In this blog post, I will share frequently most asked asp.net Core interview questions and answers for freshers and experienced professionals/developers to get the right job. Find the list below:-

• Keep reading on ASP.NET MVC interview questions and answers 2020

ASP.NET Core Interview Questions

Introducing ASP.NET Core

• What is the ASP.NET Core?
• What are the features provided by ASP.NET Core?
• What is Metapackages?
• What are the advantages of ASP.NET Core over ASP.NET?
• What is the startup class in ASP.NET core?
• What is the use of ConfigureServices method of startup class?
• What is the use of the Configure method of startup class?

Middleware and Routing

• How to add middleware to the application request pipeline?
• What is the difference between IApplicationBuilder.Use() and IApplicationBuilder.Run()?
• What is the use of the “Map” extension while adding middleware to the ASP.NET Core pipeline?
• What is the use of the “MapWhen” extension while adding middleware to the ASP.NET Core pipeline?
• What is middleware?
• How can we configure the pipeline for middleware?
• What is built-in middleware(s) with ASP.NET Core?
• Can we write our own middleware?
• What is routing in ASP.NET Core?
• How can we configure conventional routing?
• What’s happened MVC finds two disambiguating actions through routing?
• What is Attribute routing?
• Does ASP.NET Core support mix routing i.e. both conventional and attribute routing together?
• How can we define a route for areas?

Session and Environment Settings

• How to enable Session in ASP.NET Core?
• How many types of session state is available in ASP.NET Core?
• How to access the session in the ASP.NET Core application?
• Why Session is stored in the form of a byte array in ASP.NET Core?
• Is there any sequence to call UseSession() method in the Configure method?
• Can we store the Complex data into the session?
• How to set an environment variable?
• Key for environment variable is case-sensitive?
• How determine the value of an environment variable programmatically?
• What are the various JSON files available in ASP.NET Core?
• What is the use of the “launchsettings.json” file?
• What is the use of the “appsettings.json” file?
• What is the use of the “bower.json” file?

Razor Pages and View Component

• What are the Razor Pages in ASP.NET Core?
• How can we prevent Razor pages from XSRF/CSRF attack?
• How can we do an automatic model binding in Razor pages?
• How can we be binding the route data in Razor pages?
• What is the use of the ViewData attribute in Razor pages?
• How can we apply filters in Razor pages?
• What is the RCL (Razor Class Library) project?
• What happened if view, partial view, or Razor Page found in both RCL and web application?
• What is the view component in ASP.NET Core?
• What are the features provided by the ViewComponent?
• How can we create ViewComponent?
• What is the default path of view for ViewComponent?
• Can we have an invoked view component from the controller?

Model Binding and Validations

• What is Model binding?
• How does model binding work in the ASP.NET Core application?
• What are the characteristics of a complex type for binding the value?
• Can we control the behavior of Model binding using attributes?
• Can we create a custom model binder? If yes how?
• How can we use/register a custom model binder?
• How can we apply a custom model binder using the ModelBinder attribute?
• How can we apply custom model binder globally?
• How can we do model validation with ASP.NET Core?
• How can we check our model is valid or not at the controller level?
• Can we validate the model manually in the Controller class?
• How can we do Client-side validation?

Globalization and Localization

• What is Internationalization in ASP.NET Core?
• What is a resource file naming convention?
• How can we achieve localization in view?
• How can we access the localized resource string in the Controller?
• Can we localize error messages defined in Data Annotation?

Exception Handling and Logging Framework

• What is the “Developer Exception Page” in ASP.NET Core?
• How can we configure custom exception handling page in ASP.NET Core?
• How to configure the logging framework in ASP.NET Core?
• What are the possible values for Log level enum for the Logging framework?
• How many built-in extension methods provided by the logging framework of ASP.NET Core?
• What is the use of enum value LogLevel.None?
• How to set default minimum log level for Logging Framework?
• How to define filter rule for the Logging framework in ASP.NET Core?
• What is the logging scope in the Logging framework?
• What is third party logging framework that supported by ASP.NET Core?

Security and Filters

• What is the use of a filter in the ASP.NET Core application?
• Explain the filter types available in the ASP.NET Core application?
• In which sequence all the filters are invoked?
• How to create a custom filter?
• Does the filter support asynchronous implementation?
• How to implement the asynchronous filter in ASP.NET Core?
• Explain about the Filter scope?
• How to define a Global filter in ASP.NET Core?
• What is the Default order of filter execution?
• Can we override the default order of execution of filter in ASP.NET Core?
• Does the built-in filter also implement the interface IOrderFilter?
• Can we cancel the execution of filter or short-circuiting filters?
• Can we inject the dependency on the filter attribute?
• Can you apply a filter attribute having constructor dependency to the controller or action?
• What is the exception filter in ASP.NET Core?
• What is a limitation of the Exception filter?
• What is the use of the Result Filter in ASP.NET Core?
• What are Authentication and Authorization?
• How can we configure built-in identity service for ASP.NET Core application?
• What is the difference between AddDefaultIdentity and AddIdentity?
• How can we override default configuration?
• How can we configure windows authentication for the ASP.NET Core application?

Unit Testing

• What Unit Testing frameworks can be used with ASP.NET Core?
• How can we write a unit test with the MSTest framework?
• Can we create an MSTest project using the command-line interface (CLI)?
• How can we verify the test in MSTest?
• How can we run the test?
• Can we write a data-driven test using MSTest?
• How can we write a unit test with xUnit framework?
• How can we verify the test in xUnit?
• Can we write a data-driven test using xUnit?
• How can we write a unit test with NUnit framework?
• How can we verify the test in NUnit?
• Can we write a data-driven test using NUnit?
• What is the use of setup attributes in the NUnit framework?
• How can we create a test for the controller that has service dependency?
• What is a Mock (or moq) object in a unit test?

Deployment

• What are the different techniques for hosting an ASP.NET Core application?
• What is Kestrel?
• How to use Kestrel in ASP.NET Core application?
• Can we bind TCP socket with the Kestrel server?
• What is the HTTP.sys server?
• What are the features are supported by the HTTP.sys server?
• How to host an application using HTTP.sys server?
• How can we host the ASP.NET Core application as a Windows service?
• What is ASP.NET Core Module?

References: Microsoft Docs – ASP.NET Core, Stack Overflow – ASP.Net Core Interview Questions

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