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Editorial Team
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Asked: 2026-06-15T00:35:23+00:00

Here’s my problem: I am using a DLL library (not from the .NET framework)

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Here’s my problem:

I am using a DLL library (not from the .NET framework) which contains a System namespace with the Tuple and Lazy classes.

When I try to compile my project the compiler throws some errors stating that these classes exist in mscorlib.dll and another DLL.

So, how can I use the classes from the .NET Framework and don’t delete the reference to the other DLL?

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1 Answer

  1. Editorial Team

    If they have the same namespace etc, then the only way to disambiguate is to use an extern alias. In the solution explorer, change the Aliases property of this rogue reference to something else, for example foo (instead of global).

    Now, in the class files where you need types from that assembly, you’ll have to add (at the very top):

    extern alias foo;

    And then later down in the code you can use:

    foo::Some.Namespace.TheType

    or equally:

    foo.Some.Namespace.TheType

    Basically, the alias name becomes an extra level of disambiguation. The default alias, for reference, is global. Note also, however, that while the compiler is fine with this, the VS2012 IDE still has a few… kinks with extern alias: https://connect.microsoft.com/VisualStudio/feedback/details/770464/ide-but-not-compiler-incorrectly-reports-an-error-when-using-extern-alias-to-disambiguate-types

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