Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
464 views
in Technique[技术] by (71.8m points)

c# - LINQ Include on a one-to-many with .Where() not working?

I'm trying to query Users including each user's Interests, but only where an Interest meets certain criteria:

  return db.Users.Include(u => u.Interests.Where(s => s.TenantId == tenantId))

But I get an error:

The Include path expression must refer to a navigation property defined on the type. Use dotted paths for reference navigation properties and the Select operator for collection navigation properties.

I played with the idea of pushing the .Where outside, but haven't been able to get it working.

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

Try this:

return db.Users.Include("Interests").Where(u => u.Interests.Any(i => i.TenantId == tenantId));

This causes the users to be loaded, but only where the tenantId matches. The Interests related entities will be eager loaded for those users when the query executes.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...