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C# 反序列化错误：XML元素'；名称'；从名称空间''；已存在于当前作用域中

c# xml serialization

C# 反序列化错误：XML元素'；名称'；从名称空间''；已存在于当前作用域中,c#,xml,serialization,xml-serialization,C#,Xml,Serialization,Xml Serialization,这是我第一次使用XML序列化，经过两天的尝试解决这个问题，这让我非常恼火 当反序列化开始时，我会出现以下错误： The XML element 'name' from namespace '' is already present in the current scope. Use XML attributes to specify another XML name or namespace for the element. 错误发生在我的代码中的这一行： Album album = (Alb

这是我第一次使用XML序列化，经过两天的尝试解决这个问题，这让我非常恼火

当反序列化开始时，我会出现以下错误：

The XML element 'name' from namespace '' is already present in the current scope. Use XML attributes to specify another XML name or namespace for the element.
错误发生在我的代码中的这一行：

Album album = (Album)serializer.Deserialize(reader);
我不知道为什么。没有dup“name”节点，所以我不明白。这是从第三方REST API的HttpWebResponse接收的XML文档

以下是完整的代码：

我的唱片集类（我要反序列化的类型）：

我的序列化程序类：

    public class Serializer
    {
        public static Album CreateAlbumFromXMLDoc(XmlDocument doc)
        {
            // Create an instance of a serializer
            var serializer = new XmlSerializer(typeof(Album));
            var reader = new StringReader(doc.ToString());

            // Deserialize the Xml Object and cast to type Album
            Album album = (Album)serializer.Deserialize(reader);

            return album;
        }
    }

public static XmlDocument GetResponseXmlDocument(HttpWebResponse response)
        {
            Stream dataStream = null; // stream from WebResponse
            XmlDocument doc = new XmlDocument();

            if (doc == null)
            {
                throw new NullReferenceException("The web reponse was null");
            }

            // Get the response stream so we can read the body of the response
            dataStream = response.GetResponseStream();

            // Open the stream using a StreamReader for easy access
            StreamReader reader = new StreamReader(dataStream);

            // Load response into string variable so that we can then load into an XML doc
            string responseString = reader.ReadToEnd();

            // Create an XML document & load it with the response data
            doc.LoadXml(responseString);

            // Final XML document that represents the response
            return doc;
        }
我尝试反序列化的XML（从在VS中调试时传递到CreateAlbumFromXMLDoc方法的XML文档对象复制）：

错误发生在我的代码中的这一行：GetAlbumsResponse album=（GetAlbumsResponse）serializer.Deserialize（reader）

如何将响应转换为XmL文档：

    public class Serializer
    {
        public static Album CreateAlbumFromXMLDoc(XmlDocument doc)
        {
            // Create an instance of a serializer
            var serializer = new XmlSerializer(typeof(Album));
            var reader = new StringReader(doc.ToString());

            // Deserialize the Xml Object and cast to type Album
            Album album = (Album)serializer.Deserialize(reader);

            return album;
        }
    }

public static XmlDocument GetResponseXmlDocument(HttpWebResponse response)
        {
            Stream dataStream = null; // stream from WebResponse
            XmlDocument doc = new XmlDocument();

            if (doc == null)
            {
                throw new NullReferenceException("The web reponse was null");
            }

            // Get the response stream so we can read the body of the response
            dataStream = response.GetResponseStream();

            // Open the stream using a StreamReader for easy access
            StreamReader reader = new StreamReader(dataStream);

            // Load response into string variable so that we can then load into an XML doc
            string responseString = reader.ReadToEnd();

            // Create an XML document & load it with the response data
            doc.LoadXml(responseString);

            // Final XML document that represents the response
            return doc;
        }
我的专辑类和根级别类（感谢Marc的帮助。我现在就知道了）： 
namespace xxx.Entities
{
[可序列化，XmlRoot（“照片\u获取相册\u响应”）]
公共类GetAlbumsResponse
{
[XmlElement（“相册”）]
公共列表相册{get；set；}
[XmlAttribute（“列表”）]
公共布尔岛列表{get；set；}
}
公开课相册
{
#区域构造函数
公共相册（）
{
}
#端区
#区域元素常数
/// 
///Constants类以消除对魔术字符串（硬编码字符串）的使用
/// 
公共静态类ElementConstants
{
public const string aID=“aID”；
public const string Owner=“Owner”；
public const string AlbumName=“name”；
public const string CoverPhotoID=“cover\u pid”；
public const string CreateDate=“created”；
公共常量字符串LastModifiedDate=“已修改”；
public const string Description=“Description”；
public const string Location=“Location”；
public const string AlbumURL=“link”；
public const string Size=“Size”；
public const string Visible=“Visible”；
}
#endregion元素常量
#区域公共财产
[xmlement（ElementName=ElementConstants.aID，DataType=“string”）]
公共字符串AlbumID{get；set；}
[XmlElement（ElementName=ElementConstants.CoverPhotoID，DataType=“int”）]
公共Int32 CoverPhotoID{get；set；}
[xmlement（ElementName=ElementConstants.Owner，DataType=“string”）]
公共字符串所有者{get；set；}
[XmlElement（ElementName=ElementConstants.AlbumName，DataType=“string”）]
公共字符串名称{get；set；}
已创建公共字符串{get；set；}
修改的公共日期时间{get；set；}
[XmlElement（ElementName=ElementConstants.Description，DataType=“string”）]
公共字符串说明{get；set；}
[xmlement（ElementName=ElementConstants.Location，DataType=“string”）]
公共字符串位置{get；set；}
[XmlElement（ElementName=ElementConstants.AlbumURL，DataType=“string”）]
公共字符串链接{get；set；}
公共字符串大小{get；set；}
[XmlElement（ElementName=ElementConstants.Visible，DataType=“string”）]
公共字符串可见{get；set；}
#端区
}
}
我的序列化程序类： 
namespace xxx.Utilities
{
公共类序列化程序
{
公共静态列表CreateAlbumFromXMLDoc（XmlDocument doc）
{
//创建序列化程序的实例
var serializer=新的XmlSerializer（typeof（Album））；
var reader=newstringreader（doc.ToString（））；
//反序列化Xml对象并强制转换为类型Album
GetAlbumsResponse album=（GetAlbumsResponse）序列化程序。反序列化（读取器）；
返回相册。相册；
}
}
}
我正在尝试反序列化的真正传入XML（是的，它确实有xmlns）： 

7321990241086938677
7031990241087042549
1124262814
专辑测试1
1233469624
1233469942
我们的旅行
加利福尼亚州
http://www.example.com/album.php?aid=7733&id=1124262814
48
朋友
231990241086936240
7042330241087005994
1124262814
专辑测试2
1230437805
1233460690
http://www.example.com/album.php?aid=5296&id=1124262814
34
每个人
70319423341086937544
7032390241087026027
1124262814
专辑测试3
1231984989
1233460349
http://www.example.com/album.php?aid=6600&id=1124262814
3.
朋友
嗯

Microsoft针对您的问题发出了一个警告

是-相册绝对不是XML中的根节点

我建议您创建一个包含相册列表的GetAlbumsResponse类，并将反序列化代码移动到包装器类

基本上，从相册类定义中删除根元素，然后：

  [XmlRoot (ElementName="GetAlbums_response")]
public class GetAlbumsResponse
{
    #region Constructors

    public GetAlbumsResponse()
    {

    }

    #endregion



    [XmlArray(ElementName="album")]
    public List<Album> Albums{get;set;}

    ... deserialization code...

[XmlRoot（ElementName=“GetAlbums\u响应”）]
公共类GetAlbumsResponse
{
#区域构造函数
公共GetAlbumsResponse（）
{
}
#端区
[XmlArray（ElementName=“album”）]
公共列表相册{get；set；}
…反序列化代码。。。
}

好-我编写了一个示例。我看了一下Facebook API，下面是一个完整的工作示例。 试试这个：

[XmlRoot("photos_getAlbums_response", Namespace="http://api.facebook.com/1.0/")]
public class GetAlbumsResponse
{
    public GetAlbumsResponse() 
    {    
    }

    [XmlElement("album")]
    public List<Album> Albums { get; set; }
}

public class Album
{
    [XmlElement("aid")]
    public long Aid{get;set;}

    [XmlElement("cover_pid")]
    public long CoverPid{get;set;}

    [XmlElement("owner")]
    public long Owner{get;set;}

    [XmlElement("name")]
    public string Name{get;set;}

    [XmlElement("created")]
    public long Created{get;set;}

    [XmlElement("modified")]
    public long Modified{get;set;}

    [XmlElement("description")]
    public string Description{get;set;}

    [XmlElement("location")]
    public string Location{get;set;}

    [XmlElement("link")]
    public string Link{get;set;}

    [XmlElement("size")]
    public int Size{get;set;}

    [XmlElement("visible")]
    public string Visible{get;set;}

    public Album()
    {}
}

class XmlUtils
{
    public static T DeserializeFromXml<T>(string xml)
    {
        T result;
        XmlSerializer ser = new XmlSerializer(typeof(T));
        using (TextReader tr = new StringReader(xml))
        {
            result = (T)ser.Deserialize(tr);
        }
        return result;
    }
}

[XmlRoot（“照片”\u getAlbums\u响应”，名称空间=”http://api.facebook.com/1.0/")]
公共类GetAlbumsResponse
{
公共GetAlbumsResponse（）
{    
}
[XmlElement（“相册”）]
公共列表相册{get；set；}
}
公开课相册
{
[XmlElement（“aid”）]
公共长期援助{get；set；}
[XmlElement（“封面

namespace xxx.Utilities
{
    public class Serializer
    {
        public static List<Album> CreateAlbumFromXMLDoc(XmlDocument doc)
        {
            // Create an instance of a serializer
            var serializer = new XmlSerializer(typeof(Album));
            var reader = new StringReader(doc.ToString());

            // Deserialize the Xml Object and cast to type Album
            GetAlbumsResponse album = (GetAlbumsResponse)serializer.Deserialize(reader);

            return album.Albums;
        }
    }
}



<?xml version="1.0" encoding="UTF-8"?>
<photos_GetAlbums_response xmlns="http://api.example.com/1.0/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://api.example.com/1.0/ http://api.example.com/1.0/xxx.xsd" list="true">
  <album>
    <aid>7321990241086938677</aid>
    <cover_pid>7031990241087042549</cover_pid>
    <owner>1124262814</owner>
    <name>Album Test 1</name>
    <created>1233469624</created>
    <modified>1233469942</modified>
    <description>Our trip</description>
    <location>CA</location>
    <link>http://www.example.com/album.php?aid=7733&id=1124262814</link>
    <size>48</size>
    <visible>friends</visible>
  </album>
  <album>
    <aid>231990241086936240</aid>
    <cover_pid>7042330241087005994</cover_pid>
    <owner>1124262814</owner>
    <name>Album Test 2</name>
    <created>1230437805</created>
    <modified>1233460690</modified>
    <description />
    <location />
    <link>http://www.example.com/album.php?aid=5296&id=1124262814</link>
    <size>34</size>
    <visible>everyone</visible>
  </album>
  <album>
    <aid>70319423341086937544</aid>
    <cover_pid>7032390241087026027</cover_pid>
    <owner>1124262814</owner>
    <name>Album Test 3</name>
    <created>1231984989</created>
    <modified>1233460349</modified>
    <description />
    <location />
    <link>http://www.example.com/album.php?aid=6600&id=1124262814</link>
    <size>3</size>
    <visible>friends</visible>
  </album>
</photos_GetAlbums_response>



  [XmlRoot (ElementName="GetAlbums_response")]
public class GetAlbumsResponse
{
    #region Constructors

    public GetAlbumsResponse()
    {

    }

    #endregion



    [XmlArray(ElementName="album")]
    public List<Album> Albums{get;set;}

    ... deserialization code...



[XmlRoot("photos_getAlbums_response", Namespace="http://api.facebook.com/1.0/")]
public class GetAlbumsResponse
{
    public GetAlbumsResponse() 
    {    
    }

    [XmlElement("album")]
    public List<Album> Albums { get; set; }
}

public class Album
{
    [XmlElement("aid")]
    public long Aid{get;set;}

    [XmlElement("cover_pid")]
    public long CoverPid{get;set;}

    [XmlElement("owner")]
    public long Owner{get;set;}

    [XmlElement("name")]
    public string Name{get;set;}

    [XmlElement("created")]
    public long Created{get;set;}

    [XmlElement("modified")]
    public long Modified{get;set;}

    [XmlElement("description")]
    public string Description{get;set;}

    [XmlElement("location")]
    public string Location{get;set;}

    [XmlElement("link")]
    public string Link{get;set;}

    [XmlElement("size")]
    public int Size{get;set;}

    [XmlElement("visible")]
    public string Visible{get;set;}

    public Album()
    {}
}

class XmlUtils
{
    public static T DeserializeFromXml<T>(string xml)
    {
        T result;
        XmlSerializer ser = new XmlSerializer(typeof(T));
        using (TextReader tr = new StringReader(xml))
        {
            result = (T)ser.Deserialize(tr);
        }
        return result;
    }
}



 GetAlbumsResponse response = XmlUtils.DeserializeFromXml<GetAlbumsResponse>(xmlResponseString);



    [XmlElement (ElementName = ElementConstants.AlbumName, DataType = "string")]
    public string AlbumID { get; set; }
...
    [XmlElement(ElementName = ElementConstants.AlbumName, DataType = "string")]
    public string AlbumName { get; set; }



xsd foo.xml
xsd foo.xsd /classes



using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Xml;
using System.Xml.Serialization;

static class Program
{
    const string xml = @"<?xml version=""1.0"" encoding=""UTF-8""?>
<photos_GetAlbums_response
    xmlns:xsi=""http://www.w3.org/2001/XMLSchema-instance""
    xsi:schemaLocation=""http://api.example.com/1.0/ http://api.example.com/1.0/xxx.xsd""
    list=""true"">
<album>
 <aid>3231990241086938677</aid>
 <cover_pid>7031990241087042549</cover_pid>
 <owner>1337262814</owner>
 <name>LA</name>
 <created>1233469624</created>
 <modified>1233469942</modified>
 <description>trip to LA</description>
 <location>CA</location>
 <link>http://www.example.com/album.php?aid=7333&amp;id=1337262814</link>
 <size>48</size>
 <visible>friends</visible>
 </album>
<album>
 <aid>7031990241086936240</aid>
 <cover_pid>7031990241087005994</cover_pid>
 <owner>1337262814</owner>
 <name>Wall Photos</name>
 <created>1230437805</created>
 <modified>1233460690</modified>
 <description/>
 <location/>
 <link>http://www.example.com/album.php?aid=3296&amp;id=1337262814</link>
 <size>34</size>
 <visible>everyone</visible>
 </album>
<album>
 <aid>7031990241086937544</aid>
 <cover_pid>7031990241087026027</cover_pid>
 <owner>1337262814</owner>
 <name>Mobile Uploads</name>
 <created>1231984989</created>
 <modified>1233460349</modified>
 <description/>
 <location/>
 <link>http://www.example.com/album.php?aid=6300&amp;id=1337262814</link>
 <size>3</size>
 <visible>friends</visible>
 </album>
<album>
 <aid>7031990241086936188</aid>
 <cover_pid>7031990241087005114</cover_pid>
 <owner>1337262814</owner>
 <name>Christmas 2008</name>
 <created>1230361978</created>
 <modified>1230362306</modified>
 <description>My Album</description>
 <location/>
 <link>http://www.example.com/album.php?aid=5234&amp;id=1337262814</link>
 <size>50</size>
 <visible>friends</visible>
 </album>
<album>
 <aid>7031990241086935881</aid>
 <cover_pid>7031990241087001093</cover_pid>
 <owner>1637262814</owner>
 <name>Hock</name>
 <created>1229889219</created>
 <modified>1229889235</modified>
 <description>Misc Pics</description>
 <location/>
 <link>http://www.example.com/album.php?aid=4937&amp;id=1637262814</link>
 <size>1</size>
 <visible>friends-of-friends</visible>
 </album>
<album>
 <aid>7031990241086935541</aid>
 <cover_pid>7031990241086996817</cover_pid>
 <owner>1637262814</owner>
 <name>Test Album 2 (for work)</name>
 <created>1229460455</created>
 <modified>1229460475</modified>
 <description>this is a test album</description>
 <location/>
 <link>http://www.example.com/album.php?aid=4547&amp;id=1637262814</link>
 <size>1</size>
 <visible>everyone</visible>
 </album>
<album>
 <aid>7031990241086935537</aid>
 <cover_pid>7031990241086996795</cover_pid>
 <owner>1637262814</owner>
 <name>Test Album (for work)</name>
 <created>1229459168</created>
 <modified>1229459185</modified>
 <description>Testing for work</description>
 <location/>
 <link>http://www.example.com/album.php?aid=4493&amp;id=1637262814</link>
 <size>1</size>
 <visible>friends</visible>
 </album>
 </photos_GetAlbums_response>";
    static void Main()
    {
        XmlSerializer ser = new XmlSerializer(typeof(GetAlbumsResponse));
        GetAlbumsResponse response;
        using (StringReader reader = new StringReader(xml))
        {
            response = (GetAlbumsResponse)ser.Deserialize(reader);
        }

    }
}

[Serializable, XmlRoot("photos_GetAlbums_response")]
public class GetAlbumsResponse
{
    [XmlElement("album")]
    public List<Album> Albums {get;set;}

    [XmlAttribute("list")]
    public bool IsList { get; set; }
}
public enum AlbumVisibility
{
    [XmlEnum("")]
    None,
    [XmlEnum("friends")]
    Friends,
    [XmlEnum("friends-of-friends")]
    FriendsOfFriends,
    [XmlEnum("everyone")]
    Everyone

}
[Serializable]
public class Album
{
    static readonly DateTime epoch = new DateTime(1970, 1, 1);
    static long SerializeDateTime(DateTime value)
    {
        return (long)((value - epoch).TotalSeconds);
    }
    static DateTime DeserializeDateTime(long value)
    {
        return epoch.AddSeconds(value);
    }
    [XmlElement("aid")]
    public long AlbumID { get; set; }

    [XmlElement("cover_pid")]
    public long CoverPhotoID { get; set; }

    [XmlElement("owner")]
    public long Owner { get; set; }

    [XmlElement("name")]
    public string AlbumName { get; set; }

    [XmlIgnore]
    public DateTime CreateDate { get; set; }

    [XmlElement("created"), Browsable(false)]
    [EditorBrowsable(EditorBrowsableState.Never)]
    public long CreateDateInt64 {
        get {return SerializeDateTime(CreateDate);}
        set {CreateDate = DeserializeDateTime(value);}
    }

    [XmlIgnore]
    public DateTime LastModifiedDate { get; set; }

    [XmlElement("modified"), Browsable(false)]
    [EditorBrowsable(EditorBrowsableState.Never)]
    public long LastModifiedDateInt64
    {
        get { return SerializeDateTime(LastModifiedDate); }
        set { LastModifiedDate = DeserializeDateTime(value); }
    }

    [XmlElement("description")]
    public string Description { get; set; }

    [XmlElement("location")]
    public string Location { get; set; }

    [XmlElement("link")]
    public string Link { get; set; }

    [XmlElement("size")]
    public int Size { get; set; }

    [XmlElement("visible")]
    public AlbumVisibility Visibility { get; set; }
}



<Album><photos_GetAlbums_response>
<Album>
   <photos_GetAlbums_response>
      <Album>
         <photos_GetAlbums_response> ....



[Serializable, XmlRoot("photos_GetAlbums_response",
    Namespace="http://api.example.com/1.0/")]
public class GetAlbumsResponse { /* code as before */ }

[Serializable, XmlType(Namespace="http://api.example.com/1.0/")]
public class Album { /* code as before */ }



string fixedXml = xml.Replace("&", "&amp;");



[XmlElement("aid")]
public string AlbumID { get; set; }

[XmlElement("cover_pid")]
public string CoverPhotoID { get; set; }

[XmlElement("owner")]
public string Owner { get; set; }



    <Root>
       <ArrayNode>
         <SubnodeType1>...</SubnodeType1>
         <SubnodeType1>...</SubnodeType1>
       </ArrayNode>
    </Root>
Or
    <Root>
       <ArrayNode>
         <SubnodeType2>...</SubnodeType2>
         <SubnodeType2>...</SubnodeType2>
       </ArrayNode>
    </Root>



[XmlRoot(Namespace = "", ElementName = "Root")]
public class Root
{
    [XmlArray(ElementName = "ArrayNode", Namespace = "", IsNullable = false, Order = 1)]
    [XmlArrayItem("SubnodeType1")]
    public List<SubnodeType1> SubnodeType1 { get; set; }
    [XmlArray(ElementName = "ArrayNode", Namespace = "", IsNullable = false, Order = 2)]
    [XmlArrayItem("SubnodeType2")]
    public List<SubnodeType2> SubnodeType2 { get; set; }
}