Generic method for IComparable : IComparable : Data Structure C# Examples

    
using  System;  
  
class  MyClass  :  IComparable  {  
    public  int  val;  
  
    public  MyClass(int  x)  {  val  =  x;  }  
  
    //  Implement  IComparable.  
    public  int  CompareTo(object  obj)  {  
        return  val  -  ((MyClass)  obj).val;  
    }  
}  
  
class  MainClass  {  
    public  static  bool  isIn<T>(T  what,  T[]  obs)  where  T  :  IComparable  {  
        foreach(T  v  in  obs)  
            if(v.CompareTo(what)  ==  0)  //  now  OK,  uses  CompareTo()  
                return  true;  
  
        return  false;  
    }  
  
    public  static  void  Main()  {  
        //  Use  isIn()  with  int.  
        int[]  nums  =  {  1,  2,  3,  4,  5  };  
  
        if(isIn(2,  nums))  
            Console.WriteLine("2  is  found.");  
  
        //  Use  isIn()  with  string.  
        string[]  strs  =  {  "one",  "two",  "Three"};  
  
        if(isIn("two",  strs))  
            Console.WriteLine("two  is  found.");  
  
        //  Use  isIn  with  MyClass.  
        MyClass[]  mcs  =  {  new  MyClass(1),  new  MyClass(2),  
                                            new  MyClass(3),  new  MyClass(4)  };  
  
        if(isIn(new  MyClass(3),  mcs))  
            Console.WriteLine("MyClass(3)  is  found.");  
  
        if(isIn(new  MyClass(99),  mcs))  
            Console.WriteLine("This  won't  display.");  
    }  
}