/// <summary>
/// Return the difference (changes, additions, but not removals) of
/// property values between the supplied argument and the values
/// contained in the collection.
/// </summary>
/// <param name="old">Another property values collection.</param>
/// <returns>
/// The collection of property values that are different than the supplied one.
/// </returns>
public IPropertyValues ChangesSince(IPropertyValues old)
{
MutablePropertyValues changes = new MutablePropertyValues();
if (old == this)
{
return(changes);
}
// for each property value in this (the newer set)
foreach (PropertyValue newProperty in propertyValuesList)
{
PropertyValue oldProperty = old.GetPropertyValue(newProperty.Name);
if (oldProperty == null)
{
// if there wasn't an old one, add it
changes.Add(newProperty);
}
else if (!oldProperty.Equals(newProperty))
{
// it's changed
changes.Add(newProperty);
}
}
return(changes);
}
public void TestEquals()
{
PropertyValue one = new PropertyValue("Age", 12);
PropertyValue two = new PropertyValue("Age", 12);
Assert.AreEqual(one, two);
Assert.AreEqual(one.GetHashCode(), two.GetHashCode());
Assert.AreEqual(one, one);
Assert.IsFalse(one.Equals("Foo"));
}