Xml Deserialize return null

Question

I have the following class which contains the objects of class i want Deserialize the xml. i am using following technique its showing null. Actually i want to Deserialize the xml define in the last portion of question. for this purpose i use the following technique may be i am going in wrong way please correct me

[Serializable]
public class Param 
{
    public Professor Professor { get; set; }
    public Course Course { get; set; }
}
public class Professor
{
    public int id;
    public String name;

    public Professor() { }
}
public class Course
{
    public int id;
    public String name;
    public Course() { }
}

Here folowing is the C# Code for Deserialization the xml reading from file schedule.xml sample of xml is define below

 string path = "//schedule.xml";
    XmlRootAttribute xRoot = new XmlRootAttribute();
    xRoot.ElementName = "param";
    xRoot.IsNullable = true;
    XmlSerializer serializer = new XmlSerializer(typeof(Param),xRoot);
    using (StreamReader reader = new StreamReader(path))
    {
    param = (Param)serializer.Deserialize(reader);
    }

Here this is sample of xml defined in schedule.xml file

 <param>
      <professor id='1' name='Novak J.'></professor>
      <Professor id='2' name='Stanek A.'>  </Professor>
      <course id='1' name='Mathematics' biolab='false'> </course>
      <course id='2' name='Biology' biolab='true'>  </course>
 </param>

Answer 1

Change your classes like this and try again. This is the VS generated code for your xml. I tested this using your xml structure and it works. But you may need to regenerate the code again for the complete xml.

/// <remarks/>
[System.Xml.Serialization.XmlTypeAttribute(AnonymousType = true)]
[System.Xml.Serialization.XmlRootAttribute(Namespace = "", IsNullable = false)]
public partial class param
{

    private paramProfessor professorField;

    private paramProfessor1 professorField1;

    private paramCourse[] courseField;

    /// <remarks/>
    public paramProfessor professor
    {
        get
        {
            return this.professorField;
        }
        set
        {
            this.professorField = value;
        }
    }

    /// <remarks/>
    public paramProfessor1 Professor
    {
        get
        {
            return this.professorField1;
        }
        set
        {
            this.professorField1 = value;
        }
    }

    /// <remarks/>
    [System.Xml.Serialization.XmlElementAttribute("course")]
    public paramCourse[] course
    {
        get
        {
            return this.courseField;
        }
        set
        {
            this.courseField = value;
        }
    }
}

/// <remarks/>
[System.Xml.Serialization.XmlTypeAttribute(AnonymousType = true)]
public partial class paramProfessor
{

    private byte idField;

    private string nameField;

    /// <remarks/>
    [System.Xml.Serialization.XmlAttributeAttribute()]
    public byte id
    {
        get
        {
            return this.idField;
        }
        set
        {
            this.idField = value;
        }
    }

    /// <remarks/>
    [System.Xml.Serialization.XmlAttributeAttribute()]
    public string name
    {
        get
        {
            return this.nameField;
        }
        set
        {
            this.nameField = value;
        }
    }
}

/// <remarks/>
[System.Xml.Serialization.XmlTypeAttribute(AnonymousType = true)]
public partial class paramProfessor1
{

    private byte idField;

    private string nameField;

    /// <remarks/>
    [System.Xml.Serialization.XmlAttributeAttribute()]
    public byte id
    {
        get
        {
            return this.idField;
        }
        set
        {
            this.idField = value;
        }
    }

    /// <remarks/>
    [System.Xml.Serialization.XmlAttributeAttribute()]
    public string name
    {
        get
        {
            return this.nameField;
        }
        set
        {
            this.nameField = value;
        }
    }
}

/// <remarks/>
[System.Xml.Serialization.XmlTypeAttribute(AnonymousType = true)]
public partial class paramCourse
{

    private byte idField;

    private string nameField;

    private bool biolabField;

    /// <remarks/>
    [System.Xml.Serialization.XmlAttributeAttribute()]
    public byte id
    {
        get
        {
            return this.idField;
        }
        set
        {
            this.idField = value;
        }
    }

    /// <remarks/>
    [System.Xml.Serialization.XmlAttributeAttribute()]
    public string name
    {
        get
        {
            return this.nameField;
        }
        set
        {
            this.nameField = value;
        }
    }

    /// <remarks/>
    [System.Xml.Serialization.XmlAttributeAttribute()]
    public bool biolab
    {
        get
        {
            return this.biolabField;
        }
        set
        {
            this.biolabField = value;
        }
    }
}

Answer 2

Your sample XML:

 <param>
      <professor id='1' name='Novak J.'></professor>
      <professor id='2' name='Stanek A.'>  </professor>
      <course id='1' name='Mathematics' biolab='false'> </course>
      <course id='2' name='Biology' biolab='true'>  </course>
 </param>

The serializable class:

[XmlRoot(Namespace = "", ElementName = "param")]
public class Param
{
    [XmlElement("professor")]
    public List<professor> Professor { get; set; }
    [XmlElement("course")]
    public List<course> Course { get; set; }
}
public class professor
{
    [XmlAttribute("id")]
    public int professorid;
    [XmlAttribute("name")]
    public string professorname;

    public professor() { }
}
public class course
{
    [XmlAttribute("id")]
    public int courseid;
    [XmlAttribute("name")]
    public string coursename;

    public course() { }
}

Call deserialization code:

DeserializeFromXml<Param>(XMLinStringVariable);

C# code for deserialization:

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

Edit : The error lies in the fact that both <professor> and <course> tag use the same attribute names. So I added XmlElement and XmlAttribute tags in the serialization class to bifurcate them.

Answer 3

you have to mark id and name as XML Attribute in the class so that values are picked during desrialzation. I have also restructured your XML. Have a look below

static void Main(string[] args)
    {
        string xml = File.ReadAllText(path of the file);
        Param p = DeserializeFromXml<Param>(xml);
    }

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

}

[Serializable]
[XmlRoot(Namespace = "", ElementName = "param")]
public class Param
{
    [XmlArray("professors")]
    public List<professor> Professor { get; set; }
    [XmlArray("courses")]
    public List<course> Course { get; set; }
}
public class professor
{
   [XmlAttribute("id")]
    public int id { get; set; }
   [XmlAttribute("name")]
    public string name { get; set; }



    public professor() { }
}
public class course
{
     [XmlAttribute("id")]
    public int id { get; set; }
       [XmlAttribute("name")]
    public string name { get; set; }

    public course() { }
}

New XML

<param>
<professors>
      <professor id='1' name='Novak J.'></professor>
      <professor id='2' name='Stanek A.'>  </professor>
</professors>
<courses>
      <course id='1' name='Mathematics' biolab='false'> </course>
      <course id='2' name='Biology' biolab='true'>  </course>
</courses>
</param>