@page "/lifecycle"
@using System.Threading

<div class="border">
    <h3>Lifecycles Parent Component</h3>

    <div class="border">
        <LifecycleChild CountValue="CurrentCount"></LifecycleChild>
    </div>

    <p>Current count: @CurrentCount</p>

    <button class="btn btn-primary" @onclick="IncrementCount">Click me</button>
    <br /><br />
    <button class="btn btn-primary" @onclick=StartCountdown>Start Countdown</button> @MaxCount
</div>

@code
{
    int CurrentCount = 0;
    int MaxCount = 5;

    private void IncrementCount()
    {
        CurrentCount++;
        Console.WriteLine("Parnet - IncrementCount is called");
    }

    protected override void OnInitialized()
    {
        Console.WriteLine("Parnet - OnInitialized is called");
    }

    protected override async Task OnInitializedAsync()
    {
        await Task.Delay(100);
        Console.WriteLine("Parnet - OnInitializedAsync is called");
    }

    protected override void OnParametersSet()
    {
        Console.WriteLine("Parnet - OnParameterSet is called");
    }

    protected override async Task OnParametersSetAsync()
    {
        await Task.Delay(100);
        Console.WriteLine("Parnet - OnParametersSetAsync is called");
    }

    protected override void OnAfterRender(bool firstRender)
    {
        if (firstRender)
        {
            Console.WriteLine("Parnet - OnAfterRender(firstRender == true) is called");
            CurrentCount = 111;
        }
        else
        {
            CurrentCount = 999;
            Console.WriteLine("Parnet - OnAfterRender(firstRender == false) is called");
        }
    }

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        await Task.Delay(100);
        Console.WriteLine("Parnet - OnAfterRenderAsync is called");
    }

    protected override bool ShouldRender()
    {
        Console.WriteLine("Parnet - ShouldRender is called");
        return true;
    }

    void StartCountdown()
    {
        Console.WriteLine("Parnet - StartCountdown()");
        var timer = new Timer(TimeCallBack, null, 1000, 1000);
    }

    void TimeCallBack(object state)
    {
        if (MaxCount > 0)
        {
            MaxCount--;
            Console.WriteLine("Parnet - InvokeAsync(StateHasChanged)");
            InvokeAsync(StateHasChanged);
        }
    }
}

<h3 class="ml-3 mr-3">Lifecycles Child Componenet</h3>

@code
{
    [Parameter]
    public int CountValue { get; set; }

    protected override void OnInitialized()
    {
        Console.WriteLine("  Child - OnInitialized is called");
    }

    protected override async Task OnInitializedAsync()
    {
        await Task.Delay(100);
        Console.WriteLine("  Child - OnInitializedAsync is called");
    }

    protected override void OnParametersSet()
    {
        Console.WriteLine("  Child - OnParameterSet is called");
    }

    protected override async Task OnParametersSetAsync()
    {
        await Task.Delay(100);
        Console.WriteLine("  Child - OnParametersSetAsync is called");
    }

    protected override void OnAfterRender(bool firstRender)
    {
        if (firstRender)
        {
            Console.WriteLine("  Child - OnAfterRender(firstRender == true) is called");
        }
        else
        {
            Console.WriteLine("  Child - OnAfterRender(firstRender == false) is called");
        }
    }

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        await Task.Delay(100);
        Console.WriteLine("  Child - OnAfterRenderAsync is called");
    }

    protected override bool ShouldRender()
    {
        Console.WriteLine("  Child - ShouldRender is called");
        return true;
    }
}

<li class="nav-item px-3">
    <NavLink class="nav-link" href="lifecycle">
        <span class="oi oi-list-rich" aria-hidden="true"></span> Lifecycles
    </NavLink>
</li>

@code
{
    protected override void OnInitialized()
    {
        Console.WriteLine("Parnet - OnInitialized is called");
    }

    protected override async Task OnInitializedAsync()
    {
        await Task.Delay(100);
        Console.WriteLine("Parnet - OnInitializedAsync is called");
    }

<LifecycleChild CountValue="CurrentCount"></LifecycleChild>

Parnet - IncrementCount is called
Parnet - ShouldRender is called
  Child - OnParameterSet is called
  Child - ShouldRender is called
Parnet - OnAfterRender(firstRender == false) is called
  Child - OnAfterRender(firstRender == false) is called
  Child - OnParametersSetAsync is called
  Child - ShouldRender is called
  Child - OnAfterRender(firstRender == false) is called
  Child - OnAfterRenderAsync is called
Parnet - OnAfterRenderAsync is called
  Child - OnAfterRenderAsync is called

@code
{
    protected override void OnAfterRender(bool firstRender)
    {
        if (firstRender)
        {
            Console.WriteLine("Parnet - OnAfterRender(firstRender == true) is called");
            CurrentCount = 111;
        }
        else
        {
            CurrentCount = 999;
            Console.WriteLine("Parnet - OnAfterRender(firstRender == false) is called");
        }
    }

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        await Task.Delay(100);
        Console.WriteLine("Parnet - OnAfterRenderAsync is called");
    }
}

@page "/lifecycle"
@using System.Threading

button class="btn btn-primary" @onclick=StartCountdown>Start Countdown</button> @MaxCount

@code
{
    int MaxCount = 5;

    void StartCountdown()
    {
        Console.WriteLine("Parnet - StartCountdown()");
        var timer = new Timer(TimeCallBack, null, 1000, 1000);
    }

    void TimeCallBack(object state)
    {
        if (MaxCount > 0)
        {
            MaxCount--;
            Console.WriteLine("Parnet - InvokeAsync(StateHasChanged)");
            InvokeAsync(StateHasChanged);
        }
    }
}

<button @onclick="OnClick">Synchronous</button>
<button @onclick="OnClickAsync">Asynchronous</button>
@code{
    void OnClick()
    {
    } // StateHasChanged is called after the method

    async Task OnClickAsync()
    {
        text = "click1";
        // StateHasChanged is called here as the synchronous part of the method ends

        await Task.Delay(1000);
        await Task.Delay(2000);
        text = "click2";
    } // StateHasChanged is called after the method
}

public class IdentityUser<TKey> where TKey : IEquatable<TKey>
{
    [ProtectedPersonalData]
    public virtual string UserName { get; set; }

    [ProtectedPersonalData]
    public virtual string Email { get; set; }

services.AddIdentity<IdentityUser, IdentityRole>(options =>
{
   options.Stores.ProtectPersonalData = true;
   // ...
})

private class PersonalDataConverter : ValueConverter<string, string>
{
  public PersonalDataConverter(IPersonalDataProtector protector) :
      base(s => protector.Protect(s), s => protector.Unprotect(s), default)
      { }
}

        protected override void OnModelCreating(ModelBuilder builder)
        {
            var encryptPersonalData = storeOptions?.ProtectPersonalData ?? false;

            builder.Entity<TUser>(b =>
            {
                if (encryptPersonalData)
                {
                    converter = new PersonalDataConverter(this.GetService<IPersonalDataProtector>());
                    var personalDataProps = typeof(TUser).GetProperties().Where(
                                    prop => Attribute.IsDefined(prop, typeof(ProtectedPersonalDataAttribute)));
                    foreach (var p in personalDataProps)
                    {
                        if (p.PropertyType != typeof(string))
                        {
                            throw new InvalidOperationException(Resources.CanOnlyProtectStrings);
                        }
                        b.Property(typeof(string), p.Name).HasConversion(converter);
                    }
                }
// ...

public interface IPersonalDataProtector
{
   string Protect(string data);
   string Unprotect(string data);
}

if (Options.Stores.ProtectPersonalData)
 {
     if (!(Store is IProtectedUserStore<TUser>))
     {
         throw new InvalidOperationException(Resources.StoreNotIProtectedUserStore);
     }
     if (services.GetService<ILookupProtector>() == null)
     {
         throw new InvalidOperationException(Resources.NoPersonalDataProtector);
     }
 }

 public class UserStore<TUser, TRole, TContext, TKey, TUserClaim, TUserRole, TUserLogin, TUserToken, TRoleClaim> : ...

public virtual async Task UpdateNormalizedUserNameAsync(TUser user)
{
    var normalizedName = NormalizeName(await GetUserNameAsync(user));
    normalizedName = ProtectPersonalData(normalizedName);
    await Store.SetNormalizedUserNameAsync(user, normalizedName, CancellationToken);
}

using System;
using System.IO;
using System.Threading;

namespace Async08
{
    class Program
    {
        static void Main(string[] args)
        {
            var source = @"c:\dir\file.bin";
            var target = @"d:\dir\file.bin";
            using (var inStream = File.OpenRead(source))
            {
                using (var outStream = File.OpenWrite(target))
                {
                    using (var cts = new CancellationTokenSource())
                    {
                        var task = inStream.CopyToAsync(outStream, bufferSize: 4059, cancellationToken: cts.Token);
                        Console.WriteLine("Press 'c' to cancel.");
                        var key = Console.ReadKey().KeyChar;
                        if (key == 'c')
                        {
                            Console.WriteLine("Cancelling");
                            cts.Cancel();
                        }
                        Console.WriteLine("Wating...");
                        task.ContinueWith(t => { }).Wait();
                        Console.WriteLine("Status: {0}", task.Status);
                    }
                }
            }
        }
    }
}

    public static class CancellationTokenExtensions
    {
        public static async Task UntilCompletionOrCancellation(Task asyncOp, CancellationToken ct)
        {
            var tcs = new TaskCompletionSource<bool>();
            using (ct.Register(() => tcs.TrySetResult(true)))
            {
                await Task.WhenAny(asyncOp, tcs.Task);
            }
        }
    }

    public class CancellationTokenTest
    {
        public static void Run()
        {
            var cts = new CancellationTokenSource();
            Task.Run(async () => await test(), cts.Token);
            Console.ReadLine();
            cts.Cancel();
            Console.WriteLine("Cancel...");
            Console.ReadLine();
        }

        private static async Task test()
        {
            while (true)
            {
                await Task.Delay(1000);
                Console.WriteLine("Test...");
            }
        }
    }

Test...
Test...
Test...
 
Cancel...
Test...
Test...
Test...
Test...

public class CancellationTokenTest
    {
        public static void Run()
        {
            var cts = new CancellationTokenSource();
            Task.Run(async () => await test(cts.Token), cts.Token);
            Console.ReadLine();
            cts.Cancel();
            Console.WriteLine("Cancel...");
            Console.ReadLine();
        }

        private static async Task test(CancellationToken ct)
        {
            while (true)
            {
                await Task.Delay(1000, ct);
                Console.WriteLine("Test...");

                if (ct.IsCancellationRequested)
                {
                    break;
                }
            }
            Console.WriteLine("Test cancelled");
        }
    }

        private static async Task test2(CancellationToken ct)
        {
            bool isRunning = true;

            ct.Register(() =>
            {
                isRunning = false;
                Console.WriteLine("Query cancelled");
            });

            while (isRunning)
            {
                await Task.Delay(1000, ct);
                Console.WriteLine("Test...");
            }
            Console.WriteLine("Test cancelled");
        }

https://idpHostAddress/connect/authorize? 
client_id=imagegalleryclient 
&redirect_uri=https://clientapphostaddress/signin-oidcoidc 
&scope=openid profile 
&response_type=code id_token 
&response_mode=form_post
&nonce=63626...n2eNMxA0

namespace DNT.IDP
{
    public static class Config
    {
        public static IEnumerable<Client> GetClients()
        {
            return new List<Client>
            {
                new Client
                {
                    ClientName = "Image Gallery",
                    ClientId = "imagegalleryclient",
                    AllowedGrantTypes = GrantTypes.Hybrid,
                    RedirectUris = new List<string>
                    {
                        "https://localhost:5001/signin-oidc"
                    },
                    PostLogoutRedirectUris = new List<string>
                    {
                        "https://localhost:5001/signout-callback-oidc"
                    },
                    AllowedScopes =
                    {
                        IdentityServerConstants.StandardScopes.OpenId,
                        IdentityServerConstants.StandardScopes.Profile
                    },
                    ClientSecrets =
                    {
                        new Secret("secret".Sha256())
                    }
                }
             };
        }
    }
}

namespace ImageGallery.MvcClient.WebApp
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddAuthentication(options =>
            {
                options.DefaultScheme = "Cookies";
                options.DefaultChallengeScheme = "oidc";
            }).AddCookie("Cookies")
              .AddOpenIdConnect("oidc", options =>
              {
                  options.SignInScheme = "Cookies";
                  options.Authority = "https://localhost:6001";
                  options.ClientId = "imagegalleryclient";
                  options.ResponseType = "code id_token";
                  //options.CallbackPath = new PathString("...")
                  //options.SignedOutCallbackPath = new PathString("...")
                  options.Scope.Add("openid");
                  options.Scope.Add("profile");
                  options.SaveTokens = true;
                  options.ClientSecret = "secret";
                  options.GetClaimsFromUserInfoEndpoint = true;
              });

namespace ImageGallery.MvcClient.WebApp
{
    public class Startup
    {
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            app.UseAuthentication();

namespace ImageGallery.MvcClient.WebApp.Controllers
{
    [Authorize]
    public class GalleryController : Controller
    {
    // .... 
   
        public async Task WriteOutIdentityInformation()
        {
            var identityToken = await HttpContext.GetTokenAsync(OpenIdConnectParameterNames.IdToken);
            Debug.WriteLine($"Identity token: {identityToken}");

            foreach (var claim in User.Claims)
            {
                Debug.WriteLine($"Claim type: {claim.Type} - Claim value: {claim.Value}");
            }
        }

        public async Task<IActionResult> Index()
        {
            await WriteOutIdentityInformation();
            // ....

<div class="navbar-collapse collapse">
    <ul class="nav navbar-nav">
        <li><a asp-area="" asp-controller="Gallery" asp-action="Index">Home</a></li>
        <li><a asp-area="" asp-controller="Gallery" asp-action="AddImage">Add an image</a></li>
        @if (User.Identity.IsAuthenticated)
        {
            <li><a asp-area="" asp-controller="Gallery" asp-action="Logout">Logout</a></li>
        }
    </ul>
</div>

namespace ImageGallery.MvcClient.WebApp.Controllers
{
    [Authorize]
    public class GalleryController : Controller
    {
        public async Task Logout()
        {
            // Clears the  local cookie ("Cookies" must match the name of the scheme)
            await HttpContext.SignOutAsync("Cookies");
            await HttpContext.SignOutAsync("oidc");
        }

PostLogoutRedirectUris = new List<string>
{
     "https://localhost:5001/signout-callback-oidc"
},

options.Scope.Add("openid");
options.Scope.Add("profile");

options.GetClaimsFromUserInfoEndpoint = true;

<CustomControls:FrameFactory
                    x:Name="ActiveScreen"            
                    HorizontalContentAlignment="Stretch"
                    VerticalContentAlignment="Stretch"     
                    NavigationUIVisibility="Hidden"            
                    Grid.Column="1" 
                    Margin="0" />

/// <summary>
/// تغییر مشخصات کاربر جاری
/// </summary>
[PageAuthorization(AuthorizationType.FreeForAuthenticatedUsers)]
public partial class ChangeProfile

                <Button Style="{DynamicResource MetroCircleButtonStyle}"
                        Height="55" Width="55"  
                        Command="{Binding DoNavigate}"
                        CommandParameter="\Views\UserInfo\ChangeProfile.xaml"
                        Margin="2">
                    <Rectangle Width="28" Height="17.25">
                        <Rectangle.Fill>
                            <VisualBrush Stretch="Fill" Visual="{StaticResource appbar_user_tie}" />
                        </Rectangle.Fill>
                    </Rectangle>
                </Button>

 public abstract class BaseViewModel : DataErrorInfoBase, INotifyPropertyChanged, IViewModel

public class EntityAudit<TEntity>
{
    [JsonProperty("type")]
    [JsonConverter(typeof(StringEnumConverter))]
    public EntityEventType EventType { get; set; }

    [JsonProperty("user", NullValueHandling = NullValueHandling.Include)]
    public int? ActorUserId { get; set; }

    [JsonProperty("at")]
    public DateTime ActDateTime { get; set; }

    [JsonProperty("sources")]
    public AuditSourceValues? AuditSourceValues { get; set; }

    [JsonProperty("newValues", NullValueHandling = NullValueHandling.Include)]
    public TEntity NewEntity { get; set; } = default!;

    public string? SerializeJson()
    {
        return JsonSerializer.Serialize(this, 
            options: new JsonSerializerOptions { WriteIndented = false, IgnoreNullValues = true }); 
    }
}

دقت کنید که این کلاس به صورت جنریک تعریف شده است تا اگر بعدا بخواهیم آن را Deserialize کنیم و مثلا از آن API بسازیم، یا استفاده‌ی خاصی را از آن داشته باشیم، به‌راحتی به Entity مد نظر تبدیل شود. در این مقاله فقط به ذخیره‌ی آن پرداخته می‌شود و استفاده از این فیلد که به راحتی و با کمک DbFunctionها در Entity Framework قابل انجام است به خواننده واگذار می‌شود. 

و سپس آن را به سیستم معرفی می‌کنیم:

services.AddDbContext<ATADbContext>((serviceProvider, options) =>
{
    options
        .UseSqlServer(...)

    // Interceptors
    var entityAuditProvider = serviceProvider.GetRequiredService<IEntityAuditProvider>();
    options.AddInterceptors(new AuditSaveChangesInterceptor(entityAuditProvider));

});

ولی روش گفته شده در این مقاله، همین عملیات را به صورت کاملتری و فقط بر روی یک ستون همان جدول انجام می‌دهد که باعث ذخیره‌ی دیتای کمتر، یکپارچگی بهتر و دسترسی‌پذیری و راحتی استفاده از آن می‌شود.