隐藏结构参数的构造函数 [英] hide parameterless constructor on struct

问题描述

是否有可能隐藏用户在C＃中参数的构造函数

Is it possible to hide the parameterless constructor from a user in c#

我要强迫他们总是使用带参数的构造函数

I want to force them to always use the constructor with parameters

例如。这个位置类

public struct Position
{
    private readonly int _xposn;
    private readonly int _yposn;

    public int Xposn
    {
        get { return _xposn; }
    }

    public int Yposn
    {
        get { return _yposn; }
    }

    public Position(int xposn, int yposn)
    {
        _xposn = xposn;
        _yposn = yposn;
    }        
}

我只希望用户能够新建立一个位置通过指定x和y坐标

I only want users to be able to new up a Position by specifying the x and y coordinates

不过，参数的构造函数总是availiable

However, the parameterless constructor is ALWAYS availiable

我不能让它私有。甚至把它定义为公共

I cannot make it private. Or even define it as public

我已阅读本 <一href="http://stackoverflow.com/questions/333829/why-cant-i-define-a-default-constructor-for-a-struct-in-net">http://stackoverflow.com/questions/333829/why-cant-i-define-a-default-constructor-for-a-struct-in-net

但它没有真正帮助

如果这是不可能的 - 什么是检测，如果我传递的地位价值的最佳途径。

If this is not possible - what is the best way to detect if the Position I am being passed has values?

明确地检查每一个属性字段？有没有雨衣的方式？

Explicity checking each property field? Is there a slicker way?

感谢

推荐答案

没有，你不能做到这一点。正如你所说，类似的问题已经被问过 - 我认为答案是很清楚，你不能这样做

No, you can't do this. As you said, similar question has been asked before - and I thought the answer was fairly clear that you couldn't do it.

您的可以的<一个href="http://msmvps.com/blogs/jon_skeet/archive/2008/12/10/value-types-and-parameterless-constructors.aspx">create私人无参数的构造函数的结构，但不是在C＃。但是，即使你这样做，它并没有真正帮助 - 因为你可以很容易地解决它：

You can create a private parameterless constructor for a struct, but not in C#. However, even if you do that it doesn't really help - because you can easily work around it:

MyStruct[] tmp = new MyStruct[1];
MyStruct gotcha = tmp[0];

这将是MYSTRUCT的默认值 - 全零的价值 - 而没有调用构造函数

That will be the default value of MyStruct - the "all zeroes" value - without ever calling a constructor.

您可以轻松地添加一个验证的方法来你的结构，并调用每次收到的一个作为参数，无可否认的。

You could easily add a Validate method to your struct and call that each time you received one as a parameter, admittedly.

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