using System;

using System.Collections.Generic;

using System.Text;

using System.Text.RegularExpressions;

using System.Workflow.Activities;

using System.Workflow.ComponentModel;

using Microsoft.SharePoint.Workflow;

namespace HubKey.DevelopmentHole

{

    public sealed partial class MyWorkflow: SequentialWorkflowActivity

    {

        //assign workflowProperties in the OnWorkflowActivated activity

        public SPWorkflowActivationProperties workflowProperties = new SPWorkflowActivationProperties();

        protected override ActivityExecutionStatus HandleFault(ActivityExecutionContext executionContext, Exception exception)

        {

            try

            {

                workflowProperties.Workflow.CreateHistoryEvent(

                    (int)SPWorkflowHistoryEventType.WorkflowError,

                    0,

                    workflowProperties.OriginatorUser,

                    "Nothing good",

                    string.Format("An exception occured during activity {0}. Check the item data for more information.", executionContext.Activity.Name),

                    Misc.FormatException(exception));

            }

            catch { }

            return base.HandleFault(executionContext, exception);

        }

    }

    public static class Misc

    {

        static Regex stackRegex = new Regex(@"\r\n   at ", RegexOptions.Compiled);

        public static string FormatException(Exception ex)

        {

            return FormatException(ex, new StringBuilder(), 0);

        }

        private static string FormatException(Exception ex, StringBuilder sb, int tab)

        {

            if (ex == null)

                return sb.ToString();

            string sTab = new string('\t', tab);

            sb.AppendFormat("{0}Source: {1}\r\n", sTab, ex.Source);

            sb.AppendFormat("{0}Message: {1}\r\n", sTab, ex.Message);

            sb.AppendFormat("{0}StackTrace: {1}\r\n", sTab, FormatStackTrace(ex, sTab));

            sb.AppendLine();

            return FormatException(ex.InnerException, sb, ++tab);

        }

        private static string FormatStackTrace(Exception ex, string sTab)

        {

            string stack = ex.StackTrace;

            if (stack == null)

                return null;

            stack = stackRegex.Replace(ex.StackTrace, delegate(Match m)

            {

                return string.Format("\r\n{0}   at ", sTab);

            });

            return stack;

        }

    }