是否可以在Windows Phone 7/8上使用protobuf-net对不可变类型进行序列化/反序列化? [英] Is it possible to serialize/deserialize immutable types with protobuf-net on Windows Phone 7/8?

问题描述

是否可以在Windows Phone 7/8上使用protobuf-net序列化/反序列化类型?
我尝试了下面的代码，似乎不支持构造函数跳过(即UseConstructor = false)，所以我创建了无参数构造函数，但反序列化失败，并出现尝试访问该方法失败:Wp7Tests.ImmutablePoint.set_X(System.Double )"

Is it possible to serialize/deserialize types with protobuf-net on Windows Phone 7/8?
I've tried the code below, it seems Constructor skipping isn't supported (i.e. UseConstructor = false) so I created a parameterless constructor but the deserialization fails with "Attempt to access the method failed: Wp7Tests.ImmutablePoint.set_X(System.Double)"

public class ImmutablePoint
{
    public double X { get; private set; }
    public double Y { get; private set; }
    public ImmutablePoint() {}

    public ImmutablePoint(double x, double y)
    {
        X = x;
        Y = y;
    }
}
public sub Test()
{
        ImmutablePoint pt = new ImmutablePoint(1, 2);
        var model = TypeModel.Create();
        var ptType = model.Add(typeof(ImmutablePoint), false);
        ptType.AddField(1, "X");
        ptType.AddField(2, "Y");
        IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication();

        using (var stream1 = new IsolatedStorageFileStream("test.bin", FileMode.Create, store))
        {
            try
            {
                model.Serialize(stream1, pt);
            }
            catch (Exception e)
            {                    
                Debugger.Break();
            }
        }
        const double EPSILON = 0.001;
        using (var stream1 = new IsolatedStorageFileStream("test.bin", FileMode.Open, store))
        {
            try
            {
                ImmutablePoint ptDeSer = (ImmutablePoint) model.Deserialize(stream1,null, typeof(ImmutablePoint));
                Debug.Assert(Math.Abs(pt.X - ptDeSer.X) < EPSILON);
                Debug.Assert(Math.Abs(pt.Y - ptDeSer.Y) < EPSILON);
            }
            catch (Exception e)
            {
                Debugger.Break();
            }
        }
}

推荐答案

您可以使用代理；这里我用属性装饰它，但是也可以手动配置它:

You can use a surrogate; here I'm decorating it with attributes, but it can be configured manually too:

[ProtoContract]
public class MutablePoint {
    [ProtoMember(1)] public double X { get; set; }
    [ProtoMember(2)] public double Y { get; set; }

    public static implicit operator MutablePoint(ImmutablePoint value) {
        return value == null ? null : new MutablePoint {X=value.X, Y=value.Y};
    }
    public static implicit operator ImmutablePoint(MutablePoint value) {
        return value == null ? null : new ImmutablePoint(value.X, value.Y);
    }
}

，然后告诉模型在看到ImmutablePoint时使用它:

and then tell the model to use this whenever it sees ImmutablePoint:

var model = TypeModel.Create();
model.Add(typeof(MutablePoint), true);
model.Add(typeof(ImmutablePoint), false).SetSurrogate(typeof(MutablePoint));

序列化程序将根据需要使用运算符在它们之间进行切换.序列化程序将使用implicit或explicit自定义转换运算符.

The serializer will use the operators to switch between them as necessary. The serializer will use either implicit or explicit custom conversion operators.

像这样反序列化

ImmutablePoint ptDeSer = (ImmutablePoint)model.Deserialize(stream1, null, typeof(ImmutablePoint));

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