RecordEnumerableEquality.Fody is a Fody add-in that enables deep equality comparison for C# records containing properties implementing IEnumerable<T>. This allows for comparison of records with collections in a straightforward and intuitive manner, ensuring that two records with the same collection elements are considered equal, even if the instances of the collections are different.

See also Fody usage.

Install the RecordEnumerableEquality.Fody NuGet package and update the Fody NuGet package:

PM> Install-Package Fody
PM> Install-Package RecordEnumerableEquality.Fody

The Install-Package Fody is required since NuGet always defaults to the oldest, and most buggy, version of any dependency.

Add <PropertyChanged/> to FodyWeavers.xml

<Weavers>
  <RecordEnumerableEquality/>
</Weavers>

To use RecordEnumerableEquality.Fody, simply define your records with properties that implement IEnumerable<T>, and the Fody add-in will handle the deep equality comparison and hashing for you.

Here is an example demonstrating the functionality:

var mc = new MainClass()
{
    Property1 = "Hello",
    SubClasses = new List<SubClass>()
    {
        new ()
        {
            Property2 = "Hello",
            Property3 = "World!"
        },
        new ()
        {
            Property2 = "Hello1",
            Property3 = "World2!"
        },
    }
};

var mc1 = new MainClass()
{
    Property1 = "Hello",
    SubClasses = new List<SubClass>()
    {
        new ()
        {
            Property2 = "Hello",
            Property3 = "World!"
        },
        new ()
        {
            Property2 = "Hello1",
            Property3 = "World2!"
        },
    }
};

Console.WriteLine($"Equals: {mc.Equals(mc1)}");

var hashCode = mc.GetHashCode();
var hashCode1 = mc1.GetHashCode();

Console.WriteLine($"HashCode1: {hashCode}");
Console.WriteLine($"HashCode2: {hashCode1}");
Console.WriteLine($"HashCode Equals: {hashCode == hashCode1}");

public record MainClass
{
    public string Property1 { get; set; }

    public List<SubClass> SubClasses { get; set; } = new List<SubClass>();
}

public record SubClass
{
    public string Property2 { get; set; }
    public string Property3 { get; set; }
}

Equals: True

HashCode1: 12345678
HashCode2: 12345678
HashCode Equals: True

Without the Add-in, the output would be not equal and the hash codes would be different.

Contributions are welcome! If you have any ideas, suggestions, or bug reports, please open an issue or submit a pull request.

1. Fork the repository.
2. Create a new feature branch.
3. Commit your changes.
4. Push the branch.
5. Open a pull request.

This project is licensed under the MIT License. See the LICENSE file for more details.

Special thanks to the Fody community for their support and contributions.