The new version 2.3.1 of the Roslynator.Analyzers package brings the number of analyzers, refactorings and fixes to over 500. 

This book is a collection of problems on the knowledge of the .NET platform and the C# programming language 

 import {Observable} from 'rxjs';

 import Rx from "rxjs/Rx";

 Rx.Observable.of(1, 2, 3).map(i => i.toString());

import { Observable } from "rxjs/Observable";
import "rxjs/add/observable/of";
import "rxjs/add/operator/map";

 Observable.of(1, 2, 3).map(i => i.toString());

import { Observable } from "rxjs/Observable";
import { of } from "rxjs/observable/of";
import { map } from "rxjs/operator/map";

 const source = of(1, 2, 3);
const mapped = map.call(source, i => i.toString());

 npm install rxjs-tslint-rules --save-dev

{
  "rulesDirectory": [
    "node_modules/codelyzer"
  ],
  "extends": [
    "rxjs-tslint-rules"
  ],  
  "rules": {
    "rxjs-add": { "severity": "error" },
    "rxjs-no-patched": { "severity": "error" },
    "rxjs-no-unused-add": { "severity": "error" },
    "rxjs-no-wholesale": { "severity": "error" },
    "rxjs-no-subject-unsubscribe": { "severity": "error" },

import 'rxjs/add/operator/map';
import 'rxjs/add/operator/do';
import 'rxjs/add/operator/catch';

// define the rxjs operators needed by your app
// see node_module/rxjs/Rx.js for more

// statics
import "rxjs/add/observable/from";
import "rxjs/add/observable/throw";

// operators
import "rxjs/add/operator/catch";
import "rxjs/add/operator/combineLatest";
import "rxjs/add/operator/debounceTime";
import "rxjs/add/operator/delay";
import "rxjs/add/operator/distinctUntilChanged";
import "rxjs/add/operator/do";
import "rxjs/add/operator/filter";
import "rxjs/add/operator/finally";
import "rxjs/add/operator/first";
import "rxjs/add/operator/ignoreElements";
import "rxjs/add/operator/let";
import "rxjs/add/operator/map";
import "rxjs/add/operator/mapTo";
import "rxjs/add/operator/mergeMap";
import "rxjs/add/operator/startWith";
import "rxjs/add/operator/switchMap";
import "rxjs/add/operator/takeUntil";
import "rxjs/add/operator/withLatestFrom";
import "rxjs/add/operator/takeUntil";
import "rxjs/add/operator/take";

 // import RxJs needed operators only once
import "./shared/rxjs-operators";

//...
@NgModule({
//...

 import { Observable } from "rxjs/Observable";

Changes since Git for Windows v2.36.1 (May 9th 2022)

New Features

• Comes with Git v2.37.0.
• Many anti-malware products seem to have problems with our MSYS2 runtime, leading to problems running e.g. git subtree. We added a workaround that hopefully helps in most of these scenarios.
• Comes with MSYS2 runtime (Git for Windows flavor) based on Cygwin 3.3.5.
• Comes with PCRE2 v10.40.
• Comes with Git LFS v3.2.0.
• Comes with GNU TLS v3.7.6.
• SSH's CBC ciphers, which were re-enabled in 2017 to better support Azure Repos have again been disabled by default because Azure Repos does not require them any longer.
• Comes with OpenSSL v1.1.1p.
• Comes with Git Credential Manager Core v2.0.779.
• Comes with cURL v7.84.0. 

Security Advisory Notices

CVE-2019-1077 Visual Studio Extension Auto Update Vulnerability

An elevation of privilege vulnerability exists when the Visual Studio Extension auto-update process improperly performs certain file operations. An attacker who successfully exploited this vulnerability could delete files in arbitrary locations. To exploit this vulnerability, an attacker would require unprivileged access to a vulnerable system. The security update addresses the vulnerability by securing locations the Visual Studio Extension auto-update performs file operations in.

CVE-2019-1075 ASP.NET Core Spoofing Vulnerability

A spoofing vulnerability exists in ASP.NET Core that could lead to an open redirect. An attacker who successfully exploited the vulnerability could redirect a targeted user to a malicious website. To exploit the vulnerability, an attacker could send a link that has a specially crafted URL and convince the user to click the link.

The security update addresses the vulnerability by correcting how ASP.NET Core parses URLs. Details can be found in the .NET Core release notes.

CVE-2019-1113 WorkflowDesigner XOML deserialization allows code execution

A XOML file referencing certain types could cause random code to be executed when the XOML file is opened in Visual Studio. There is now a restriction on what types are allowed to be used in XOML files. If a XOML file containing one of the newly unauthorized types is opened, a message is displayed explaining that the type is unauthorized.

For further information, please refer to https://support.microsoft.com/en-us/help/4512190/remote-code-execution-vulnerability-if-types-are-specified-in-xoml.

ToTable("Users");

Get-Project Iris.DomainClasses, Iris.Datalayer, Iris.Servicelayer, Iris.Web | Install-Package Microsoft.AspNet.Identity.EntityFramework

        public IrisDbContext()
            : base("IrisDbContext")
        {
        }

            modelBuilder.Entity<CustomRole>().ToTable("AspRoles");
            modelBuilder.Entity<CustomUserClaim>().ToTable("UserClaims");
            modelBuilder.Entity<CustomUserRole>().ToTable("UserRoles");
            modelBuilder.Entity<CustomUserLogin>().ToTable("UserLogins");

AddColumn("dbo.Users", "EmailConfirmed", c => c.Boolean(nullable: false, defaultValue:true));

Get-Project Iris.Servicelayer, Iris.Web | Install-Package Microsoft.AspNet.Identity.Owin

                x.For<IIdentity>().Use(() => (HttpContext.Current != null && HttpContext.Current.User != null) ? HttpContext.Current.User.Identity : null);

                x.For<IUnitOfWork>()
                    .HybridHttpOrThreadLocalScoped()
                    .Use<IrisDbContext>();

                x.For<IrisDbContext>().HybridHttpOrThreadLocalScoped()
                   .Use(context => (IrisDbContext)context.GetInstance<IUnitOfWork>());
                x.For<DbContext>().HybridHttpOrThreadLocalScoped()
                   .Use(context => (IrisDbContext)context.GetInstance<IUnitOfWork>());

                x.For<IUserStore<ApplicationUser, int>>()
                    .HybridHttpOrThreadLocalScoped()
                    .Use<CustomUserStore>();

                x.For<IRoleStore<CustomRole, int>>()
                    .HybridHttpOrThreadLocalScoped()
                    .Use<RoleStore<CustomRole, int, CustomUserRole>>();

                x.For<IAuthenticationManager>()
                      .Use(() => HttpContext.Current.GetOwinContext().Authentication);

                x.For<IApplicationSignInManager>()
                      .HybridHttpOrThreadLocalScoped()
                      .Use<ApplicationSignInManager>();

                x.For<IApplicationRoleManager>()
                      .HybridHttpOrThreadLocalScoped()
                      .Use<ApplicationRoleManager>();

                // map same interface to different concrete classes
                x.For<IIdentityMessageService>().Use<SmsService>();
                x.For<IIdentityMessageService>().Use<IdentityEmailService>();

                x.For<IApplicationUserManager>().HybridHttpOrThreadLocalScoped()
                   .Use<ApplicationUserManager>()
                   .Ctor<IIdentityMessageService>("smsService").Is<SmsService>()
                   .Ctor<IIdentityMessageService>("emailService").Is<IdentityEmailService>()
                   .Setter<IIdentityMessageService>(userManager => userManager.SmsService).Is<SmsService>()
                   .Setter<IIdentityMessageService>(userManager => userManager.EmailService).Is<IdentityEmailService>();

                x.For<ApplicationUserManager>().HybridHttpOrThreadLocalScoped()
                   .Use(context => (ApplicationUserManager)context.GetInstance<IApplicationUserManager>());

                x.For<ICustomRoleStore>()
                      .HybridHttpOrThreadLocalScoped()
                      .Use<CustomRoleStore>();

                x.For<ICustomUserStore>()
                      .HybridHttpOrThreadLocalScoped()
                      .Use<CustomUserStore>();

Install-Package Microsoft.Owin.Host.SystemWeb

    public class User
    {
        public User()
        {
            UserRoles = new HashSet<UserRole>();
        }

        public int Id { get; set; }

        public string Username { get; set; }

        public string Password { get; set; }

        public string DisplayName { get; set; }

        public bool IsActive { get; set; }

        public DateTimeOffset? LastLoggedIn { get; set; }

        /// <summary>
        /// every time the user changes his Password,
        /// or an admin changes his Roles or stat/IsActive,
        /// create a new `SerialNumber` GUID and store it in the DB.
        /// </summary>
        public string SerialNumber { get; set; }

        public virtual ICollection<UserRole> UserRoles { get; set; }
    }

    public class Role
    {
        public Role()
        {
            UserRoles = new HashSet<UserRole>();
        }

        public int Id { get; set; }
        public string Name { get; set; }

        public virtual ICollection<UserRole> UserRoles { get; set; }
    }

    public static class CustomRoles
    {
        public const string Admin = nameof(Admin);
        public const string User = nameof(User);
    }

    public class UserRole
    {
        public int UserId { get; set; }
        public int RoleId { get; set; }

        public virtual User User { get; set; }
        public virtual Role Role { get; set; }
    }

    public interface IUnitOfWork : IDisposable
    {
        DbSet<TEntity> Set<TEntity>() where TEntity : class;

        int SaveChanges(bool acceptAllChangesOnSuccess);
        int SaveChanges();
        Task<int> SaveChangesAsync(bool acceptAllChangesOnSuccess, CancellationToken cancellationToken = new CancellationToken());
        Task<int> SaveChangesAsync(CancellationToken cancellationToken = new CancellationToken());
    }

    public class ApplicationDbContext : DbContext, IUnitOfWork
    {
        public ApplicationDbContext(DbContextOptions options) : base(options)
        { }

        public virtual DbSet<User> Users { set; get; }
        public virtual DbSet<Role> Roles { set; get; }
        public virtual DbSet<UserRole> UserRoles { get; set; }

        protected override void OnModelCreating(ModelBuilder builder)
        {
            // it should be placed here, otherwise it will rewrite the following settings!
            base.OnModelCreating(builder);

            // Custom application mappings
            builder.Entity<User>(entity =>
            {
                entity.Property(e => e.Username).HasMaxLength(450).IsRequired();
                entity.HasIndex(e => e.Username).IsUnique();
                entity.Property(e => e.Password).IsRequired();
                entity.Property(e => e.SerialNumber).HasMaxLength(450);
            });

            builder.Entity<Role>(entity =>
            {
                entity.Property(e => e.Name).HasMaxLength(450).IsRequired();
                entity.HasIndex(e => e.Name).IsUnique();
            });

            builder.Entity<UserRole>(entity =>
            {
                entity.HasKey(e => new { e.UserId, e.RoleId });
                entity.HasIndex(e => e.UserId);
                entity.HasIndex(e => e.RoleId);
                entity.Property(e => e.UserId);
                entity.Property(e => e.RoleId);
                entity.HasOne(d => d.Role).WithMany(p => p.UserRoles).HasForeignKey(d => d.RoleId);
                entity.HasOne(d => d.User).WithMany(p => p.UserRoles).HasForeignKey(d => d.UserId);
            });
        }
    }

    /// <summary>
    /// Only used by EF Tooling
    /// </summary>
    public class ApplicationDbContextFactory : IDesignTimeDbContextFactory<ApplicationDbContext>
    {
        public ApplicationDbContext CreateDbContext(string[] args)
        {
            var basePath = Directory.GetCurrentDirectory();
            Console.WriteLine($"Using `{basePath}` as the BasePath");
            var configuration = new ConfigurationBuilder()
                                    .SetBasePath(basePath)
                                    .AddJsonFile("appsettings.json")
                                    .Build();
            var builder = new DbContextOptionsBuilder<ApplicationDbContext>();
            var connectionString = configuration.GetConnectionString("DefaultConnection");
            builder.UseSqlServer(connectionString);
            return new ApplicationDbContext(builder.Options);
        }
    }

{
  "ConnectionStrings": {
    "DefaultConnection": "Data Source=(LocalDB)\\MSSQLLocalDB;Initial Catalog=ASPNETCore2CookieAuthenticationDB;Integrated Security=True;MultipleActiveResultSets=True;"
  },
  "LoginCookieExpirationDays": 30
}

    public interface IUsersService
    {
        Task<string> GetSerialNumberAsync(int userId);
        Task<User> FindUserAsync(string username, string password);
        Task<User> FindUserAsync(int userId);
        Task UpdateUserLastActivityDateAsync(int userId);
    }

    public interface IRolesService
    {
        Task<List<Role>> FindUserRolesAsync(int userId);
        Task<bool> IsUserInRole(int userId, string roleName);
        Task<List<User>> FindUsersInRoleAsync(string roleName);
    }

    public interface IDbInitializerService
    {
        void Initialize();
        void SeedData();
    }

    public interface ICookieValidatorService
    {
        Task ValidateAsync(CookieValidatePrincipalContext context);
    }

    public class CookieValidatorService : ICookieValidatorService
    {
        private readonly IUsersService _usersService;
        public CookieValidatorService(IUsersService usersService)
        {
            _usersService = usersService;
            _usersService.CheckArgumentIsNull(nameof(usersService));
        }

        public async Task ValidateAsync(CookieValidatePrincipalContext context)
        {
            var userPrincipal = context.Principal;

            var claimsIdentity = context.Principal.Identity as ClaimsIdentity;
            if (claimsIdentity?.Claims == null || !claimsIdentity.Claims.Any())
            {
                // this is not our issued cookie
                await handleUnauthorizedRequest(context);
                return;
            }

            var serialNumberClaim = claimsIdentity.FindFirst(ClaimTypes.SerialNumber);
            if (serialNumberClaim == null)
            {
                // this is not our issued cookie
                await handleUnauthorizedRequest(context);
                return;
            }

            var userIdString = claimsIdentity.FindFirst(ClaimTypes.UserData).Value;
            if (!int.TryParse(userIdString, out int userId))
            {
                // this is not our issued cookie
                await handleUnauthorizedRequest(context);
                return;
            }

            var user = await _usersService.FindUserAsync(userId).ConfigureAwait(false);
            if (user == null || user.SerialNumber != serialNumberClaim.Value || !user.IsActive)
            {
                // user has changed his/her password/roles/stat/IsActive
                await handleUnauthorizedRequest(context);
            }

            await _usersService.UpdateUserLastActivityDateAsync(userId).ConfigureAwait(false);
        }

        private Task handleUnauthorizedRequest(CookieValidatePrincipalContext context)
        {
            context.RejectPrincipal();
            return context.HttpContext.SignOutAsync(CookieAuthenticationDefaults.AuthenticationScheme);
        }
    }

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddScoped<IUnitOfWork, ApplicationDbContext>();
            services.AddScoped<IUsersService, UsersService>();
            services.AddScoped<IRolesService, RolesService>();
            services.AddScoped<ISecurityService, SecurityService>();
            services.AddScoped<ICookieValidatorService, CookieValidatorService>();
            services.AddScoped<IDbInitializerService, DbInitializerService>();

            services.AddDbContext<ApplicationDbContext>(options =>
            {
                options.UseSqlServer(
                    Configuration.GetConnectionString("DefaultConnection"),
                    serverDbContextOptionsBuilder =>
                        {
                            var minutes = (int)TimeSpan.FromMinutes(3).TotalSeconds;
                            serverDbContextOptionsBuilder.CommandTimeout(minutes);
                            serverDbContextOptionsBuilder.EnableRetryOnFailure();
                        });
            });

            // Only needed for custom roles.
            services.AddAuthorization(options =>
                    {
                        options.AddPolicy(CustomRoles.Admin, policy => policy.RequireRole(CustomRoles.Admin));
                        options.AddPolicy(CustomRoles.User, policy => policy.RequireRole(CustomRoles.User));
                    });

            // Needed for cookie auth.
            services
                .AddAuthentication(options =>
                {
                    options.DefaultChallengeScheme = CookieAuthenticationDefaults.AuthenticationScheme;
                    options.DefaultSignInScheme = CookieAuthenticationDefaults.AuthenticationScheme;
                    options.DefaultAuthenticateScheme = CookieAuthenticationDefaults.AuthenticationScheme;
                })
                .AddCookie(options =>
                {
                    options.SlidingExpiration = false;
                    options.LoginPath = "/api/account/login";
                    options.LogoutPath = "/api/account/logout";
                    //options.AccessDeniedPath = new PathString("/Home/Forbidden/");
                    options.Cookie.Name = ".my.app1.cookie";
                    options.Cookie.HttpOnly = true;
                    options.Cookie.SecurePolicy = CookieSecurePolicy.SameAsRequest;
                    options.Cookie.SameSite = SameSiteMode.Lax;
                    options.Events = new CookieAuthenticationEvents
                    {
                        OnValidatePrincipal = context =>
                        {
                            var cookieValidatorService = context.HttpContext.RequestServices.GetRequiredService<ICookieValidatorService>();
                            return cookieValidatorService.ValidateAsync(context);
                        }
                    };
                });

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
   app.UseAuthentication();

            var scopeFactory = app.ApplicationServices.GetRequiredService<IServiceScopeFactory>();
            using (var scope = scopeFactory.CreateScope())
            {
                var dbInitializer = scope.ServiceProvider.GetService<IDbInitializerService>();
                dbInitializer.Initialize();
                dbInitializer.SeedData();
            }

        [AllowAnonymous]
        [HttpPost("[action]")]
        public async Task<IActionResult> Login([FromBody]  User loginUser)
        {
            if (loginUser == null)
            {
                return BadRequest("user is not set.");
            }

            var user = await _usersService.FindUserAsync(loginUser.Username, loginUser.Password).ConfigureAwait(false);
            if (user == null || !user.IsActive)
            {
                await HttpContext.SignOutAsync(CookieAuthenticationDefaults.AuthenticationScheme);
                return Unauthorized();
            }

            var loginCookieExpirationDays = _configuration.GetValue<int>("LoginCookieExpirationDays", defaultValue: 30);
            var cookieClaims = await createCookieClaimsAsync(user).ConfigureAwait(false);
            await HttpContext.SignInAsync(
                CookieAuthenticationDefaults.AuthenticationScheme,
                cookieClaims,
                new AuthenticationProperties
                {
                    IsPersistent = true, // "Remember Me"
                    IssuedUtc = DateTimeOffset.UtcNow,
                    ExpiresUtc = DateTimeOffset.UtcNow.AddDays(loginCookieExpirationDays)
                });

            await _usersService.UpdateUserLastActivityDateAsync(user.Id).ConfigureAwait(false);

            return Ok();
        }

        private async Task<ClaimsPrincipal> createCookieClaimsAsync(User user)
        {
            var identity = new ClaimsIdentity(CookieAuthenticationDefaults.AuthenticationScheme);
            identity.AddClaim(new Claim(ClaimTypes.NameIdentifier, user.Id.ToString()));
            identity.AddClaim(new Claim(ClaimTypes.Name, user.Username));
            identity.AddClaim(new Claim("DisplayName", user.DisplayName));

            // to invalidate the cookie
            identity.AddClaim(new Claim(ClaimTypes.SerialNumber, user.SerialNumber));

            // custom data
            identity.AddClaim(new Claim(ClaimTypes.UserData, user.Id.ToString()));

            // add roles
            var roles = await _rolesService.FindUserRolesAsync(user.Id).ConfigureAwait(false);
            foreach (var role in roles)
            {
                identity.AddClaim(new Claim(ClaimTypes.Role, role.Name));
            }

            return new ClaimsPrincipal(identity);
        }

[Route("api/[controller]")]
[Authorize(Policy = CustomRoles.Admin)]
public class MyProtectedAdminApiController : Controller

        [AllowAnonymous]
        [HttpGet("[action]"), HttpPost("[action]")]
        public async Task<bool> Logout()
        {
            await HttpContext.SignOutAsync(CookieAuthenticationDefaults.AuthenticationScheme);
            return true;
        }

A function for loading CSS asynchronously

Why loadCSS?

Referencing CSS stylesheets with link[rel=stylesheet] or @import causes browsers to delay page rendering while a stylesheet loads. When loading stylesheets that are not critical to the initial rendering of a page, this blocking behavior is undesirable. The new <link rel="preload"> standard enables us to load stylesheets asynchronously, without blocking rendering, and loadCSS provides a JavaScript polyfill for that feature to allow it to work across browsers. Additionally, loadCSS offers a separate (and optional) JavaScript function for loading stylesheets dynamically.

npm install fg-loadcss --save