如果在键表中包含该元素，则布尔值设置成获取characters方法中的元素数据。

If the element is contained in the keys table, a Boolean is set to catch the element data in the characters method.

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获取由指定枚举数检索的枚举中的元素数。

Gets the number of elements in the enumeration that was retrieved by the specified enumerator.

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获取由指定枚举数检索的枚举中的元素数。

Gets the number of elements in the enumeration that was retrieved by the specified enumerator.

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