字典用锁或Concurency字典？ [英] Dictionary with lock or Concurency Dictionary?

问题描述

这是pferred在多线程应用程序$ P $：  字典，提供锁定对象 要么  并发字典

Which is preferred in a multi-threaded application: Dictionary with lock object or Concurrency Dictionary

这是有效的，我为什么要使用一个或其他？

Which is efficient and why should I use one or the other?

编辑1：存储的GUID键和布尔作为价值

edit 1: Storing Guid as key and bool as value.

编辑2：2个以上的工作线程，一个UI线程

edit 2: more than 2 worker threads and one UI thread.

推荐答案

请仔细阅读有关的 ConcurrentDictionary 。它有一些不明显的特点。

Read carefully about ConcurrentDictionary. It has some unobvious features.

下面是其中一些：

• 如果两个线程调用 AddOrUpdate 有不保证其工厂代表将被调用，甚至不能保证，如果一个工厂代表将产生一些项目，这个项目将是存储在字典中。
• 按的GetEnumerator 获得枚举器调用的不可以的快照，可以枚举过程中被修改（即不引起任何异常）。
• 键和值属性对应的集合的快照，并可能与实际的词典状态。
• 等

• If two threads call AddOrUpdate there's no guarantees about which of factory delegates will be called and even no guarantee that if a factory delegate will produce some item that this item will be stored in dictionary.
• Enumerator obtained by GetEnumerator call is not a snapshot and may be modified during enumeration (that doesn't cause any exceptions).
• Keys and Values properties are snapshots of corresponding collections and may not correspond to actual dictionary state.
• etc.

所以，请阅读 ConcurrentDictionary 再次决定，如果这种行为是你所需要的。

So please read about ConcurrentDictionary again and decide if this behavior is what you need.

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