C＃Serialize to XML - 有时会出现String属性？ [英] C# Serialize to XML - String properties sometimes appear?

问题描述

我认为我在C＃序列化理解中遗漏了一些东西。



我正在将一个C＃类序列化为XML，以便通过Web服务进行传输。为简单起见，我有一个只有三个属性的类：

  public   partial   class  MyInfo：SerializableObject 
 {
  private   string  ssnField; 
  private   string  suffixField; 
  private  integer suffixIDField; 
 
  public  MyInfo（）
 {
  this  .ssnField =  string  .Empty; 
  this  .suffixField =  string  .Empty; 
  this  .suffixIDField =  0 ; 
} 
 
  public   string  SSN 
 {
 获取 {返回 此。 ssnField; } 
  set  {此 .ssnField =  value ; } 
} 
 
  public   string 后缀
 { 
 获取 {返回 此 .suffixField; } 
  set  { this  .suffixField =  value ; } 
} 
 
  public 整数SuffixID 
 {
  get  { return   this  .suffixIDField; } 
  set  { this  .suffixIDField =  value ; } 
} 
} 

这里是串行器的主旨：

 使用（XmlTextWriter xmlTextWriter =  new  XmlTextWriter（memoryStream，Encoding .UTF8）{Formatting = Formatting.Indented}）
 {
 xmlSerializer.Serialize（xmlTextWriter， this ）; 
 memoryStream =（MemoryStream）xmlTextWriter.BaseStream; 
 xmlText =  new  UTF8Encoding（）。GetString（memoryStream.ToArray（））; 
 memoryStream.Dispose（）; 
} 

这里是我的输出：SSN或Suffix都没有设置超出string.empty调用。 SSN出现在XML中，后缀则没有出现。谁知道为什么？

 <   SSN     /  >  
 <  后缀ID  >  0 <   / SuffixID  >  

我不想传递空字段（如后缀）但我会解决知道为什么一个出现，一个不出现。



非常感谢。

解决方案

我找到了回答！这是一个缺少的描述符：

 [XmlElement（IsNullable = true）] 
 public string SSN 

I think I''m missing something in my C# Serialization understanding.

I am serializing a C# class to XML to transfer across a web service. For simplicity''s sake, I have a class with only three properties:

public partial class MyInfo : SerializableObject
{
   private string ssnField;
   private string suffixField;
   private integer suffixIDField;

   public MyInfo()
   {
      this.ssnField = string.Empty;
      this.suffixField = string.Empty;
      this.suffixIDField = 0;
   }

   public string SSN
   {
      get { return this.ssnField; }
      set { this.ssnField = value; }
   }
	
   public string Suffix
   {
      get { return this.suffixField; }
      set { this.suffixField = value; }
   }
   
   public integer SuffixID
   {
      get { return this.suffixIDField; }
      set { this.suffixIDField = value; }
   }
}

And here''s the gist of the serializer:

using (XmlTextWriter xmlTextWriter = new XmlTextWriter(memoryStream, Encoding.UTF8) { Formatting = Formatting.Indented })
{
   xmlSerializer.Serialize(xmlTextWriter, this);						
   memoryStream = (MemoryStream)xmlTextWriter.BaseStream;				
   xmlText = new UTF8Encoding().GetString(memoryStream.ToArray());
   memoryStream.Dispose();
}

And here''s my output: Neither SSN or Suffix get set beyond the string.empty call. SSN shows up in the XML, Suffix does not. Anyone know why?

<SSN />
<SuffixID>0</SuffixID>

I''d prefer to not pass empty fields (like Suffix) but I''d settle to know why one appears, and one does not.

Thanks much.

解决方案

I found the answer! It was an missing descriptor:

[XmlElement(IsNullable = true)]
public string SSN

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