切换为固定32之后，挑战失败

Question

我有一个用于正在开发的通信库的测试套件 protobuf-net 运行还可以。所有测试通过。但是，如果我将前缀从base128更改为固定32，则选择性序列化失败。

我从 TryDeserializeWithLengthPrefix 功能是：

System.ArgumentNullException was caught
  Message="Value cannot be null.\r\nParameter name: type"
  Source="protobuf-net"
  ParamName="type"

如果我简单地将prefixStyle.base128序列化和绝对序列化消息时，一切都可以正常工作。

有人知道会发生什么吗？

Answer 1

hohum，是的，看起来像一个错误（现在记录了）；可重复的示例下面。我会看看是否可以在火车上（不久）修复它。对不起。

using System;
using System.IO;
using ProtoBuf;
[ProtoContract]
public class Strange // test entity
{
    [ProtoMember(1)]
    public string Foo { get; set; } // test prop
    [ProtoMember(2)]
    public int Bar { get; set; } // test prop

    static void Main() {
        var original = new Strange { Foo = "abc", Bar = 123 };
        // serialize and deserialize with base-128
        using (MemoryStream ms = new MemoryStream()) {
            Serializer.SerializeWithLengthPrefix(ms, original, PrefixStyle.Base128,1);
            ms.Position = 0;
            object obj;
            Serializer.NonGeneric.TryDeserializeWithLengthPrefix(ms,
                PrefixStyle.Base128, i => typeof(Strange),out obj);
            var clone = (Strange)obj;
            Console.WriteLine("Foo via Base128: " + clone.Foo); // works fine
            Console.WriteLine("Bar via Base128: " + clone.Bar);
        }
        // serialize and deserialize with fixed-32
        using (MemoryStream ms = new MemoryStream())
        {
            Serializer.SerializeWithLengthPrefix(ms, original, PrefixStyle.Fixed32,1);
            ms.Position = 0;
            object obj;
            // BOOM here; oh how embarrassing
            Serializer.NonGeneric.TryDeserializeWithLengthPrefix(ms,
                PrefixStyle.Fixed32, i => typeof(Strange), out obj);
            var clone = (Strange)obj;
            Console.WriteLine("Foo via Fixed32: " + clone.Foo);
            Console.WriteLine("Bar via Fixed32: " + clone.Bar);
        }
    }
}