<AuthorizeView>
    <Authorized>
        <a href="Identity/Account/Logout">Logout</a>
    </Authorized>
    <NotAuthorized>
        <a href="Identity/Account/Register">Register</a>
        <a href="Identity/Account/Login">Login</a>
    </NotAuthorized>
</AuthorizeView>

InvalidOperationException: Authorization requires a cascading parameter of type Task<AuthenticationState>.
Consider using CascadingAuthenticationState to supply this.
Microsoft.AspNetCore.Components.Authorization.AuthorizeViewCore.OnParametersSetAsync()

<CascadingAuthenticationState>
    <Router AppAssembly="@typeof(Program).Assembly" PreferExactMatches="@true">
        <Found Context="routeData">
            <RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />
        </Found>
        <NotFound>
            <LayoutView Layout="@typeof(MainLayout)">
                <p>Sorry, there's nothing at this address.</p>
            </LayoutView>
        </NotFound>
    </Router>
</CascadingAuthenticationState>

@page
@using Microsoft.AspNetCore.Identity
@inject SignInManager<IdentityUser> SignInManager

@functions
{
    public async Task<IActionResult> OnGet()
    {
        if (SignInManager.IsSignedIn(User))
        {
            <p>You have successfully logged out of the application.</p>
            await SignInManager.SignOutAsync();
        }
        return Redirect("~/");
    }
}

<AuthorizeView>
    <Authorized>
        Hello, @context.User.Identity.Name
        <a href="Identity/Account/Logout">Logout</a>
    </Authorized>

@attribute [Authorize]

<CascadingAuthenticationState>
    <Router AppAssembly="@typeof(Program).Assembly" PreferExactMatches="@true">
        <Found Context="routeData">
            @*<RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />*@
            <AuthorizeRouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)">
                <NotAuthorized>
                    <p>Sorry, you do not have access to this page</p>
                </NotAuthorized>
            </AuthorizeRouteView>
        </Found>
        <NotFound>
            <LayoutView Layout="@typeof(MainLayout)">
                <p>Sorry, there's nothing at this address.</p>
            </LayoutView>
        </NotFound>
    </Router>
</CascadingAuthenticationState>

  public bool IsDeleted { get; set; }

public interface ISoftDelete
{
    bool IsDeleted { get; set; }
}

public class Post :ISoftDelete
{
}

where (IsDeleted=false && ...)

public static class EntityFrameworkExtentions
{
    public static ObservableCollection<TEntity> Alive<TEntity>(this DbSet<TEntity> set)
        where TEntity : class, ISoftDelete
    {
        var data = set.Where(e => e.IsDeleted == false);
        return new ObservableCollection<TEntity>(data);
    }
}

Install-Package EntityFramework.DynamicFilters

modelBuilder.Filter("IsDeleted", (ISoftDelete d) => d.IsDeleted, false);

The DELETE statement conflicted with the REFERENCE constraint ....

public bool CanDelete(user model)
{
return !model.posts.Any() &&  ! model.news.Any();
}

[AttributeUsage(AttributeTargets.Property)]
public class MustBeEmptyToDeleteAttribute : Attribute { }

public class User
{
    public int Id { get; set; }
    public bool IsDeleted { get; set; }

    [MustBeEmptyToDelete] public virtual ICollection<Post> Posts { get; set; }
    [MustBeEmptyToDelete] public virtual ICollection<File> Files { get; set; }
    // etc...
}

public static class EntityExtensions
{
    public static bool CanDelete(this object entity)
    {
        return entity.GetType().GetProperties()
            .Where(x => x.IsDefined(typeof(MustBeEmptyToDeleteAttribute)))
            .Select(x => x.GetValue(entity))
            .OfType<IEnumerable<object>>()
            .All(x => !x.Any());
    }

 public void MarkAsSoftDeleted<TEntity>(TEntity entity) where TEntity : ISoftDelete
        {
            Entry(entity).State = EntityState.Modified;
           // set IsDelete=true 
          // here you can set other logs like who deleted ,when ,...
      }

 public void MarkAsDeleted<TEntity>(TEntity entity) where TEntity : class
    {
            Entry(entity).State = EntityState.Deleted;
    }

        endpoints.MapGet("/api/authors", async (MinimalBlogDbContext ctx) =>
        {
            var authors = await ctx.Authors.ToListAsync();
            return authors;
        });

        endpoints.MapPost("/api/authors", async (MinimalBlogDbContext ctx, AuthorDto authorDto) =>
        {
            var author = new Author();
            author.FirstName = authorDto.FirstName;
            author.LastName = authorDto.LastName;
            author.Bio = authorDto.Bio;
            author.DateOfBirth = authorDto.DateOfBirth;

            ctx.Authors.Add(author);
            await ctx.SaveChangesAsync();

            return author;
        });

using MediatR;
using MinimalBlog.Domain.Model;

namespace MinimalBlog.Api.Features.Authors;

public class CreateAuthorCommand : IRequest<Author>
{
    public AuthorDto AuthorDto { get; set; } = default!;
}

public interface IRequest<out TResponse> : IBaseRequest

namespace MinimalBlog.Api.Features.Authors;

public class CreateAuthorCommandHandler : IRequestHandler<CreateAuthorCommand, Author>
{
    private readonly MinimalBlogDbContext _context;
    private readonly IMapper _mapper;

    public CreateAuthorCommandHandler(MinimalBlogDbContext context, IMapper mapper)
    {
        _context = context ?? throw new ArgumentNullException(nameof(context));
        _mapper = mapper ?? throw new ArgumentNullException(nameof(mapper));
    }

    public async Task<Author> Handle(CreateAuthorCommand request, CancellationToken cancellationToken)
    {
        if (request == null)
        {
            throw new ArgumentNullException(nameof(request));
        }

        var toAdd = _mapper.Map<Author>(request.AuthorDto);
        _context.Authors.Add(toAdd);
        await _context.SaveChangesAsync(cancellationToken);
        return toAdd;
    }
}

public interface IRequestHandler<in TRequest, TResponse> where TRequest : IRequest<TResponse>

endpoints.MapPost("/api/authors", async (IMediator mediator, AuthorDto authorDto) =>
{
     var command = new CreateAuthorCommand { AuthorDto = authorDto };
     var author = await mediator.Send(command);
     return author;
});

endpoints.MapGet("/api/authors", async (IMediator mediator, CancellationToken ct) =>
        {
            var request = new GetAllAuthorsQuery();
            var authors = await mediator.Send(request, ct);
            return authors;
        });

public class Handler : IRequestHandler<Command>

public interface IRequestHandler<in TRequest> : IRequestHandler<TRequest, Unit> where TRequest : IRequest<Unit>

public async Task<Unit> Handle(Command request, CancellationToken cancellationToken)
{
   // ...
   return Unit.Value;
}

public class Command : IRequest

using MediatR;
using MinimalBlog.Domain.Model;

namespace MinimalBlog.Api.Features.Authors;

public class GetAllAuthorsQuery : IRequest<List<Author>>
{
}

namespace MinimalBlog.Api.Features.Authors;

public class GetAllAuthorsHandler : IRequestHandler<GetAllAuthorsQuery, List<Author>>
{
    private readonly MinimalBlogDbContext _context;

    public GetAllAuthorsHandler(MinimalBlogDbContext context)
    {
        _context = context ?? throw new ArgumentNullException(nameof(context));
    }

    public Task<List<Author>> Handle(GetAllAuthorsQuery request, CancellationToken cancellationToken)
    {
        return _context.Authors.ToListAsync(cancellationToken);
    }
}

endpoints.MapGet("/api/authors", async (IMediator mediator) =>
{
   var request = new GetAllAuthorsQuery();
   var authors = await mediator.Send(request);
   return authors;
});

public static class CreateAuthor
{
    public class Command : IRequest<AuthorGetDto>
    {
        // ...
    }

    public class Handler : IRequestHandler<Command, AuthorGetDto>
    {
       // ...
    }
}

var command = new CreateAuthor.Command { AuthorDto = authorDto };
var author = await mediator.Send(command, ct);

public static class GetAllAuthors
{
    public class Query : IRequest<List<AuthorGetDto>>
    {
       //...
    }

    public class Handler : IRequestHandler<Query, List<AuthorGetDto>>
    {
       //...
    }
}

public class NumberedEntity : Entity, IMultiTenantEntity
{
    public string EntityName { get; set; }
    public long NextNumber { get; set; }
    
    public long TenantId { get; set; }
}

public class NumberedEntityConfiguration : IEntityTypeConfiguration<NumberedEntity>
{
    public void Configure(EntityTypeBuilder<NumberedEntity> builder)
    {
        builder.Property(a => a.EntityName).HasMaxLength(256).IsRequired().IsUnicode(false);
        builder.HasIndex(a => a.EntityName).HasName("UIX_NumberedEntity_EntityName").IsUnique();
        builder.ToTable(nameof(NumberedEntity));
    }
}

شاید به نظر، استفاده از این موجودیت ضروریتی نداشته باشد و خیلی راحت می‌توان آخرین شماره ثبت شده‌ی در جدول مورد نظر را واکشی، مقداری را به آن اضافه و به عنوان شماره منحصر به فرد رکورد جدید استفاده کرد؛ با این رویکرد حداقل دو مشکل زیر را خواهیم داشت:

• ایجاد Gap مابین شماره‌های تولید شده، که مدنظر ما نمی‌باشد. (با توجه به اینکه امکان ثبت دستی را هم داریم، ممکن است کاربر شماره‌ای را وارد کرده باشد که با آخرین شماره ثبت شده تعداد زیادی فاصله دارد که به خودی خود مشکل ساز نیست؛ ولی در زمان ثبت رکورد بعدی اگر به صورت خودکار ثبت شماره داشته باشد، قطعا آخرین شماره (بزرگترین) را که به صورت دستی وارد شده بود، از جدول دریافت خواهد کرد)

• مشکلات کارایی برای حل مسائل همزمانی

internal class NumberingPreInsertHook : PreInsertHook<INumberedEntity>
{
    private readonly IUnitOfWork _uow;
    private readonly IOptions<NumberingConfiguration> _configuration;

    public NumberingPreInsertHook(IUnitOfWork uow, IOptions<NumberingConfiguration> configuration)
    {
        _uow = uow ?? throw new ArgumentNullException(nameof(uow));
        _configuration = configuration ?? throw new ArgumentNullException(nameof(configuration));
    }

    protected override void Hook(INumberedEntity entity, HookEntityMetadata metadata)
    {
        if (!entity.Number.IsNullOrEmpty()) return;

        bool retry;
        string nextNumber;
        
        do
        {
            nextNumber = GenerateNumber(entity);
            var exists = CheckDuplicateNumber(entity, nextNumber);
            retry = exists;
            
        } while (retry);
        
        entity.Number = nextNumber;
    }

    private bool CheckDuplicateNumber(INumberedEntity entity, string nextNumber)
    {
       //...
    }

    private string GenerateNumber(INumberedEntity entity)
    {
       //...
    }
}

ابتدا بررسی می‌شود اگر پراپرتی Number مقداردهی شده‌است، عملیات مقداردهی خودکار برروی آن انجام نگیرد. سپس با توجه به اینکه ممکن است به صورت دستی قبلا شماره‌ای مانند Task_1000 وارد شده باشد و NextNumber مرتبط هم مقدار 1000 را داشته باشد؛ در این صورت به هنگام ثبت رکورد بعدی، با توجه به Prefix تنظیم شده، دوباره به شماره Task_1000 خواهیم رسید که در این مورد خاص با استفاده از متد CheckDuplicateNumber این قضیه تشخیص داده شده و سعی مجددی برای تولید شماره جدید صورت می‌گیرد.

private string GenerateNumber(INumberedEntity entity)
{
    var option = _configuration.Value.NumberedEntityOptions[entity.GetType()];

    var entityName = $"{entity.GetType().FullName}";

    var lockKey = $"Tenant_{_uow.TenantId}_" + entityName;

    _uow.ObtainApplicationLevelDatabaseLock(lockKey);

    var nextNumber = option.Start.ToString();

    var numberedEntity = _uow.Set<NumberedEntity>().AsNoTracking().FirstOrDefault(a => a.EntityName == entityName);
    if (numberedEntity == null)
    {
        _uow.ExecuteSqlCommand(
            "INSERT INTO [dbo].[NumberedEntity]([EntityName], [NextNumber], [TenantId]) VALUES(@p0,@p1,@p2)", entityName,
            option.Start + option.IncrementBy, _uow.TenantId);
    }
    else
    {
        nextNumber = numberedEntity.NextNumber.ToString();
        _uow.ExecuteSqlCommand("UPDATE [dbo].[NumberedEntity] SET [NextNumber] = @p0 WHERE [Id] = @p1 ",
            numberedEntity.NextNumber + option.IncrementBy, numberedEntity.Id);
    }

    if (!string.IsNullOrEmpty(option.Prefix))
        nextNumber = option.Prefix + nextNumber;
    
    return nextNumber;
}

public static void ObtainApplicationLevelDatabaseLock(this IUnitOfWork uow, string resource)
{
    uow.ExecuteSqlCommand(@"EXEC sp_getapplock @Resource={0}, @LockOwner={1}, 
                @LockMode={2} , @LockTimeout={3};", resource, "Transaction", "Exclusive", 15000);
}

public class NumberingConfiguration
{
    public bool Enabled { get; set; }

    public IDictionary<Type, NumberedEntityOption> NumberedEntityOptions { get; } =
        new Dictionary<Type, NumberedEntityOption>();
}

public class NumberedEntityOption
{
    public string Prefix { get; set; }
    public int Start { get; set; } = 1;
    public int IncrementBy { get; set; } = 1;
}

public static void AddNumbering(this IServiceCollection services,
    IDictionary<Type, NumberedEntityOption> options)
{
    services.Configure<NumberingConfiguration>(configuration =>
    {
        configuration.Enabled = true;
        configuration.NumberedEntityOptions.AddRange(options);
    });
    
    services.AddTransient<IPreActionHook, NumberingPreInsertHook>();
}

services.AddNumbering(new Dictionary<Type, NumberedEntityOption>
{
    [typeof(Task)] = new NumberedEntityOption
    {
        Prefix = "T_",
        Start = 1000,
        IncrementBy = 5
    }
});

public class Task : TrackableEntity, IAggregateRoot, INumberedEntity
{
    public const int MaxTitleLength = 256;
    public const int MaxDescriptionLength = 1024; 

    public string Title { get; set; }
    public string NormalizedTitle { get; set; }
    public string Description { get; set; }
    public TaskState State { get; set; } = TaskState.Todo; 
    public byte[] RowVersion { get; set; }
    public string Number { get; set; }
}