问题
I am using lightswitch and I have a "Grid" with table A. Table A related to Table B and table b related to table C. Now how do I access data from table c using Grid's PreprocessQuery or filter?
回答1:
You can expand each relationship in the query designer. Below I am creating a filter in the query designer on my QuoteLines table which has a relationship to my Quotes table which has a relationship to my RepFirms table which has a relationship to my InsideSalesReps table. You can filter on any data that is related to any of the linked tables.
来源：https://stackoverflow.com/questions/29002375/lightswitch-filter-with-multiple-tables