C# Login XML 循环错误密码

Question

我在使用 C# 和从 XML 文件加载时遇到小问题。（只是一个通知 - 学生项目）

我正在使用 XML 制作登录表单，如果 XML 文件中只有一个帐户，这很好用，但如果有更多帐户，如果我 select除了第一个程序之外的任何程序都会加载一个帐户，然后循环 X 次并说 "Wrong username or password"

    public static bool Login(bool UserExists)
{
    string sUsername;
    string sPassword;
    string check;
    int nPick;

    Console.WriteLine("Insert username: ");
    sUsername = Console.ReadLine();
    Console.WriteLine("Insert password: ");
    sPassword = Console.ReadLine();

    List<User> lUser = GetUsers();
    for (int i = 0; i < lUser.Count(); i++)
    {
        if (lUser[i].username == sUsername && lUser[i].password == sPassword)
        {
            UserExists = true;
            Console.WriteLine("\n Login successfull!");
            do
            {
                Menu();
                check = Console.ReadLine();
                int.TryParse(check, out nPick);
                switch (nPick)
                {
                    case 1:

                        break;
                    case 2:

                        break;
                    case 3:

                        break;
                    case 4:

                        break;
                    case 5:
                        System.Environment.Exit(0);
                        break;
                    default:
                        Console.WriteLine("\n Option not existing!");
                        break;
                }
            }
            while (nPick != 5);
        }
        else
        {
            Console.WriteLine("\n Wrong username or password!\n");
        }
    }
    return UserExists; 
} 

    public static List<User> GetUsers() {
        List<User> lUser = new List<User>();
        string sXml = "";
        StreamReader oSr = new StreamReader("X");
        using (oSr)
        {
            sXml = oSr.ReadToEnd();
        }
        XmlDocument oXml = new XmlDocument();
        oXml.LoadXml(sXml);
        XmlNodeList oNodes = oXml.SelectNodes("//data/user");
        foreach (XmlNode oNode in oNodes)
        {
            string u = oNode["username"].InnerText;
            string p = oNode["password"].InnerText;
            User oUser = new User(u, p); lUser.Add(oUser);
        }
        return lUser;
    }

编辑 1：添加了 XML

<data>
  <user>
    <username>admin</username>
    <password>admin</password>
  </user>
  <user>
    <username>user</username>
    <password>user</password>
  </user>
  <user>
    <username>user1</username>
    <password>user1</password>
  </user>
  <user>
    <username>user2</username>
    <password>user2</password>
  </user>
</data>

例如

1) 如果我输入 "admin" "admin" 组合，程序将进入菜单

2) 如果我输入"user1" "user1" 会登录，还要写3次"Wrong username/password"

Answer 1

你离答案很近了。您可能希望遍历每个用户，并且仅在 none 匹配的情况下才打印错误消息。

请注意，我还将 UserExists 布尔值移到了函数变量中，而不是将其作为参数。

public static bool Login()
{
    string sUsername;
    string sPassword;
    string check;
    int nPick;
    bool UserExists = false;

    Console.WriteLine("Insert username: ");
    sUsername = Console.ReadLine();
    Console.WriteLine("Insert password: ");
    sPassword = Console.ReadLine();

    List<User> lUser = GetUsers();
    for (int i = 0; i < lUser.Count(); i++)
    {
        if (lUser[i].username == sUsername && lUser[i].password == sPassword)
        {
            UserExists = true;
            Console.WriteLine("\n Login successfull!");
            do
            {
                Menu();
                check = Console.ReadLine();
                int.TryParse(check, out nPick);
                switch (nPick)
                {
                    case 1:

                        break;
                    case 2:

                        break;
                    case 3:

                        break;
                    case 4:

                        break;
                    case 5:
                        System.Environment.Exit(0);
                        break;
                    default:
                        Console.WriteLine("\n Option not existing!");
                        break;
                }
            }
            while (nPick != 5);
        }
    }
    if (!UserExists) {
        Console.WriteLine("\n Wrong username or password!\n");
    }
    return UserExists; 
}

C# Login XML 循环错误密码

C# Login XML looping wrong password

c#

xml

loops

streamreader