The Type.IsGenericTypeDefinition property is true.

Defines a generic type. A constructed type is created by calling the Type.MakeGenericType(Type[]) method on a Type object that represents a generic type definition and specifying an array of type arguments.

Type.MakeGenericType(Type[]) can be called only on generic type definitions.

Any generic type definition is a generic type (the Type.IsGenericType property is true), but the converse is not true.

The Type.IsGenericType property is true.

Can be a generic type definition, an open constructed type, or a closed constructed type.

Note that an array type whose element type is generic is not itself a generic type. The same is true of a Type object representing a pointer to a generic type.

The Type.ContainsGenericParameters property is true.

Examples are a generic type that has unassigned type parameters, a type that is nested in a generic type definition or in an open constructed type, or a generic type that has a type argument for which the Type.ContainsGenericParameters property is true.

It is not possible to create an instance of an open constructed type.

Note that not all open constructed types are generic. For example, an array whose element type is a generic type definition is not generic, and a pointer to an open constructed type is not generic.

The Type.ContainsGenericParameters property is false.

When examined recursively, the type has no unassigned generic parameters.

The Type.IsGenericParameter property is true.

The Type.ContainsGenericParameters property is true.

In a generic type definition, a placeholder for a type that will be assigned later.

Can be any type, including a generic type parameter.

Type arguments are specified as an array of Type objects passed to the Type.MakeGenericType(Type[]) method when creating a constructed generic type. If instances of the resulting type are to be created, the Type.ContainsGenericParameters property must be false for all the type arguments.

Derived(Of V)

Derived<V>

For this type:

Type.IsGenericType is true.

Type.IsGenericTypeDefinition is true.

Type.ContainsGenericParameters is true.

Base(Of String, V)

Base<String,V>

Base<String^,V>

For this type:

Type.IsGenericType is true.

Type.IsGenericTypeDefinition is false.

Type.ContainsGenericParameters is true.

Dim d() As Derived(Of Integer)

Derived<int>[] d;

array<Derived<int>^>^ d;

For the type of variable d:

Type.IsGenericType is false because d is an array.

Type.IsGenericTypeDefinition is false.

Type.ContainsGenericParameters is false.

Type.IsGenericParameter is true.

Type.IsGenericType is false because there is no way to constrain a type parameter to generic types.

Type.IsGenericTypeDefinition is false.

Type.ContainsGenericParameters is true because T, U, and V are themselves generic type parameters. This does not imply anything about type arguments that are assigned to them later.

Type.IsGenericType is true.

Type.IsGenericTypeDefinition is false because a type has been assigned to to the type parameter of G. Note that this is equivalent to having called the Type.MakeGenericType(Type[]) method.

Type.ContainsGenericParameters is true because the type of field F has a type argument that is an open constructed type. The constructed type is open because its type argument (that is, Base) is a generic type definition. This illustrates the recursive nature of the Type.IsGenericType property.

Type.IsGenericType is true, even though the Nested class has no generic type parameters of its own, because it is nested in a generic type.

Type.IsGenericTypeDefinition is true. That is, you can call the Type.MakeGenericType(Type[]) method and supply the type parameter of the enclosing type, Derived.

Type.ContainsGenericParameters is true because the enclosing type, Derived, has generic type parameters. This illustrates the recursive nature of the Type.ContainsGenericParameters property.