Finding out if a type implements a generic interface

by 
// this conditional is necessary if myType can be an interface,
// because an interface doesn't implement itself: for example,
// typeof (IList<int>).GetInterfaces () does not contain IList<int>!
if (myType.IsInterface && myType.IsGenericType && 
    myType.GetGenericTypeDefinition () == typeof (IList<>))
    return myType.GetGenericArguments ()[0] ;

foreach (var i in myType.GetInterfaces ())
    if (i.IsGenericType && i.GetGenericTypeDefinition () == typeof (IList<>))
        return i.GetGenericArguments ()[0] ;

Edit: Even if myType implements IDerivedFromList<> but not directly IList<>, IList<> will show up in the array returned by GetInterfaces().

Update: added a check for the edge case where myType is the generic interface in question.

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