在我的两门课程中,看起来像这样(最少)
using System;
using System.Collections.Generic;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
using System.IO;
using ProtoBuf;
namespace Sandbox
{
public partial class Form1 : Form
{
public Form1()
{
Family family = new Family();
Child child1 = new Child(1);
Child child2 = new Child(2);
Parent parent = new Parent(new List<Child>() { child1, child2 });
family.Add(parent);
string file = "sandbox.txt";
try { File.Delete(file); } catch { }
using (var fs = File.OpenWrite(file)) { Serializer.Serialize(fs, family); }
using (var fs = File.OpenRead(file)) { family = Serializer.Deserialize<Family>(fs); }
System.Diagnostics.Debug.Assert(family != null, "1. Expect family not null, but not the case.");
}
}
[ProtoContract()]
public class Child
{
[ProtoMember(1, AsReference = true)]
internal Parent Parent;
private Child() { }
public Child(int i) { }
}
[ProtoContract()]
public class Parent
{
[ProtoMember(1)]
protected List<Child> m_Children;
/// <summary>
/// ProtoBuf deserialization constructor (fails here)
/// </summary>
private Parent() { m_Children = new List<Child>(); }
public Parent(List<Child> children)
{
m_Children = children;
m_Children.ForEach(x => x.Parent = this);
}
}
[ProtoContract()]
public class Family
{
[ProtoMember(1)]
protected List<Parent> m_Parents;
public void Add(Parent parent)
{
m_Parents.Add(parent);
}
public Family()
{
m_Parents = new List<Parent>();
}
}
}
在反序列化期间,我遇到异常“没有为此对象定义无参数构造函数”。用于在ProtoBuf.BclHelper附近创建Parent对象
case FieldObject:
// ...
value = ((options & NetObjectOptions.UseConstructor) == 0) ? BclHelpers.GetUninitializedObject(type) : Activator.CreateInstance(type);
然后,当我将默认构造函数 Parent() 更改为 public 时,异常消失了。
知道我可能忽略了在这种情况下 AsReference 的正确用法吗?
BOUNTY:
虽然 Marc 花时间解决这个问题,但我需要一个明确的解决方案来在这种情况下使用 protobuf-net,通过 protobuf-net 属性、方法或其他技巧来解决。否则我将不得不完全放弃使用 protobuf-net。谢谢你的帮助。
我相信你可以这样做来解决这个问题:
[ProtoContract(SkipConstructor = true)]
public class Parent
{
[ProtoMember(1)]
protected List<Child> m_Children;
private Parent() { Initialize(); }
[ProtoBeforeDeserialization] // could also use OnDeserializing
private void Initialize()
{
m_Children = new List<Child>();
}
public Parent(List<Child> children)
{
m_Children = children;
m_Children.ForEach(x => x.Parent = this);
}
}
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