Question

我有以下工作SQL查询：

select a.Id, a.Name
from Addresses a join Companies c 
                on c.AddressId = a.Id
                or c.MailAddressId = a.Id
                or c.Id = a.CompanyId
where c.Id = *CompanyId* and a.Name = *AddressName*

检查具有提供的地址名称的地址是否链接到具有提供的公司ID的公司。

如何在LINQ for EF中表达这一点？

更新：地址和公司类如下（仅包含与此问题相关的详细信息）：

public class Address
{
    public int Id {get; set;}
    public string Name {get; set;}
    public int? CompanyId {get; set;}
    public virtual Company {get; set;}
}
public class Company
{
    public int Id {get; set;}
    public string Name {get; set;}

    public int AddressId {get; set;}
    public virtual Address Address {get; set;}

    public int? MailAddressId {get; set;}
    public virtual Address MailAddress {get; set;}

    public virtual ICollection<Address> DeliveryAddresses {get; set;}
}

谢谢。

Answer 1

LINQ仅支持相等的连接。在其他情况下，您应该使用交叉连接，其中：

from a in Addresses
from c in Companies
where (c.AddressId == a.Id || c.MailAddressId == a.Id || c.Id == a.CompanyId)
         &&  (c.Id == *CompanyId* && a.Name == *AddressName*)
select new{a.Id, a.Name}

LINQ加入多个条件？

1 个答案: