为什么 List<T>实现 IReadOnlyList<T>;在 .NET 4.5 中? [英] Why does List<T> implement IReadOnlyList<T> in .NET 4.5?
问题描述
为什么List要在.NET 4.5中实现IReadOnlyList?
Why does List<T> implement IReadOnlyList<T> in .NET 4.5?
List 不是只读的...
推荐答案
因为 List 实现了所有必要的方法/属性/等.(然后是一些)IReadOnlyList.接口是一种契约，上面写着我至少可以做这些事情."
Because List<T> implements all of the necessary methods/properties/etc. (and then some) of IReadOnlyList<T>. An interface is a contract that says "I can do at least these things."
IReadOnlyList 的文档说它代表一个只读的元素集合.
The documentation for
IReadOnlyList<T>says it represents a read-only collection of elements.
没错.该接口中没有mutator方法.这就是只读的意思，对吧?IReadOnlyList 以典型"(合同)方式使用，而不是作为 标记.
That's right. There are no mutator methods in that interface. That's what read-only means, right? IReadOnlyList<T> is used in the "typical" (contract) way, not as a marker.
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