Moq.Times 参数默认值？ 如何创建结构常量，bc Moq.Times.Once() 不是编译时常量

Question

I have a parameter that is of type Moq.Times and I want it to have a default value of Moq.Times.Once() except Once() is a method and not a compile time constant.

So I set made the parameter nullable and set the default value to null and then in the method, if the param value is null, I set it to / invoke Moq.Times.Once() and that's fine, but what I'd really like to do is have a default value of Moq.Times.Once()

Is there a more clever / simpler way to do this?

What I want but doesn't compile:

void MyMethod(Moq.Times invocationTimes = Moq.Time.Once()) { ... }

What I do instead:

void MyMethod(Moq.Times? invocationTimes = null) { if (invocationTimes == null) { invocationTimes = Times.Once(); }}

Answer 1

Yes, you should allow null and then replace that at runtime.

You can make your code a bit more concise with the null coalescing operator since C# 8 :

void MyMethod(Moq.Times? invocationTimes = null) 
{ 
    invocationTimes ??= Times.Once(); 
    ...
}