using System;
using System.Reflection;
using PostSharp.Aspects;

namespace AOP03
{
    public class ApplicationExceptionHandlerAspect : OnExceptionAspect
    {
        public override void OnException(MethodExecutionArgs args)
        {
            Console.WriteLine("Exception Type: {0}, StackTrace: {1}",
                               args.Exception.GetType().Name,
                               args.Exception.StackTrace);
        }

        public override Type GetExceptionType(MethodBase targetMethod)
        {
            return typeof(ApplicationException);
        }
    }
}

using System;
using PostSharp.Aspects;

namespace AOP03
{
    public class ObjectInitializationAspect : LocationInterceptionAspect
    {
        public override void OnGetValue(LocationInterceptionArgs args)
        {
            if (args.GetCurrentValue() == null)
            {
                Console.WriteLine("Property {0} is null.", args.LocationFullName);
            }
        }
    }
}

using PostSharp.Aspects;
using System;

namespace AOP03
{
    public class LogEventAspect : EventInterceptionAspect
    {
        public override void OnAddHandler(EventInterceptionArgs args)
        {
            Console.WriteLine("Event {0} added", args.Event.Name);
            args.ProceedAddHandler();
        }

        public override void OnRemoveHandler(EventInterceptionArgs args)
        {
            Console.WriteLine("Event {0} removed", args.Event.Name);
            args.ProceedRemoveHandler();
        }

        public override void OnInvokeHandler(EventInterceptionArgs args)
        {
            Console.WriteLine("Event {0} invoked", args.Event.Name);
            args.ProceedInvokeHandler();
        }
    }
}

    public class LoggingAspect : OnMethodBoundaryAspect
    {
        public override bool CompileTimeValidate(System.Reflection.MethodBase method)
        {
            return !method.IsStatic;
        }

public class Rectangle
{
    public double Width;
    public double Height;
 
    public double Area()
    {
        return Width*Height;
    }
 
    public double Perimeter()
    {
        return 2*(Width + Height);
    }
}

public class Rectangle
{
    private double _width = 0;
    private double _height = 0;
 
    public double Width
    {
        get { return _width; }
        set { if (value > 0) { _width = value; } }
    }
 
    public double Height
    {
        get { return _height; }
        set { if (value > 0) { _height = value; } }
    }
 
    public double Area()
    {
        return _width * _height;
    }
 
    public double Perimeter()
    {
        return 2*(_width + _height);
    }
}

Rectangle rectangle = new Rectangle();
rectangle.Width = 10;
Console.WriteLine(rectangle.Width);

public class Product
{
    private string _name;
    public string Name
    {
        get { return _name; }
        set { _name = value; }
    }
}

public class Product
{
    public string Name { get; set; }
}

public class Student
{
    public DateTime Birthdate { get; set; }
 
    public double Age { get; private set; }
}

class Animal

var Animal;
Animal = (function() {
  function Animal() {}
  return Animal;
})();

animal = new Animal

class Animal
  constructor: (name) ->
    @name = name

var Animal;
Animal = (function() {
  function Animal(name) {
    this.name = name;
  }
  return Animal;
})();

class Animal
  constructor: (@name) ->

animal = new Animal "Cat"
alert "Animal is a #{animal.name}"

class Animal
  price: 5

  sell: (customer) ->

animal = new Animal
animal.sell(new Customer)

var Animal, animal;

Animal = (function() {
  function Animal() {}

  Animal.prototype.price = 5;

  Animal.prototype.sell = function(customer) {};

  return Animal;

})();

animal = new Animal;
animal.sell(new Customer);

class Animal
  this.find = (name) ->

Animal.find("Dog")

class Animal
  @find: (name) ->

Animal.find("Dog")

var Animal;

Animal = (function() {
  function Animal() {}

  Animal.find = function(name) {};

  return Animal;

})();

Animal.find("Dog");

و ویژگی‌های درخواست توسط سرویس http - AngularJs$ :

همینطور که میبینید، در هدر درخواست http$ یک مورد مفقود الاثر شده به نام X-Requested-With داریم و همین مقدار است که مشخص میکند این یک درخواست ایجکسی است یا خیر و اکستنشن ()IsAjaxRequest نیر با همین مقدار عمل تشخیص را انجام میدهد. و به همین خاطر بود که این متد مقدار False را برمیگرداند.

بعد از کمی جستجو در این مورد ، به مخزن git  انگیولار رسیدم و به صراحت به این موضوع اشاره شده بود که این هدر به صورت پیشفرض از درخواست‌های http$ برداشته شده است.

بنابراین تنها راه حل این بود که خودمان به صورت دستی این هدر خاص رو به ماژول برنامه اضافه کنیم. به صورت زیر :

myAppModule.config(['$httpProvider', function($httpProvider) {
    $httpProvider.defaults.headers.common["X-Requested-With"] = 'XMLHttpRequest';
}]);

با اضافه کردن این هدر به درخواست‌های http$ ، اکستنشن ()IsAjaxRequest مقدار درست را برمیگرداند.

Value 

// Behavior 1 
object obj = null;
bool objValueEqual = obj.Equals(null);

// Behavior 2 
object obj = null;
Type objType = obj.GetType();

// Behavior 3
string str = (string)null;
bool strType = str is string;

// Behavior 4
int num = 5;
Nullable<int> nullableNum = 5;
bool typeEqual = num.GetType() == nullableNum.GetType();

// Behavior 5
Type inType = typeof(int);
Type nullableIntType = typeof(Nullable<int>);
bool typeEqual = inType == nullableIntType;

        static void Main(string[] args)
        {
            Console.WriteLine(Method(null));
            Console.ReadLine();
        }
        private static string Method(object obj)
        {
            return "Object parameter";
        }
        private static string Method(string str)
        {
            return "String parameter";
        }

var rounded = Math.Round(1.5); // 2
var rounded = Math.Round(2.5); // 2

var rounded = Math.Round(2.5, MidpointRounding.ToEven); // 2
var rounded = Math.Round(2.5, MidpointRounding.AwayFromZero); // 3

var value = 1.4f;
var rounded = Math.Round(value + 0.1f); // 1

    public static class Config
    {
        public static bool ThrowException { get; set; } = true;
    }

    public class FailingClass
    {
        static FailingClass()
        {
            if (Config.ThrowException)
            {
                throw new InvalidOperationException();
            }
        }
    }

try
{
   var failedInstance = new FailingClass();
}
catch (TypeInitializationException) { }

Config.ThrowException = false;
var instance = new FailingClass();

public class BaseClass
{
    {
        public BaseClass()
        {
            VirtualMethod(1);
        }
        public virtual int VirtualMethod(int dividend)
        {
            return dividend / 1;
        }
    }

    public class DerivedClass : BaseClass
    {
        int divisor;
        public DerivedClass()
        {
            divisor = 1;
        }
        public override int VirtualMethod(int dividend)
        {
            return base.VirtualMethod(dividend / divisor);
        }
    }

 class Program
    {
        static void Main(string[] args)
        {
            var instance = new DerivedClass();
            var result = instance.Method();
            result = ((BaseClass)instance).Method();
            Console.WriteLine(instance + " -> " + result); // Derived Class ...  -> Method in BaseClass
            Console.ReadLine();

        }
    }

    public class BaseClass
    {
        public virtual string Method()
        {
            return "Method in BaseClass";
        }
    }

    public class DerivedClass : BaseClass
    {
        public override string ToString()
        {
            return "Derived Class ... ";
        }

        public new string Method()
        {
            return "Method in DerivedClass";
        }
    }

class Program
    {
        static void Main(string[] args)
        {
            var instance = new DerivedClass();
            var result = instance.Method(); // -> Method in DerivedClass
            result = ((IInterface)instance).Method(); // -> Method belonging to IInterface
            Console.WriteLine(result);
            Console.ReadLine();
        }
    }

    public interface IInterface
    {
        string Method();
    }

    public class DerivedClass : IInterface
    {
        public string Method()
        {
            return "Method in DerivedClass";
        }
        string IInterface.Method()
        {
            return "Method belonging to IInterface";
        }
}

private IEnumerable<int> GetEnumerable(StringBuilder log)
{
     using (var test = new Test(log))
      {
          return Enumerable.Range(1, 5);
      }
}

var log = new StringBuilder();
            
foreach (var number in GetEnumerable(log))
{
     log.AppendLine($"{number}");
}

Created
Disposed
1
2
3
4
5

 using (var test = new Test(log))
 {
     foreach (var i in Enumerable.Range(1,5))
     {
         yield return i;
     }
 }

Created
1
2
3
4
5
Disposed

  postTicket(ticket: Ticket, filesList: FileList): Observable<HttpEvent<any>> {

    //… the same as before

    const headers = new HttpHeaders().set("Accept", "application/json");
    return this.http
      .post(`${this.baseUrl}/SaveTicket`, formData, {
        headers: headers,
        reportProgress: true,
        observe: "events"
      })
      .map(response => response || {})
      .catch((error: HttpErrorResponse) => {
        console.error("observable error: ", error);
        return Observable.throw(error.statusText);
      });
  }

 postTicket(ticket: Ticket, filesList: FileList): Observable<HttpEvent<any>> {

{
  headers: headers,
  reportProgress: true,
  observe: "events"
}

  queueProgress: number;
  isUploading: boolean;
  uploadTimeRemaining: number;
  uploadTimeElapsed: number;
  uploadSpeed: number;

  submitForm(form: NgForm) {
    const fileInput: HTMLInputElement = this.screenshotInput.nativeElement;
    this.queueProgress = 0;
    this.isUploading = true;
    let startTime = Date.now();

    this.uploadService.postTicket(this.model, fileInput.files).subscribe(
      (event: HttpEvent<any>) => {
        switch (event.type) {
          case HttpEventType.Sent:
            startTime = Date.now();
            console.log("Request sent!");
            break;
          case HttpEventType.DownloadProgress:
          case HttpEventType.UploadProgress:
            if (event.total) {
              this.queueProgress = Math.round(event.loaded / event.total * 100);

              const timeElapsed = Date.now() - startTime;
              const uploadSpeed = event.loaded / (timeElapsed / 1000);
              this.uploadTimeRemaining = Math.ceil(
                (event.total - event.loaded) / uploadSpeed
              );
              this.uploadTimeElapsed = Math.ceil(timeElapsed / 1000);
              this.uploadSpeed = uploadSpeed / 1024 / 1024;
            }
            break;
          case HttpEventType.Response:
            this.queueProgress = 100;
            this.isUploading = false;
            console.log("Done! ResponseBody:", event.body);
            break;
        }
      },
      (error: HttpErrorResponse) => {
        this.isUploading = false;
        console.log(error);
      }
    );
  }

    <div *ngIf="queueProgress > 0">
      <table class="table">
        <thead>
          <tr>
            <th width="15%">Event</th>
            <th>Status</th>
          </tr>
        </thead>
        <tbody>
          <tr>
            <td><strong>Elapsed time</strong></td>
            <td nowrap>{{uploadTimeElapsed | number:'.1'}} second(s)</td>
          </tr>
          <tr>
            <td><strong>Remaining time</strong></td>
            <td nowrap>{{uploadTimeRemaining | number:'.1'}} second(s)</td>
          </tr>
          <tr>
            <td><strong>Upload speed</strong></td>
            <td nowrap>{{uploadSpeed | number:'.3'}} MB/s</td>
          </tr>
          <tr>
            <td><strong>Queue progress</strong></td>
            <td>
              <div class="progress-bar progress-bar-info progress-bar-striped" role="progressbar"
                aria-valuemin="0" aria-valuemax="100" [attr.aria-valuenow]="queueProgress"
                [ngStyle]="{ 'width': queueProgress + '%' }">
                {{queueProgress}}%
              </div>
            </td>
          </tr>
        </tbody>
      </table>
    </div>

    <button class="btn btn-primary" [disabled]="form.invalid || isUploading" type="submit">Submit</button>

> Install-Package Castle.Core
> dotnet add package Castle.Core

<Project Sdk="Microsoft.NET.Sdk.Web">
  <ItemGroup>
    <PackageReference Include="castle.core" Version="4.3.1" />
  </ItemGroup>
</Project>

using System;
using Castle.DynamicProxy;
using Microsoft.Extensions.Logging;

namespace CoreIocSample02.Utils
{
    public class ExceptionHandlingInterceptor : IInterceptor
    {
        private readonly ILogger<ExceptionHandlingInterceptor> _logger;

        public ExceptionHandlingInterceptor(ILogger<ExceptionHandlingInterceptor> logger)
        {
            _logger = logger;
        }

        public void Intercept(IInvocation invocation)
        {
            try
            {
                invocation.Proceed(); //فراخوانی متد اصلی در اینجا صورت می‌گیرد
            }
            catch (Exception ex)
            {
                _logger.LogCritical(ex, "An unhandled exception has been occurred.");
            }
        }
    }
}

        public void Run()
        {
            try
            {
                _decorated.Run();
            }
            catch (Exception ex)
            {
                _logger.LogCritical(ex, "An unhandled exception has been occurred.");
            }
        }

namespace CoreIocSample02
{
    public class Startup
    {
        private static readonly ProxyGenerator _dynamicProxy = new ProxyGenerator();

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddTransient<ITaskService, MyTaskService>();
            services.AddTransient<ExceptionHandlingInterceptor>();
            services.Decorate(typeof(ITaskService),
             (target, serviceProvider) =>
                _dynamicProxy.CreateInterfaceProxyWithTargetInterface(
                  interfaceToProxy: typeof(ITaskService),
                  target: target,
                  interceptors: serviceProvider.GetRequiredService<ExceptionHandlingInterceptor>())
            );

<input dir="ltr" class="form-control input-validation-error" 
type="email" 
data-val="true" 
data-val-email="'آدرس ایمیل' is not a valid email address." 
data-val-remote="این آدرس ایمیل هم اکنون مورد استفاده‌است" 
data-val-remote-url="/Home/ValidateUniqueEmail" 
data-val-required="'آدرس ایمیل' must not be empty." 
id="Email" 
name="Email" 
>

using System.ComponentModel.DataAnnotations;

namespace FluentValidationSample.Models
{
    public class UserModel
    {
        [Display(Name = "نام کاربری")]
        public string Username { get; set; }

        [Display(Name = "سن")]
        public int Age { get; set; }

        [Display(Name = "سابقه کار")]
        public int Experience { get; set; }

        [DataType(DataType.EmailAddress)]
        [Display(Name = "آدرس ایمیل")]
        public string Email { get; set; }
    }
}

using System.Linq;

namespace FluentValidationSample.Services
{
    public interface IUsersService
    {
        bool IsUniqueEmail(string emailAddress);
    }

    public class UsersService : IUsersService
    {
        public bool IsUniqueEmail(string emailAddress)
        {
            string[] registedEmails = {
                "email@site.com",
                "test@gmail.com"
            };
            return !registedEmails.Contains(emailAddress);
        }
    }
}

namespace FluentValidationSample.Web
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddScoped<IUsersService, UsersService>();

using FluentValidation.Validators;
using FluentValidationSample.Services;

namespace FluentValidationSample.ModelsValidations
{
    public class UniqueEmailValidator : PropertyValidator
    {
        private readonly IUsersService _usersService;

        public UniqueEmailValidator(IUsersService usersService)
                : base("این آدرس ایمیل هم اکنون مورد استفاده‌است")
        {
            _usersService = usersService;
        }

        protected override bool IsValid(PropertyValidatorContext context)
        {
            return context.PropertyValue != null &&
                    _usersService.IsUniqueEmail((string)context.PropertyValue);
        }
    }
}

using FluentValidation;
using FluentValidationSample.Services;

namespace FluentValidationSample.ModelsValidations
{
    public static class CustomValidatorExtensions
    {
        public static IRuleBuilderOptions<T, string> UniqueEmail<T>(
            this IRuleBuilder<T, string> ruleBuilder, IUsersService usersService)
        {
            return ruleBuilder.SetValidator(new UniqueEmailValidator(usersService));
        }
    }
}

using FluentValidation;
using FluentValidationSample.Models;
using FluentValidationSample.Services;

namespace FluentValidationSample.ModelsValidations
{
    public class UserModelValidator : AbstractValidator<UserModel>
    {
        public UserModelValidator(IUsersService usersService)
        {
            RuleFor(x => x.Username).NotNull();
            RuleFor(x => x.Age).NotNull();
            RuleFor(x => x.Experience).LowerThan(nameof(UserModel.Age)).NotNull();
            RuleFor(x => x.Email).EmailAddress().NotNull().UniqueEmail(usersService);
        }
    }
}

using FluentValidation;
using FluentValidation.AspNetCore;
using FluentValidation.Internal;
using FluentValidation.Resources;
using FluentValidation.Validators;
using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;

namespace FluentValidationSample.ModelsValidations
{
    public class RemoteClientValidator : ClientValidatorBase
    {
        public string RemoteUrl { set; get; }

        public RemoteClientValidator(PropertyRule rule, IPropertyValidator validator) :
            base(rule, validator)
        {
        }

        public override void AddValidation(ClientModelValidationContext context)
        {
            MergeAttribute(context.Attributes, "data-val", "true");
            MergeAttribute(context.Attributes, "data-val-remote", GetErrorMessage(context));
            MergeAttribute(context.Attributes, "data-val-remote-url", RemoteUrl);
        }

        private string GetErrorMessage(ClientModelValidationContext context)
        {
            var formatter = ValidatorOptions.MessageFormatterFactory().AppendPropertyName(Rule.GetDisplayName());
            string messageTemplate;
            try
            {
                messageTemplate = Validator.Options.ErrorMessageSource.GetString(null);
            }
            catch (FluentValidationMessageFormatException)
            {
                messageTemplate = ValidatorOptions.LanguageManager.GetStringForValidator<NotEmptyValidator>();
            }
            return formatter.BuildMessage(messageTemplate);
        }
    }
}

<input dir="ltr" class="form-control input-validation-error" 
type="email" 
data-val="true" 
data-val-email="'آدرس ایمیل' is not a valid email address." 
data-val-remote="این آدرس ایمیل هم اکنون مورد استفاده‌است" 
data-val-remote-url="/Home/ValidateUniqueEmail" 
data-val-required="'آدرس ایمیل' must not be empty." 
id="Email" 
name="Email" 
>

namespace FluentValidationSample.Web
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddScoped<IUsersService, UsersService>();

            services.AddControllersWithViews().AddFluentValidation(
                fv =>
                {
                    fv.RegisterValidatorsFromAssembly(Assembly.GetExecutingAssembly());
                    fv.RegisterValidatorsFromAssemblyContaining<RegisterModelValidator>();
                    fv.RunDefaultMvcValidationAfterFluentValidationExecutes = false;

                    fv.ConfigureClientsideValidation(clientSideValidation =>
                    {
                        // ...

                        clientSideValidation.Add(
                            validatorType: typeof(UniqueEmailValidator),
                            factory: (context, rule, validator) =>
                                        new RemoteClientValidator(rule, validator)
                                        {
                                            RemoteUrl = "/Home/ValidateUniqueEmail"
                                        });
                    });
                }
            );
        }

namespace FluentValidationSample.Web.Controllers
{
    public class HomeController : Controller
    {
        private readonly IUsersService _usersService;

        public HomeController(IUsersService usersService)
        {
            _usersService = usersService;
        }

         // ...

        public IActionResult ValidateUniqueEmail(string email)
        {
            return Ok(_usersService.IsUniqueEmail(email));
        }
    }
}

<script src="~/lib/jquery/dist/jquery.min.js"></script>
<script src="~/lib/bootstrap/dist/js/bootstrap.bundle.min.js"></script>
<script src="~/lib/jquery-validation/dist/jquery.validate.js"></script>
<script src="~/lib/jquery-validation-unobtrusive/jquery.validate.unobtrusive.js"></script>
<script src="~/js/site.js" asp-append-version="true"></script>

namespace Models
{
    public class Book
    {
        public int ID { get; set; }
        public string Title { get; set; }
        public string Author{get;set;}
        public int PublishYear { get; set; }
    }
}