📜  数据类型后的问号c#代码示例

📅  最后修改于: 2022-03-11 14:49:23.560000             🧑  作者: Mango

代码示例1
Nullable types support a value type that can be assigned a null reference.

Nullable types can represent all the values of an underlying type, 
and an additional null value. Nullable types are declared in one of two ways:

( System.Nullable variable )        or         ( T? variable  )