我无法反序列化之前成功序列化的数据 [英] I cannot deserialize data previously serialized successfully

问题描述

我在 Google 中随机输入最快的序列化 c#"，结果得到了 protobuf.net.我试过了，我觉得我还可以正确序列化，因为我不能反序列化，现在没有办法知道了吗?！

I was randomly typing 'fastest serializing c#' into Google and got protobuf.net as a result. I tried it and I think I can serialize properly yet since I can't deserilize, there is no way to tell now is there?!

当我试图反序列化时，我得到:

When trying to deserilaize I get :

A first chance exception of type 'ProtoBuf.ProtoException' occurred in protobuf-net.dll

酷.

要序列化的数据:

[ProtoContract]
public struct Cow
{
    [ProtoMember(1)]
    public float Weight{ get; private set; }
    [ProtoMember(2)]
    public bool[] HadCowlings{ get; private set; }

    public Cow(float weight, bool[] babies)
        : this()
    {
        this.Weight = weight;
        this.HadCowlings= (bool[])babies.Clone();
    }
...
}

[ProtoContract]
public class Pasture
{
    [ProtoMember(1)]
    public Point Position { get; private set; }
    [ProtoMember(2)]
    public Cow[] Cows { get; private set; }

    public static int HerdSize { get; private set; }

    public static float BoundWidth { get; private set;}
    public static float BoundHeight { get; private set; }

    public Pasture(Cow[] Cows, Point farmPosition)
    {
        this.Cows = (Cow[])Cows.Clone();
        Position = farmPosition;
    }
...
}

[ProtoContract]
public class Farm
{
    [ProtoMember(1)]
    public Point FarmIDCoordinates{ get; private set; }
    [ProtoMember(2)]
    public List<Pasture> Pastures{ get; private set; }

    public static float BoundWidth { get; private set; }
    public static float BoundHeight { get; private set; }

    public static int FarmSize { get; private set; }

    public Farm(int x, int y, FarmType fType)
    {
        if (fType == RegionType.STANDARD)
            Pastures = new List<Pasture>(//make a farm!);
        else
            Pastures = new List<Pasture>(//What he said);

        FarmIDCoordinates = new Point(x, y);
    }
...
}

方法:

设置:

 using (ObjectSerializer serializer = new ObjectSerializer())
{
     serializer.ProtoSerialize<Farm>(farm.ToString() + ".bin", aFarm)
}

获取:

using (ObjectSerializer serializer = new ObjectSerializer())
{
   try
   {
      farmsIOwn.Add(serializer.ProtoDeserialize<Farm>(
                  farmLat.X.ToString() + "_" + farmLong.Y.ToString() + ".bin"));
   }
   catch
   {
      // make me a dummy farm, crashing is for dummies
   }
}

ObjectSerializer:

public void ProtoSerialize<T>(string fileName, T objectGraph)
{

   using (var stream = File.Open(fileName, FileMode.Create))
   {
       Serializer.Serialize<T>(stream, objectGraph);
   }
}

public T ProtoDeserialize<T>(string fileName)
{
    T objectGraph;

    using (var stream = File.Open(fileName, FileMode.Open))
    {
       objectGraph = Serializer.Deserialize<T>(stream);
    }

    return objectGraph;
}

推荐答案

protobuf-net 可以通过多种不同的方式进行配置.默认情况下，它通过无参数构造函数创建对象，因为该选项适用于所有框架.在这个用法上，有点像XmlSerializer.因为您的类型没有构造函数，所以这种用法是行不通的.最简单的选择是添加一个无参数构造函数.要在完整框架上使用，这不需要 public - 所以 private/protected 等构造函数很好 - 但请注意这(private/protected) 不适用于 Silverlight 等.

protobuf-net can be configured in many different ways. By default, it creates objects via a parameterless constructor, because that option that works on all frameworks. In this usage, it is a bit like XmlSerializer. Because your types don't have a constructor, that usage can't work. The simplest option is to add a parameterless constructor. For use on the full framework this does not need to be public - so a private / protected etc constructor is fine - but note that this (private / protected) won't work on Silverlight etc.

下一个选项是完全跳过构造函数 - 很像 DataContractSerializer.这可以通过属性或通过类型模型的运行时配置来完成.为了说明第一个:

The next option is to skip the constructor completely - a lot like DataContractSerializer. This can be done via attributes or via runtime configuration of the type-model. To illustrate the first:

[ProtoContract(SkipConstructor = true)]
public class Foo {...}

同样 - 这在大多数框架上都很好用，但有一些它不起作用(框架实用程序方法根本不存在).

Again - this works great on most frameworks, but there are a few where it doesn't work (the framework utility method to do it simply doesn't exist).

最后，您可以提供自己的工厂方法；每个类型的全局.这个工厂方法是一个 static 方法，它返回一个 vanilla 实例(可选地接受诸如序列化上下文、请求类型等).除了提供对构造的完全控制之外，如果您想提供对象池等，这也很有用.此选项适用于所有框架，但需要您编写额外的代码和配置.

Finally, you can provide your own factory methods; either per-type of globally. This factory method is a static method that returns a vanilla instance (optionally accepting things like the serialization-context, requested-type, etc). In addition to providing complete control over construction, this is also useful if you want to provide object-pooling etc. This option works on all frameworks, but requires you to write extra code and configuration.

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