使用 protobuf-net 合并 Collection 属性对象

Question

尝试使用 protobuf-net Merge 保存和恢复对象。 我可以让简单的对象工作，但我无法让集合属性对象合并。 感谢 protobuf-net 专家的任何帮助。

working code:

using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.Serialization;
using ProtoBuf;
class Program
{
    static void Main(string[] args)
    {
        ChildTest();
        ParentTest();

        Console.Write("Press any key to continue...");
        Console.ReadKey();
    }

    private static void ChildTest()
    {
        Console.WriteLine("ChildTest:");
        var child = new Child() {Name = "OriginalName"};

        var stream = new MemoryStream();
        Serializer.Serialize(stream, child);
        var tempChild = Serializer.Deserialize<Child>(new MemoryStream(stream.ToArray()));
        tempChild.Name = "MergedName";

        var stream1 = new MemoryStream();
        Serializer.Serialize(stream1, tempChild);
        child = Serializer.Deserialize<Child>(new MemoryStream(stream1.ToArray()));
        Console.WriteLine(child.Name + " - MergedName as expected");
    }

    private static void ParentTest()
    {
        Console.WriteLine("ParentTest:");
        var child = new Child() {Name = "OriginalName"};
        var parent = new Parent {Items = new List<Child>(1)};
        parent.Items.Add(child);

        var stream = new MemoryStream();
        Serializer.Serialize(stream,parent);
        var tempParent = Serializer.Deserialize<Parent>(new MemoryStream(stream.ToArray()));
        tempParent.Items[0].Name = "MergedName";

        var stream1 = new MemoryStream();
        Serializer.Serialize(stream1, tempParent);
        parent = Serializer.Merge(new MemoryStream(stream1.ToArray()), parent);
        Console.WriteLine(parent.Items[0].Name + " - MergedName expected here");

        Parent nullParent = null;
        nullParent = Serializer.Merge(new MemoryStream(stream1.ToArray()), nullParent);
        Console.WriteLine(nullParent.Items[0].Name+ " - MergedName as expected for null");
    }
}

[ProtoContract] //, ProtoInclude(2, typeof(Child[]))
public partial class Parent : ISerializable
{
    public Parent() { }

    [ProtoMember(1)]
    public List<Child> Items { get; set; }

    protected Parent(SerializationInfo info, StreamingContext context)
    {
        Serializer.Merge<Parent>(info, this);
    }
    public void GetObjectData(SerializationInfo info, StreamingContext context)
    {
        Serializer.Serialize(info, this);
    }
}

[ProtoContract]
public partial class Child : ISerializable
{
    public Child() { }

    [ProtoMember(1)]
    public string Name { get; set; }

    protected Child(SerializationInfo info, StreamingContext context)
    {
        Serializer.Merge<Child>(info, this);
    }
    public void GetObjectData(SerializationInfo info, StreamingContext context)
    {
        Serializer.Serialize(info, this);
    }
}

显然，protobuf-net 无法做到这一点， - 有什么方法可以做我想做的事情吗？即覆盖重复的属性？也许是另一个图书馆？

Answer 1

这是预期的功能；合并 singular 属性确实会用合并流中的值覆盖属性；但是，对于 repeated 属性（列表、数组等），行为（根据更广泛的“protobuf”系列实现）是从合并流到列表。

你会发现：

    Console.WriteLine(parent.Items[0].Name); // prints OriginalName
    Console.WriteLine(parent.Items[1].Name) // prints MergedName

具体来说，它不按位置逐项合并。