6、多对多关系，从两个表中选择字段到一个对象

我花了一个下午的StackOverflow和谷歌寻找一种方法来做一个简单的SQL查询使用linq到实体。我试图从两个表通过多对多关系连接的数据。在SQL中，我将这样写查询:

   SELECT v.[VendorID]
    , t.[UnitNumber]
    , t.[Name]
    , t.[Address]
    , t.[CityStateZip]
FROM [Tenant] t
INNER JOIN [TenantVendor] tv ON tv.[TenantID] = t.[TenantID]
INNER JOIN [Vendor] v on v.[VendorID] = tv.[VendorID]
WHERE t.[UnitNumber] LIKE '%100A%'
    AND t.[CompanyID] = 17874;

我在列表中有一个对象，我选择了它的数据它看起来像这样它直接应用于网格:

public class SearchObject
    {
        public int IDField { get; set; }
        public string UniqueField { get; set; }
        public string Name { get; set; }
        public string Address { get; set; }
        public string CityStateZip { get; set; }
    }

问题在于，m2m表仅由两个表中的主键组成，因此它没有实体可选择。它们在彼此的实体下显示为如下的集合(来自租户实体):

public virtual ICollection<Vendor> Vendors { get; set; }

我更喜欢lambda表达式，但查询也会工作得很好。我得到的最接近的是这两个:

SearchData = DBContext.Tenants
             .Where(t => t.Company.Name == CompanyName && t.UnitNumber.ToString().Contains(SearchText))                            
             .OrderBy(DynamicSort)
             .Skip(StartRow)
             .Take(PageSize)
             .Select(t => new SearchObject { IDField = t.Vendors, UniqueField = t.UnitNumber.ToString(), Name = t.Name, Address = t.Address, CityStateZip = t.CityStateZip })
             .ToList();

这个不行，因为t. vendor是一个集合，我想要的只是vendorID。

这一个工作，但返回太多的记录，因为它缺少两个表之间的连接:

SearchData = (from t in DBContext.Tenants
              from v in DBContext.Vendors
              where t.Company.Name == CompanyName && t.UnitNumber.ToString().Contains(SearchText) 
              select new SearchObject { IDField = v.VendorID , UniqueField = t.UnitNumber.ToString(), Name = t.Name, Address = t.Address, CityStateZip = t.CityStateZip })
              .ToList();

EDIT/UPDATE在element为我提供了正确的答案后，我想出了如何使用c#方法实现相同的结果，SelectMany是关键。

SearchData = DBContext.Tenants
    .Where(t => t.Company.Name == CompanyName && t.UnitNumber.ToString().Contains(SearchText))
    .OrderBy(DynamicSort)
    .Skip(StartRow)
    .Take(PageSize)
    .SelectMany(t=>t.Vendors.Select(v => new SearchObject { IDField = v.VendorID, UniqueField = t.UnitNumber.ToString() + " - " + v.VendorNumber, Name = t.Name, Address = t.Address, CityStateZip = t.CityStateZip }))                                                                                                        
    .ToList();

SearchData = (from t in DBContext.Tenants
                                 from v in t.Vendors
                                 where t.Company.Name == CompanyName && t.UnitNumber.ToString().Contains(SearchText) 
                                select new SearchObject { IDField = v.VendorID , UniqueField = t.UnitNumber.ToString(), Name = t.Name, Address = t.Address, CityStateZip = t.CityStateZip })
                                .ToList();