只读在.NET 4.0中列表或修改列表 [英] Read-only list or unmodifiable list in .NET 4.0

问题描述

据我所知，.NET 4.0仍然缺乏只读列表。为什么该框架还缺少这个功能？这不是一个常见的​​功能性函数为领域驱动设计的？

From what I can tell, .NET 4.0 still lacks read-only lists. Why does the framework still lack this functionality? Isn't this one of the commonest pieces of functionality for domain-driven design?

为数不多的优势Java有过C＃这是在的Collections.unmodifiablelist(list）方法，这似乎是在IList的<姗姗来迟; T>或者List< T>

One of the few advantages Java has over C# is this in the form of the Collections.unmodifiablelist(list) method, which it seems is long overdue in IList<T> or List<T>.

使用的IEnumerable< T> 是问题的最简单的解决方案 - 了ToList CAN使用，并返回一个副本。

Using IEnumerable<T> is the easiest solution to the question - ToList can be used and returns a copy.

推荐答案

您正在寻找的 ReadOnlyCollection还 ，它已经出现自.NET2。

You're looking for ReadOnlyCollection, which has been around since .NET2.

IList<string> foo = ...;
// ...
ReadOnlyCollection<string> bar = new ReadOnlyCollection<string>(foo);

或

List<string> foo = ...;
// ...
ReadOnlyCollection<string> bar = foo.AsReadOnly();

这将创建一个只读的视图的，这反映了对所做的更改包裹集合。

This creates a read-only view, which reflects changes made to the wrapped collection.

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