如何将ConcurrentDictionary转换为Dictionary？

Question

我有一个ConcurrentDictionary对象,我想将其设置为Dictionary对象.

不允许在他们之间施放.那我该怎么做？

Answer 1

本ConcurrentDictionary<K,V>类实现了IDictionary<K,V>接口,这足以满足大多数要求.但如果你真的需要具体Dictionary<K,V>......

var newDictionary = yourConcurrentDictionary.ToDictionary(kvp => kvp.Key,
                                                          kvp => kvp.Value,
                                                          yourConcurrentDictionary.Comparer);

// or...
// substitute your actual key and value types in place of TKey and TValue
var newDictionary = new Dictionary<TKey, TValue>(yourConcurrentDictionary, yourConcurrentDictionary.Comparer);

Answer 2

为什么需要将其转换为字典？ConcurrentDictionary<K, V>实现IDictionary<K, V>接口,是不够的？

如果你真的需要Dictionary<K, V>,你可以使用LINQ 复制它:

var myDictionary = myConcurrentDictionary.ToDictionary(entry => entry.Key,
                                                       entry => entry.Value);

请注意,这是一个副本.您不能只将ConcurrentDictionary分配给Dictionary,因为ConcurrentDictionary不是Dictionary的子类型.这就是IDictionary这样的接口的全部要点:您可以从具体实现(并发/非并发hashmap)中抽象出所需的接口("某种字典").

Answer 3

我想我已经找到了办法.

ConcurrentDictionary<int, int> concDict= new ConcurrentDictionary<int, int>( );
Dictionary dict= new Dictionary<int, int>( concDict);