Each element of the first collection appears in the result set of a group join regardless of whether correlated elements are found in the second collection.

第一个集合中的每个元素都会出现在分组联接的结果集内，而无论是否在第二个集合中找到相关元素。

youdao

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。

youdao

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。

youdao