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CA1000: Do not declare static members on generic types

TypeName

DoNotDeclareStaticMembersOnGenericTypes

CheckId

CA1000

Category

Microsoft.Design

Breaking Change

Breaking

An externally visible generic type contains a static (Shared in Visual Basic) member.

When a static member of a generic type is called, the type argument must be specified for the type. When a generic instance member that does not support inference is called, the type argument must be specified for the member. The syntax for specifying the type argument in these two cases is different and easily confused, as the following calls demonstrate:

// Static method in a generic type.
GenericType<int>.StaticMethod();

// Generic instance method that does not support inference.
someObject.GenericMethod<int>();

Generally, both of the prior declarations should be avoided so that the type argument does not have to be specified when the member is called. This results in a syntax for calling members in generics that is no different from the syntax for non-generics. For more information, see CA1004: Generic methods should provide type parameter.

To fix a violation of this rule, remove the static member or change it to an instance member.

Do not suppress a warning from this rule. Providing generics in a syntax that is easy to understand and use reduces the time that is required to learn and increases the adoption rate of new libraries.

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