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Finalizers should call base class finalizer

TypeName

FinalizersShouldCallBaseClassFinalizer

CheckId

CA2220

Category

Microsoft.Usage

Breaking Change

Non Breaking

A type that overrides Object.Finalize does not call the Finalize method in its base class.

Finalization must be propagated through the inheritance hierarchy. To ensure this, types must call their base class Finalize method from within their own Finalize method. The C# compiler adds the call to the base class finalizer automatically.

To fix a violation of this rule, call the base type's Finalize method from your Finalize method.

Do not suppress a warning from this rule. Some compilers that target the common language runtime insert a call to the base type's finalizer into the Microsoft intermediate language (MSIL). If a warning from this rule is reported, your compiler does not insert the call, and you must add it to your code.

The following Visual Basic example shows a type TypeB that correctly calls the Finalize method in its base class.

Imports System

Namespace UsageLibrary

  Public Class TypeB
      Inherits TypeA

      Protected Overrides Sub Finalize()
          Try
              Dispose(False)
          Finally 
              MyBase.Finalize()
          End Try 
      End Sub 

  End Class 

End Namespace

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