将 2 个查询的结果添加到一个列表中，然后对其进行排序

Question

在我的模型中，我有 2 个类：ParticipantCompany 和 ParticipantPerson，它们都继承自 Participant 并具有字符串属性 .Name .他们也都意识到 IParticipant 要求他们有 .Name

public interface IParticipant 
{
    public string Name { get; set; }
}

public class ParticipantCompany : Participant, IParticipant
{
    public ParticipantCompany():this(false, "","","","") { }
    public ParticipantCompany (bool isclient) : this(isclient, "","","","") { }
    public ParticipantCompany(bool isclient, string name, string address, string inncompany, string ogrn) : base(isclient, SubjectType.Company)
    {
        Name = name;
        Address = address;
        InnCompany = inncompany;
        Ogrn = ogrn;
    }
    public string InnCompany { get; set; }
    public string Ogrn { get; set; }
}
public class ParticipantPerson : Participant, IParticipant
{
    public ParticipantPerson() : this(false,"","","","") { }
    public ParticipantPerson(bool isclient) : this(isclient, "", "", "", "") { }
    public ParticipantPerson(bool isclient, string name, string address, string innperson, string ogrnip) : base(isclient, SubjectType.Person) 
    {
        Name = name;
        Address = address;
        InnPerson = innperson;
        Ogrnip = ogrnip;
    }
public string InnPerson { get; set; }
    public string Ogrnip { get; set; }
}
public abstract class Participant
{
    public Participant(bool isclient, SubjectType Type,  string name, string address) 
    { 
        SubjType = Type;
        IsClient = isclient;
        Name = name;
        Address = address;
    }

    public Participant(bool isclient, SubjectType Type ) : this(isclient, Type, "","")
    {

    }
    public int Id { get; set; }
    public  SubjectType SubjType { get; private set; }
    public bool IsClient { get; set; }
    public string Name { get; set; }
    public string Address { get; set; }

    public List<LegalCase> Cases { get; set; } = new List<LegalCase>();

}

这是模型本身：

class CaseContext : DbContext
{
    public DbSet<ParticipantCompany> Companies{ get; set; }
    public DbSet<ParticipantPerson> Persons { get; set; }
    public DbSet<LegalCase> Cases { get; set; }
    protected override void OnConfiguring(DbContextOptionsBuilder options)
        => options.UseSqlite("Data Source=Clients.db");

}

我想做的是查询所有 Company 和所有 Person，将结果合并到一个列表中，然后按 .Name 排序列表。

        using(var db = new CaseContext())
        {
            var companies = db.Companies.ToList();
            var persons = db.Persons.ToList();
            //Cant convert from System.Collections.
            //Generic.List<Magna.CaseModel.ParticipantPerson> to 
            //System.Colleciton.Generic.IEnumerable<Magna.CaseModel.ParticipantCompany>
            List<IParticipant> participants = companies.AddRange(persons);

        }

Answer 1

我们可以将所有公司和个人合并到一个列表中，如下所示：

//store actual data in below two variables
List<ParticipantPerson> participantPersons = new List<ParticipantPerson>();
List<ParticipantCompany> participantCompanies = new List<ParticipantCompany>();

//Merge them using Linq and anonymous types
var mergedList = participantPersons.Select(pp => new { Id = pp.Id, SubjType = pp.SubjType, IsClient = pp.IsClient, Name = pp.Name, Address = pp.Address,  InnPerson = pp.InnPerson, Ogrnip = pp.Ogrnip, InnCompany = (string)null, Ogrn = (string)null }).ToList();
mergedList.AddRange(participantCompanies.Select(pc => new {Id = pc.Id, SubjType = pc.SubjType, IsClient = pc.IsClient, Name = pc.Name, Address = pc.Address, InnPerson = (string) null, Ogrnip = (string) null, InnCompany = pc.InnCompany, Ogrn = pc.Ogrn}));

或者我们也可以创建一个新的 class 具有上述所有匿名类型的属性，并在 Select 查询中使用该 class 的对象而不是匿名类型。

将 2 个查询的结果添加到一个列表中，然后对其进行排序

Add results of 2 queries into a single list and then sort it

c#

list

entity-framework-core

ef-core-5.0