C# 什么是 ICollection？
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What is an ICollection?
提问by user1443110
What is a ICollection in C#?
什么是 C# 中的 ICollection？
private void SendEmail(string host, int port,
string username, string password,
string from, string to,
string subject, string body,
ICollection<string> attachedFiles)
回答by Christopher Rathermel
The ICollection<T>interface is the base interface for classes in the System.Collections.Genericnamespace.
该ICollection<T>接口是用于类的基接口System.Collections.Generic命名空间。
The ICollection<T>interface extends IEnumerable<T>and is extended by IDictionary<TKey, TValue>and IList<T>.
所述ICollection<T>界面延伸IEnumerable<T>，并且通过扩展IDictionary<TKey, TValue>和IList<T>。
An IDictionary<TKey, TValue>implementation is a collection of key/value pairs, like the Dictionary<TKey, TValue>class.
的IDictionary<TKey, TValue>实现是键/值对的集合，如Dictionary<TKey, TValue>类。
An IList<T>implementation is a collection of values, and its members can be accessed by index, like the List<T>class.
一个IList<T>实现是一个值的集合，它的成员可以通过索引访问，就像List<T>类一样。
回答by Micah Armantrout
ICollection is a interface that represents a collection, it also contains strongly typed members
ICollection 是一个表示集合的接口，它还包含强类型成员
Here is an example of how to implement that interface
这是如何实现该接口的示例
http://support.microsoft.com/kb/307484
http://support.microsoft.com/kb/307484
The Generic List Implements this interface
通用列表实现了这个接口
回答by Martin
A collection is a group of objects that have the same type (string in your example).
集合是一组具有相同类型（在您的示例中为字符串）的对象。
From the documentation:
从文档：
Objects of any type can be grouped into a single collection of the type Object to take advantage of constructs that are inherent in the language. For example, the C# foreach statement (for each in Visual Basic) expects all objects in the collection to be of a single type.
可以将任何类型的对象分组到 Object 类型的单个集合中，以利用语言中固有的构造。例如，C# foreach 语句（在 Visual Basic 中为 each）期望集合中的所有对象都属于单一类型。
ICollectionis the interface definition for a collection.
ICollection是集合的接口定义。
回答by payo
I think what the OP is actually trying to understand, is what implements ICollection<string>, as obviously new ICollection<string>()isn't going to fly.
我认为 OP 实际上试图理解的是什么实现了ICollection<string>，因为显然new ICollection<string>()不会飞。
As Micah pointed out, List<string>implements ICollection<string>. If you want to know what else does, take a look at ILSpy, and find the ICollection<T>type, analyze it, and see what implements it. Here are some of my results
正如 Micah 指出的那样，List<string>实现ICollection<string>. 如果你想知道还有什么作用，看看ILSpy，找到ICollection<T>类型，分析它，看看是什么实现了它。这是我的一些结果
- ArraySegment
- List
- LisT.SynchronizedList
- LinkedList
- SortedList
- SortedSet
- 数组段
- 列表
- ListT.SynchronizedList
- 链表
- 排序列表
- 有序集
... and more
... 和更多
Also, a plain ol' stringarray also implements ICollection<string>
此外，一个普通的 ol'string数组也实现了ICollection<string>
