C# if with obj params

object obj = new Person
{
    FirstName = "Kathleen",
    LastName = "Dollard",
    Address = new Address { City = "Seattle" }
};

if (obj is Person { Address: { City: "Seattle" } })
    Console.WriteLine("Seattle");

if (obj is Person { Address.City: "Seattle" }) // Extended property pattern
    Console.WriteLine("Seattle");

Source: devblogs.microsoft.com

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