- What is MVC?
Answer: You can say it’s a
design pattern or framework or library. For
any answer you should have a concrete response as we can prove that MVC can be
anyone of these [Design Pattern/Library/Framework].
- . Why we need MVC, why not only ASP.net?
Answer: Over net you will
find the answers like Separation of Concern, Unit Test, TDD [Test driven development]
etc.
My Sincere suggestion would
be, first you say it is open source and you have lot of option to customize
existing MVC components as per your project requirement [Like Custom HTML
helper, Custom Validation, Custom Action Result etc.].
Another basic advantage is
URL – which you can customize on your own.
For example: http://localhost:80/Employee/Details/5
instead of http://localhost:80/EmployeeDetails.aspx
or hide the existing URL through attribute routing [MVC5]. URL works like a sitemap for end user which
makes them feel happy.
Performance – as there is no
ViewState for any control MVC is lightweight compare to asp.net.
If you have two separate teams
(one for UI, another for dot net), both can works parallel without impacting
others as there is no strongly coupled component. Like in ASP.net for ‘Button1’
you will have ‘Button1_Click ()’ event.
Compatibility or adaptability
with different device and different browsers using multiple option of MVC like
Display mode/ ViewPort of @media query, bootstrap etc.
Filters are too easy to work
rather than httpHandler or httpmodule.
Support of all modern Plugin/tools
like Telerik Kendo UI, Bootstrap, Knockout, angular, node etc.
- Can you write a code to have a custom validation?
Answer: Basically interviewer
wants to know here whether you know the basic components to write a custom
validation or not.
Those are ‘ValidationAttribute’,
which you need to inherit/implement into your class and the method which you
have to override is ‘IsValid’ which will have multiple overloaded options. If
you want to get some another member inside Isvalid method you can use
ValidationContext. Sample example you can find here. 1 2
3
- . How can you add validation over URL in MVC or how to have Routing constraints?
Answer: Please find the
answer here.
- For example, inside an Action method in your controller, you will be returning like below.
If(x == “MainWindow”)
return View(‘Test’,listEmployee);
else if (x==”PartialWindowForFilterData”)
return Json(listEmployee,
JsonRequestBehavior.AllowGet);
else
return View();
The above statement is
purely valid. Now, what will be the return type of this method ?
Answer : ActionResult. As ‘ActionResult’
is top of all other result type.
- How will you create a filter? ( Not specific to authentication/Authorization/Action/Exception).
Answer: Add a folder into
your solution, Add a class , inherit ‘filterAttribute’ class into your class, add a entry into FilterConfig.cs
inside App Start folder or Global.asax file.
- Now how make this filter as global? Or, without mentioning filterAttribute top of every controllers or every action methods, get the functionality of filter attribute on top of every controllers.
Answer: Make the same filter
you created before as global. How? Inside FilterConfig or Application_Start()
of Global.asax like below.
GlobalFilters.Filters.Add(new MyActionFilterAttribute());
- How you create a custom HTML helper? How to make custom HTML helper accessible globally.
- Why we use area in MVC? How you communicate over areas?
Answer: Area got introduced
in MVC 2.0. The basic purpose is to separate multiple different sets [controller-model-view]
using a block/container called area based on the usability purpose.
For example: Admin may have
a set of controller model and view which may not be related much with Normal
end user. They can communicate through each other using multiple option like
@HTML.ActionLink(“LinkName”, “Contrller”,”Action”,”area”,”htmlAttribute”)
- How to customize[Show, hide, segregate ] model properties ?
Answer: you have multiple
options to do that.
i)
Use ScafoldColumn to false to hide a property into view.
ii)
Use Display(Name = “SomeDifferentName”)
Over model class to display some different name.
iii)
Use ViewModel.
iv)
Use Bind class.
v)
Use IModelBinder
Do google, you will get example and solution for each one of the above.
- How request flow in MVC
I will come with few more interview question
for experienced in next.
You can follow this
for a good reference written by my best mentor.
