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enum System.Reflection.GenericParameterAttributes

Assembly: System.Runtime

Describes the constraints on a generic type parameter of a generic type or method.

Values

None

There are no special flags.

Covariant

The generic type parameter is covariant. A covariant type parameter can appear as the result type of a method, the type of a read-only field, a declared base type, or an implemented interface.

Contravariant

The generic type parameter is contravariant. A contravariant type parameter can appear as a parameter type in method signatures.

VarianceMask

Selects the combination of all variance flags. This value is the result of using logical OR to combine the following flags: <see cref="F:System.Reflection.GenericParameterAttributes.Contravariant" /> and <see cref="F:System.Reflection.GenericParameterAttributes.Covariant" /> .

ReferenceTypeConstraint

A type can be substituted for the generic type parameter only if it is a reference type.

NotNullableValueTypeConstraint

A type can be substituted for the generic type parameter only if it is a value type and is not nullable.

DefaultConstructorConstraint

A type can be substituted for the generic type parameter only if it has a parameterless constructor.

SpecialConstraintMask

Selects the combination of all special constraint flags. This value is the result of using logical OR to combine the following flags: <see cref="F:System.Reflection.GenericParameterAttributes.DefaultConstructorConstraint" /> , <see cref="F:System.Reflection.GenericParameterAttributes.ReferenceTypeConstraint" /> , and <see cref="F:System.Reflection.GenericParameterAttributes.NotNullableValueTypeConstraint" /> .

AllowByRefLike

The generic type parameter can be <c>ByRefLike</c> .