没有为类型定义序列化程序:System.Windows.Media.Media3D.Point3D [英] No serializer defined for type: System.Windows.Media.Media3D.Point3D

问题描述

我正在尝试使用protobuf net序列化一些数据.在序列化过程中，我遇到一个错误，即没有为Point3D类型定义序列化.我发现了一个类似这样的问题，但仍然无法实现和解决.链接如下:-未为以下类型定义序列化程序:System.Drawing.颜色

I am trying to serialize some data using protobuf net. During the serialization I am getting an error that No serialization defined for the type Point3D. I found one issue something like this but still unable to implement and resolve it. Link is as follow :- No serializer defined for type: System.Drawing.Color

[ProtoContract]
public class ReturnPanelData
{
    [ProtoMember(1)]
    public Point3D PlacedPoint3D { get; set; }
    [ProtoMember(2)]
    public double PlacementAngle { get; set; }
    [ProtoMember(3)]
    public string PanelName { get; set; }
}
[ProtoContract]
public class ReturnDataType
{
    [ProtoMember(1)]
    public List<ReturnPanelData> ReturnList { get; set; }
    [ProtoMember(2)]
    public double RemainderArea { get; set; }
    [ProtoMember(3)]
    public int Height { get; set; }
    [ProtoMember(4)]
    public int Width { get; set; }
    [ProtoMember(5)]
    public Point3D BasePoint3D { get; set; }
}
class Program
{
    private static HashSet<ReturnDataType> _processedList = new HashSet<ReturnDataType>();
    static void Main(string[] args)
    {
        using (var file = File.Create(@"D:\SavedPCInfo2.bin"))
        {
            Serializer.Serialize(file, _processedList);
        }
        Console.WriteLine("Done");
    }
}

我是JSON序列化/反序列化的初学者.如何解决此问题?

I am a begineer in JSON serialization/deserialization. How to resolve this issue ?

如果无法使用Protobuf Net序列化Point3D，那么还有什么其他方法可以序列化/反序列化一个非常大的列表(约有300000项)?

If it is not possible to serialize Point3D with Protobuf Net, what are the other options to serialize/deserialize a very big list (having approx 300000 items) ?

推荐答案

首先， protobuf-net 不是 JSON 序列化程序.它从协议缓冲区" 进行序列化-Google用于他们的大部分数据通信.

First off, protobuf-net is not a JSON serializer. It serializes from and to "Protocol Buffers" - the binary serialization format used by Google for much of their data communications.

话虽如此，但有几种解决方案可以使用protobuf-net序列化类型，而该类型不能用ProtoContract属性修饰:

That being said, there are several solutions to serialize a type, using protobuf-net, that cannot be decorated with ProtoContract attributes:

1. 当包含在其他类型中时，请使用代理或"shim"属性，如下所示此处所示的替代方法，或
2. 在运行时教导 RuntimeTypeModel 关于所有可序列化字段& 此处部分中所述的类型的属性没有属性的序列化.

1. When contained by some other type, use a proxy or "shim" property as is shown here, OR
2. Use a surrogate as is shown here, OR
3. In runtime teach the RuntimeTypeModel about all serializable fields & properties of the type as described here in the section Serializing without attributes.

对于选项2，由于 完全由其X，Y和Z坐标定义，很容易引入序列化代理:

For option 2, Since a Point3D is entirely defined by its X, Y and Z coordinates, it's very easy to introduce a serialization surrogate:

[ProtoContract]
struct Point3DSurrogate
{
    public Point3DSurrogate(double x, double y, double z) : this()
    {
        this.X = x;
        this.Y = y;
        this.Z = z;
    }

    [ProtoMember(1)]
    public double X { get; set; }
    [ProtoMember(2)]
    public double Y { get; set; }
    [ProtoMember(3)]
    public double Z { get; set; }

    public static implicit operator Point3D(Point3DSurrogate surrogate)
    {
        return new Point3D(surrogate.X, surrogate.Y, surrogate.Z);
    }

    public static implicit operator Point3DSurrogate(Point3D point)
    {
        return new Point3DSurrogate(point.X, point.Y, point.Z);
    }
}

然后在启动时仅在protobuf-net中注册一次，如下所示:

And then register it with protobuf-net just once on startup like so:

ProtoBuf.Meta.RuntimeTypeModel.Default.Add(typeof(Point3D), false).SetSurrogate(typeof(Point3DSurrogate));

或者，对于选项3，可以在启动时为Point3D定义合同，如下所示:

Alternatively, for option 3, in startup you could define a contract for Point3D like so:

ProtoBuf.Meta.RuntimeTypeModel.Default.Add(typeof(Point3D), true);
ProtoBuf.Meta.RuntimeTypeModel.Default[typeof(Point3D)].Add(1, "X").Add(2, "Y").Add(3, "Z");

(在我看来，尽管需要更多代码，但代理更清晰；完全在运行时定义协议似乎太麻烦了.)

(In my opinion the surrogate is clearer despite requiring more code; defining the protocol entirely in runtime seems too fiddly.)

我不建议使用选项1，因为您需要将代理属性添加到所有使用Point3D的类中.

I don't recommend option 1 since you would need to add proxy properties to all classes that use Point3D.

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