防止其他班级更改班级中的列表 [英] Prevent other classes from altering a list in a class

问题描述

如果我有一个包含例如List< string>并且我希望其他类能够看到列表，但不能看到列表，可以声明

If I have a class that contains, for example, a List<string> and I want other classes to be able to see the list but not set it, I can declare

public class SomeClass()
{
    public List<string> SomeList { get; }
}

这将允许另一个类访问SomeList而不进行设置。

This will allow another class to access SomeList and not set it.

但是，尽管调用类无法设置列表，但是它可以添加或删除元素。我该如何预防？我想我可以使用一个字段并返回List的副本而不是使用属性，但这感觉并不正确。

However, although the calling class can't set the list, it can add or remove elements. How do I prevent that? I guess I could use a field and return a copy of the List instead of using a property, but that just doesn't feel right.

（这应该非常简单但是我一定会缺少某些东西。...

(This should be very simple but I must be missing something....)

推荐答案

您将无法使用自动属性。

You won't be able to use an autoproperty.

public class SomeClass()
{
    private List<string> someList;
    public IList<string> SomeList { 
        get { return someList.AsReadOnly(); }
    }
}

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