Question

我有DbSet<DtoProfile>。现在我想过滤我的个人资料。

我的模特：

public class DtoProfile {
    public IList<DtoLookingFor> LookingFor { get; set; } = new List<DtoLookingFor>();
    public virtual DtoSearch Search { get; set; }
    public Guid? SearchId { get; set; }
}
public class DtoLookingFor
{
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public Guid Id { get; set; }
    public LookingFor LookingFor { get; set; }
}
public enum LookingFor
{
    A, B, C, D, E
}
public class DtoSearch
{
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public Guid Id { get; set; }
    public virtual ICollection<DtoLookingFor> LookingFor { get; set; }
}

实施例： Profile1具有LookFor A，B，C并使用LookingFor B，C
来搜索 Profile2有LookFor B，D
Profile3有LookFor E
Profile1应该获取LookingFor为B或C的所有配置文件（在示例中为Profile1和Profile2）

如何使用IQueryable<DtoProfile>执行此操作？我已经从数据库中加载了DtoSearch，并且可以使用dtoSearch.Looking来访问所有DtoLookingFor

Answer 1

我会更改名为“LookingFor”的属性，真的很混乱，你有太多这些，它也是类名。

如果您选择输入profile1 - > gt，此工作示例将为您带来profile1 + profile2

    static void Main(string[] args)
    {
        List<DtoProfile> profiles = new List<DtoProfile>();
        var profile1 = new DtoProfile
        {
            LookingFor = new List<DtoLookingFor> { new DtoLookingFor { LookingFor = LookingFor.A }, new DtoLookingFor { LookingFor = LookingFor.B }, new DtoLookingFor { LookingFor = LookingFor.C } },
            Search = new DtoSearch
            {
                LookingFor = new List<DtoLookingFor> { new DtoLookingFor { LookingFor = LookingFor.B }, new DtoLookingFor { LookingFor = LookingFor.C } },
            },
            SearchId = new Guid("10000000-0000-0000-0000-000000000000")
        };

        var profile2 = new DtoProfile
        {
            LookingFor = new List<DtoLookingFor> { new DtoLookingFor { LookingFor = LookingFor.B }, new DtoLookingFor { LookingFor = LookingFor.D } },
            SearchId = new Guid("20000000-0000-0000-0000-000000000000")

        };

        var profile3 = new DtoProfile
        {
            LookingFor = new List<DtoLookingFor> { new DtoLookingFor { LookingFor = LookingFor.E } },
            SearchId = new Guid("30000000-0000-0000-0000-000000000000")

        };


        profiles.AddRange(new List<DtoProfile> { profile1, profile2, profile3 });

        IEnumerable<DtoProfile> query = GetMatchesForProfile(profiles, profile1);

        Console.WriteLine("Found: " + string.Join(",", query.Select(m => m.SearchId)));
        //result: Found: 10000000-0000-0000-0000-000000000000,20000000-0000-0000-0000-000000000000
    }

    private static IEnumerable<DtoProfile> GetMatchesForProfile(List<DtoProfile> profiles, DtoProfile profileToMatch)
    {
        return profiles.Where(searchProfile => profileToMatch.Search.LookingFor.Any(m => searchProfile.LookingFor.Any(z => z.LookingFor == m.LookingFor)));
    }

困难的实体框架查询

1 个答案: