Why is this an issue?
To customize the default behavior for an export in the Managed Extensibility
Framework (MEF), applying the PartCreationPolicyAttribute
is necessary. For the PartCreationPolicyAttribute
to be meaningful in the context of an export, it is required to also annotate the class with the ExportAttribute.
This rule raises an issue when a class is annotated with the PartCreationPolicyAttribute but not with the
ExportAttribute.
How to fix it
Code examples
Noncompliant code example
Imports System.ComponentModel.Composition
<PartCreationPolicy(CreationPolicy.Any)> ' Noncompliant
Public Class FooBar
Inherits IFooBar
End Class
Compliant solution
Imports System.ComponentModel.Composition
<Export(GetType(IFooBar))>
<PartCreationPolicy(CreationPolicy.Any)>
Public Class FooBar
Inherits IFooBar
End Class
Resources
Documentation
Articles & blog posts
