need a specific output in my programm that in C#

Question

1.00/5 (4 votes)

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C#

namespace ConsoleApplication1
{

   public class A
    {
       public void Methodtoimp()
        {
           // Console.WriteLine("A class call");//what the code
          //  Console.WriteLine("B class call");// have to write here??
        }                                               
    }

  public class B:A
    {
        static void Main(string[] args)
        {

            A obj1=new A();
            obj1.Methodtoimp();
            B obj2=new B ();
            obj2.Methodtoimp();

            Console.Read();
        }
    }
}

what the code write above so that when i call the A object the my output must be"A class call" and for B obj2 call output should be "B class call"

Thank you
Sachin

Posted 27-Jul-12 9:47am

chinta123

Updated 27-Jul-12 9:54am

lewax00

v2

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2 solutions

Solution 1

You need to define Methodtoimp in class B as well as class A, then just include the appropriate WriteLine statement in each class's implementation.

Posted 27-Jul-12 9:59am

lewax00

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Sergey Alexandrovich Kryukov · Accepted Answer · 2012-07-27T10:00:00

You need to use this.GetType().Name to obtain the run-time type of the instance used for a call and get its simple (not fully-qualified) name. So, it will be:

C#

Console.WriteLine(string.Format("The run-time type of the calling instance is {0}", this.GetType().Name));
// I don't want to use your incorrect "class call"
// ".this" can be omitted

// or, equivalent simpler form of WriteLine:
Console.WriteLine("The run-time type of the calling instance is {0}", this.GetType().Name);

It's important to understand that you use instance (non-static) methods. These method has additional (hidden, implicit) parameter called "this", used to carry the instance passed as specified by your variable name on the left part of '.' (dot) in obj1.Methodtoimp(); or obj2.Methodtoimp(); that is, obj1, obj2 or the like.

(Simplified form of System.Console.WriteLine without using string.Format is possible because of this overload: http://msdn.microsoft.com/en-us/library/828t9b9h.aspx[^].)

I would also want to warn you that using the type object, type name or something like this to define logic of your code would be the big abuse defeating the purpose of OOP. With OOP, you should use late binding based on virtual and overridden methods and/or interfaces. Well, so far, you are not doing anything bad…

—SA