ontaskchanged Error occured

Question

I'm trying to create a simple workflow containing a while in which you can find : createtaskwithcontenttypes while Ontaskchanged completetask

When I try to launch the workflow by adding a new item to my associate list, I find myself with a "Error occured". So I tried to debug a little and found out that the error was on the ontaskchanged event receiver. But the only thing it does is leaving the workflow. I have no error message or whatever.

So I've looked upon the internet, and found out some similar problem. But I guess I didn't find mine, or I didn't understand what it was about !

Here is my create task method :

private void createTaskWithContentType1_MethodInvoking(object sender, EventArgs e)
{
    TaskProperties = new SPWorkflowTaskProperties();
    TaskId = Guid.NewGuid();
    TaskProperties.Title = Title;
    TaskProperties.Description = DescriptionName;
    TaskProperties.DueDate = DueDate;
    TaskProperties.AssignedTo = this.Approver;
    TaskProperties.PercentComplete = 0;
    TaskProperties.StartDate = DateTime.Today;
}

Here is my while code condition :

private void WaitResponse_Invoke(object sender, ConditionalEventArgs e)
{
    e.Result = !isFinished;
}

Here is the invoked method of my ontaskchanged event receiver (basically does nothing) :

private void WaitApproval_Invoked(object sender, ExternalDataEventArgs e)
{           
}

Here are the after and before propertie : public static DependencyProperty WaitApproval_AfterPropertiesProperty =

DependencyProperty.Register("WaitApproval_AfterProperties", typeof(Microsoft.SharePoint.Workflow.SPWorkflowTaskProperties), typeof(ActivityLibrary.EtapeOuiNon));

    [DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Visible)]
    [BrowsableAttribute(true)]
    [CategoryAttribute("Misc")]
    public Microsoft.SharePoint.Workflow.SPWorkflowTaskProperties WaitApproval_AfterProperties
    {
        get
        {
            return ((Microsoft.SharePoint.Workflow.SPWorkflowTaskProperties)(base.GetValue(ActivityLibrary.EtapeOuiNon.WaitApproval_AfterPropertiesProperty)));
        }
        set
        {
            base.SetValue(ActivityLibrary.EtapeOuiNon.WaitApproval_AfterPropertiesProperty, value);
        }
    }

    public static DependencyProperty WaitApproval_BeforePropertiesProperty = DependencyProperty.Register("WaitApproval_BeforeProperties", typeof(Microsoft.SharePoint.Workflow.SPWorkflowTaskProperties), typeof(ActivityLibrary.EtapeOuiNon));

    [DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Visible)]
    [BrowsableAttribute(true)]
    [CategoryAttribute("Misc")]
    public Microsoft.SharePoint.Workflow.SPWorkflowTaskProperties  WaitApproval_BeforeProperties
    {
        get
        {
            return ((Microsoft.SharePoint.Workflow.SPWorkflowTaskProperties)(base.GetValue(ActivityLibrary.EtapeOuiNon.WaitApproval_BeforePropertiesProperty)));
        }
        set
        {
            base.SetValue(ActivityLibrary.EtapeOuiNon.WaitApproval_BeforePropertiesProperty, value);
        }
    }

For information the correlation token is the same everywhere. Also all of this part of my workflow are in a separate activity.

So if someone has an idea of what it could be ! Thanks a lot !

Answer 1

I've found the problem ! When the ontaskchanged event is accessed, the workflow is trying to serialize itself, so that it can be stock while waiting for the event to be triggered !

The problem is that in my workflow i was using personalize object which were not serialazible as public variable :

public sealed partial class Workflow1 : SequentialWorkflowActivity
{
    public Workflow1()
    {
        InitializeComponent();
    }
    public List<DefEtape> ListeEtapes = new List<DefEtape>();
    public DefEtape etapeEnCours = new DefEtape();

To overcome this proble I've just added : [Serializable] to my classes so that it became :

namespace CSPIMMOHelper
{
    [Serializable]
    public class DefEtape
    {

I hope this will help some people