This is yet another class that supports sorted collection of objects where each sort key must be unique.

这是另外一个可以支持排序的对象集合的类，其中每个排序键必须是唯一的。

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Gets the sort key for the specified string.

取得指定之字串的排序键。

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Sort key length will not be affected unless the strength level is also increased.

这个属性不影响排序键的长度，除非还增加了强度级。

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Sort key length will not be affected unless the strength level is also increased.

这个属性不影响排序键的长度，除非还增加了强度级。

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