结构、接口和装箱 [英] Structs, Interfaces and Boxing

问题描述

可能的重复:
结构体实现接口是否安全?

拿这个代码:

interface ISomeInterface
{
    public int SomeProperty { get; }
}

struct SomeStruct : ISomeInterface
{
    int someValue;

    public int SomeProperty { get { return someValue; } }

    public SomeStruct(int value)
    {
        someValue = value;
    }
}

然后我在某处这样做:

ISomeInterface someVariable = new SomeStruct(2);

在这种情况下 SomeStruct 是否被装箱?

is the SomeStruct boxed in this case?

推荐答案

是的.基本上，每当您需要一个引用而您只有一个值类型值时，该值就会被装箱.

Yes, it is. Basically whenever you need a reference and you've only got a value type value, the value is boxed.

这里的ISomeInterface是一个接口，是一个引用类型.因此someVariable的值总是一个引用，所以新创建的struct值必须被装箱.

Here, ISomeInterface is an interface, which is a reference type. Therefore the value of someVariable is always a reference, so the newly created struct value has to be boxed.

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