如何在C#反序列化期间进行引用修复?
如何使用C#序列化框架引用修复(后处理)?
我有一个对象图,其中的对象引用其他对象.它们都实现了ISerializable接口,并且它们都具有实例ID,因此在序列化状态下表示引用很容易. krux是当调用??反序列化构造函数时,该对象引用的所有对象可能都没有被反序列化,因此引用不能设置为有效对象.我找不到任何方法可以挂钩C#序列化框架中的后处理步骤来进行参考修复.有办法吗? 根据要求,这是一个人为的课程,我认为突出了问题. [Serializable] public class Pony : ISerializable { public int Id { get; set; } public string Name { get; set; } public Pony BFF { get; set; } public Pony() {} private Pony(SerializationInfo info,StreamingContext context) { Id = info.GetInt32("id"); Name = info.GetString("name"); var bffId = info.GetInt32("BFFId"); BFF = null; // <===== Fixup! Find Pony instance with id == bffId } public void GetObjectData(SerializationInfo info,StreamingContext ontext) { info.AddValue("id",Id); info.AddValue("name",Name); info.AddValue("BFFId",BFF.Id); } } 这是(de)序列化代码: var rd = new Pony { Id = 1,Name = "Rainbow Dash" }; var fs = new Pony { Id = 2,Name = "Fluttershy",BFF = rd }; rd.BFF = fs; var ponies = new List<Pony>{ rd,fs }; Stream stream = new MemoryStream(); var formatter = new BinaryFormatter(); formatter.Serialize(stream,ponies); stream.Seek(0,SeekOrigin.Begin); var deserializedPonies = (List<Pony>)formatter.Deserialize(stream); 这个问题没有解决我的问题:.net XML Serialization – Storing Reference instead of Object Copy 我想使用BinaryFormatter ISerializable框架进行序列化,而不是切换到XmlFormater. 解决方法
为此目的有一个属??性.
在要反序列化的任何对象中实现以下方法: [OnDeserialized] internal void OnDeserializedMethod(StreamingContext context) { } System.Runtime.Serialization中还有一些属性可能会对您有所帮助. 编辑 我稍微修改了你的代码: [Serializable] public class Pony { public int Id { get; set; } public string Name { get; set; } public Pony BFF { get; set; } public Pony() { } [OnDeserialized] internal void OnDeserializedMethod(StreamingContext context) { Console.WriteLine(this.Id + " " + this.Name + " " + this.BFF?.Name); } } 测试方法: var rd = new Pony { Id = 1,Name = "Rainbow Dash" }; var fs = new Pony { Id = 2,BFF = rd }; rd.BFF = fs; var ponies = new List<Pony> { rd,fs }; object returnValue; using (var memoryStream = new MemoryStream()) { var binaryFormatter = new BinaryFormatter(); binaryFormatter.Serialize(memoryStream,ponies); memoryStream.Position = 0; returnValue = binaryFormatter.Deserialize(memoryStream); } var xx = (List<Pony>)returnValue; 如您所见,我删除了ISerializable接口,私有构造函数和GetObjectData – Method. 我做到了,因为我不认为你真的需要它,因为你没有说,你已经实现了(De)序列化. This帖子是另一个信息来源 编辑2(Testmethod保持不变): 方法一(完全反序列化和序列化) private Pony(SerializationInfo info,StreamingContext context) { foreach (SerializationEntry entry in info) { switch (entry.Name) { case "Id": this.Id = (int)entry.Value; break; case "Name": this.Name = (string)entry.Value; break; case "BFF": this.BFF = (Pony)entry.Value; break; } } } public void GetObjectData(SerializationInfo info,StreamingContext ontext) { info.AddValue("Id",Id); info.AddValue("Name",Name); info.AddValue("BFF",BFF); } } … 方法2(递归对象 – 仅限Id): … private Pony(SerializationInfo info,StreamingContext context) { foreach (SerializationEntry entry in info) { switch (entry.Name) { case "Id": this.Id = (int)entry.Value; break; case "Name": this.Name = (string)entry.Value; break; case "BFF.Id": var bffId = (int)entry.Value; this.BFF = GetPonyById(bffId); // You have to implement this break; } } } public void GetObjectData(SerializationInfo info,Name); info.AddValue("BFF.Id",BFF.Id); } … (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |