C # Inheritance

classa{ PublicA () {printfields (); }     Public Virtual voidPrintfields () {}}classb:a{intx =1; inty;  PublicB () {y= -1; }     Public Override voidPrintfields () {Console.WriteLine ("X={0},y={1}", x, y); }}

b b = new B ();
The output is: x=1,y=0

When a B object is instantiated, the parameterless constructor of Class A is automatically called, that is, the Printfields () method is output (because the global variable defaults to 0), and then the parameterless function of B is called, and B () is only assigned a value of-1 for Y, and no output is made

If B b=new b (); B.printfields (); Then the output is x=1,y=-1.

C # Inheritance