Have you tried adding the Serializable attribute?
See example below. You need to "attribute up" both the base class, and
subclass.
using System;
using System.Collections.Generic;
using System.Text;
using System.ServiceModel;
using System.Collections.ObjectModel;
using System.Runtime.Serialization;
namespace MyCompany.MyApplication
{
[Serializable]
[DataContract]
public class HelpDeskTicketDifficulty
{
[DataMember]
private Guid _helpDeskTicketDifficultyUUID;
[DataMember]
private int _helpDeskTicketDifficultyID;
[DataMember]
private string _helpDeskTicketDifficultyName = string.Empty ;
public HelpDeskTicketDifficulty() { } //unnecessary, but a
placeholder
public HelpDeskTicketDifficulty(System.Guid
helpDeskTicketDifficultyUUID, int helpDeskTicketDifficultyID, string
helpDeskTicketDifficultyName)
{
this._helpDeskTicketDifficultyUUID =
helpDeskTicketDifficultyUUID;
this._helpDeskTicketDifficultyID = helpDeskTicketDifficultyID;
this._helpDeskTicketDifficultyName =
helpDeskTicketDifficultyName;
}
#region A
public Guid HelpDeskTicketDifficultyUUID
{
get
{
return this._helpDeskTicketDifficultyUUID;
}
set
{
this._helpDeskTicketDifficultyUUID = value;
}
}
public int HelpDeskTicketDifficultyID
{
get
{
return _helpDeskTicketDifficultyID;
}
set
{
_helpDeskTicketDifficultyID = value;
}
}
public string HelpDeskTicketDifficultyName
{
get
{
return _helpDeskTicketDifficultyName;
}
set
{
_helpDeskTicketDifficultyName = value;
}
}
#endregion
}
}
"herbert" <he*****@discussions.microsoft.comwrote in message
news:8C**********************************@microsof t.com...
>I defined a WCF callback contract:
<ServiceContract()_
Interface IEBAPEvents
'this interface defines the events to be triggered in the clients
'the EBAP pattern defines two events: a progress event and a completion
event
<OperationContract(IsOneWay:=True)_
Sub OnProgressChanged(ByVal e As FindFilesProgressChangedEventArgs)
<OperationContract(IsOneWay:=True)_
Sub OnFindFilesCompleted(ByVal e As FindFilesCompletedEventArgs)
End Interface
and the event args:
<DataContract()_
Public Class FindFilesProgressChangedEventArgs
Inherits ProgressChangedEventArgs
...
<DataContract()_
Public Class FindFilesCompletedEventArgs
Inherits AsyncCompletedEventArgs
When starting the WCF host an error message appears:
Error: Type 'System.ComponentModel.ProgressChangedEventArgs' cannot be
seria
d. Consider marking it with the DataContractAttribute attribute, and
marking
of its members you want serialized with the DataMemberAttribute attribute.
How do I add an attribute to the .NET class ProgressChangedEventArgs ?
thank you very much
herbert
