Using a string is unwieldy, and it forces you to reserve a specific number of characters in the string for each value or to use a separator character to delimit each value.
使用字符串非常笨拙，而且必须为字符串中的每个值保留固定的字符数，或者使用分隔符来划分。
Having two methods seems a bit wasteful. It would be nice if we could eliminate the second joiner method and declare that the separator argument in the first joiner has a default value.
写两个函数似乎有点浪费，如果我们能消除第二个joiner方法，在第一个jioner方法里为separator参数声明一个默认值，那就太好了。
Separator attribute for XSL: value-of.
value - of的分隔符属性。
Returns a string value consisting of all the elements of an array concatenated together and separated by the specified separator string.
返回一个字符串值，其中包含一个数组的所有元素，这些元素连接在一起，并由指定的分隔符字符串分隔。
Gets a value indicating whether the list control contains a separator between items in the list.
获取一个值，该值指示列表控件是否包含列表项之间的分隔符。
Gets a value indicating whether the list control contains a separator between items in the list.
获取一个值，该值指示列表控件是否包含列表项之间的分隔符。
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