In this webinar, we will show the benefits of using DevExpress Object-Relational Mapping Library - the eXpress Persistent Objects - with .NET Core 2. The presentation will quickly cover the basics for those new to DevExpress products, and will show how you can use our ORM to manage data in ASP.NET Core or Xamarin apps. 

Spark is an open source computing framework for Big Data, and it’s becoming increasingly popular, especially in machine learning scenarios. In this article I’ll describe how to install Spark on a machine running a Windows OS, and explain basic Spark functionality from a .NET developer’s point of view. 

Analyzing Solorigate, the compromised DLL file that started a sophisticated cyberattack, and how Microsoft Defender helps protect customers  

using System;
using System.ComponentModel.DataAnnotations;

namespace AngularTemplateDrivenFormsLab.Models
{
    public class Movie
    {
        public int Id { get; set; }

        [Required(ErrorMessage = "Movie Title is Required")]
        [MinLength(3, ErrorMessage = "Movie Title must be at least 3 characters")]
        public string Title { get; set; }

        [Required(ErrorMessage = "Movie Director is Required.")]
        public string Director { get; set; }

        [Range(0, 100, ErrorMessage = "Ticket price must be between 0 and 100.")]
        public decimal TicketPrice { get; set; }

        [Required(ErrorMessage = "Movie Release Date is required")]
        public DateTime ReleaseDate { get; set; }
    }
}

using AngularTemplateDrivenFormsLab.Models;
using Microsoft.AspNetCore.Mvc;

namespace AngularTemplateDrivenFormsLab.Controllers
{
    [Route("api/[controller]")]
    public class MoviesController : Controller
    {
        [HttpPost]
        public IActionResult Post([FromBody]Movie movie)
        {
            if (ModelState.IsValid)
            {
                // TODO: save ...
                return Ok(movie);
            }

            ModelState.AddModelError("", "This record already exists."); // a cross field validation
            return BadRequest(ModelState);
        }
    }
}

 {"":["This record already exists."],"TicketPrice":["Ticket price must be between 0 and 100."]}

  errors: string[] = [];

  processModelStateErrors(form: NgForm, responseError: HttpErrorResponse) {
    if (responseError.status === 400) {
      const modelStateErrors = responseError.error;
      for (const fieldName in modelStateErrors) {
        if (modelStateErrors.hasOwnProperty(fieldName)) {
          const modelStateError = modelStateErrors[fieldName];
          const control = form.controls[fieldName] || form.controls[this.lowerCaseFirstLetter(fieldName)];
          if (control) {
            // integrate into Angular's validation
            control.setErrors({
              modelStateError: { error: modelStateError }
            });
          } else {
            // for cross field validations -> show the validation error at the top of the screen
            this.errors.push(modelStateError);
          }
        }
      }
    } else {
      this.errors.push("something went wrong!");
    }
  }

  lowerCaseFirstLetter(data: string): string {
    return data.charAt(0).toLowerCase() + data.slice(1);
  }

 const control = form.controls[fieldName] || form.controls[this.lowerCaseFirstLetter(fieldName)];

  model = new Movie("", "", 0, "");
  successfulSave: boolean;
  errors: string[] = [];

  constructor(private movieService: MovieService) { }

  ngOnInit() {
  }

  submitForm(form: NgForm) {
    console.log(form);

    this.errors = [];
    this.movieService.postMovieForm(this.model).subscribe(
      (data: Movie) => {
        console.log("Saved data", data);
        this.successfulSave = true;
      },
      (responseError: HttpErrorResponse) => {
        this.successfulSave = false;
        console.log("Response Error", responseError);
        this.processModelStateErrors(form, responseError);
      });
  }

<form #form="ngForm" (submit)="submitForm(form)" novalidate>
  <div class="alert alert-danger" role="alert" *ngIf="errors.length > 0">
    <ul>
      <li *ngFor="let error of errors">
        {{ error }}
      </li>
    </ul>
  </div>
  <div class="alert alert-success" role="alert" *ngIf="successfulSave">
    Movie saved successfully!
  </div>

control.setErrors({
  modelStateError: { error: modelStateError }
});

<ng-template #validationErrorsTemplate let-ctrl="control">
  <div *ngIf="ctrl.invalid && ctrl.touched">
    <div class="alert alert-danger"  *ngIf="ctrl.errors.required">
      This field is required.
    </div>
    <div class="alert alert-danger"  *ngIf="ctrl.errors.minlength">
      This field should be minimum {{ctrl.errors.minlength.requiredLength}} characters.
    </div>
    <div class="alert alert-danger"  *ngIf="ctrl.errors.maxlength">
      This field should be max {{ctrl.errors.maxlength.requiredLength}} characters.
    </div>
    <div class="alert alert-danger"  *ngIf="ctrl.errors.pattern">
      This field's pattern: {{ctrl.errors.pattern.requiredPattern}}
    </div>
    <div class="alert alert-danger"  *ngIf="ctrl.errors.modelStateError">
      {{ctrl.errors.modelStateError.error}}
    </div>
  </div>
</ng-template>

  <div class="form-group" [class.has-error]="releaseDate.invalid && releaseDate.touched">
    <label class="control-label" for="releaseDate">Release Date</label>
    <input type="text" name="releaseDate" #releaseDate="ngModel"  class="form-control"
      required [(ngModel)]="model.releaseDate" />
    <ng-container *ngTemplateOutlet="validationErrorsTemplate; context:{ control: releaseDate }"></ng-container>
  </div>

• تنها کاربران احراز هویت شده قادر خواهند بود تا لیست ToDo‌های خود را ببینند، آیتم‌های جدید ثبت کنند یا داده‌های قبلی را ویرایش و حذف کنند.
• کاربران نباید آیتم‌های ایجاد شده توسط دیگر کاربران را ببینند.
• تنها کاربرانی که به نقش Admin تعلق دارند باید بتوانند تمام ToDo‌های ایجاد شده را ببینند.

Database.SetInitializer<MyDbContext>(new MyDbInitializer());

ایجاد نقش مدیر و کاربر جدیدی که به این نقش تعلق دارد

ساخت یک ToDo بعنوان کاربر عادی

پس از ساختن یک ToDo می‌توانید لیست رکوردهای خود را مشاهده کنید. دقت داشته باشید که رکوردهایی که کاربران دیگر ثبت کرده اند برای شما نمایش داده نخواهند شد.

مشاهده تمام ToDo‌ها بعنوان مدیر سایت

Why We Should Stop Using JavaScript According to Douglas Crockford (Inventor of JSON)  

Claim type: sid - Claim value: f3940d6e58cbb576669ee49c90e22cb1
Claim type: http://schemas.xmlsoap.org/ws/2005/05/identity/claims/nameidentifier - Claim value: d860efca-22d9-47fd-8249-791ba61b07c7
Claim type: http://schemas.microsoft.com/identity/claims/identityprovider - Claim value: local
Claim type: http://schemas.microsoft.com/claims/authnmethodsreferences - Claim value: pwd
Claim type: given_name - Claim value: Vahid
Claim type: family_name - Claim value: N

namespace ImageGallery.MvcClient.WebApp
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
            JwtSecurityTokenHandler.DefaultInboundClaimTypeMap.Clear();
        }

• Claim type: sid - Claim value: 91f5a09da5cdbbe18762526da1b996fb
• Claim type: sub - Claim value: d860efca-22d9-47fd-8249-791ba61b07c7
• Claim type: idp - Claim value: local
• Claim type: given_name - Claim value: Vahid
• Claim type: family_name - Claim value: N

namespace ImageGallery.MvcClient.WebApp
{
        public void ConfigureServices(IServiceCollection services)
        {
// ...
              .AddOpenIdConnect("oidc", options =>
              {
  // ...
                  options.ClaimActions.Remove("amr");
                  options.ClaimActions.DeleteClaim("sid");
                  options.ClaimActions.DeleteClaim("idp");
              });
        }

• Claim type: sub - Claim value: d860efca-22d9-47fd-8249-791ba61b07c7
• Claim type: amr - Claim value: pwd
• Claim type: given_name - Claim value: Vahid
• Claim type: family_name - Claim value: N

namespace DNT.IDP
{
    public static class Config
    {
        // identity-related resources (scopes)
        public static IEnumerable<IdentityResource> GetIdentityResources()
        {
            return new List<IdentityResource>
            {
                new IdentityResources.OpenId(),
                new IdentityResources.Profile(),
                new IdentityResources.Address()
            };
        }

AllowedScopes =
{
    IdentityServerConstants.StandardScopes.OpenId,
    IdentityServerConstants.StandardScopes.Profile,
    IdentityServerConstants.StandardScopes.Address
},

namespace DNT.IDP
{
    public static class Config
    {
        public static List<TestUser> GetUsers()
        {
            return new List<TestUser>
            {
                new TestUser
                {
// ...
                    Claims = new List<Claim>
                    {
// ...
                        new Claim("address", "Main Road 1")
                    }
                },
                new TestUser
                {
// ...
                    Claims = new List<Claim>
                    {
// ...
                        new Claim("address", "Big Street 2")
                    }
                }
            };
        }

namespace ImageGallery.MvcClient.WebApp
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
// ...
              .AddOpenIdConnect("oidc", options =>
              {
   // ...
                  options.Scope.Add("address");
   // …
   options.ClaimActions.DeleteClaim("address");
              });
        }

GET idphostaddress/connect/userinfo
Authorization: Bearer R9aty5OPlk

dotnet add package IdentityModel

namespace ImageGallery.MvcClient.WebApp.Controllers
{
    [Authorize]
    public class GalleryController : Controller
    {
        public async Task<IActionResult> OrderFrame()
        {
            var discoveryClient = new DiscoveryClient(_configuration["IDPBaseAddress"]);
            var metaDataResponse = await discoveryClient.GetAsync();

            var userInfoClient = new UserInfoClient(metaDataResponse.UserInfoEndpoint);

            var accessToken = await HttpContext.GetTokenAsync(OpenIdConnectParameterNames.AccessToken);
            var response = await userInfoClient.GetAsync(accessToken);
            if (response.IsError)
            {
                throw new Exception("Problem accessing the UserInfo endpoint.", response.Exception);
            }

            var address = response.Claims.FirstOrDefault(c => c.Type == "address")?.Value;
            return View(new OrderFrameViewModel(address));
        }

namespace ImageGallery.MvcClient.ViewModels
{
    public class OrderFrameViewModel
    {
        public string Address { get; } = string.Empty;

        public OrderFrameViewModel(string address)
        {
            Address = address;
        }
    }
}

@model ImageGallery.MvcClient.ViewModels.OrderFrameViewModel
<div class="container">
    <div class="h3 bottomMarginDefault">Order a framed version of your favorite picture.</div>
    <div class="text bottomMarginSmall">We've got this address on record for you:</div>
    <div class="text text-info bottomMarginSmall">@Model.Address</div>
    <div class="text">If this isn't correct, please contact us.</div>
</div>

<li><a asp-area="" asp-controller="Gallery" asp-action="OrderFrame">Order a framed picture</a></li>

namespace DNT.IDP
{
    public static class Config
    {
        public static List<TestUser> GetUsers()
        {
            return new List<TestUser>
            {
                new TestUser
                {
//...
                    Claims = new List<Claim>
                    {
//...
                        new Claim("role", "PayingUser")
                    }
                },
                new TestUser
                {
//...
                    Claims = new List<Claim>
                    {
//...
                        new Claim("role", "FreeUser")
                    }
                }
            };
        }

namespace DNT.IDP
{
    public static class Config
    {
        public static IEnumerable<IdentityResource> GetIdentityResources()
        {
            return new List<IdentityResource>
            {
                // ...
                new IdentityResource(
                    name: "roles",
                    displayName: "Your role(s)",
                    claimTypes: new List<string>() { "role" })
            };
        }

namespace DNT.IDP
{
    public static class Config
    {
        public static IEnumerable<Client> GetClients()
        {
            return new List<Client>
            {
                new Client
                {
// ...
                    AllowedScopes =
                    {
// ...
                        "roles"
                    }
// ...
                }
             };
        }

options.Scope.Add("roles");

• Claim type: sub - Claim value: d860efca-22d9-47fd-8249-791ba61b07c7
• Claim type: amr - Claim value: pwd
• Claim type: given_name - Claim value: Vahid
• Claim type: family_name - Claim value: N

options.ClaimActions.MapUniqueJsonKey(claimType: "role", jsonKey: "role");

• Claim type: sub - Claim value: d860efca-22d9-47fd-8249-791ba61b07c7
• Claim type: amr - Claim value: pwd
• Claim type: given_name - Claim value: Vahid
• Claim type: family_name - Claim value: N
• Claim type: role - Claim value: PayingUser

@if(User.IsInRole("PayingUser"))
{
   <li><a asp-area="" asp-controller="Gallery" asp-action="OrderFrame">Order a framed picture</a></li>
}

options.TokenValidationParameters = new TokenValidationParameters
{
    NameClaimType = JwtClaimTypes.GivenName,
    RoleClaimType = JwtClaimTypes.Role,
};

namespace ImageGallery.MvcClient.WebApp.Controllers
{
    [Authorize]
    public class GalleryController : Controller
    {
        [Authorize(Roles = "PayingUser")]
        public async Task<IActionResult> OrderFrame()
        {

using Microsoft.AspNetCore.Mvc;

public class AuthorizationController : Controller
{
    public IActionResult AccessDenied()
    {
        return View();
    }
}

<div class="container">
    <div class="h3">Woops, looks like you're not authorized to view this page.</div>
    <div>Would you prefer to <a asp-controller="Gallery" asp-action="Logout">log in as someone else</a>?</div>
</div>

namespace ImageGallery.MvcClient.WebApp
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddAuthentication(options =>
            {
                // ...
            }).AddCookie("Cookies", options =>
              {
                  options.AccessDeniedPath = "/Authorization/AccessDenied";
              })
// ...

How Google handles JavaScript throughout the indexing process

A research to demystify Google's rendering through empirical evidence.