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Why aren’t reference types polymorphic?

April 26, 2017polymorphic Reference types

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Why aren’t reference types polymorphic?

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using System; class Dog { public string Name; } class Test { public static void Swap(ref object a, ref object b) { object temp; temp = a; a = b; b = temp; } public static void Main() { Dog d1 = new Dog(); d1.Name = “fido”; Dog d2 = new Dog(); d2.Name = “rex”; Swap(ref d1, ref d2); } }