20

有没有办法在反序列化期间选择不在 xml 文件中的属性的默认值？
如果mAgexml 文件中不存在该属性，我想使用默认值 18。可以吗？

[DataContract]
public class Person 
{
    public Person ()
    {
    }
    [DataMember(Name = "Name")]
    public string mName { get; set; }
    [DataMember(Name = "Age")]
    public int mAge { get; set; }
    [DataMember(Name = "Single")]
    public bool mIsSingle { get; set; }
};

编辑以给出答案。

[DataContract]
public class Person 
{
    public Person ()
    {
    }
    [DataMember(Name = "Name")]
    public string mName { get; set; }
    [DataMember(Name = "Age")]
    public int? mAge { get; set; }
    [DataMember(Name = "Single")]
    public bool? mIsSingle { get; set; }

    [System.Runtime.Serialization.OnDeserialized]
    void OnDeserialized(System.Runtime.Serialization.StreamingContext c)
    {
        mAge = (mAge == null ? 18 : mAge); // 18 is the default value
    }
}
4

3 回答 3

21

您可以使用[OnDeserialized]

当您需要在反序列化后和返回图形之前修复反序列化对象的值时，请使用 OnDeserializedAttribute 。

[DataContract]
 public class Person 
  {
    public Person ()
    {
    }
    [DataMember(Name = "Name")]
    public string mName { get; set; }
    [DataMember(Name = "Age")]
    public int mAge { get; set; }
    [DataMember(Name = "Single")]
    public bool mIsSingle { get; set; }



    [System.Runtime.Serialization.OnDeserialized]
    void OnDeserialized(System.Runtime.Serialization.StreamingContext c)
    {
      mAge = (mAge == 0) ?18:mAge;
    }
  }
}

编辑：根据您的评论

对于 bool 或 int，您可以使用可为空的 bool 和可为空的 int ，因此如果 xml 文件中缺少这些年龄和 Single 属性，那么它们也将为空。

这是我准备的快速样本

using System.Runtime.Serialization;
using System.ServiceModel;
using MySpace;
using System.ServiceModel.Channels;
using System;
namespace MySpace
{

 [DataContract]
 public class Person 
  {
    public Person ()
    {
    }
    [DataMember(Name = "Name")]
    public string mName { get; set; }
    [DataMember(Name = "Age")]
    public int? mAge { get; set; }
    [DataMember(Name = "Single")]
    public bool? mIsSingle { get; set; }



    [System.Runtime.Serialization.OnDeserialized]
    void OnDeserialized(System.Runtime.Serialization.StreamingContext c)
    {
      mAge =  (mAge == null ? 18 : mAge);
    }
  }
}
[ServiceContract]
public interface IService
{
  [OperationContract]
  Person Method(Person dd);
}

public class Service : IService
{
  public Person Method(Person dd)
  {
    return dd;
  }
}

class Program
{
  static void Main(string[] args)
  {
    string Url = "http://localhost:8000/";
    Binding binding = new BasicHttpBinding();
    ServiceHost host = new ServiceHost(typeof(Service));
    host.AddServiceEndpoint(typeof(IService), binding, Url);
    host.Open();
    ChannelFactory<IService> fac = new ChannelFactory<IService>(binding);
    fac.Open();
    IService proxy = fac.CreateChannel(new EndpointAddress(Url));
    Person d = new Person();
    d.mName = "BuzBuza";

    Console.WriteLine("Data before calling service " + (d.mAge == null ? " null " : d.mAge.Value.ToString()));
    Console.WriteLine("Data before calling service " + (d.mIsSingle == null ? "null" : d.mIsSingle.Value.ToString()));
    d = proxy.Method(d);
    fac.Close();
    host.Close();
    Console.WriteLine("Data after calling service " + (d.mAge == null ? " null " : d.mAge.Value.ToString()));
    Console.WriteLine("Data after calling service " + (d.mIsSingle == null ? "null" : d.mIsSingle.Value.ToString()));

    Console.ReadLine();
  }
}
于 2011-12-19T20:27:09.847 回答
7

使用[OnDeserializing()]

并且您在反序列化之前设置您的值。所以没有必要的检查，这可能会出错——如果mage被序列化为0怎么办？

于 2015-04-22T20:51:04.307 回答
1

这应该有效。

[DataContract]
 public class Person 
  {
    public Person ()
    {
    }
    [DataMember(Name = "Name")]
    public string mName { get; set; }
    [DataMember(Name = "Age")]
    public int mAge = 18;
    [DataMember(Name = "Single")]
    public bool mIsSingle { get; set; }
  };

看看这个页面。

于 2011-12-19T19:16:14.597 回答