Hash Set<T>.Enumerator. Move Next 方法
将枚举器推进到不可变哈希集的下一个元素。Advances the enumerator to the next element of the immutable hash set.
public: virtual bool MoveNext();
public bool MoveNext ();
abstract member MoveNext : unit -> bool override this.MoveNext : unit -> bool
Public Function MoveNext () As Boolean
true if the enumerator was successfully advanced to the next element;
false if the enumerator has passed the end of the hash set.
创建枚举器后修改了哈希集。The hash set was modified after the enumerator was created.