为了确保高效的查询，一定要为排序的数据属性添加索引。
To ensure high performance queries, be sure to add an index to any attribute you sort your data using.
要改进这个查询的性能，请为piid属性添加索引，参见清单14。
To improve performance of this query, an index for the piid attribute has been added as shown in Listing 14.
(3)你怎样指出你想要关于，比如说，一个索引设置者，一个属性获取者，或是一个事件处理添加者的信息呢？
(3) How do you specify that you want the info of, say, an indexer setter, or a property getter, or an event handler adder?
(3)你怎样指出你想要关于，比如说，一个索引设置者，一个属性获取者，或是一个事件处理添加者的信息呢？
(3) How do you specify that you want the info of, say, an indexer setter, or a property getter, or an event handler adder?
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