Nested types in generic classes
A generic class declaration can contain nested type declarations. The type parameters of the enclosing class can be used within the nested types. A nested type declaration can contain additional type parameters that apply only to the nested type. Every type declaration contained within a generic class declaration is implicitly a generic type declaration. When writing a reference to a type nested within a generic type, the containing constructed type, including its type arguments, must be named. However, from within the outer class, the nested type can be used without qualification; the instance type of the outer class can be implicitly used when constructing the nested type. The following example shows three different correct ways to refer to a constructed type created from Inner; the first two are equivalent: class Outer<T> static void F(T t) { Outer<int>.Inner<string>.F(3, "abc"); // This type is different Outer.Inner<string>.F(t, "abc"); // Error, Outer needs type arg Although it is bad programming style, a type parameter in a nested type can hide a member or type parameter declared in the outer type: class Outer<T>
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