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c#.netvisual-studioclassoverriding

Why does this happen when we override the ToString() method in a class?

I created a Person class and overrode some properties and constructor method and override ToString() method.

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And I defined another class MyClass<T1> generically and created a field called a and the constructor method and the print method of field a.

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And inside the main method, I created a new object of the Person class called class1 and filled the properties related to the Person class and called the print method through the class1 object.

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And I am given the below output.

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Why did this happen?

I know it's because of overriding ToString() but I don't understand it. :(

Solution

  • .ToString() method is called by MyClass<T>.Print() when it is calling Console.WriteLine. You pass your Person into Console.WriteLine as parameter for a call to format and print string (do you see {0} placeholder in Console.WriteLine first argument?). Inside it calls string.Format to render the string and this is the place where your overriden ToString() implementation is called.

    You can set a breakpoint inside ToString() method, run the debugger and look through the callstack, to find actual callers of your method.