自动性能和结构 [英] Auto-properties and structs

问题描述

我想了解一下下面的C＃ - code：

I am wondering about the following C#-code:

struct Structure
{
    public Structure(int a, int b)
    {
        PropertyA = a;
        PropertyB = b;
    }
    public int PropertyA { get; set; }
    public int PropertyB { get; set; }
}

这是不是一个错误编译在'这个'对象不能使用之前所有字段被分配到。对于类似的类被编译没有任何问题。

It is not compiling with an error "The 'this' object cannot be used before all of its fields are assigned to". For the analogous class it is compiling without any problems.

这可通过重构以下工作：

It can be made working by refactoring to the following:

struct Structure
{
    private int _propertyA;
    private int _propertyB;

    public Structure(int a, int b)
    {
        _propertyA = a;
        _propertyB = b;
    }

    public int PropertyA
    {
        get { return _propertyA; }
        set { _propertyA = value; }
    }

    public int PropertyB
    {
        get { return _propertyB; }
        set { _propertyB = value; }
    }
}

不过，我虽然，引入自动性能到C＃的整点是为了避免以后写code。这是否意味着自动特性是不相关的结构？

But, I though that the whole point of introducing auto-properties to the C# was to avoid writing later code. Does that mean that auto-properties are not relevant for the structs?

推荐答案

在C＃6，本的根本消失的;在code。在这个问题编译罚款。

In C# 6, this simply goes away; the code in the question compiles fine.

尽管斯特凡比地址回答这个问题，我的有无的劝你不要用一个可变的结构 - 它的会咬你。可变的结构是邪恶的。

While Stefan has the answer than addresses the question, I have to advise you not to use a mutable struct - it will bite you. Mutable structs are evil.

IMO，正确的解决这里简直是：

IMO, the "correct" fix here is simply:

struct Structure
{
    public Structure(int a, int b)
    {
        propertyA = a;
        propertyB = b;
    }
    private readonly int propertyA, propertyB;
    public int PropertyA { get { return propertyA; } }
    public int PropertyB { get { return propertyB; } }
}

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