如何合並兩個不同對象的列表？

Question

將 C# 與 LINQ 結合使用，如何合並兩個不同對象的列表，例如 Seminar 和 Conference？ 它們有一些共同的和一些不同的字段/屬性，並且不共享唯一的 ID。

class Seminar
{
   int id,
   DateTime joinDate,
   string name
}

class Conference
{
   Guid confNumber,
   DateTime joinDate
   Type type
}

我有一個列表：

List<Seminar>
List<Conference>

我需要將它們合並到一個超級List ：

List<Object>

代碼片段會很有幫助。

Answer 1

如果你只想要一個List<object>包含來自兩個列表的所有對象，那相當簡單：

List<object> objectList = seminarList.Cast<object>()
    .Concat(conferenceList)
    .ToList();

如果這不是您想要的，那么您需要定義“合並”的含義。

Answer 2

如果這是您對合並的定義，以下代碼對我來說很好用

一種解決方案

List<A> someAs = new List<A>() { new A(), new A() };
List<B> someBs = new List<B>() { new B(), new B { something = new A() } };

List<Object> allS = (from x in someAs select (Object)x).ToList();
allS.AddRange((from x in someBs select (Object)x).ToList());

其中 A 和 B 是一些類如下

class A
{
    public string someAnotherThing { get; set; }
}
class B
{
    public A something { get; set; }
}

另一種解決方案

List<A> someAs = new List<A>() { new A(), new A() };
List<B> someBs = new List<B>() { new B(), new B { something = string.Empty } };

List<Object> allS = (from x in someAs select (Object)new { someAnotherThing = x.someAnotherThing, something = string.Empty }).ToList();
allS.AddRange((from x in someBs select (Object)new { someAnotherThing = string.Empty, something = x.something}).ToList());

其中 A 和 B 的類定義為

class A
{
    public string someAnotherThing { get; set; }
}
class B
{
    public string something { get; set; }
}

Answer 3

純代碼的簡單方法

internal class Person
{
    public int Id { get; set; }
    public string UserName { get; set; }
}

internal class User
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

internal class UserPerson
{
    public int Id { get; set; }
    public string UserName { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

private static void Main(string[] args)
    {
        Person[] people = new Person[3] { new Person { Id = 1, UserName = "AliUserName" }, new Person { Id = 2, UserName = "MortezaUserName" }, new Person { Id = 3, UserName = "SalarUserName" } };
        User[] users = new User[4] { new User { FirstName = "ali", LastName = "Barzegari" }, new User { FirstName = "Morteza", LastName = "Sefidi" }, new User { FirstName = "Salar", LastName = "Pirzadeh" }, new User { FirstName = "Babak", LastName = "Hasani" } };

        UserPerson[] userPeople = new UserPerson[people.Length > users.Length ? people.Length : users.Length];
        if (people.Length > users.Length)
            for (int i = 0; i < people.Length; i++)
            {
                userPeople[i] = new UserPerson
                {
                    Id = people[i].Id,
                    UserName = people[i].UserName,
                    FirstName = users.Length <= i ? "" : users[i].FirstName,
                    LastName = users.Length <= i ? "" : users[i].LastName
                };
            }
        else
            for (int i = 0; i < users.Length; i++)
            {
                userPeople[i] = new UserPerson
                {
                    Id = people.Length <= i ? 0 : people[i].Id,
                    UserName = people.Length <= i ? "" : people[i].UserName,
                    FirstName = users[i].FirstName,
                    LastName = users[i].LastName
                };
            }
        Console.ReadLine();
    }