CA2220: Finalizers should call base class finalizer
Note
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| Item | Value |
|---|---|
| TypeName | FinalizersShouldCallBaseClassFinalizer |
| CheckId | CA2220 |
| Category | Microsoft.Usage |
| Breaking Change | Non Breaking |
Cause
A type that overrides System.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.
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