We then set up a second selector that specifies a sequence number of 2 along with the group identifier.
然后,我们将设置第二个选择器,以执行序列号2和相应的组标识符。
This differs from the result selector in a non-group join, which cannot access elements from the first collection that have no match in the second collection.
这与无群组联结的结果选取器不同,如果在第二个集合中没有相符项目,该选取器就无法存取第一个集合中的项目。
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