方法一:
var query = db.Test.Where(x => true)
.Include(x => x.ColB.Select(s => s.ColBRelated))
.Include(x => x.ColC)
方法二:
var query = db.Test.Where(x => true);
query = query.Include("ColB");
query = query.Include("ColC");
query = query.Include("ColB.ColBRelated");
多级外链查询,test有外联数据colB和colC,colB有外链数据ColBRelated。