C constructors overloading

Question

How I can use constructors in C  like this   public Point2D double x  double y               Contracts          X   x      Y   y     public Point2D Point2D point        if  point    null          ArgumentNullException  point        Contract EndContractsBlock         this point X  point Y       I need it to not copy code from another constructor

User · Answer

public Point2D Point2D point    this point X  point Y

User · Answer

You can factor out your common logic to a private method  for example called Initialize that gets called from both constructors   Due to the fact that you want to perform argument validation you cannot resort to constructor chaining   Example   public Point2D double x  double y           Contracts      Initialize x  y      public Point2D Point2D point        if  point    null          throw new ArgumentNullException  point            Contracts      Initialize point X  point Y      private void Initialize double x  double y        X   x      Y   y

User · Answer

Maybe your class isn t quite complete  Personally  I use a private init   function with all of my overloaded constructors   class Point2D      double X  Y     public Point2D double x  double y        init x  y          public Point2D Point2D point        if  point    null        throw new ArgumentNullException  point        init point X  point Y          void init double x  double y               Contracts         X   x      Y   y

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