接口的通用类型约束?
我可以这样做:
void MyMethod<T>() where T : class { }
有这样的东西吗?
void MyMethod<T>() where T : interface { }
我不希望明确指定接口名称.
I'd prefer not to specify the interface name explicitly.
另一种选择是，我可以传入受class约束的参数，并在typeof(T).IsInterface返回false时引发异常，但这并不像约束那样干净.
The alternative is that I can pass in an argument that's constrained by class and throw an exception if typeof(T).IsInterface returns false, but that's not as clean as a constraint.
这没有任何意义，因为它不会导致任何限制.
This makes no sense since it doesn't leads to any limitations.
约束class表示类型参数必须是引用类型.
Constraint class means that the type argument must be a reference type.
那么没有显式接口名称的interface应该限制什么呢?
So what interface without explicit interface name should limit?
接口本身只是方法/属性的声明，因此约束条件某物是接口"的字面意思是某物具有某些声明"，这是没有用的.
Interface itself is just a declaration of methods/properties, so constraint "something is interface" literally mean "something has some declarations" - that is useless.