Moq - Using VerifySet to check number of times called

I am trying to use VerifySet with Moq to check the number of times a setter on a collaborating Object i开发者_如何转开发s being called. But when I put in the Times portion of the call I get an error that the assignment operator is not valid in an expression tree.

mockTimer.VerifySet(timer => timer.Prop = value); //Works fine
mockTimer.VerifySet(timer => timer.Prop = value, Times.Once); //Compile Error

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You need to call the function Times.Once():

mockTimer.VerifySet(timer => timer.Prop = value, Times.Once());