Methods with classname as a return type

Question

I\'m new in c# or any type of programming language. When I see codes in c# I found there are lot of confusions are over here. one of them I want to clarify from here. Methods co

Answer 1

So if we have a class Triangle and a method GetTriangle which has the parameter isBlue.

public class Triangle
{
    public string Colour { get; set; }
}

public Triangle GetTriangle(bool isBlue)
{
    Triangle resultTriangle;

    if (isBlue)
    {
        resultTriangle = new Triangle { Colour = "Blue" };
    }
    else
    {
        resultTriangle = new Triangle { Colour = "Red" };
    }

    return resultTriangle;
}

We can call GetTriangle with an argument of true or false like so:

Triangle blueTriangle = GetTriangle(true);

Triangle redTriangle = GetTriangle(false);

Both of the results of GetTriangle are Triangles, even though they contain different data (in this case a different Colour).

Like a child's wood-block toy, the compiler checks what the "shape" of the data is, not what colour it is. So if you try to return a Square from a method which returns Triangle then the compiler will throw an error in the same way you wouldn't be able to put a square block in a triangle hole.