User Registration and Login [written by Gabs]

A very simple membership class library for your .NET/C# application with Entity Framework 6 Code-First.

User.cs

Properties

Property	Type	Description
Id	`int`	A database-generated unique number which identifies the user
Email	`string`	Unique username or email
Password Hash/Salt	`byte[]`	Encrypted password data [read only]
LastLogin	Nullable `DateTime`	The last successful login of the user
Roles	`string`	Comma-separated role(s) of a user
UserProfiles	any	You can add more user profile data e.g. FirstName, LastName, BirthDate, Gender, Phone, Address, etc

Public Static Methods

Method	Type	Description
Create(User, strUserPassword, optional requiresActivation)	`User`	Creates new `User`. Return `null` if registration fails. requiresActivation set to `true` needs account be activated by the Administrator
Authenticate(userEmail, userPassword)	`bool`	Returns `true` if login is valid
Update(User, optional userPassword, optional newPassword)	`User`	Updates the user. This also serves as ChangePassword if parameter userPass and newPass are not empty
GetAll()	`List<User>`	Returns all users
GetAllUsersInRole(rolename)	`List<User>`	Returns all users belong to a role
GetUserById(id)	`User`	Returns `User` by Id
GetUserByEmail(email)	`User`	Returns `User` by email or username
GetCurrentUser()	`User`	Returns currently logged-in user
GetUserRoles(id or email)	`string[]`	Returns the roles of user as string array
Deactivate()	`User`	Disables user from logging in
Activate()	`User`	Re-enables user

Setup

Copy paste User.cs in your project and set the username and password for the auto-generated default administrator. The code below automatically creates user with username, password, and role set to “admin”.

private const string DEFAULT_ADMIN_LOGIN = "admin";

Then change the type of _db instance to your app DbContext.

 private static MyDbContext _db = new MyDbContext();

In your DbContext class, add database mapping to User class

 public DbSet<User> Users { get; set; }

Execute update-database

Usage

Sign up

public void Register()
{
    if (txtPassword.Text == txtVerifyPass.Text)
    {
        User newUser = new User();
        newUser.Email = txtEmail.Text;
        newUser.FirstName = txtFirstName.Text;
        newUser.LastName = txtLastName.Text;
        newUser.Phone = txtPhone.Text;
        var user = User.Create(newUser, txtPassword.Text);
        if (user != null)
        {
            MessageBox.Show("You have successfully registered. \nUserId: " + user.Id);
            // Logic for successful registration...
        }
        else
            MessageBox.Show("Registration failed.");
    }
    else
        MessageBox.Show("Password is not the same.");

}

Sign in

public void Login()
{
    var valid = User.Authenticate(txtLoginEmail.Text, txtLoginPassword.Text);
    if(valid)
    {
        var currentUser = User.GetCurrentUser();
        MessageBox.Show("Hello " + currentUser.FirstName + ", you have successfully logged in to the system.");
        // Do what you want to do as login is successful...
    }
    else
        MessageBox.Show("Invalid email and/or password.");
}