所以我有一个 ASP.NET 网站（不是 Web 应用程序），我在 VS2010 中使用 C# 制作。它在我的机器上运行良好，但是当我将它上传到它所在的站点时，它不会编译，给出：“CS0246：找不到类型或命名空间名称'DataAccess'（您是否缺少 using 指令或装配参考？）”
我一直在使用 VS 中的复制网站功能，直到我想将自己的类放在 App_Code 文件夹中并使用它之前都没有问题。我在其他答案中阅读了有关将 .cs 属性更改为“编译”而不是“内容”的信息，但在文件的属性中没有适合我的选项......只有文件名、完整路径和自定义工具。这是 .cs 文件中的代码：
using System;
using System.Data;
using System.Data.SqlClient;
using System.Web.Configuration;
/// <summary>
/// Provides access to SQL Server database.
/// </summary>
///
public class DataAccess
{
//Variables & public properties ***********************************
private string connectionString = "";
private int recordCount = -1;
/// <summary>
/// Property: gets count of records retrieved or changed
/// </summary>
public int Count
{
get
{
return recordCount;
}
}
//Class constructor is executed when object is initialized ***********
/// <summary>
/// Connection string name in web.config file is required to initialize DataAccess
/// </summary>
/// <param name="ConnectionName">Name of web.config connection string</param>
public DataAccess(string ConnectionName)
{
if (WebConfigurationManager.ConnectionStrings[ConnectionName] == null) {
throw new Exception("Cannot find connection string named '" +
ConnectionName + "' in web.config");
}
//Get connection string from web.config.
connectionString = WebConfigurationManager.ConnectionStrings[ConnectionName].ConnectionString;
}
/// <summary>
/// Executes SELECT statement and returns results in dataTable
/// </summary>
/// <param name="SQL">Select SQL statement</param>
/// <returns></returns>
public DataTable FillDataTable(string SQL)
{
SqlConnection _objConn = new SqlConnection(connectionString);
SqlDataAdapter objAdapter = new SqlDataAdapter(SQL, _objConn);
DataTable dt = new DataTable();
try {
objAdapter.Fill(dt);
}
catch (SqlException ex) {
throw new Exception("Error in SQL:" + SQL, ex);
}
catch (Exception ex) {
throw ex; //Bubbling exception up to parent class
}
finally {
_objConn.Close();
}
recordCount = dt.Rows.Count;
return dt;
}
/// <summary>
/// Executes "non-query" SQL statements (insert, update, delete)
/// </summary>
/// <param name="SQL">insert, update or delete</param>
/// <returns>Number of records affected</returns>
public int ExecuteNonQuery(string SQL)
{
SqlConnection _objConn = new SqlConnection(connectionString);
try {
_objConn.Open();
SqlCommand objCmd = new SqlCommand(SQL, _objConn);
recordCount = objCmd.ExecuteNonQuery();
}
catch (SqlException ex) {
throw new Exception("Error in SQL:" + SQL, ex);
}
catch (Exception ex) {
throw new Exception(ex.Message); //Rethrowing exception up to parent class
}
finally { _objConn.Close(); }
return recordCount;
}
public int ExecuteScalar(String SQL)
{
SqlConnection _objConn = new SqlConnection(connectionString);
int intID;
try {
_objConn.Open();
SqlCommand objCmd = new SqlCommand(SQL, _objConn);
intID = Convert.ToInt32(objCmd.ExecuteScalar());
}
catch (SqlException ex) {
throw new Exception("Error in SQL:" + SQL, ex);
}
catch (Exception ex) {
throw new Exception(ex.Message); //Rethrowing exception up to parent class
}
finally { _objConn.Close(); }
return intID;
}
}//end class
从我的页面：
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
//Initialize dataAccess class
DataAccess myDA = new DataAccess("A05Customers");
//Populate dataTable and bind to GridView Control
string strSQL = "Select * from tblCustomers";
gvCustomers.DataSource = myDA.FillDataTable(strSQL);
gvCustomers.DataBind();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>GridView</title>
</head>
<body>
<form id="form1" runat="server">
<div align="center" style="font-family: Verdana">
<h2>GridView</h2>
<hr style="color: #0000FF" width="800" />
<br />
<asp:GridView ID="gvCustomers" runat="server" BackColor="#FFFFCC" BorderColor="#336699" BorderStyle="Inset" BorderWidth="5px" CellPadding="2" CellSpacing="4" />
<br />
</div>
</form>
</body>
</html>
谢谢你的帮助！