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I'm reading a book "C# in depth" by Jon Skeet and there is a part that confuses me:

Methods and nested types can be generic, but all of the following have to be nongeneric:

  • Fields
  • Properties
  • Indexers
  • Constructors
  • Events
  • Finalizers

I tested and fields (a variable in a class) can be generic, am I not understanding? It makes me doubt about the others.

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Classes and methods can introduce a new generic type parameter, the others in that list can be defined based on that type parameter, but cannot introduce a new one.

This is all fine;

class ClassName<T>{ private T FieldName; private T PropertyName { get; set; } private R GenericMethod<R>(T t, R r) { ... } }

But not;

class ClassName{ private T FieldName<T>; }
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Thanks, now I understand why it said: "For type members, it’s slightly more confusing; some members may look like they’re generic because they use other generic types. Remember that a declaration is generic only if it introduces new type parameters."

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