Extending sealed intrinsic datatypes using CompilerServices.Extensions-No way to reuse?

I defined the following extension of the Date? data type

'Nullable Date Extensions
<System.Runtime.CompilerServices.Extension()> _
Public Function ToObject(ByVal thisInstance As Date?) As Object
    Return If(thisInstance.HasValue, CType(thisInstance, Object), DBNull.Value)
End Function

Which gave me the terse capability to do this:

Public Property MyDateTime() As Date?

rowTest.Item("MyDate") = Me.MyDate.ToObject

But when I moved my compiler definition to a separate DLL, I the ToObject method was no longer av开发者_运维问答ailable from my project even though I had referenced the Class project which now contained the extension.

Is this a limitation of the Compiler Extensions? HOw do you get reusability out of them?

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You'll need to include the .ToObject namespace (the namespace containing your Nullable date extensions) in your target file in the other project.