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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace IntfAsMethodParam { class Program { static void Main(string[] args) { Shape[] shapes = { new Triangle("Triangle"), new Circle("Circle") }; foreach (var shape in shapes) { if (shape is IDraw3D) { SomeMethod((IDraw3D)shape); } // <<< applying method } } static void SomeMethod(IDraw3D itf3d) // <<< IDraw3D interface as param { Console.WriteLine("3d drawing "); itf3d.Draw3D(); } // base class public class Shape { public string Name { get; set; } public Shape(string name) { Name = name; } public Shape() { } public virtual void Draw() { } } // Circle - derived from shape and NOT implementing IPointy public class Circle : Shape,IDraw3D { public Circle() { } public Circle(string name) : base(name) { } public override void Draw() { Console.WriteLine("Shape name is {0}", this.Name); } public void Draw3D() { Console.WriteLine("3D Drawing Shape name is {0}", this.Name); } } // Triangle - derived from shape and implementing IPointy public class Triangle : Shape, IPointy { public Triangle() { } public Triangle(string name) : base(name) { } public override void Draw() { Console.WriteLine("Shape name is {0}", this.Name); } public byte Points { get { return 3; } } } //declaring interface public interface IDraw3D { void Draw3D(); } //declaring interface public interface IPointy { byte Points { get; } } } } |