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
using System.ComponentModel.Composition;
[PartCreationPolicy(CreationPolicy.Any)] // Noncompliant
public class FooBar : IFooBar { }
Compliant solution
using System.ComponentModel.Composition;
[Export(typeof(IFooBar))]
[PartCreationPolicy(CreationPolicy.Any)]
public class FooBar : IFooBar { }
Resources
Documentation
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