C# MongoDB MongoDB.Bson.BsonSerializationException: '' cannot use element name '' because it is already being used by property '' of type ''

Question

我有以下数据模型：（使用 C# 和 MongoDB 工作）

public class aClass
{
    public virtual string Content { get; set; }
}

public class aClassDao
{
    public override string Content { get; set; }
}

public class MongoDbContext
{
    public IMongoDatabase Database { get; }
    public IMongoCollection<aClassDao> Classes=> Database.GetCollection<aClassDao>("Classes");

    public MongoDbContext()
    {
        // some connection logic
    }
}

当我启动我的应用程序时，出现以下错误：

MongoDB.Bson.BsonSerializationException: The property 'Content' of type 'aClassDao' cannot use element name 
'Content' because it is already being used by property 'Content' of type 'aClass'.