C# Tutorial 7 Inheritance Polymorphism

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In this part of my C# Tutorial we learn about Inheritance, Aggregations, Virtual, Override, Inner Classes, New, Base, Polymorphism and much more.

For best results take notes on the cheat sheet provided above as you watch and leave any questions you have.

Thank you to Patreon supporters like the following for helping me make this video

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[Pavel_Franta]

Thank you, Derek, for your videos, guys like you CAN change or significantly help with changing others careers or growing knowledge of programming. Guys like you started off new era of independent home learning and i am very grateful for your videos and your effort to help and teach other guys how to write a code. Thank you very much, Pavel

[mattmarkus]

8:55 it should be noted that the Animal constructor will _always_ be called first when you instantiate a Dog or any other child class. And if you don’t use :base() it will be the Animal’s parameterless constructor that runs. If you do use :base() it will call the Animal’s corresponding constructor based on what you pass to base(). But in all cases the Animal’s constructor will be called first. Use :base () if you want a specific parameterized constructor in the parent class to run when creating the child class.

[AlecPaulKISS]

this is the best example for OOP inheritance and polymorphism, thank you

[NextLevelNoob]

Thank you Derek, your work is greatly appreciated.

[JackBauerDev]

Hey Derek, Nice video, but line 65 doesn't make sense I think. if any chars in the value are not equal to digits, set name = "No name" ELSE set name = value (IF THERE ARE NUMBERS)

[wizkid]

I actually develop in c# all the time. It is my favorite programing language. Even though I know all this stuff I still enjoy watching these tutorials.

[TheDigitalConsultant]

Wow, you have a way of explaining things that make much more sense than most of my old programming professors! So glad I found your channel, thank you!

[noturbbyy]

When I watched the video, I was generally impressed because in this 24 minutes video I learned stuff that I would learn for months at school. The video is excellent despite some of the misunderstandings :)

[alexpajp]

Thank you! It's been hard to find some good examples and tuorials on this stuff! You're the real MVP.

[battou]

If Im not wrong, then you missed the other way to get deriver version of Spot's make sound method while it is still marked as New. You could check if Spot is of a Dog type and then cast it to Dog and call its Make sound method.

That way you can use both implementations if needed.

[Denis]

Thank you very much for the pretty much comprehensive tutorials, Derek. By the way, there's an error in the Animal.cs file: the setter of the Name property shouldn't have the "!", so it should look like this "if (value.Any(char.IsDigit))" else animals' names will be "No name".

[SunnyApples]

Thank you for the video Derek!!
I can' believe that my dream of getting into C# and game development is actually happening!
I can't wait for the next part!

[RightySnipeZ]

I spent ages trying to find a video to learn this. Subscribed!

[CanadianMang]

Is it just me or the way you set up the Get for Name is not right.
You have:

if(!value.Any(char.IsDigit))
{
name = "No Name"
}
name = value;

If I'm reading this correct your saying that if you don't have a digit in value then make name = "No Name" and then after that make name = value;

So if you have a digit it will make the name = "No Name" and then right after the if statement make name = value;

[Mentalfrog]

When would i use the "new" keyword instead of overriding a method?

[fedorbilev]

4:45 (!value.Any(...)) - > (should be) value.Any(...)

[AniketRajPhotographySpring]

I have watched seven c# videos today, and must say ... I am a fan! Subscribed!

[bartonpaullevenson]

Same problem with missing an "else" clause

[IkonYTB]

5:44 line 51 shouldn't be an 'else' before 'sound=value'? Am I wrong or it assumes sound=value no matter what?

[victorcates]

Liked the video. However, are there cases where "new" is a good idea? Based on the example here, i'd assume people's takeaway would be to just go with virtual/override.