如何在 C# 中使用 SQLite、MVVM 进行授权答案

【问题标题】：How to make authorization using SQLite , MVVM in C#如何在 C# 中使用 SQLite、MVVM 进行授权
【发布时间】：2021-02-21 08:37:45
【问题描述】：

我有 2 个独立的项目，注册和登录主窗口，我绑定到同一个 SQLite 文件。用户注册一切都很好，但现在我需要登录能够正常工作。如何从BD中提取用户并使用MVVM检查该用户是否存在以及密码是否一致？

我开始创建 2 个类

public class ServiceResult
{
    public bool IsSucceed { get; set; }
    public string Error { get; set; }
    public ServiceResult()
    {
        IsSucceed = true;
    }

    public ServiceResult(string error)
    {
        IsSucceed = false;
        Error = error;
    }
}

和

public class AuthorizationService
{

    public ServiceResult Login(string login,string password)
    {
        ApplicationDbContext db= new ApplicationDbContext();
        return new ServiceResult();
    }
}

我的注册视图模型

public class RegisterViewModel : BaseViewModel
{
    Hashing hashing = new Hashing();
    ApplicationDbContext db;
    private string name;
    public string Name
    {
        get => name;
        set
        {
            name = value;
            OnPropertyChanged(nameof(Name));
        }
    }
    private string lastName;
    public string LastName
    {
        get => lastName;
        set
        {
            lastName = value;
            OnPropertyChanged(nameof(LastName));
        }
    }
    private string login;
    public string Login
    {
        get => login;
        set
        {
            login = value;
            OnPropertyChanged(nameof(Login));
        }
    }

    private string password;
    public string Password
    {
        get { return password; }
        set
        {
            if (password != value)
            {
                password = value;
                OnPropertyChanged("Password");
            }
        }
    }
    private string mail;
    public string Mail
    {
        get => mail;
        set
        {
            mail = value;
            OnPropertyChanged(nameof(Mail));
        }
    }



    public ICommand Command { get; set; }

    private RelayCommand registerCommand;
    public RelayCommand RegisterCommand
    {
        get
        {
            return registerCommand ??
                (registerCommand = new RelayCommand(() =>
                {
                    var _user = new RegisterUser(Name, LastName, Login, hashing.Encrypt(Password), Mail);
                    db.Users.Add(_user);
                    db.SaveChanges();
                }));
        }
    }

    public ObservableCollection<User> Users { get; set; }
    public RegisterViewModel()
    {
        db = new ApplicationDbContext();
    }
}

这是登录视图模型

 ApplicationDbContext db;
    IEnumerable<User> users;

    public LoginViewModel(IViewFactory viewFactory, ICore core) : base(viewFactory)
    {
        db = new ApplicationDbContext();
    }

    public ICommand Command { get; set; }

    private string login;
    public string Login
    {
        get => login;
        set
        {
            login = value;
            RaisePropertyChanged(nameof(Login));
        }
    }
    private string password;
    public string Password
    {
        get => password;
        set
        {
            password = value;
            RaisePropertyChanged(nameof(Password));
        }
    }

    private RelayCommand addCommand;
    public RelayCommand AddCommand
    {
        get
        {
            return addCommand ??
                (addCommand = new RelayCommand(() =>
                {
                }));
        }
    }

    public IEnumerable<User> Users
    {
        get { return users; }
        set
        {
            users = value;
            RaisePropertyChanged("Users");
        }
    }
}

【问题讨论】：

标签： c# wpf sqlite mvvm

【解决方案1】：

我完成了，这很容易）

public class AuthorizationService
{
    ApplicationDbContext db = new ApplicationDbContext();
    public ServiceResult Login(string login,string password)
    {
        var listUsers= db.Users.ToList();
        foreach (var item in listUsers)
        {
            if (item.Login == login || item.Password == password)
            {
                return new ServiceResult();
            }
        }
        return new ServiceResult("Wrong Login or Password!");
    }
}

和登录视图模型

private RelayCommand loginUser;
    public RelayCommand LoginUser
    {
        get
        {
            return loginUser ??
                (loginUser = new RelayCommand(() =>
                {
                    var result = _authorizationService.Login(Login, hashing.Encrypt(Password));
                }));
        }
    }

【讨论】：