serialization - C# testable serialize class -

i have big solution many count of serializers/deserializers +interfaces. i'd reduce files count keep testability , readability of code. i'm searching serializer provider (not factory), example:

interface iserializable     {         string serialize<t>(t obj);         t deserialize<t>(string xml);     }      class serializable : iserializable     {         public string serialize<t>(t obj)         {             return this.toxml(obj);         }          public t deserialize<t>(string xml)         {             throw new system.notimplementedexception();         }     }      internal static class serializers     {         public static string toxml(this serializable s, int value)         {          }         public static string toxml(this serializable s, sometype value)         {          }     } 

in case i'll need add new extension serialize type. common interface stay:

iserializable provider; provider.serialize<sometype>(obj); 

using system; using system.io;  namespace consoleapplication2 {   using system.runtime.serialization;   using system.xml;    public interface iserializable   {     void serialize<t>(t obj, string xmlfile);      t deserialize<t>(string xmlfile);   }    public class serializable : iserializable   {     public void serialize<t>(t obj, string xmlfile)     {       stream xmlstream = null;       try       {         xmlstream = new memorystream();         var dcserializer = new datacontractserializer(typeof(t));         dcserializer.writeobject(xmlstream, obj);         xmlstream.position = 0;          // todo save file here use datacontract        }   catch (exception e)   {     throw new xmlexception("xml error", e);   }     {     if (xmlstream != null)     {       xmlstream.close();     }   } }   public t deserialize<t>(string xmlfile) {   filestream fs = null;    try   {     fs = new filestream(xmlfile, filemode.open, fileaccess.read, fileshare.readwrite);      if (fs.canseek)     {       fs.position = 0;     }      var dcserializer = new datacontractserializer(typeof(t));     var value = (t)dcserializer.readobject(fs);     fs.close();     return value;    }   catch (exception e)   {     throw new xmlexception("xml error", e);   }         {      if (fs != null)         {           fs.close();         }       }     }   }        [datacontract]   public class   {     [datamember]     public int test { get; set; }   }    public class test   {     public test()     {       var = new { test = 25 };        var ser = new serializable();       ser.serialize(a, "c:\\test.xml");       var a2 = ser.deserialize<a>("c:\test.xml");        if (a2.test == a.test)         console.writeline("done");     }   }