv' does not exist in the current context"
在我尝试加载 gridview 时显示。 这是我第一次看到该错误。 我做了很多工作来解决这个错误，但没有成功。 我需要做什么来解决这个错误并加载 GridView 。 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 Inherits 的值设置为您的类的名称:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="usageDisp.aspx.cs" Inherits="WebApplication1.usageDisp" %>
来自 MSDN :
Inherits - Defines a code-behind class for the page to inherit. This can be any class derived from the Page class. This attribute is used with the CodeFile attribute, which contains the path to the source file for the code-behind class. The Inherits attribute is case-sensitive when using C# as the page language, and case-insensitive when using Visual Basic as the page language.
关于c# - Gridview 在当前上下文中不存在，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32482080/