Adapter

// Adapter pattern -- Real World example

using System; namespace DoFactory.GangOfFour.Adapter.RealWorld {    // MainApp test application    class MainApp   {      static void Main()     {        // Non-adapted chemical compound       Compound stuff = new Compound("Unknown");       stuff.Display();               // Adapted chemical compounds       Compound water = new RichCompound("Water");       water.Display();       Compound benzene = new RichCompound("Benzene");       benzene.Display();       Compound alcohol = new RichCompound("Alcohol");       alcohol.Display();        // Wait for user       Console.Read();     }   }    // "Target"    class Compound   {      protected string name;      protected float boilingPoint;      protected float meltingPoint;      protected double molecularWeight;      protected string molecularFormula;      // Constructor      public Compound( string name)     {        this.name = name;     }      public virtual void Display()     {       Console.WriteLine("\nCompound: {0} ------ ", name);     }   }    // "Adapter"    class RichCompound : Compound   {      private ChemicalDatabank bank;      // Constructor      public RichCompound( string name) : base(name)     {     }      public override void Display()     {        // Adaptee       bank = new ChemicalDatabank();       boilingPoint = bank.GetCriticalPoint(name, "B");       meltingPoint = bank.GetCriticalPoint(name, "M");       molecularWeight = bank.GetMolecularWeight(name);       molecularFormula = bank.GetMolecularStructure(name);        base.Display();       Console.WriteLine(" Formula: {0}", molecularFormula);       Console.WriteLine(" Weight : {0}", molecularWeight);       Console.WriteLine(" Melting Pt: {0}", meltingPoint);       Console.WriteLine(" Boiling Pt: {0}", boilingPoint);     }   }    // "Adaptee"    class ChemicalDatabank   {      // The Databank 'legacy API'      public float GetCriticalPoint( string compound, string point)     {        float temperature = 0.0F;        // Melting Point        if (point == "M")       {          switch (compound.ToLower())         {            case "water" : temperature = 0.0F; break;            case "benzene" : temperature = 5.5F; break;            case "alcohol" : temperature = -114.1F; break;         }       }        // Boiling Point        else       {          switch (compound.ToLower())         {            case "water" : temperature = 100.0F; break;            case "benzene" : temperature = 80.1F; break;            case "alcohol" : temperature = 78.3F; break;         }       }        return temperature;     }      public string GetMolecularStructure( string compound)     {        string structure = "";        switch (compound.ToLower())       {          case "water" : structure = "H20"; break;          case "benzene" : structure = "C6H6"; break;          case "alcohol" : structure = "C2H6O2"; break;       }        return structure;     }      public double GetMolecularWeight( string compound)     {        double weight = 0.0;        switch (compound.ToLower())       {          case "water" : weight = 18.015; break;          case "benzene" : weight = 78.1134; break;          case "alcohol" : weight = 46.0688; break;       }        return weight;     }   } }