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?
If the mAge
xml 文件中不存在属性,我想使用默认值 18。这可能吗?
[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; }
};
编辑以放置答案。
[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
}
}
您可以使用[关于反序列化] http://msdn.microsoft.com/en-us/library/system.runtime.serialization.ondeserializedattribute.aspx
使用 OnDeserializedAttribute当您需要修复某个值时
反序列化后的对象和之前
返回图表。
[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:来自您的评论
对于 bool 或 int 你可以使用可为空 bool 和可为空 int http://msdn.microsoft.com/en-us/library/system.runtime.serialization.ondeserializedattribute.aspx因此,如果 xml 文件中缺少这些“age”和“Single”属性,那么它们也将为 null。
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();
}
}
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