在where子句中使用Array查询Linq？

I have searched for this, but still can't seem to get this to work for me. I have an array of Id's associated with a user (their Organization Id). These are placed in an int[] as follows:

我已经搜索了这个，但似乎仍然无法让这个为我工作。我有一个与用户关联的Id数组（他们的组织ID）。这些放在int []中如下：

int[] OrgIds = (from oh in this.Database.OrganizationsHierarchies
                       join o in this.Database.Organizations on oh.OrganizationsId equals o.Id
                       where (oh.Hierarchy.Contains(@OrgId))
                          || (oh.OrganizationsId == Id)
                       select o.Id).ToArray();

The code there isn't very important, but it shows that I am getting an integer array from a Linq query.

那里的代码不是很重要，但它表明我从Linq查询中获取了一个整数数组。

From this, though, I want to run another Linq query that gets a list of Personnel, that code is as follows:

但是，我希望运行另一个获取Personnel列表的Linq查询，该代码如下：

List<Personnel> query = (from p in this.Database.Personnels
                                where (search the array)
                                select p).ToList();

I want to add in the where clause a way to select only the users with the OrganizationId's in the array. So, in SQL where I would do something like "where OrganizationId = '12' or OrganizationId = '13' or OrganizatonId = '17'."

我想在where子句中添加一种方法来只选择数组中具有OrganizationId的用户。所以，在SQL中，我会做“像OrganizationId ='12'或OrganizationId ='13'或OrganizatonId = '17'的事情。”

Can I do this fairly easily in Linq / .NET?

我可以在Linq / .NET中相当容易地做到这一点吗？

4 个解决方案

#1

While this is probably better suited to a join, you can use this:

虽然这可能更适合加入，但您可以使用：

List<Personnel> query = 
    (from p in this.Database.Personnels 
    where OrgIds.Contains(p.OrgID) select p).ToList();

This will translate into SQL something like..

这将转化为SQL之类的东西......

where OrgID in (1,2,...,n)

#2

A check using the Contains method should do the job here.

使用Contains方法检查应该在这里完成工作。

var query = (from p in this.Database.Personnels
             where OrgIds.Contains(p.OrganisationId)
             select p).ToList();

#3

I wanted to give Adam credit for the answer, but I also wanted to share the code I used to make this work:

我想让Adam对答案给予信任，但我也想分享我用来完成这项工作的代码：

List<int> OrgIds= (from oh in this.Database.OrganizationsHierarchies
                       join o in this.Database.Organizations on oh.OrganizationsId equals o.Id
                       where (oh.Hierarchy.Contains(@OrgId))
                          || (oh.OrganizationsId == Id)
                       select o.Id).ToList();

List<Personnel> query = (from p in this.Database.Personnels
                                where (OrgIds.Contains(p.OrganizationId))
                                select p).ToList();

Thanks all,

-Matt

-Matt

#4

It would be something like this, OrgIds.ToList.Contains(p.OrginizationID)

它会是这样的，OrgIds.ToList.Contains（p.OrginizationID）

Though really I would do it more like this:

虽然我真的会这样做：

var OrgIds = (from oh in this.Database.OrganizationsHierarchies
                   join o in this.Database.Organizations on oh.OrganizationsId equals o.Id
                   where (oh.Hierarchy.Contains(@OrgId))
                      || (oh.OrganizationsId == Id)
                   select o.Id);
List<Personnel> query = (from p in this.Database.Personnels
                            where (OrgIds.Contains(p.OrigizationID)
                            select p).ToList();

That way the final query to get personnel will execute containing the combined query from both.

这样，获取人员的最终查询将包含来自两者的组合查询。