无法从C#文件访问asp:TextBox标记:当前上下文中不存在名称"txtUsername"
JAN*_*JAN 3 .net c# asp.net visual-studio-2012 visual-studio-2013
考虑一下aspx:
CS.aspx:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="CS.aspx.cs" Inherits="CS" %>
<!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>
<style type="text/css">
body
{
font-family: Arial;
font-size: 10pt;
}
input
{
width: 200px;
}
table
{
border: 1px solid #ccc;
}
table th
{
background-color: #F7F7F7;
color: #333;
font-weight: bold;
}
table th, table td
{
padding: 5px;
border-color: #ccc;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<table border="0" cellpadding="0" cellspacing="0">
<tr>
<th colspan="3">
Registration
</th>
</tr>
<tr>
<td>
Username
</td>
<td>
<asp:TextBox ID="txtUsername" runat="server" />
</td>
<td>
<asp:RequiredFieldValidator ErrorMessage="Required" ForeColor="Red" ControlToValidate="txtUsername"
runat="server" />
</td>
</tr>
<tr>
<td>
Password
</td>
<td>
<asp:TextBox ID="txtPassword" runat="server" TextMode="Password" />
</td>
<td>
<asp:RequiredFieldValidator ErrorMessage="Required" ForeColor="Red" ControlToValidate="txtPassword"
runat="server" />
</td>
</tr>
<tr>
<td>
Confirm Password
</td>
<td>
<asp:TextBox ID="txtConfirmPassword" runat="server" TextMode="Password" />
</td>
<td>
<asp:CompareValidator ErrorMessage="Passwords do not match." ForeColor="Red" ControlToCompare="txtPassword"
ControlToValidate="txtConfirmPassword" runat="server" />
</td>
</tr>
<tr>
<td>
Email
</td>
<td>
<asp:TextBox ID="txtEmail" runat="server" />
</td>
<td>
<asp:RequiredFieldValidator ErrorMessage="Required" Display="Dynamic" ForeColor="Red"
ControlToValidate="txtEmail" runat="server" />
<asp:RegularExpressionValidator runat="server" Display="Dynamic" ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"
ControlToValidate="txtEmail" ForeColor="Red" ErrorMessage="Invalid email address." />
</td>
</tr>
<tr>
<td>
</td>
<td>
<asp:Button Text="Submit" runat="server" OnClick="RegisterUser" />
</td>
<td>
</td>
</tr>
</table>
</form>
</body>
</html>
和它的C#文件:CS.asps.cs
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 System.Configuration;
using System.Data.SqlClient;
public partial class CS : System.Web.UI.Page
{
protected void RegisterUser(object sender, EventArgs e)
{
int userId = 0;
string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
using (SqlConnection con = new SqlConnection(constr))
{
using (SqlCommand cmd = new SqlCommand("Insert_User"))
{
using (SqlDataAdapter sda = new SqlDataAdapter())
{
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@Username", txtUsername.Text.Trim());
cmd.Parameters.AddWithValue("@Password", txtPassword.Text.Trim());
cmd.Parameters.AddWithValue("@Email", txtEmail.Text.Trim());
cmd.Connection = con;
con.Open();
userId = Convert.ToInt32(cmd.ExecuteScalar());
con.Close();
}
}
string message = string.Empty;
switch (userId)
{
case -1:
message = "Username already exists.\\nPlease choose a different username.";
break;
case -2:
message = "Supplied email address has already been used.";
break;
default:
message = "Registration successful.\\nUser Id: " + userId.ToString();
break;
}
ClientScript.RegisterStartupScript(GetType(), "alert", "alert('" + message + "');", true);
}
}
}
当我尝试编译时,我得到了这个:
当前上下文中不存在名称"txtUsername"
当前上下文中不存在名称"txtPassword"
当前上下文中不存在名称"txtEmail"
知道为什么会这样吗？在txtUsername中声明.aspx文件.
问题在于声明文件.它应该看起来像:
<%@ Page Language="C#"
AutoEventWireup="true"
CodeBehind="CS.aspx.cs"
Inherits="CS" %>
它的.designer.cs文件包含要使用的.cs文件的aspx对象的定义.
通过指定CodeFile您指示您使用的是网站项目类型文件而不是WebForm.
指定CodeBehind而不是CodeFile,这将允许VS将定义添加到.designer.cs文件中.
编辑:
如果您没有.designer文件,可以通过以下方式创建:
- 打开CS.aspx所在的目录.
- 创建一个新的文本文件并将其命名为CS.aspx.designer.cs
- 在
show all files项目中的Visual Studio 中. - 深入研究CS.aspx.cs,你会看到你的文件.
- 将其包含在项目中.
- 改变CS.aspx文件中的内容并保存.
这会将您的文件转换为Webform文件.
看起来@mellamokb有同样的想法.:)