[RESOLVED] Serializing an Enum

Hi all,

i need to backup a list filled with objects of this class:

Code:

---

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace XML2
{
    public enum userLevel { Manager, Librarian, Reader };
    [Serializable]
    public class Users
    {
        public string _username { get; set; }
        public string _password { get; set; }
        public userLevel _level { get; set; }
        public Users()
        {

        }
        public Users(string name, string password, userLevel level)
        {
            _username = name;
            _password = password;
            _level = level;
        }
    }
}

---

This is my list class:

Code:

---

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Serialization;
using System.IO;

namespace XML2
{

    [Serializable]
    public class userDB
    {
        List<Users> users = new List<Users>();
        public userDB()
        {
           
            users.Add(new Users("Administrator", "12345678", userLevel.Manager));
            users.Add(new Users("Librarian", "12345678", userLevel.Librarian));
            users.Add(new Users("Reader", "12345678", userLevel.Reader));
            save();
        }
        public void save()
        {
            XmlSerializer serializer = new XmlSerializer(typeof(List<Users>));
            using (FileStream fs = File.Open(@"users.xml", FileMode.Create))
            {
                serializer.Serialize(fs, users);
            }
        }
    }
}

---

When i execute it without the Enum it works fine but with it it crashes.
is there any solution for this?

Thanx in advance.

I'm using VS2008

Quote:

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Originally Posted by VitalyUr

When i execute it without the Enum it works fine but with it it crashes.

---

In what way? Any error messages, any exceptions thrown? Or the file is not created properly, or what?
Can you elaborate a bit more?

When i debug the program it says:
"InvalidOperationException was unhandled"
'There was an error reflecting type 'System.Collections.Generic.List' 1[Library.Users]".

and it points on this line:

Code:

---

XmlSerializer serializer = new XmlSerializer(typeof(List<Users>));

---

Here you go..

Code:

---

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

namespace UserXml
{
    [Serializable]
    public enum UserLevel { Manager, Librarian, Reader };
   
    [Serializable]
    public class User
    {
        [XmlAttribute ( AttributeName = "userName")]
        public string Username { get; set; }
       
        [XmlAttribute( AttributeName = "password" )]
        public string Password { get; set; }
       
        [XmlAttribute( AttributeName = "level" )]
        public UserLevel Level { get; set; }
    }

    [Serializable]
    [XmlType( AnonymousType = true )]
    [XmlRoot( ElementName = "userDb", Namespace = "", IsNullable = false )]
    public class UserDb
    {
        [XmlArray( ElementName= "users")]
        [XmlArrayItem( ElementName= "user")]
        public User[] Users
        {
            get { return _userList.ToArray(); }

            set
            {
                if( _userList == null ) { _userList = new List<User>( ); }

                if( value != null )
                {
                    _userList.AddRange( value );
                }
            }
        }

        public UserDb( )
        {
            _userList.Add( new User { Level = UserLevel.Manager, Username = "Administrator", Password = "12345678" } );
            _userList.Add( new User { Level = UserLevel.Librarian, Username = "Librarian", Password = "12345678" } );
            _userList.Add( new User { Level = UserLevel.Reader, Username = "Reader", Password = "12345678" } );
        }

        public void Save( string xmlFile )
        {
            var serializer = new XmlSerializer( typeof( UserDb ) );
           
            using ( var fs = File.Open( xmlFile, FileMode.Create ) )
            {
                serializer.Serialize( fs, this );
            }
        }

        private List<User> _userList = new List<User>( );
    }



    class Program
    {
        static void Main( string [ ] args )
        {
            var userDb = new UserDb( );
            userDb.Save( "users.xml" );
        }
    }
}

---

Produces the output of (which may not be exactly what you need):

Code:

---

<?xml version="1.0"?>
<userDb xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <users>
    <user userName="Administrator" password="12345678" level="Manager" />
    <user userName="Librarian" password="12345678" level="Librarian" />
    <user userName="Reader" password="12345678" level="Reader" />
  </users>
</userDb>

---

There is (or at least was) a glitch in serialization of generics. Try replace List<User> with User[].

Thank you all for the quick response

Arjay, it works great, i know now that Enums should be serialized too.