public class Car
{
    public string Id { get; set; }

public class Car
{
   public string CarId { get; set; }

public class Car
{
   [Key]
   public string LicensePlate { get; set; }

public class MyContext : DbContext
{
    public DbSet<Car> Cars { get; set; }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
         modelBuilder.Entity<Car>()
                 .HasKey(c => c.LicensePlate);
    }
 }

{
   "dependencies": {
          "System.ComponentModel.Annotations": "4.1.0"
   }
}

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
   modelBuilder.Entity<Car>()
                       .HasKey(c => new { c.State, c.LicensePlate });
}

public class Blog
{
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public int BlogId { get; set; }

    public string Url { get; set; }
}

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder.Entity<Blog>()
           .Property(b => b.BlogId)
           .ValueGeneratedNever();
}

public class Blog
{
   public int BlogId { get; set; }
   public string Url { get; set; }

   [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
   public DateTime Inserted { get; set; }
}

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder.Entity<Blog>()
           .Property(b => b.Inserted)
           .ValueGeneratedOnAdd();
}

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder.Entity<Blog>()
        .Property(b => b.Inserted)
        .HasDefaultValueSql("getdate()");
}

public class Blog
{
    public int BlogId { get; set; }
    public string Url { get; set; }

    [DatabaseGenerated(DatabaseGeneratedOption.Computed)]
    public DateTime LastUpdated { get; set; }
}

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder.Entity<Blog>()
       .Property(b => b.LastUpdated)
       .ValueGeneratedOnAddOrUpdate();
}

public class Person
{
    public int PersonId { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string DisplayName { get; set; }
}

public class MyContext : DbContext
{
    public DbSet<Person> People { get; set; }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
          modelBuilder.Entity<Person>()
              .Property(p => p.DisplayName)
               .HasComputedColumnSql("[LastName] + ', ' + [FirstName]");
     }
 }

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
     modelBuilder.HasSequence<int>("OrderNumbers", schema: "shared") 
           .StartsAt(1000).IncrementsBy(5);

     modelBuilder.Entity<Order>()
         .Property(o => o.OrderNo)
         .HasDefaultValueSql("NEXT VALUE FOR shared.OrderNumbers");
}

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder.HasSequence<int>("PrimaryKeyWithSequenceSequence");
    modelBuilder.Entity<PrimaryKeyWithSequence>(entity =>
     {
       entity.Property(e => e.PrimaryKeyWithSequenceId).HasDefaultValueSql("NEXT VALUE FOR [PrimaryKeyWithSequenceSequence]");
     });
}

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
      modelBuilder.Entity<Blog>()
          .HasIndex(b => b.Url)
          .HasName("Index_Url");

 modelBuilder.Entity<Blog>().HasIndex(b => b.Url).HasName("Index_Url").IsUnique();

modelBuilder.Entity<Person>()
   .HasIndex(idx => new { idx.FirstName, idx.LastName })
   .IsUnique();

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
   modelBuilder.Entity<Car>()
     .HasAlternateKey(c => c.LicensePlate)
     .HasName("AlteranteKey_LicensePlate");
}

modelBuilder.Entity<Person>()
     .HasAlternateKey(x => new { x.FirstName, x.LastName });

 table.UniqueConstraint("AK_Persons_FirstName_LastName", x => new { x.FirstName, x.LastName });

[HttpGet]
public async Task<IActionResult> Challenge(string provider, string returnUrl)

[HttpGet]
public async Task<IActionResult> Callback()

namespace DNT.IDP
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.Configure<IISOptions>(iis =>
            {
                iis.AuthenticationDisplayName = "Windows Account";
                iis.AutomaticAuthentication = false;
            });

        public ExternalController(
            IIdentityServerInteractionService interaction,
            IClientStore clientStore,
            IEventService events,
            TestUserStore users = null)
        {
            _users = users ?? new TestUserStore(TestUsers.Users);

            _interaction = interaction;
            _clientStore = clientStore;
            _events = events;
        }

        private readonly IUsersService _usersService;
        public ExternalController(
    // ...
            IUsersService usersService)
        {
    // ...
            _usersService = usersService;
        }

 var user = _users.FindByExternalProvider(provider, providerUserId);

 var user = await _usersService.GetUserByProviderAsync(provider, providerUserId);

 private async Task<(User user, string provider, string providerUserId, IEnumerable<Claim> claims)> FindUserFromExternalProvider(AuthenticateResult result)

private TestUser AutoProvisionUser(string provider, string providerUserId, IEnumerable<Claim> claims)
{
   var user = _users.AutoProvisionUser(provider, providerUserId, claims.ToList());
   return user;
}

[HttpGet]
public IActionResult RegisterUser(string returnUrl)

namespace DNT.IDP.Controllers.UserRegistration
{
    public class RegistrationInputModel
    {
        public string ReturnUrl { get; set; }
        public string Provider { get; set; }
        public string ProviderUserId { get; set; }

        public bool IsProvisioningFromExternal => !string.IsNullOrWhiteSpace(Provider);
    }
}

namespace DNT.IDP.Controllers.Account
{
    [SecurityHeaders]
    [AllowAnonymous]
    public class ExternalController : Controller
    {
        public async Task<IActionResult> Callback()
        {
            var result = await HttpContext.AuthenticateAsync(IdentityServer4.IdentityServerConstants.ExternalCookieAuthenticationScheme);
            var returnUrl = result.Properties.Items["returnUrl"] ?? "~/";

            var (user, provider, providerUserId, claims) = await FindUserFromExternalProvider(result);
            if (user == null)
            {
                // user = AutoProvisionUser(provider, providerUserId, claims);
                
                var returnUrlAfterRegistration = Url.Action("Callback", new { returnUrl = returnUrl });
                var continueWithUrl = Url.Action("RegisterUser", "UserRegistration" ,
                    new { returnUrl = returnUrlAfterRegistration, provider = provider, providerUserId = providerUserId });
                return Redirect(continueWithUrl);
            }

namespace DNT.IDP.Controllers.UserRegistration
{
    public class UserRegistrationController : Controller
    {
        [HttpGet]
        public IActionResult RegisterUser(RegistrationInputModel registrationInputModel)
        {
            var vm = new RegisterUserViewModel
            {
                ReturnUrl = registrationInputModel.ReturnUrl,
                Provider = registrationInputModel.Provider,
                ProviderUserId = registrationInputModel.ProviderUserId
            };

            return View(vm);
        }

namespace DNT.IDP.Controllers.UserRegistration
{
    public class RegisterUserViewModel : RegistrationInputModel
    {

<inputtype="hidden"asp-for="ReturnUrl"/>
<inputtype="hidden"asp-for="Provider"/>
<inputtype="hidden"asp-for="ProviderUserId"/>

@if (!Model.IsProvisioningFromExternal)
{
    <div>
        <label asp-for="Password"></label>
        <input type="password" placeholder="Password"
               asp-for="Password" autocomplete="off">
    </div>
}

namespace DNT.IDP.Controllers.UserRegistration
{
    public class UserRegistrationController : Controller
    {
        [HttpPost]
        [ValidateAntiForgeryToken]
        public async Task<IActionResult> RegisterUser(RegisterUserViewModel model)
        {
    // ...
            
            if (model.IsProvisioningFromExternal)
            {
                userToCreate.UserLogins.Add(new UserLogin
                {
                    LoginProvider = model.Provider,
                    ProviderKey = model.ProviderUserId
                });
            }

            // add it through the repository
            await _usersService.AddUserAsync(userToCreate);

// ...
        }
    }

if (!model.IsProvisioningFromExternal)
{
    // log the user in
    // issue authentication cookie with subject ID and username
    var props = new AuthenticationProperties
    {
        IsPersistent = false,
        ExpiresUtc = DateTimeOffset.UtcNow.Add(AccountOptions.RememberMeLoginDuration)
    };
    await HttpContext.SignInAsync(userToCreate.SubjectId, userToCreate.Username, props);
}

@page "/"

@page "/"

<p>Hello, @name</p>

@code
{
    string name = "Vahid N.";
}

 <p>Hello, @name.ToUpper()</p>

@page "/"

<p>Hello, @name.ToUpper()</p>
<p>Hello, @CustomToUpper(name)</p>

@code
{
    string name = "Vahid N.";

    string CustomToUpper(string value) => value.ToUpper();
}

<p>Let's add 2 + 2 : @2 + 2 </p>

<p>Let's add 2 + 2 : @(2 + 2) </p>

<button @onclick="@(()=>Console.WriteLine("Test"))">Click me</button>

@page "/"

<button @onclick="@WriteLog">Click me 2</button>

@code
{
    void WriteLog()
    {
        Console.WriteLine("Test");
    }
}

@page "/"

<button @onclick="@(()=>WriteLogWithParam("Test 3"))">Click me 3</button>

@code
{
    void WriteLogWithParam(string value)
    {
        Console.WriteLine(value);
    }
}

BlazorRazorSample\Client\Pages\Index.razor(12,25): error CS1501: No overload for method 'WriteLog' takes 1 arguments

@page "/"

<p>Hello, @StringUtils.MyCustomToUpper(name)</p>

@code
{
    public class StringUtils
    {
        public static string MyCustomToUpper(string value) => value.ToUpper();
    }
}

namespace BlazorRazorSample.Shared
{
    public class StringUtils
    {
        public static string MyNewCustomToUpper(string value) => value.ToUpper();
    }
}

@page "/"

@using BlazorRazorSample.Shared

<p>Hello, @StringUtils.MyNewCustomToUpper(name)</p>

@using BlazorRazorSample.Shared

using System;

namespace BlazorRazorSample.Shared.Models
{
    public class MovieDto
    {
        public string Title { set; get; }

        public DateTime ReleaseDate { set; get; }
    }
}

@using BlazorRazorSample.Shared.Models

@page "/"

<div>
    <h3>Movies</h3>
    @foreach(var movie in movies)
    {
        <p>Title: <b>@movie.Title</b></p>
        <p>ReleaseDate: @movie.ReleaseDate.ToString("dd MMM yyyy")</p>
    }
</div>

@code
{
    List<MovieDto> movies = new List<MovieDto>
    {
        new MovieDto
        {
            Title = "Movie 1",
            ReleaseDate = DateTime.Now.AddYears(-1)
        },
        new MovieDto
        {
            Title = "Movie 2",
            ReleaseDate = DateTime.Now.AddYears(-2)
        },
        new MovieDto
        {
            Title = "Movie 3",
            ReleaseDate = DateTime.Now.AddYears(-3)
        }
    };
}

    @for(var i = 0; i < movies.Count; i++)
    {
        <div style="background-color: @(i % 2 == 0 ? "blue" : "red")">
            <p>Title: <b>@movies[i].Title</b></p>
            <p>ReleaseDate: @movies[i].ReleaseDate.ToString("dd MMM yyyy")</p>
        </div>
    }

@page "/fetchdata"
@using BlazorRazorSample.Shared
@inject HttpClient Http

<h1>Weather forecast</h1>

<p>This component demonstrates fetching data from the server.</p>

@if (forecasts == null)
{
    <p><em>Loading...</em></p>
}
else
{
    <table class="table">
        <thead>
            <tr>
                <th>Date</th>
                <th>Temp. (C)</th>
                <th>Temp. (F)</th>
                <th>Summary</th>
            </tr>
        </thead>
        <tbody>
            @foreach (var forecast in forecasts)
            {
                <tr>
                    <td>@forecast.Date.ToShortDateString()</td>
                    <td>@forecast.TemperatureC</td>
                    <td>@forecast.TemperatureF</td>
                    <td>@forecast.Summary</td>
                </tr>
            }
        </tbody>
    </table>
}

@code {
    private WeatherForecast[] forecasts;

    protected override async Task OnInitializedAsync()
    {
        forecasts = await Http.GetFromJsonAsync<WeatherForecast[]>("WeatherForecast");
    }

}

@if (forecasts == null)
{
    <p><em>Loading...</em></p>
}

new MovieDto
{
   Title = "<i>Movie 1</i>",
   ReleaseDate = DateTime.Now.AddYears(-1)
},

<p>Title: <b>@((MarkupString)movie.Title)</b></p>

Install-Package Microsoft.AspNet.WebApi.HelpPage

@Html.ActionLink("API", "Index", "Help", new { area = "" }, null)

protected void Application_Start()
{
    // Add this code, if not present.
    AreaRegistration.RegisterAllAreas();

    // ...
}

config.SetDocumentationProvider(new XmlDocumentationProvider(
    HttpContext.Current.Server.MapPath("~/App_Data/XmlDocument.xml")));

/// <summary>
/// Gets some very important data from the server.
/// </summary>
public IEnumerable<string> Get()
{
    return new string[] { "value1", "value2" };
}

/// <summary>
/// Looks up some data by ID.
/// </summary>
/// <param name="id">The ID of the data.</param>
public string Get(int id)
{
    return "value";
}

[ApiExplorerSettings(IgnoreApi=true)]
public HttpResponseMessage Get(int id) {  }