不可变字典< TKey，TValue> [英] Immutable Dictionary<TKey, TValue>

问题描述

如何为不可变的Dictionary<TKey, TValue>类实现构造函数?

How would you implement constructors for an immutable Dictionary<TKey, TValue>-like class?

还可以允许用户使用以下语法:

Also, is it possible to allow users to use the syntax:

ImmutableDic<int, int> Instance = new ImmutableDic<int, int> { {1, 2}, {2, 4}, {3,1} };

推荐答案

最简单的解决方案是编写一个接受可变IDictionary<TKey, TValue>的构造函数.构建可变字典，然后将其传递给不可变字典的构造函数:

The simplest solution is to write a constructor that accepts a mutable IDictionary<TKey, TValue>. Build the mutable dictionary and just pass it to the constructor of your immutable dictionary:

var data = new Dictionary<int, int> { {1, 2}, {2, 4}, {3,1} };
var instance = new ImmutableDic<int, int>(data);

如BoltClock的注释中所述，初始化器语法不能与不可变字典一起使用，因为它需要Add方法.

As explained in BoltClock's comment, the initializer syntax can't be used with an immutable dictionary, since it requires an Add method.

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