c# - protobuf-net 不使用私有(private) setter 序列化 C# 属性

Question

我今天一直在研究 protobuf-net，遇到了一个奇怪的情况。下面的代码没有按预期反序列化。最后两次反序列化尝试成功，但它们不正确。反序列化对象将 IsEmpty 设置为 true，而实际上应将其设置为 false。我已经能够使用私有(private) setter 获取属性以进行序列化，但这个行为不正确。它与链式默认构造函数有关吗？

class Program2
{
    static void Main(string[] args)
    {
        var comp = new FooComparer();

        // this deserializes fine.  woot!
        using (var ms = new MemoryStream())
        {
            Console.WriteLine("Serializing an empty Foo");
            var args1 = new Foo();
            Serializer.Serialize(ms, args1);
            ms.Position = 0;
            var result = Serializer.Deserialize(ms);
            Console.WriteLine("Serialization successful: {0}", comp.Equals(args1, result));
            Console.WriteLine();
        }

        // this deserializes incorrectly
        using (var ms = new MemoryStream())
        {
            Console.WriteLine("Serializing a Foo with just a string");
            var args1 = new Foo("576000BJ1");
            Serializer.Serialize(ms, args1);
            ms.Position = 0;
            var result = Serializer.Deserialize(ms);
            Console.WriteLine("Serialization successful: {0}", comp.Equals(args1, result));
            Console.WriteLine();
        }

        // this deserializes incorrectly
        using (var ms = new MemoryStream())
        {
            Console.WriteLine("Serializing a Foo with an int");
            var args1 = new Foo(42);
            Serializer.Serialize(ms, args1);
            ms.Position = 0;
            var result = Serializer.Deserialize(ms);
            Console.WriteLine("Serialization successful: {0}", comp.Equals(args1, result));
            Console.WriteLine();
        }

        Console.WriteLine("Got dat 190% serialization");
    }
}

[ProtoContract]
class Foo
{
    private Foo(bool isEmpty, string fooString, int? fooInt)
    {
        this.IsEmpty = isEmpty;
        this.FooString = fooString;
        this.FooInt = fooInt;
    }

    public Foo() : this(true, null, null) { }
    public Foo(string foo) : this(false, foo, null) { }
    public Foo(int foo) : this(false, null, foo) { }

    [ProtoMember(10)] public bool IsEmpty { get; private set; }
    [ProtoMember(20)] public string FooString { get; private set; }
    [ProtoMember(30)] public int? FooInt { get; private set; }
}

class FooComparer : IEqualityComparer
{
    public bool Equals(Foo x, Foo y)
    {
        return (x == null && y == null) ||
                (x != null && y != null &&
                x.IsEmpty == y.IsEmpty &&
                String.Equals(x.FooString, y.FooString, StringComparison.Ordinal) &&
                x.FooInt == y.FooInt);
    }

    public int GetHashCode(Foo obj) { return 1; }   // don't care about this
}

编辑:我正在使用 .NET 3.5 和 protobuf 2.0.0.666

Answer 1

这是隐含的默认值行为。最简单的修复可能是用 IsRequired=true 标记 IsEmpty(在 property 属性上)。