该结构包括引用类型

Question

结构包含引用字段的方式是否正确？

喜欢下面的代码：

public class ClassA
{
   //...
}

public class ClassB
{
   //...
}

public struct StructAB
{
   public ClassA a;
   public ClassB b;

   public StructAB(ClassA ca,ClassB cb)
   {
      this.a = ca;
      this.b = cb;
   }
}

Answer 1

是的，你可以，代码将编译。但请记住，结构是值类型。每次将结构作为参数传递时，都会创建每个成员的 shallow 副本。如果您的结构包含引用类型，则只会复制引用（即指向成员的指针）。因此，除非有充分的理由让您在结构内部使用引用类型，否则请避免使用它。

Typically, you use structure types to design small data-centric types that provide little or no behavior. For example, .NET uses structure types to represent a number (both integer and real), a Boolean value, a Unicode character, a time instance. If you're focused on the behavior of a type, consider defining a class. Class types have reference semantics. That is, a variable of a class type contains a reference to an instance of the type, not the instance itself.

https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/builtin-types/struct#passing-structure-type-variables-by-reference

该结构包括引用类型

The structure includes reference types

c#

struct

reference

object