XML反序列化不返回任何内容 [英] XML deserialization returns nothing

问题描述

 <   root  >  
 <  帖子 >  
 <   post  >  
 <   id  >  7 <   / id  >  
 <   USERNAME  >  sohaib <   / USERNAME  >  
 <   TITLE  >  help <   / TITLE  >  
 <   USERID  >  1 <   / USERID  >  
 <   / post  >  
 <  < span class =code-leadattribute> post  >  
 <   id  >  7 <   / id  >  
 <   USERNAME  >  sohaib <   / USERNAME  >  
 <   TITLE  >  help <   / TITLE  >  
 <   USERID  >  1 <   / USERID  >  
 <   / post  >  
 <   / posts  >  
 <  评论 >  
 <  评论 >  
 <   COMMENTID  >  2 <   / COMMENTID  >  
 <   COMMENT_TEXT  >  help <   / COMMENT_TEXT  >  
 <   / comment  >  
 <   comment  >  
 <   COMMENTID  >  2 <   / COMMENTID  >  
 <   COMMENT_TEXT  >  help <   / COMMENT_TEXT  >  
 <   / comment  >  
 <   comment  >  
 <   COMMENTID  >  2 <   / COMMENTID  >  
 <   COMMENT_TEXT  >  help <   / COMMENT_TEXT  >  
 <   / comment  >  
 <   / comments  >  
 <   / root  >  

和我的C＃代码来反序列化thi在xml文件上面是

 XmlSerializer xsserializer =  new  XmlSerializer（< span class =code-keyword> typeof （root））; 
 FileStream reader =  new  FileStream（& quot; abc.xml& quot;，FileMode.Open）; 
  object  obj = xsserializer.Deserialize（reader）; 
 root timeline =（root）obj; 
 

我的Root类看起来像



< pre lang =c＃> [Serializable，XmlRoot（& quot; root& quot;），XmlType（& quot; root& quot;）]
public class root
{
[XmlElement（& quot; Posts& quot;）]
public List& lt; Post& gt;帖子= 新列表& lt; Post& gt;（）;
[XmlElement（& quot; Comments& quot;）]
public List& lt; Comment& gt;评论= 新列表& lt; Comment& gt;（）;

}
public class 发​​布
{
[XmlElement（& quot; TITLE& quot;）]
public string 标题;
[XmlElement（& quot; USERID& quot;）]
public long USERID;
[XmlElement（& quot; USERNAME& quot;）]
public string USERNAME;
[XmlElement（& quot; id& quot;）]
public long id;
}

public class 评论
{
[XmlElement（& quot; COMMENTID& quot;）] public long COMMENTID;
[XmlElement（& quot; COMMENT_TEXT& quot;）] public string COMMENT_TEXT;

}

我面临无异常没有错误但仍然在帖子中提供0项和0在评论中。

你能帮我弄清楚我哪里出错了。



我很感激你的回复。



谢谢Sohaib

解决方案

2注意事项：

1）c＃是区分大小写的，意味着发布不等于发布

2）列表（评论）和列表（帖子）以错误方式声明



将其声明更改为：

 [Serializable，System.Xml.Serialization.XmlRoot（ < span class =code-string> root），System.Xml.Serialization.XmlType（  root）] 
  public   class  root 
 {
  / /  而不是：[System.Xml.Serialization.XmlElement（Posts）]，使用： 
 [System.Xml.Serialization。 XmlArray（  posts），System.Xml.Serialization.XmlArrayItem（  post， typeof （Post））] 
 < span class =code-keyword> public  List< Post>帖子= 新列表< Post>（）; 
  //   [System.Xml.Serialization.XmlElement（Comments）]  
 [System.Xml.Serialization.XmlArray（  comments），System.Xml.Serialization。 XmlArrayItem（  comment， typeof （评论））] 
  public 列表<评论>评论= 新列表<评论>（）; 
 
} 

如需了解更多信息，请参阅：

XML序列化和反序列化：第1部分 [ ^ ]

XML序列化和反序列化：第2部分 [ ^ ]

自定义类集合序列化和反序列化的完整示例 [ ^ ]

<root>
    <posts>
        <post>
            <id>7</id>
            <USERNAME>sohaib</USERNAME>
            <TITLE>help</TITLE>
            <USERID>1</USERID>
        </post>
        <post>
            <id>7</id>
            <USERNAME>sohaib</USERNAME>
            <TITLE>help</TITLE>
            <USERID>1</USERID>
        </post>
    </posts>
    <comments>
        <comment>
            <COMMENTID>2</COMMENTID>
            <COMMENT_TEXT>help</COMMENT_TEXT>
        </comment>
        <comment>
            <COMMENTID>2</COMMENTID>
            <COMMENT_TEXT>help</COMMENT_TEXT>
        </comment>
        <comment>
            <COMMENTID>2</COMMENTID>
            <COMMENT_TEXT>help</COMMENT_TEXT>
        </comment>
    </comments>
</root>

and my C# code to deserialize this above xml file is

XmlSerializer xsserializer = new XmlSerializer(typeof(root));
FileStream reader = new FileStream("abc.xml",FileMode.Open);
object obj = xsserializer.Deserialize(reader);
root timeline = (root) obj;

Where my Root class looks like

[Serializable, XmlRoot("root"), XmlType("root")]
public class root
{
    [XmlElement("Posts")]
    public List<Post>  Posts =new List<Post>();
    [XmlElement("Comments")]
    public List<Comment> Comments = new List<Comment>();

}
public class Post
{
    [XmlElement("TITLE")]
    public string TITLE;
    [XmlElement("USERID")]
    public long USERID;
    [XmlElement("USERNAME")]
    public string USERNAME;
    [XmlElement("id")]
    public long id;
}

public class Comment
{
    [XmlElement("COMMENTID")] public long COMMENTID;
    [XmlElement("COMMENT_TEXT")] public string COMMENT_TEXT;

}

I'm facing no exception no error but still it gives 0 items in posts and 0 in comments.
Can you please help me figure out where I'm going wrong.

I appreciate your response.

Thanks Sohaib

解决方案

2 notes:
1) c# is case sensitive, which means that post is not equal to Post
2) List(of comments) and List(of posts) is declared in wrong way

Change its declaration to:

[Serializable, System.Xml.Serialization.XmlRoot("root"), System.Xml.Serialization.XmlType("root")]
public class root
{
    //instead of: [System.Xml.Serialization.XmlElement("Posts")], use:
    [System.Xml.Serialization.XmlArray("posts"), System.Xml.Serialization.XmlArrayItem("post", typeof(Post))]
    public List<Post>  Posts =new List<Post>();
    //[System.Xml.Serialization.XmlElement("Comments")]
    [System.Xml.Serialization.XmlArray("comments"), System.Xml.Serialization.XmlArrayItem("comment", typeof(Comment))]
    public List<Comment> Comments = new List<Comment>();

}

For further information, please see:
XML Serialization and Deserialization: Part-1[^]
XML Serialization and Deserialization: Part-2[^]
A Complete Sample of Custom Class Collection Serialization and Deserialization[^]

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