LINQ 加入多个条件？

Question

我有以下有效的 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*

检查具有所提供地址名称的地址是否链接到具有所提供公司 ID 的公司。

如何在 LINQ for EF 中表达这一点？

更新:Address 和 Company 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 仅支持相等联接。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}