有关信息， INT ？ / 可空< T> 是不会引用类型;它只是一个空类型，意思是：一个结构（主要是和 INT 和布尔标记）具有特殊编译规则（重新null检查，运营商等）和CLI规则（装箱/拆箱）。有是的.NET中没有整数引用类型，除非你计数拳击：

For info, int? / Nullable<T> is not a reference-type; it is simply a "nullable type", meaning: a struct (essentially and int and a bool flag) with special compiler rules (re null checks, operators, etc) and CLI rules (for boxing/unboxing). There is no "integer reference-type" in .NET, unless you count boxing:

int i = 123;
object o = i; // box

但是这创造了一个不必要的对象，有很多相关的其他问题。

but this creates an unnecessary object and has lots of associated other issues.

有关你想要什么， INT？应该是理想的。您的可能的使用长手语法（可空< INT> ），但IMO这是不必要的冗长，我已经看到了蛊惑人心。

For what you want, int? should be ideal. You could use the long-hand syntax (Nullable<int>) but IMO this is unnecessarily verbose, and I've seen it confuse people.