c# - 更新在 C5 集合中如何工作？

Question

如何在 C5 collection 中使用更新方法？

例如，假设我有一个集合，我想用 B 替换项目 A。我希望它是这样的:

HashSet<String> s = new HashSet<String>();
s.add("A");
s.update("A", "B");

但是，Update 采用单个参数，documentation有以下要说的:

bool Update(T x) returns true if the collection contains an item equal to x, in which case that item is replaced by x; otherwise returns false without modifying the collection. If any item was updated, and the collection has set semantics or DuplicatesByCounting is false, then only one copy of x is updated; but if the collection has bag semantics and DuplicatesByCounting is true, then all copies of the old item are updated. If any item was updated, then events ItemsRemoved, ItemsAdded and CollectionChanged are raised. Throws Read- OnlyCollectionException if the collection is read-only.

有什么想法吗？谢谢。

Answer 1

我认为您需要通过两个单独的操作来完成此操作:

s.Remove("A");
s.Add("B");

Update 方法只有在两个项目被认为相等时才有效(两个不同的对象可以相等)。但是 "A" 和 "B" 不相等。