README.md

EntityChange

Library to compare two entity object graphs detecting changes

Download

The EntityChange library is available on nuget.org via package name EntityChange.

To install EntityChange, run the following command in the Package Manager Console

PM> Install-Package EntityChange

More information about NuGet package available at https://nuget.org/packages/EntityChange

Features

• Compare complete entity graph including child entities, collections and dictionaries
• Collection compare by index or element equality
• Dictionary compare by key
• Custom value string formatter
• Custom entity equality compare
• Markdown or Html change report formatter

Configuration

Configure the Contact properties and collections.

EntityChange.Configuration.Default.Configure(config => config
    .Entity<Contact>(e =>
    {
        // set the FirstName display name
        e.Property(p => p.FirstName).Display("First Name");
        // compare the Roles collection by string equality
        e.Collection(p => p.Roles)
            .CollectionComparison(CollectionComparison.ObjectEquality)
            .ElementEquality(StringEquality.OrdinalIgnoreCase);
        // set how to format the EmailAddress entity as a string
        e.Collection(p => p.EmailAddresses).ElementFormatter(v =>
        {
            var address = v as EmailAddress;
            return address?.Address;
        });
    })
    .Entity<EmailAddress>(e =>
    {
        e.Property(p => p.Address).Display("Email Address");
    })
);

Comparison

Compare to Contact entities

// create comparer using default configuration
var comparer = new EntityComparer();

// compare original and current instances generating change list 
var changes = comparer.Compare(original, current).ToList();

Change Report

Sample output from the MarkdownFormatter

OUTPUT

• Removed Administrator from Roles
• Changed Email Address from [email protected] to [email protected]
• Added [email protected] to Email Addresses
• Changed Status from New to Verified
• Changed Updated from 5/17/2016 8:51:59 PM to 5/17/2016 8:52:00 PM
• Changed Zip from 10026 to 10027
• Changed Number from 888-555-1212 to 800-555-1212
• Added Blah to Categories
• Changed Data from 1 to 2
• Changed Data from ./home to ./path