ObjectDelta 2.1.0

ObjectDelta

A libary that creates a delta of two object instances.

The library is inspired by a blog post of Daniel Wertheim about producing a delta of two objects of the same type using the library Structurizer. Unfortunately Structurizer will not provide index information for properties with a null value, the property of a collection and for null collection items. This information is needed to be able to record object changes from null to a value and vice versa. I decided to create a library based on Structurizer that fits my needs for the delta creation.

Usage

Customer first = new Customer
{
	FirstName = "Sherlock",
	LastName = "Olmes",
	Address = new Address
	{
		Street = "Baker Street",
		Number = "900",
		Zip = "NW1",
		City = "London",
		Country = "England"
	},
	Tags = new string[] { "detective", "smart" }
};

Customer second = new Customer
{
	FirstName = "Sherlock",
	LastName = "Holmes",
	Address = new Address
	{
		Street = "Baker Street",
		Number = "221b",
		Zip = "NW1",
		City = "London",
		Country = "England"
	},
	Tags = new string[] { "detective", "smart", "addict" }
};

ObjectDelta<Customer> result = ObjectComparer.Compare(first, second);

The resulting ObjectDelta<Customer> provides a flat list containing the deltas for every property, inclusing nested properties of complex types (like the Address) and colleection items.

The output of ToString() of the result of operation above:

LastName (Olmes => Holmes)
Address (ConsoleApp1.Address => ConsoleApp1.Address)
Address.Number (900 => 221b)
Tags (System.String[] => System.String[])
Tags[1] (addict => genius)

References

Daniel Wertheim

• Structurizer
• How to build a simple object graph delta comparer in C# using Structurizer