我的功能需要3 string[]
,然后使用ef6查询我的数据库来尝试找到匹配。列表中的列表中没有一个,一个或许多变量。
using (var db= new Db(ConnectionString))
{
var results =
await
db.dbases.Where(
w =>
portfolioSelected.Any(a => a == w.portfolio) &&
statusSelected.Any(a => a == w.statusname) &&
deskSelected.Any(a => a == w.assignedto)
).ToListAsync();
}
尝试此查询时,我将获得零结果。
我该如何编写此列表,以便3个列表可以具有任何构图,包括空,我得到了我想要的结果?
per jeroen heiers评论,我能够通过检查 string[]
是否为null,并分为一部分来分解查询。
using (var db = new Db(ConnectionString))
{
IQueryable<dbase> query = cmax.dbases.Where(w => w != null);
var results = new List<dbase>();
if (portfolioSelected != null)
query = query.Where(w => portfolioSelected.Any(a => a == w.portfolio));
if (statusSelected != null)
query = query.Where(w => statusSelected.Any(a => a == w.statusname));
if (deskSelected != null)
query = query.Where(w => deskSelected.Any(a => a == w.assignedto)); break;
results = await query.ToListAsync();
}