// Implement copying fields in a private non-virtual method, called from more than one place.
private void copyFrom(Derived2 other) // Other could be null, so check for nullness.
{
if (other != null)
{
this.DoubleValue = other.DoubleValue;
}
}
// Protected copy constructor. Used to implement Clone().
// Also called by a derived class' copy constructor.
protected Derived2(Derived2 other) : base(other)
{
// Canonical implementation: use ":base(other)" to copy all
// the base fields (which recursively applies all the way to the ultimate base)
// and then explicitly copy any of this class' fields here:
this.copyFrom(other);
}
static Derived2 Clone(AbstractBase item)
{
AbstractBase abstractBase = (AbstractBase)item.Clone();
Derived2 result = abstractBase as Derived2;
Debug.Assert(result != null);
return(result);
}
static void Main()
{
Derived2 test = new Derived2()
{
IntValue = 1,
StringValue = "s",
DoubleValue = 2,
ShortValue = 3
};
Derived2 copy = Clone(test);
Console.WriteLine(copy);
}
// Equality check.
public override bool Equals(object obj)
{
if (object.ReferenceEquals(this, obj))
{
return(true);
}
if (!base.Equals(obj))
{
return(false);
}
Derived2 other = (Derived2)obj; // This must succeed because if the types are different, base.Equals() returns false.
return(this.DoubleValue == other.DoubleValue);
}
