最简单的 protobuf-net 示例 4 所需的帮助 [英] Help needed with the most trivial protobuf-net example 4

问题描述

  [DataContract]
  public class I<TId>
  {
    [DataMember(Order = 1)]
    public TId Id { get; set; }
  }

  [DataContract]
  public class J : I<int>
  {
    [DataMember(Order = 1)]
    public string Description { get; set; }
  }

  class Program
  {
    static void Main()
    {
      var o = new J { Id = 5, Description = "xa-xa", };
      using (var ms = new MemoryStream())
      {
        Serializer.Serialize(ms, o);
        ms.Position = 0;
        var o2 = Serializer.Deserialize<J>(ms);
        Debug.Assert(o.Id == o2.Id);
      }
    }
  }

为什么断言失败以及如何修复它?

Why does the assertion fail and how to fix it?

谢谢.

推荐答案

它失败是因为 protobuf-net 无法处理继承，除非您通过属性或运行时类型模型为其提供更多线索 - 本质上它需要从某处(即您)获取字段编号.我很满意地承认，在这种情况下，跟踪警告可能会有用，因为合理很清楚，这种继承场景可能不仅仅是 J.

It fails because protobuf-net can't process inheritance unless you give it more of a clue either via attributes or a runtime type-model - essentially it needs to get a field number from somewhere (i.e. you). I am content to concede that maybe a trace warning might be useful in this case, since it is reasonably clear that there is probably more to this inheritance scenario than just J.

以下添加(在运行时)修复了它:

The following addition (at runtime) fixes it:

RuntimeTypeModel.Default.Add(typeof(I<int>), true).AddSubType(2, typeof(J));

(2 的唯一意义在于它不与为 I 定义的任何其他字段冲突).

(the only significance of 2 there is that it doesn't conflict with any other fields defined for I<int>).

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