将 XML 反序列化为对象最终会得到所有空值
本文关键字：空值 反序列化 XML 对象 | 更新日期: 2023-09-27 18:36:15
我正在编写一个C#库来使用一个名为PubMed的服务。这是由NIH运营的公共服务，适合好奇的人。
我正在使用的服务 URL 在这里。
所以我把DTD拉下来，用VS2010生成XSD。然后我使用 xsd.exe 生成一个 C# 类（如下所示）。
using System;
using System.CodeDom.Compiler;
using System.ComponentModel;
using System.Diagnostics;
using System.Xml.Serialization;
namespace PubMedSearch
{
//------------------------------------------------------------------------------
// <auto-generated>
// This code was generated by a tool.
// Runtime Version:4.0.30319.42000
//
// Changes to this file may cause incorrect behavior and will be lost if
// the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------
//
// This source code was auto-generated by xsd, Version=4.0.30319.1.
//
/// <remarks />
[GeneratedCode("xsd", "4.0.30319.1")]
[Serializable]
[DebuggerStepThrough]
[DesignerCategory("code")]
[XmlType(AnonymousType = true, Namespace = "http://tempuri.org/esearch")]
[XmlRoot(Namespace = "http://tempuri.org/esearch", IsNullable = false)]
public class eSearchResult
{
private ErrorList errorListField;
private ItemsChoiceType[] itemsElementNameField;
private object[] itemsField;
private WarningList warningListField;
/// <remarks />
[XmlElement("Count", typeof (string))]
[XmlElement("ERROR", typeof (string))]
[XmlElement("IdList", typeof (IdList))]
[XmlElement("QueryKey", typeof (string))]
[XmlElement("QueryTranslation", typeof (string))]
[XmlElement("RetMax", typeof (string))]
[XmlElement("RetStart", typeof (string))]
[XmlElement("TranslationSet", typeof (TranslationSet))]
[XmlElement("TranslationStack", typeof (TranslationStack))]
[XmlElement("WebEnv", typeof (string))]
[XmlChoiceIdentifier("ItemsElementName")]
public object[] Items
{
get { return itemsField; }
set { itemsField = value; }
}
/// <remarks />
[XmlElement("ItemsElementName")]
[XmlIgnore]
public ItemsChoiceType[] ItemsElementName
{
get { return itemsElementNameField; }
set { itemsElementNameField = value; }
}
/// <remarks />
public ErrorList ErrorList
{
get { return errorListField; }
set { errorListField = value; }
}
/// <remarks />
public WarningList WarningList
{
get { return warningListField; }
set { warningListField = value; }
}
}
/// <remarks />
[GeneratedCode("xsd", "4.0.30319.1")]
[Serializable]
[DebuggerStepThrough]
[DesignerCategory("code")]
[XmlType(AnonymousType = true, Namespace = "http://tempuri.org/esearch")]
[XmlRoot(Namespace = "http://tempuri.org/esearch", IsNullable = false)]
public class IdList
{
private string[] idField;
/// <remarks />
[XmlElement("Id")]
public string[] Id
{
get { return idField; }
set { idField = value; }
}
}
/// <remarks />
[GeneratedCode("xsd", "4.0.30319.1")]
[Serializable]
[DebuggerStepThrough]
[DesignerCategory("code")]
[XmlType(AnonymousType = true, Namespace = "http://tempuri.org/esearch")]
[XmlRoot(Namespace = "http://tempuri.org/esearch", IsNullable = false)]
public class TranslationSet
{
private Translation[] translationField;
/// <remarks />
[XmlElement("Translation")]
public Translation[] Translation
{
get { return translationField; }
set { translationField = value; }
}
}
/// <remarks />
[GeneratedCode("xsd", "4.0.30319.1")]
[Serializable]
[DebuggerStepThrough]
[DesignerCategory("code")]
[XmlType(AnonymousType = true, Namespace = "http://tempuri.org/esearch")]
[XmlRoot(Namespace = "http://tempuri.org/esearch", IsNullable = false)]
public class Translation
{
private string fromField;
private string toField;
/// <remarks />
public string From
{
get { return fromField; }
set { fromField = value; }
}
/// <remarks />
public string To
{
get { return toField; }
set { toField = value; }
}
}
/// <remarks />
[GeneratedCode("xsd", "4.0.30319.1")]
[Serializable]
[DebuggerStepThrough]
[DesignerCategory("code")]
[XmlType(AnonymousType = true, Namespace = "http://tempuri.org/esearch")]
[XmlRoot(Namespace = "http://tempuri.org/esearch", IsNullable = false)]
public class TranslationStack
{
private object[] itemsField;
/// <remarks />
[XmlElement("OP", typeof (string))]
[XmlElement("TermSet", typeof (TermSet))]
public object[] Items
{
get { return itemsField; }
set { itemsField = value; }
}
}
/// <remarks />
[GeneratedCode("xsd", "4.0.30319.1")]
[Serializable]
[DebuggerStepThrough]
[DesignerCategory("code")]
[XmlType(AnonymousType = true, Namespace = "http://tempuri.org/esearch")]
[XmlRoot(Namespace = "http://tempuri.org/esearch", IsNullable = false)]
public class TermSet
{
private string countField;
private string explodeField;
private string fieldField;
private string termField;
/// <remarks />
public string Term
{
get { return termField; }
set { termField = value; }
}
/// <remarks />
public string Field
{
get { return fieldField; }
set { fieldField = value; }
}
/// <remarks />
public string Count
{
get { return countField; }
set { countField = value; }
}
/// <remarks />
public string Explode
{
get { return explodeField; }
set { explodeField = value; }
}
}
/// <remarks />
[GeneratedCode("xsd", "4.0.30319.1")]
[Serializable]
[XmlType(Namespace = "http://tempuri.org/esearch", IncludeInSchema = false)]
public enum ItemsChoiceType
{
/// <remarks />
Count,
/// <remarks />
ERROR,
/// <remarks />
IdList,
/// <remarks />
QueryKey,
/// <remarks />
QueryTranslation,
/// <remarks />
RetMax,
/// <remarks />
RetStart,
/// <remarks />
TranslationSet,
/// <remarks />
TranslationStack,
/// <remarks />
WebEnv
}
/// <remarks />
[GeneratedCode("xsd", "4.0.30319.1")]
[Serializable]
[DebuggerStepThrough]
[DesignerCategory("code")]
[XmlType(AnonymousType = true, Namespace = "http://tempuri.org/esearch")]
[XmlRoot(Namespace = "http://tempuri.org/esearch", IsNullable = false)]
public class ErrorList
{
private string[] fieldNotFoundField;
private string[] phraseNotFoundField;
/// <remarks />
[XmlElement("PhraseNotFound")]
public string[] PhraseNotFound
{
get { return phraseNotFoundField; }
set { phraseNotFoundField = value; }
}
/// <remarks />
[XmlElement("FieldNotFound")]
public string[] FieldNotFound
{
get { return fieldNotFoundField; }
set { fieldNotFoundField = value; }
}
}
/// <remarks />
[GeneratedCode("xsd", "4.0.30319.1")]
[Serializable]
[DebuggerStepThrough]
[DesignerCategory("code")]
[XmlType(AnonymousType = true, Namespace = "http://tempuri.org/esearch")]
[XmlRoot(Namespace = "http://tempuri.org/esearch", IsNullable = false)]
public class WarningList
{
private string[] outputMessageField;
private string[] phraseIgnoredField;
private string[] quotedPhraseNotFoundField;
/// <remarks />
[XmlElement("PhraseIgnored")]
public string[] PhraseIgnored
{
get { return phraseIgnoredField; }
set { phraseIgnoredField = value; }
}
/// <remarks />
[XmlElement("QuotedPhraseNotFound")]
public string[] QuotedPhraseNotFound
{
get { return quotedPhraseNotFoundField; }
set { quotedPhraseNotFoundField = value; }
}
/// <remarks />
[XmlElement("OutputMessage")]
public string[] OutputMessage
{
get { return outputMessageField; }
set { outputMessageField = value; }
}
}
}
它看起来与XML不太匹配，但我是新手，所以我试一试。我使用此代码发出请求：
var request = WebRequest.Create(url);
var response = request.GetResponse();
var stream = response.GetResponseStream();
var deserializer = new XmlSerializer(typeof(eSearchResult), new XmlRootAttribute("eSearchResult"));
var result = (eSearchResult)deserializer.Deserialize(stream);
结果最终以空属性和字段结束。我真的有点在黑暗中工作。我按照我能够找到的信息进行操作，并不断得到相同的结果。任何建议将不胜感激。
传入的 XML 没有在生成的代码中列出的命名空间。 将命名空间添加到收到的 XML 将允许对其进行反序列化。
var request = WebRequest.Create(url);
var response = request.GetResponse();
var stream = response.GetResponseStream();
var result = new eSearchResult();
try
{
MemoryStream XmlStream = new MemoryStream();
XmlDocument MyDoc = new XmlDocument();
MyDoc.Load(stream);
XmlAttribute AddNamespace = MyDoc.CreateAttribute("xmlns");
AddNamespace.Value = "http://tempuri.org/esearch";
MyDoc.LastChild.Attributes.Append(AddNamespace);
MyDoc.Save(XmlStream);
XmlStream.Position = 0;
result = (eSearchResult)deserializer.Deserialize(XmlStream);
}
catch (Exception Error)
{ }