Strawberry check

Guard clauses implementation for .NET.

Currently, the library contain a few the most common simple checks.

• Check.NotNull(o, nameof(o)) Throws ArgumentNullException
• Check.NotNullOrEmpty(o, nameof(o)) Thrown ArgumentNullException when o is null, otherwise ArgumentException if o is empty
• Check.NotNullOrWhiteSpace(o, nameof(o)) Thrown ArgumentNullException when o is null, otherwise ArgumentException if o contains only white spaces

But, let's take a little bit complicated example.

private class Person
{
    public string Name { get; init; }
    public Pet Pet { get; init; }
    public Person BestFriend { get; set; }
}

private class Pet
{
    public string Name { get; init; }
}

How can we guard that the name of person and his/her pet's name are filled in?

var john = new Person
{
    Name = "John",
    Pet = new Pet {Name = "Max"}
};

Check.Object(john, nameof(john))
    .NotNullOrWhiteSpaces(o => o.Name)
    .InnerObject(o => o.Pet, pet => pet
        .NotNullOrWhiteSpaces(o => o.Name))
    .Verify();