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CA2220: Finalizers should call base class finalizer

Visual Studio 2010

TypeName	FinalizersShouldCallBaseClassFinalizer
CheckId	CA2220
Category	Microsoft.Usage
Breaking Change	Non Breaking

Cause

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

Rule Description

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.

How to Fix Violations

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

When to Suppress Warnings

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.

Example

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

Copy


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

Reference

Implementing Finalize and Dispose to Clean Up Unmanaged Resources

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