c# - MongoRepository 继承序列化错误

Question

在尝试将继承与 MongoRepository for C# 结合时，我遇到了序列化错误。

真正奇怪的是它可以在很短的时间内工作，但是在说重建或其他事情之后它就失败了。如果我删除该集合并创建一个新集合，它将一直有效，直到停止或重建。

我的代码如下:

public class Organization
{
      // other attributes removed for demonstration simplicity

      public List<Person> People { get;set; }
}

public abstract class Person
{
      public string Id {get;set;}
      public string Name {get;set;}
}

public class Employee : Person 
{
      public string Badge {get;set;}
}

public class Contractor : Person
{
     public string Company {get;set;}
}

当我尝试得到它时:

static MongoRepository<Organization> apps = new MongoRepository<Organization>();
return apps.Single(c => c.Id == id);

我收到的错误是:

An exception of type 'System.IO.FileFormatException' occurred in MongoDB.Driver.dll but was not handled in user code

Additional information: An error occurred while deserializing the People property of class API.Models.Organization: Instances of abstract classes cannot be created.

Answer 1

添加装饰器属性:

[BsonKnownTypes(typeof(Contractor), typeof(Employee))]

类解决了这个问题。