Setting up a base entity class

In this recipe, we'll show how to set up a base class for your entities. The purpose of this class is to provide base implementations of potentially tricky Equals and GetHashCode methods.

How to do it…

1. We create a base class, where the type of Id is specified using a generic argument, as shown:

   public abstract class Entity<TId>
   {
   
     public virtual TId Id { get; protected set; }
   
     public override bool Equals(object obj)
     {
       return Equals(obj as Entity<TId>);
     }
   
     private static bool IsTransient(Entity<TId> obj)
     {
       return obj != null &&
              Equals(obj.Id, default(TId));
     }
   
     private Type GetUnproxiedType()
     {
       return GetType();
     }
   
     public virtual bool Equals(Entity<TId> other)
     {
       if (other == null)
         return false;
   
       if (ReferenceEquals(this, other))
         return true;
   
       if (!IsTransient(this) &&
           !IsTransient(other) &&
           Equals(Id, other.Id))
       {
         var otherType...