Re: Serializing a List<Interface> Property

"sloan" <>
Mon, 31 Aug 2009 15:22:53 -0400
Here is a work around.

Basically, the "concrete" type is stored in the custom xml.

"Roman" <> wrote in message

Hi there,

I was trying to serialize an object with a List<Interface> as
property. If I do this i get an exception. when I add an extra proerty
with type object[] to my class and mark the original property with
[XmlIgnore] it works.
Is there a bettert way to do this without adding this property?

Thanks in advance


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

namespace SerializeTest
 public class Program
   static void Main(string[] args)
     // Create objects
     MainClass cm = new MainClass();

     cm.TestList.Add(new Test1());

     // Try to serialize MainClass
     XmlTextWriter writer = new XmlTextWriter(Console.Out);

     XmlSerializer ser = new XmlSerializer(typeof(MainClass), new Type
     ser.Serialize(writer, cm);



 public class MainClass
   private List<ITest> _test = new List<ITest>();

   public object[] TestListO
       return (object[])_test.ToArray();
       foreach (object o in value)
         if (o is ITest
           && !_test.Contains((ITest)o))

   public List<ITest> TestList
     get { return _test; }
     set { _test = value; }

 public class Test1 : ITest

   #region ITest Members

   public void Test()


 public interface ITest
   void Test();

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