c# - 使用 System.IO.File，检查文本文件是否包含确切的字符串而不是它的一部分

Question

所以我正在制作一个程序，允许您注册然后使用控制台登录。由于控制台只能在其中存储数据，只要它没有关闭（据我所知），我使用 .txt 文件。我写了一些代码，当你登录时，它应该检查其他人是否已经在使用你想要的用户名，但问题是，例如，如果某人的用户名是“Manly”，而下一个人希望他们的名字是“Man ” 它表示用户名已经存在，因为“Man”存在于 (Man-“ly”)“Manly”中，如果你知道我在说什么的话。

这是我的 VS 项目中的一个类。

using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;

namespace RegisterAndLogin
{
    class Register
    {
        public string UserName { get; set; }
        public string Password { get; set; }

        public void Registration()
        {
            Console.WriteLine("Hello user! Enter the username you want to register with.");
            UserName = Console.ReadLine();

            string UserNamesInFile = File.ReadAllText(@"C:\Users\KIRCA\Documents\C# with Denis Panjuta\Usernames.txt");
            if (UserNamesInFile.Contains(UserName))
            {
                Console.WriteLine("The username you entered is already being used. Try a new one.");
                while (UserNamesInFile.Contains(UserName))
                {
                    Console.WriteLine("Hello user! Enter the username you want to register with.");
                    UserName = Console.ReadLine();
                }
            }

            Console.WriteLine("Now enter the password you want to register with.");
            Password = Console.ReadLine();

            using (StreamWriter file = new StreamWriter(@"C:\Users\KIRCA\Documents\C# with Denis Panjuta\Usernames.txt", true))
            {
                file.WriteLine(UserName);
            }

            using (StreamWriter file1 = new StreamWriter(@"C:\Users\KIRCA\Documents\C# with Denis Panjuta\Passwords.txt", true))
            {
                file1.WriteLine(Password);
            }

            Console.WriteLine("You are succesfully registered");
            Console.WriteLine("-----------------------------------------------------------------------");   

            
        }
    }
}

我建议将代码复制粘贴到 net.framework、控制台 c#、VS 项目中并检查它以了解我在说什么。

这是我拥有的其余代码。

名为登录的类：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;

namespace RegisterAndLogin
{
    class Login
    {
        public string LoginUserName { get; set; }
        public string LoginPassword { get; set; }
        public void LoginMethod()
        {
            Console.WriteLine("Hello again user! Enter your username.");
            LoginUserName = Console.ReadLine();

            string UserNameFileContents = File.ReadAllText(@"C:\Users\KIRCA\Documents\C# with Denis Panjuta\Usernames.txt");

            if (UserNameFileContents.Contains(LoginUserName))
            {
                Console.WriteLine("Username is correct. ");
            }
            else
            {
                Console.WriteLine("Username is incorrect! ");
            }

            Console.WriteLine("Now enter your password. ");
            LoginPassword = Console.ReadLine();

            string PasswordFileContents = File.ReadAllText(@"C:\Users\KIRCA\Documents\C# with Denis Panjuta\Passwords.txt");

            if (PasswordFileContents.Contains(LoginPassword))
            {
                Console.WriteLine("Password is also correct. Press any key to continue to homepage. ");
                Console.ReadLine();
            }
            else
            {
                Console.WriteLine("Password is incorrect. ");
            }
        }
    }
}

主程序代码 program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace RegisterAndLogin
{
    class Program
    {
        static void Main(string[] args)
        {
            Register registration = new Register();
            Login login = new Login();
            Console.WriteLine("Enter 1 to register or enter 2 to login.");
            string UserNumberInput = Console.ReadLine();
            if(UserNumberInput == "1")
            {
                registration.Registration();

                Console.WriteLine("You may now login.");
                login.LoginMethod();
            }
            else if(UserNumberInput == "2")
            {
                login.LoginMethod();
            }
            else
            {
                Console.WriteLine("Enter 1 or 2 only.\nNumber or letter is invalid");
                while(UserNumberInput != "1" && UserNumberInput != "2")
                {
                    Console.WriteLine("Enter 1 to register or enter 2 to login.");
                    UserNumberInput = Console.ReadLine();
                    Console.WriteLine("--------------------------------------------------");
                }
                if (UserNumberInput == "1")
                {
                    registration.Registration();

                    Console.WriteLine("You may now login.");
                    login.LoginMethod();
                }
                else if (UserNumberInput == "2")
                {
                    login.LoginMethod();
                }
            }

            Console.ReadLine();
            
        }
    }
}```

标签： c#visual-studioconsole