为什么在C＃中字典比哈希表更受青睐？ [英] Why is Dictionary preferred over Hashtable in C#?

问题描述

在大多数编程语言中，字典比哈希表更受青睐。
背后的原因是什么？

In most programming languages, dictionaries are preferred over hashtables. What are the reasons behind that?

推荐答案

就其价值而言，词典是 >（在概念上）哈希表。

For what it's worth, a Dictionary is (conceptually) a hash table.

如果您的意思是为什么我们要使用 Dictionary< TKey，TValue> 类而不是 Hashtable 类？，那么答案很简单： Dictionary< TKey，TValue> 是一个泛型类型，不是 Hashtable 。这意味着您可以使用 Dictionary< TKey，TValue> 获得类型安全性，因为您不能在其中插入任何随机对象，也不必强制转换值

If you meant "why do we use the Dictionary<TKey, TValue> class instead of the Hashtable class?", then it's an easy answer: Dictionary<TKey, TValue> is a generic type, Hashtable is not. That means you get type safety with Dictionary<TKey, TValue>, because you can't insert any random object into it, and you don't have to cast the values you take out.

有趣的是，.NET Framework中的 Dictionary< TKey，TValue> 实现基于 Hashtable ，您可以从源代码中的此注释中看出：

Interestingly, the Dictionary<TKey, TValue> implementation in the .NET Framework is based on the Hashtable, as you can tell from this comment in its source code:

通用词典是从Hashtable的源中复制的

The generic Dictionary was copied from Hashtable's source

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