Top 100+ Net Core Interview Questions And Answers

Question 1. What Are The Advantages Of The Inclusion Of Nuget Packages In Asp.Net Core 1.0?

Answer :

The inclusion of Nuget Packages will make the applications to be optimized as we want to include most effective those programs that we need. The advantages includes 

Better performance gain 
Secured Application 
Improved and decreased servicing 
Pay for what you operate version 
Lightweight
Question 2. What Is Asp.Net Core 1.Zero?

Answer :

Asp.Internet Core1.0 is the next version of Asp.Internet which is 5.0. It is open supply and move-platform framework (supports for Windows, Mac and Linux) appropriate for building cloud primarily based internet connected programs like web apps, IoT apps and cell apps.Asp.Net Core has made itself impartial of System.Web.Dll and is heavily primarily based on the modular NuGet programs.

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Question 3. What Is The Purpose Of Webhostbuilder() Function?

Answer :

It is find to accumulate the HTTP pipeline via webHostBuilder.Use() chaining all of it together with WebHostBuilder.Build() by using the usage of the builder sample. It is available inside the Microsoft.AspNet.Hosting namespace.The reason of the Build approach is to build the required offerings and a Microsoft.AspNetCore.Hosting.IWebHost which hosts an internet application.

Question four. What Is The Purpose Of Useiisintegration?

Answer :

UseIISIntegration configures the port and base path the server have to pay attention on whilst jogging at the back of AspNetCoreModule. The app may also be configured to seize startup mistakes. WebHostBuilder uses the UseIISIntegration for hosting in IIS and IIS Express.

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Question 5. What Is The Purpose Of Configureservices In Asp.Internet Core 1.Zero?

Answer :

ConfigureServices defines the services utilized by the software like ASP.NET MVC Core framework, Entity Framework Core, CORS,Logging, MemoryCaching and so forth. 

E.G. 

Public void ConfigureServices(IServiceCollection offerings)

    // Add framework services.

Offerings.AddApplicationInsightsTelemetry(Configuration);

    offerings.AddMvc();            

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Question 6. Explain The Purpose Of Configure Method?

Answer :

Configure method defines the middleware inside the Http request pipeline. The software program additives that are assembled into an software pipeline to deal with requests and responses are the middlewares. 

E.G. 

Public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)

   loggerFactory.AddConsole(Configuration.GetSection("Logging"));

    loggerFactory.AddDebug();

    app.UseApplicationInsightsRequestTelemetry();

    if (env.IsDevelopment())

    

      app.UseDeveloperExceptionPage();

        app.UseBrowserLink();

    

    else

    

        app.UseExceptionHandler("/Home/Error");

    

    app.UseApplicationInsightsExceptionTelemetry();

    app.UseStaticFiles();

    app.UseMvc(routes =>

    

        routes.MapRoute(

            name: "default",

            template: "controller=Home/motion=Index/identification?");

    );

In the above code,UseExceptionHandler is a middleware. It is brought as a middleware to the pipeline so as to seize exceptions, log them, reset the request path, and re-execute the request.

Question 7. What Is The Purpose Of Usedeveloperexceptionpage()?

Answer :

This approach belongs to the Microsoft.AspNetCore.Builder namespace of USEDeveloperExceptionPage Extensions static elegance. The reason of this characteristic is to capture synchronous and asynchronous System.Exception times from the pipeline and generates HTML blunders responses. It returns a connection with the app after the operation is finished.We use the UseDeveloperException() extension method to render the exception throughout the improvement mode.

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Question eight. What Is The Purpose Of Addsingleton Method?

Answer :

The AddSingleton method, provides a singleton provider of the type laid out in TService with an implementation kind laid out in TImplementation to the desired Microsoft.Extensions.DependencyInjection.IServiceCollection. It returns a reference to this instance after the operation has completed. 

The general syntax is 

public static IServiceCollection AddSingleton<TService, TImplementation>(this IServiceCollection offerings)

            where TService : elegance

            where TImplementation : magnificence, TService;

Services may be registered with the container in several ways.In this situation we're the usage of Singleton Service by the use of the AddSingleton<IService, Service>() approach.Singleton lifetime offerings are created the first time they're asked after which each subsequent request will use the equal instance. If the software calls for singleton behavior, permitting the services box to control the service's lifetime is usually recommended in place of implementing the singleton design sample and handling the object's lifetime within the class. 

E.G. 

Public void ConfigureServices(IServiceCollection services)

    // Add framework services.           

    Offerings.AddSingleton<IEmployeeRepository, EmployeeRepository>();

Question nine. What Is Transfer-encoding?

Answer :

The encoding used to transfer the entity to the person. It is ready to Chunked indicating that Chunked switch encoding data transfer mechanism of the Hypertext Transfer Protocol (HTTP) is initiated wherein statistics is sent in a sequence of "chunks".

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Question 10. What Is X-sourcefiles?

Answer :

It is the custom header. It incorporates the base64-encoded direction to the supply record on disk and is used to hyperlink a page's generated output again to that supply report. It's only generated for localhost requests.

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Question eleven. How To Scaffold Model From Existing Database In Asp.Internet Mvc Core?

Answer :

To scaffold fashions from existing database in ASP.NET MVC Core, visit Tools –> NuGet Package Manager –> Package Manager Console 

Now execute following command:

Scaffold-DbContext "Server=datbase-PC;Database=TrainingDatabase;Trusted_Connection=True;MultipleActiveResultSets=genuine;" Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models 

If you get an errors "The time period 'Scaffold-DbContext' isn't identified because the name of a cmdlet" , simply Close the Visual Studio and open once more. 

This creates .Cs files associated with all database tables into Models folder of your assignment. This additionally creates a database context (in this case the call can be TrainingDatabaseContext.Cs as the database call is TrainingDatabase).

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Question 12. What Is .Net Core?

Answer :

A go-platform version of .NET, that helps almost all matters that .NET supported (besides things like WPF, Windows Forms, Web Forms and Active Directory)
It is leaner, quicker and progressed version of .NET
.NET Core and ASP.NET Core are FREE and Open Source however additionally they are supported by way of Microsoft.
It is kinda the new .NET framework
Main framework that Microsoft has been specializing in is .NET Core
The .NET Core Runtime installation file is best approximately 20 MBs
.NET Core gives dotnet CLI – command line interface
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Question thirteen. What Is Asp.Internet Core?

Answer :

ASP.NET Core is a modern day go-platform web framework constructed with .NET Core framework.

It isn't an update to current ASP.NET framework. It is a whole rewrite of the ASP.NET framework. It was built from scratch in the attempt to make a modular, scalable, first-rate speedy, configurable, cross-platform and without difficulty extended web framework.

ASP.NET Core (on Linux!) itself can cope with over 2 000 000 – 2 Million requests in line with 2nd for plaintext request/response scenarios. ASP.NET Core MVC can handle over 1 million requests in keeping with 2nd! Compared to Node.Js, that could deal with about four hundred 000 requests in step with 2d, this is an super attempt.

It works with each .NET Core and .NET Framework.

ASP.NET Core is much purifier and less complicated to paintings with. You best want to write down 20~30 traces of code and you've the web server geared up to run. It additionally works easily along with your document gadget, so can just copy and paste documents on your task folder. And no, you don’t want to reference those documents from a .Csproj record.

Main characterestics of ASP.NET Core:

DI Container that's pretty easy and integrated. You can make bigger it with different famous DI packing containers
Built-in and extensible dependent logging. You can redirect output to as many assets as you want (file, Azure, AWS, console)
Extensible strongly typed configuration, which can also be used to reload at run-time
Kestrel – new, cross-platform and incredible speedy internet server which can stand by myself without IIS, Nginx or Apache
New, completely async pipeline. It is without problems configured through middleware
ASP.NET All meta bundle which improves development pace, and permits you to reference all Microsoft packages for ASP.NET Core and it's going to set up handiest the ones which are being used by your code
There is not any net.Config. We now use appsettings.Json file in combination with different sources of configuration (command line args, surroundings variables, and so forth.)
There is no Global.Asax – We have Startup.Cs that is used to set up Middleware and offerings for DI Container.
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Question 14. What Is .Net Standard?

Answer :

.NET Standard is a hard and fast of APIs that every one .NET structures ought to put in force. This unifies the .NET structures and prevents future fragmentation.
.NET Standard 2.0 is applied by .NET Framework, .NET Core, and Xamarin. For .NET Core, this added a number of the present APIs that have been asked.
.NET Standard 2.0 includes a compatibility shim for .NET Framework binaries, extensively increasing the set of libraries that you can reference from your .NET Standard libraries.
.NET Standard will replace Portable Class Libraries (PCLs) because the tooling story for constructing multi-platform .NET libraries.
Question 15. Can Asp.Net Core Work With The .Net Framework?

Answer :

Yes. This might surprise many, but ASP.NET Core works with .NET framework and that is formally supported by means of Microsoft.

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Question 16. Dependency Injection In Asp.Net Core?

Answer :

Dependency Injection comes as part of ASP.NET Core Framework and the whole thing is built round it. When you need to use some tool and its offerings, you typically upload the NuGet package deal and you use certainly one of its extension techniques to add the bundle to the ASP.NET Core’s DI box. You can extend the present day DI with a container of your preference (AutoFac, StructureMap, CastleWindsor and many others).

Question 17. The Configuration In Asp.Internet Core?

Answer :

Another essential part of ASP.NET Core Framework is Configuration. Also, it is part of Dependency Injection. Use it anywhere in your code with an option to reload on changes of configuration values from assets (appsettings.Json, surroundings variables, command line arguments, and so on.). It is also easy to override, make bigger and customise the Configuration. No more vast configurations in net.Config, the favored way now is appsettings.Json in combination with a mixture of Environment variables and cmd-line args.

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Question 18. Talk About Logging In Asp.Net Core?

Answer :

Logging is built-in and you get access to dependent logs from the ASP.NET Core host itself to your software. With gear like Serilog, you could increase your logging easily and store your logs to document, Azure, Amazon or every other output issuer. You can configure verbosity and log degrees via configuration (appsettings.Json by default), and you could configure log degrees by way of specific classes.

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Question 19. Explain Startup Process In Asp.Internet Core?

Answer :

Everything begins from Program.Cs

public static void Main(string[] args)

    BuildWebHost(args).Run();

public static IWebHost BuildWebHost(string[] args) =>

    WebHost.CreateDefaultBuilder(args)

        .UseStartup()

        .Build();

CreateDefaultBuilder extension approach will create a default configuration to be able to appearance first into appsettings.Json files then will search for Environment variables and on the stop, it'll use command line arguments.

This element will also installation default logger assets (debug and console) and cargo the settings for logging from appsettings.Json.

After the CreateDefaultBuilder finishes, then Startup magnificence is carried out. First, the constructor code is accomplished. After that, offerings are added to DI box thru AddServices technique that lives in Startup magnificence. After that, an order of middleware so as to take care of every incoming request is installation.

Question 20. Talk About New .Csproj File?

Answer :

.Csproj report is now used as a place wherein we control the NuGet packages for your application.

File explorer and assignment explorer at the moment are in sync. For .NET Core projects, you could without problems drop a document from report explorer into a undertaking or delete it from the document device and it will likely be long past from the task. No greater source files in a .Csproj document.

You can now edit the .Csproj file at once without unloading the project.

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Question 21. What Is Razor Pages?

Answer :

Razor Pages is a new characteristic of ASP.NET Core that makes coding web page-targeted scenarios easier and more productive.

With Razor Pages, you have got this one Razor report (.Cshtml), and the code for a unmarried web page lives interior of that record, and that record additionally represents the URL structure of the app (greater approximately this later). Therefore, you got everything interior of 1 report, and it just works.

However, you CAN separate your code to the code behind document with .Cshtml.Cs extension. You would generally have your view model and handlers (like motion methods in MVC) in that file and cope with the logic there. Of path, you may additionally have your view model moved to split location.

Since Razor Pages is a part of the MVC stack, you may use something that incorporates MVC inner of our Razor Pages.

Question 22. What About Static Files In Asp.Internet Core (mvc)?

Answer :

All static files are now (by means of default) positioned inside of wwwroot folder. You shop your CSS, JS, snap shots, fonts  and others static content inner of it.

Question 23. What Is Startup.Cs In Asp.Internet Core?

Answer :

In ASP.NET, Global.Asax acts because the access point to your software. 
In ASP.Internet Core,startup.Cs is the access point on your utility.
In Startup.Cs document
The constructor hundreds the AppSettings.Json document the usage of ConfigurationBuilder elegance
The ConfigureServices() method adds the offerings required by using the application. For instance, here you add MVC and Entity Framework to the offerings series.
The Configure() approach specifies and configures the services brought in advance for application’s use.
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Question 24. What Are The Various Json Files In Asp.Internet Core?

Answer :

global.Json: can outline answer degree settings in worldwide.Json file 
launchsettings.Json: can outline challenge specific settings associated with each profile Visual Studio is configured to launch the software, such as any environment variables that have to be used. You can define framework in your undertaking for compliation and debugging for unique profiles. 
Appsettings.Json: to shop custom software placing, DB connection strings,Logging and so forth 
bundleconfig.Json: can outline the configuration for bundling and minification for the challenge. 
Undertaking.Json: storing all task stage configuration settings 
bower.Json: Bower is a package supervisor for the internet. Bower manages additives that include HTML, CSS, JavaScript, fonts or even photo documents. Bower installs the right variations of the packages you want and their dependencies
Advanced Dot Net Interview Questions
Question 25. Differences Between .Net Core And .Internet Framework?

Answer :

The variations among the two may be summarized in these 3 points:

NuGet-based: .NET Core is shipped as a set of NuGet packages that permit app-local deployments. In comparison, the .NET Framework is continually hooked up in a system-extensive vicinity. This difference doesn’t be counted a lot for class libraries; however it matters for packages as the ones are anticipated to install the closure of their dependencies. But we assume this version to alternate how quickly class library authors can take gain of latest functionality. Since the programs can in reality installation a new edition (in preference to having to attend till a given .NET Framework version is widely adopted), there is much less of a penalty for factor authors to take advantage of the modern-day capabilities.

Well layered: .NET Core became specially designed to be layered. The aim become to create a .NET stack that may accommodate a huge form of skills and gadget constraints with out forcing customers to recompile their binaries and/or produce new belongings. This way that we needed to cast off positive APIs due to the fact they tied lower degree components to better level additives. In the ones instances, we offer alternatives, frequently inside the form of extension methods.

Free of elaborate tech: .NET Core doesn’t include certain technology we decided to discontinue because we found them to be problematic, as an example AppDomain and sandboxing. If the situation nonetheless makes experience for .NET Core, our plan is to have replacements. For instance, AssemblyLoadContext replaces AppDomains for loading and separating assemblies.

Question 26. Explain .Net Family Of Frameworks?

Answer :

.NET Framework is the "full" or "traditional" flavor of .NET it truly is dispensed with Windows. Use this when you are building a computer Windows app or working with ASP.NET four.Five/four.6.

.NET Core is go-platform .NET which can run on Windows, Mac, and Linux. Use this when you need to construct programs which could run on any platform, including ASP.NET Core (cross-platform net programs).

Xamarin (Mono) is used for constructing mobile apps which can run on iOS, Android, or Windows Phone devices.

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Question 27. What Is The Relationship Between .Internet Core And .Internet Framework?

Answer :

.NET Core and the .NET Framework have (for the maximum component) a subset-superset relationship. .NET Core is called "Core" because it contains the center capabilities from the .NET Framework, for each the runtime and framework libraries. For instance, .NET Core and the .NET Framework percentage the GC, the JIT and brands inclusive of String and List

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Question 28. What Are Technologies Discontinued In .Internet Core?

Answer :

Reflection
Appdomain
Remoting
Binary serialization
Sandboxing