using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading;

using System.Workflow.Runtime;

namespace Securancy.Extensions.Workflow

{

    public static class WorkflowExecutive

    {

        /// <summary>

        /// Dynamically executes a workflow during runtime.

        /// </summary>

        /// <param name="workflowType">typeof<T> where T is the Workflow Type.</param>

        /// <param name="namedArgumentValues">Dictionary list (string, object) with the optional parameters.</param>

        /// <remarks>

        /// The static InvokeWorkflow method allows you to easily execute an existing workflow or activity. 

        /// It will also rethrow any unhandled errors thrown by a workflow. 

        /// </remarks>

        /// <example>

        ///     Dictionary<string, object> args = new Dictionary<string, object>();

        ///     Person customerParam = new Person();

        ///     customerParam.BirthDate = DateTime.Now.AddYears(-21);

        ///     args.Add("CustomerInstance", customerParam);

        ///     

        ///     InvokeWorkflow(typeof(ZeelandNet.Services.BusinessProcesses.ValidateCustomer), args);

        /// </example>

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2201:DoNotRaiseReservedExceptionTypes", Justification = "Exception ex = a valid Exception Type.")]

        public static void InvokeWorkflow(Type workflowType, Dictionary<string, object> namedArgumentValues)

        {

            using (WorkflowRuntime workflowRuntime = new WorkflowRuntime())

            {

                AutoResetEvent waitHandle = new AutoResetEvent(false);

                Exception eResult = null;

                #region -- Workflow Events --

                workflowRuntime.WorkflowCompleted += delegate(object sender, WorkflowCompletedEventArgs e)

                {

                    // All is well:

                    waitHandle.Set();

                };

                workflowRuntime.WorkflowTerminated += delegate(object sender, WorkflowTerminatedEventArgs e)

                {

                    // An exception has occured:

                    if (e.Exception != null) { eResult = new Exception(e.Exception.Message, e.Exception); }

                    waitHandle.Set();

                };

                #endregion

                // Initialize and start the workflow:

                WorkflowInstance workflowInstance = workflowRuntime.CreateWorkflow(workflowType, namedArgumentValues);

                workflowInstance.Start();

                waitHandle.WaitOne();

                #region -- Finalize and cleanup --

                // If the WorkflowRuntime threw an error, spit it out:

                if (eResult != null) { throw eResult; }

                #endregion

            }

        }

    }

}

// Create container for parameters ('Properties' in your Workflow):

Dictionary<string, object> args = new Dictionary<string, object>();

// Provide the property 'Name' - and the instance (note: replace MyCustomerObject with any Type):

MyCustomObject parameter = new MyCustomObject();

args.Add("NameOfYourProperty", parameter);

// Start your Worfklow:

WorkflowExecutive.InvokeWorkflow(typeof(MyWorkflowName), args);