I'm reading data from a database into the datasource of a gridview. I can have my Table2 empty. I get an error saying that Table2 doesn't include that column when I attempt to bind columns from it. I examined the information being returned by the query. Table 2 exists, but columns are absent. Simply Count: 0
How can I access related table columns even if they are empty?
return entities.Table1 .Include("Table2") .Include("Table3 ") .Include("Table2.Table4") .Where(results => results.ID == anotherId) .ToList(); Table1 one to many Table2 Table3 one to many Table1 Table4 one to many Table2
When utilizing EF Classes include Table1, Table2, and so on.
a technique is used to cache connected records in a single query. You may eliminate
Your query and statements will function similarly. Therefore, you receive count = 0 for Table2 attribute if there are no related records between Table1 and Table2 in your database.
Rerun your query after adding some linked records to Tables 1 and 2 in your database. Table 2 is false
I believe even that
is unnecessary if you use
You should be aware that if you want a one-to-many relationship, Table2 must have an FK to Table1.
If you utilize EF, you can gather data from a few tables without having to use joins. But you need well defined FKs. You just use
var collction = table1.Table2
to obtain every Table2 object connected to a Table 1 object.