CA1411: COM registration methods should not be visible

 

For the latest documentation on Visual Studio 2017 RC, see Visual Studio 2017 RC Documentation.

TypeNameComRegistrationMethodsShouldNotBeVisible
CheckIdCA1411
CategoryMicrosoft.Interoperability
Breaking ChangeBreaking

A method that is marked with the System.Runtime.InteropServices.ComRegisterFunctionAttribute or the System.Runtime.InteropServices.ComUnregisterFunctionAttribute attribute is externally visible.

When an assembly is registered with Component Object Model (COM), entries are added to the registry for each COM-visible type in the assembly. Methods that are marked with the ComRegisterFunctionAttribute and ComUnregisterFunctionAttribute attributes are called during the registration and unregistration processes, respectively, to run user code that is specific to the registration/unregistration of these types. This code should not be called outside these processes.

To fix a violation of this rule, change the accessibility of the method to private or internal (Friend in Visual Basic).

Do not suppress a warning from this rule.

The following example shows two methods that violate the rule.

Imports System
Imports System.Runtime.InteropServices

<Assembly: ComVisibleAttribute(True)>
Namespace InteroperabilityLibrary

   Public Class ClassToRegister
   End Class

   Public Class ComRegistration

      <ComRegisterFunctionAttribute> _ 
      Public Shared Sub RegisterFunction(typeToRegister As Type)
      End Sub

      <ComUnregisterFunctionAttribute> _ 
      Public Shared Sub UnregisterFunction(typeToRegister As Type)
      End Sub

   End Class

End Namespace

CA1410: COM registration methods should be matched

System.Runtime.InteropServices.RegistrationServices
Registering Assemblies with COM
Regasm.exe (Assembly Registration Tool)

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