的ConcurrentDictionary<K,V>$c$c>类实现 的IDictionary＆LT; K，V＆GT; 一>接口，这应该足以满足大多数要求。但是，如果你真的需要一个具体的Dictionary<K,V>$c$c>...

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

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