Hashtable serialization

Hashtable serialization

• gansfield

  Hi, I would like to serialize Hashtable, that is
  filled with instances of custom made class.
  Below is an example.

  // custom made class implementation

  [DataContract]
  public class Song
  {
    [DataMember]
    public int ID;
    [DataMember]
    public string Artist;
    [DataMember]
    public string Song;
   
    public Song() {}
   
    public Song(int ID, string Artist, string Song)
    {
      this.ID = ID;
      this.Artist = Artist;
      this.Song = Song;
    }
  }

  // serivce implementation

  [ServiceOperation]
  Hashtable MediaCatalogue()
  {
    Hashtable HT = new Hashtable();
    HT.Add(new Song(1,"Artist","Song"),"1");
    HT.Add(new Song(2,"Artist","Song"),"2");
    return (HT);
  }

  I have successfully hosted service on IIS, but on client
  side i get deserialization problem. Deserialization is successfull,
  when Hashtable is filled with string instances,
  like HT.Add("1","Hello");
  HT.Add("2","World");

  Thank you.

  Best regards, Saso

  
  

• FrankV

  Saso:
  
  Use the KnownTypeAttribute to get the XMLFormatter to deserialize the wire goo into your known .NET type.
  
  This is equivalent to the XMLInclude of the XMLSerializer of .NET 1.*
  
  HTH

  
  
  

• Joris Wit

  If you are using Feb CTP please use ServiceKnownType instead of KnownType.

  I hope this works.

  
  
  

• Ibai Peña

  Thank you for reply.
  
  I already tryed with KnownTypeAttribute. I did as follows:
  
  [ServiceOperation]
  [KnownType(typeof(Song))]
  Hashtable MediaCatalogue()
  {
    Hashtable HT = new Hashtable();
    HT.Add(new Song(1,"Artist","Song"),"1");
    HT.Add(new Song(2,"Artist","Song"),"2");
    return (HT);
  }
  
  Service compiled without errors, but with KnownType attribute
  tool "svcutil" fails. If i did something wrong, could you please
  make up my example in first post
  
  Thank you.
  
  Kind regards,
  Saso
  

• Kelvin Hoover

  What is the error message you are getting from the SVCUTIL tool

  
  
  
• Hashtable serialization