I can´t get any output from XML and Binary.

[Marc Hede]

I have been trying to experiment with XML and Binary files. I did so by re-writing a code I made in an ASP NET Web Application. Keycard.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;

namespace Keycard
{
[Serializable()]
public class Keycard : ISerializable
{
protected string name;
protected int mykey;

    public Keycard(string name, int mykey)
    {
        this.Name = name;
        this.Mykey = mykey;
    }

    public string Name
    {
        get { return name; }
        set { name = value; }
    }

    public int Mykey
    {
        get { return mykey; }
        set { mykey = value; }
    }

    public void GetObjectData(SerializationInfo info, StreamingContext context)
    {

        info.AddValue("Name", name);
        info.AddValue("Keynumber", mykey);

    }
    public Keycard(SerializationInfo info, StreamingContext context)
    {
        Name = (string)info.GetValue("Name", typeof(string));
        Mykey = (int)info.GetValue("Keynumber", typeof(int));
    }

    public override string ToString()
    {
        return "Name: " + name + " ---- " + " Keynumber: " + mykey;
    }
}

}

index.aspx.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Configuration;
using System.Xml.Serialization;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;

namespace Keycard
{
public partial class Index : System.Web.UI.Page
{
public void Main(string[] args)
{
Keycard d1 = new Keycard("John", 102030);

        Stream stream = File.Open("KeycardData.dat",
            FileMode.Create);

        BinaryFormatter bf = new BinaryFormatter();

        bf.Serialize(stream, d1);
        stream.Close();

        d1 = null;

        stream = File.Open("KeycardData.dat", FileMode.Open);

        bf = new BinaryFormatter();

        d1 = (Keycard)bf.Deserialize(stream);
        stream.Close();
        Console.WriteLine(d1.ToString());

        XmlSerializer serializer = new XmlSerializer(typeof(Keycard

[Lost User]

It looks like you are trying to run a Console application inside a web page, which will never work. Create a simple Console application and things should work out for you. You can also step through your code with the debugger in order to examine the variables at each step.

[Marc Hede]

Thanks. I got the binary working. With XML I get an error "cannot be serialized because it does not have a parameterless constructor" at this part:

XmlSerializer serializer = new XmlSerializer(typeof(Keycard));

Not sure what to change/add. This is how the code looks now after creating it inside a console application.

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Xml.Serialization;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;

namespace Keycard
{
class Class1
{
public static void Main(string[] args)
{
Keycard d1 = new Keycard("John", 102030);

        Stream stream = File.Open("KeycardData.dat",
            FileMode.Create);

        BinaryFormatter bf = new BinaryFormatter();

        bf.Serialize(stream, d1);
        stream.Close();

        d1 = null;

        stream = File.Open("KeycardData.dat", FileMode.Open);

        bf = new BinaryFormatter();

        d1 = (Keycard)bf.Deserialize(stream);
        stream.Close();
        Console.WriteLine(d1.ToString());

        XmlSerializer serializer = new XmlSerializer(typeof(Keycard));

        using (TextWriter tw = new StreamWriter(@"C\\Brugere\\Marc8\\source\\repos\\keycards.xml"))
        {
            serializer.Serialize(tw, d1);
        }

        d1 = null;

        XmlSerializer deserializer = new XmlSerializer(typeof(Keycard));
        TextReader reader = new StreamReader(@"C\\Brugere\\Marc8\\source\\repos\\keycards.xml");
        object obj = deserializer.Deserialize(reader);
        d1 = (Keycard)obj;
        reader.Close();
        Console.WriteLine(d1.ToString());
    }

}

}

[Lost User]

You need to add the parameterless constructor to your Keycard class as directed by the error message:

public Keycard()
{
// may need default values rather than null at this point.
this.Name = null;
this.Mykey = null;
}