formonce.cs

此例子主要是关于wwf工作流的应用

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

// Add usings for Runtime and Threading
// A ref was added to System.Workflow.Runtime, System.Workflow.ComponentModel, and System.Workflow.Activities
// They are located in D:\WINDOWS\Microsoft.NET\Framework\v2.0.50215\Windows Workflow Foundation
			
using System.Workflow.Runtime;
using System.Threading;

/////////////////////////////////////////////////////////////////
// Written by Stephen W. Thomas
// http://www.biztalkgurus.com
// http://geekswithblogs.com/sthomas/

// This sample is intenbed to show basic hosting and workflow 
// features of Windows Workflow.  It may not be the best way to 
// accomplish the task or follow best practices.  Enjoy.
/////////////////////////////////////////////////////////////////

namespace WinApp
{
	public partial class FormOnce : Form
	{
		public FormOnce()
		{
			InitializeComponent();
		}

		// Variables used at the class level
		static string sResults = string.Empty;
		static bool bLoop = true;

		private void button1_Click(object sender, EventArgs e)
		{
			// Disable button since this can only be ran once
			button1.Enabled = false;
			
			// Create the workflow runtime 
			WorkflowRuntime wfRuntime = new WorkflowRuntime();

			// Listen for the workflow completed event
			// This is how we know when the Workflow is done
			wfRuntime.WorkflowCompleted += new EventHandler<WorkflowCompletedEventArgs>(wfCompletedEvent);

			// Key Value pairs - uses Dictionary to pass parms in
			Dictionary<string, object> parms = new Dictionary<string, object>();
			parms.Add("orderAmount", System.Convert.ToInt32(textBox1.Text));

			// Load the workflow type from the Referenced project
			System.Type type = typeof(simpleWorkflow.Workflow1);

			// Start an instance of the workflow
			wfRuntime.StartWorkflow(type, parms);

			// Meaningless logic to count as the workflow runs
			// Loop will end once the Completed Event fires
			int i = 1;
			while (bLoop)
			{
				label3.Text = "Started.  Ran for " + i.ToString() + " seconds";
				label3.Refresh();
				i++;
				Thread.Sleep(1000);
			}

			label5.Text = sResults;

			// Can only run this once per form.  So, might as well Stop the workflow
			wfRuntime.StopRuntime();

			label4.Text = "This form can only be ran once.  Please restart to run again.";
		}

		// Code and text from SDK - i.e. I didn't write this nice text:
		// This method will be called when a workflow instance is completed; since we have started only a single
		// instance we are ignoring the event args and signaling the waitHandle so the main thread can continue
		// and exit the program.
		static void wfCompletedEvent(object sender, WorkflowCompletedEventArgs workflowCompletedEventArgs)
		{
			// Get the output parm and store it in the class variable
			sResults = workflowCompletedEventArgs.OutputParameters["validOrder"].ToString();
			
			// Stop the loop
			bLoop = false;
		}
	}
}