XML deserialization returns nothing

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XML

<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

C#

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

Where my Root class looks like

C#

[Serializable, XmlRoot(&quot;root&quot;), XmlType(&quot;root&quot;)]
public class root
{
    [XmlElement(&quot;Posts&quot;)]
    public List&lt;Post&gt;  Posts =new List&lt;Post&gt;();
    [XmlElement(&quot;Comments&quot;)]
    public List&lt;Comment&gt; Comments = new List&lt;Comment&gt;();

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

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

Posted 11-Oct-15 9:38am

Sohaib Javed

Updated 11-Oct-15 10:29am

Maciej Los

v2

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Maciej Los · Accepted Answer · 2015-10-11T11:01:00

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:

C#

[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[^]