泛型和System.Collections中 [英] Generics and System.Collections

问题描述

迁移到.NET 2.0 +后是有过一个理由仍然使用systems.Collections命名空间（除了保持传统的code）？如果仿制药空间总是被用来代替？

After moving to .NET 2.0+ is there ever a reason to still use the systems.Collections namespace (besides maintaining legacy code)? Should the generics namespace always be used instead?

推荐答案

在大多数情况下，一般的收藏品将执行比非泛型对口更快，让你有一个强类型集合的利益。在比较System.Collections中和System.Collections.Generic现有的收藏，你会得到下面的移民：

For the most part, the generic collections will perform faster than the non-generic counterpart and give you the benefit of having a strongly-typed collection. Comparing the collections available in System.Collections and System.Collections.Generic, you get the following "migration":

    Non-Generic               Generic Equivalent
    ------------------------------------------------------------
    ArrayList                 List<T>
    BitArray                  N/A
    CaseInsensitiveComparer   N/A
    CollectionBase            Collection<T>
    Comparer                  Comparer<T>
    DictionaryBase            Dictionary<TKey,TValue>
    Hashtable                 Dictionary<TKey,TValue>
    Queue                     Queue<T>
    ReadOnlyCollectionBase    ReadOnlyCollection<T>
    SortedList                SortedList<TKey,TValue>
    Stack                     Stack<T>

    DictionaryEntry           KeyValuePair<TKey,TValue>

    ICollection               N/A (use IEnumerable<T> or anything that extends it)
    IComparer                 IComparer<T>
    IDictionary               IDictionary<TKey,TValue>
    IEnumerable               IEnumerable<T>
    IEnumerator               IEnumerator<T>
    IEqualityComparer         IEqualityComparer<T>
    IList                     IList<T>

ICollection的是不变的（没有成员更改集合的内容），而ICollection的＆LT; T＆GT;是可变的。这使得在名称相似的接口仅在ICollection的和IEnumerable＆LT; T＆GT;由非常小的差异。

ICollection is immutable (no members to change the contents of the collection) while ICollection<T> is mutable. This makes the interfaces similar in name only while ICollection and IEnumerable<T> differ by very little.

从这份名单中，没有一个通用的对应唯一的非通用类是BitArray和CaseInsensitiveComparer。

From this list, the only non-generic classes that don't have a generic counterpart are BitArray and CaseInsensitiveComparer.

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