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    <p>There are two interpretations of your question; one would be trivial, one impossible, so I'll go forward and cover both.</p> <ol> <li><p>You want to return an instance of a type which implements both <a href="http://msdn.microsoft.com/en-us/library/system.type.aspx" rel="nofollow noreferrer"><code>System.Type</code></a> and <code>TInterface</code>.</p> <p>This is trivial: Just use <code>where TType : Type</code> and <code>where TType : TInterface</code>.</p></li> <li><p>You want to return an instance of <a href="http://msdn.microsoft.com/en-us/library/system.type.aspx" rel="nofollow noreferrer"><code>System.Type</code></a> that represents a type which inherits from <code>TInterface</code>.</p> <p>This is impossible to specify in the .NET (and C#) type-system.</p> <p>The type system can only resolve information from the type hierarchy themselves, but not enforce "contracts" like restricted run-time property values. There are a few hacks regarding default-constructors etc., but as far as I know not even testing for existing methods is possible (unlike C++ templates, for instance, not to speak of Qi et al.).</p></li> </ol> <p><em>Update</em></p> <p>Please check the comment from <a href="https://stackoverflow.com/users/1301879/michael-graczyk">Michael Graczyk</a>.</p> <p>Also: I just found out that there are code-contract checkers (static and run-time) for .NET: <a href="http://msdn.microsoft.com/en-us/devlabs/dd491992.aspx" rel="nofollow noreferrer">Microsoft DevLabs Code-Contracts for .NET</a>. I have never used them, not even new about them, but that looks interesting!</p> <p>However, even without looking, I'm quite sure that overload-resolution etc. will not be able to use such information.</p>
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    1. POHow to create a generic interface of a method that returns a Type of a class that implements an interface?
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    1. CO3. He is using the word "Type" for something other than `System.Type`.
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    2. COYou are so goddamn right about this. Ouch. For other readers: falls into class 2.) checking property-values won't work.
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    3. COFor #1, I'd simplify it as where TType : Type, TInterface
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