Question

我今天一直在使用protobuf-net，并且遇到了奇怪的情况。下面的代码不会按预期反序列化。最后两次反序列化尝试成功，但它们不正确。当反序列化对象实际应设置为true时，将IsEmpty设置为false。我已经能够获得私人制定者的属性来序列化很好，但这一个表现不正常。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：我正在使用带有protobuf 2.0.0.666的.NET 3.5

Answer 1

这是隐式默认值行为。最简单的修复可能是使用IsRequired = true标记IsEmpty（在属性属性上）。

Answer 2

在这里找到答案：c# protobuf-net when deserialize the some property value always is -1

为了节省空间，protobuf不会为值类型序列化默认值。在此示例中，bool的.NET默认值为false。默认构造函数将IsEmpty属性设置为true，并且由于我期望它具有的值与.NET默认值相同，因此protobuf会跳过保存该值，因此我从中获取值默认构造函数。

修复方法是将IsRequired设置为TRUE，如Marc所说，或者在参数上使用[ProtoContract(10), DefaultValue(true)]。

protobuf-net没有使用私有setter序列化C＃属性

2 个答案: