Question

当我尝试登录我的asp.net网站的管理部分时，我收到以下错误：

尝试为文件C：\ Users \ joshy \ Documents \ Visual Studio 2015 \ WebSites \ nas2 \ App_Data \ nas.mdf附加自动命名的数据库失败。存在具有相同名称的数据库，或者无法打开指定的文件，或者它位于UNC共享上。

**它突出显示了我的connectionclass.cs中的以下代码行

文件：**

Line 113:        try
Line 114:        {
Line 115:            conn.Open();
Line 116:            int amountOfUsers = (int)command.ExecuteScalar();

这是连接class.cs文件的用户部分的代码：

#region Users
    public static User LoginUser(string name, string password)
    {
        //Check if user exists
        string query = string.Format("SELECT COUNT(*) FROM nas.dbo.users WHERE name = '{0}'", name);
        command.CommandText = query;

        try
        {
            conn.Open();
            int amountOfUsers = (int)command.ExecuteScalar();

            if (amountOfUsers == 1)
            {
                //User exists, check if the passwords match
                query = string.Format("SELECT password FROM users WHERE name = '{0}'", name);
                command.CommandText = query;
                string dbPassword = command.ExecuteScalar().ToString();

                if (dbPassword == password)
                {
                    //Passwords match. Login and password data are known to us.
                    //Retrieve further user data from the database
                    query = string.Format("SELECT email, user_type FROM users WHERE name = '{0}'", name);
                    command.CommandText = query;

                    SqlDataReader reader = command.ExecuteReader();
                    User user = null;

                    while (reader.Read())
                    {
                        string email = reader.GetString(0);
                        string type = reader.GetString(1);

                        user = new User(name, password, email, type);
                    }
                    return user;
                }
                else
                {
                    //Passwords do not match
                    return null;
                }
            }
            else
            {
                //User does not exist
                return null;
            }
        }
        finally
        {

            conn.Close();
        }
    }

    public static string RegisterUser(User user)
    {
        //Check if user exists
        string query = string.Format("SELECT COUNT(*) FROM users WHERE name = '{0}'", user.Name);
        command.CommandText = query;

        try
        {
            conn.Open();
            int amountOfUsers = (int)command.ExecuteScalar();

            if (amountOfUsers < 1)
            {
                //User does not exist, create a new user
                query = string.Format("INSERT INTO users VALUES ('{0}', '{1}', '{2}', '{3}')", user.Name, user.Password,
                                      user.Email, user.Type);
                command.CommandText = query;
                command.ExecuteNonQuery();
                return "User registered!";
            }
            else
            {
                //User exists
                return "A user with this name already exists";
            }
        }
        finally
        {
            conn.Close();
        }
    }
    #endregion

更多connectionclass.cs代码：

using System.Collections;
using System.Configuration;
using System.Data.SqlClient;
using Entities;

public static class ConnectionClass
{
    private static SqlConnection conn;
    private static SqlCommand command;
    private static object toursdate;

    static ConnectionClass()
    {
        string connectionString = ConfigurationManager.ConnectionStrings["nas_connect"].ToString();
        conn = new SqlConnection(connectionString);
        command = new SqlCommand("", conn);

任何帮助将不胜感激。

谢谢。

Answer 1

首先请分享整个代码，或者请检查您是否正在尝试打开已关闭的连接。

尝试附加自动命名的数据库以防止文件失败

1 个答案: