Problem with Tutorial - Creating a Sequential Workflow

using System;

using System.ComponentModel;

using System.Drawing;

using System.Windows.Forms;

using System.Collections.Generic;

using System.Workflow.Runtime;

using System.Workflow.Runtime.Hosting;

using System.Workflow.Activities;

using System.Threading;

namespace Microsoft.Samples.Workflow.Tutorials.SequentialWorkflow

{

[Serializable]

publicclassMainForm :Form,IExpenseReportService

{

private System.Windows.Forms.Label label1;

private System.Windows.Forms.TextBox result;

private System.Windows.Forms.Label label2;

private System.Windows.Forms.Button submitButton;

private System.Windows.Forms.Label approvalState;

private System.Windows.Forms.Button approveButton;

private System.Windows.Forms.Button rejectButton;

private System.Windows.Forms.TextBox amount;

private System.Windows.Forms.Panel panel1;

privateWorkflowRuntime workflowRuntime =null;

privateWorkflowInstance workflowInstance =null;

private System.ComponentModel.IContainer components =null;

privatedelegatevoidGetApprovalDelegate(string message);

publiceventEventHandler<ExternalDataEventArgs> ExpenseReportApproved;

publiceventEventHandler<ExternalDataEventArgs> ExpenseReportRejected;

privateExternalDataExchangeService exchangeService =null;

public MainForm()

{

InitializeComponent();

this.exchangeService =newExternalDataExchangeService();

this.workflowRuntime =newWorkflowRuntime();

workflowRuntime.AddService(exchangeService);

exchangeService.AddService(this);

workflowRuntime.StartRuntime();

workflowRuntime.WorkflowCompleted +=

newEventHandler<WorkflowCompletedEventArgs>

(workflowRuntime_WorkflowCompleted);

// Collapse approve/reject panel

this.Height -=this.panel1.Height;

}

protectedoverridevoid Dispose(bool disposing)

{

if (disposing && (components !=null))

{

components.Dispose();

}

base.Dispose(disposing);

}

privatevoid InitializeComponent()

{

this.label1 =new System.Windows.Forms.Label();

this.result =new System.Windows.Forms.TextBox();

this.label2 =new System.Windows.Forms.Label();

this.submitButton =new System.Windows.Forms.Button();

this.approvalState =new System.Windows.Forms.Label();

this.approveButton =new System.Windows.Forms.Button();

this.rejectButton =new System.Windows.Forms.Button();

this.amount =new System.Windows.Forms.TextBox();

this.panel1 =new System.Windows.Forms.Panel();

this.panel1.SuspendLayout();

this.SuspendLayout();

//

// label1

//

this.label1.AutoSize =true;

this.label1.Location =new System.Drawing.Point(10, 13);

this.label1.Name ="label1";

this.label1.Size =new System.Drawing.Size(43, 13);

this.label1.TabIndex = 1;

this.label1.Text ="Amount";

//

// result

//

this.result.Location =new System.Drawing.Point(13, 70);

this.result.Name ="result";

this.result.ReadOnly =true;

this.result.Size =new System.Drawing.Size(162, 20);

this.result.TabIndex = 1;

this.result.TabStop =false;

//

// label2

//

this.label2.AutoSize =true;

this.label2.Location =new System.Drawing.Point(10, 54);

this.label2.Name ="label2";

this.label2.Size =new System.Drawing.Size(37, 13);

this.label2.TabIndex = 3;

this.label2.Text ="Result";

//

// submitButton

//

this.submitButton.Enabled =false;

this.submitButton.Location =new System.Drawing.Point(56, 95);

this.submitButton.Name ="submitButton";

this.submitButton.Size =new System.Drawing.Size(75, 23);

this.submitButton.TabIndex = 2;

this.submitButton.Text ="Submit";

this.submitButton.Click +=new

System.EventHandler(this.submitButton_Click);

//

// approvalState

//

this.approvalState.AutoSize =true;

this.approvalState.Location =new System.Drawing.Point(10, 9);

this.approvalState.Name ="approvalState";

this.approvalState.Size =new System.Drawing.Size(49, 13);

this.approvalState.TabIndex = 4;

this.approvalState.Text ="Approval";

//

// approveButton

//

this.approveButton.Enabled =false;

this.approveButton.Location =new System.Drawing.Point(11, 25);

this.approveButton.Name ="approveButton";

this.approveButton.Size =new System.Drawing.Size(75, 23);

this.approveButton.TabIndex = 0;

this.approveButton.Text ="Approve";

this.approveButton.Click +=new

System.EventHandler(this.approveButton_Click);

//

// rejectButton

//

this.rejectButton.Enabled =false;

this.rejectButton.Location =new System.Drawing.Point(86, 25);

this.rejectButton.Name ="rejectButton";

this.rejectButton.Size =new System.Drawing.Size(75, 23);

this.rejectButton.TabIndex = 1;

this.rejectButton.Text ="Reject";

this.rejectButton.Click +=new

System.EventHandler(this.rejectButton_Click);

//

// amount

//

this.amount.Location =new System.Drawing.Point(13, 29);

this.amount.MaxLength = 9;

this.amount.Name ="amount";

this.amount.Size =new System.Drawing.Size(162, 20);

this.amount.TabIndex = 0;

this.amount.KeyPress +=new

System.Windows.Forms.KeyPressEventHandler(this.amount_KeyPress);

this.amount.TextChanged +=new

System.EventHandler(this.amount_TextChanged);

//

// panel1

//

this.panel1.Controls.Add(this.approvalState);

this.panel1.Controls.Add(this.approveButton);

this.panel1.Controls.Add(this.rejectButton);

this.panel1.Location =new System.Drawing.Point(7, 124);

this.panel1.Name ="panel1";

this.panel1.Size =new System.Drawing.Size(172, 66);

this.panel1.TabIndex = 8;

//

// MainForm

//

this.AcceptButton =this.submitButton;

this.AutoScaleDimensions =new System.Drawing.SizeF(6F, 13F);

this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

this.ClientSize =new System.Drawing.Size(187, 201);

this.Controls.Add(this.result);

this.Controls.Add(this.label2);

this.Controls.Add(this.panel1);

this.Controls.Add(this.amount);

this.Controls.Add(this.submitButton);

this.Controls.Add(this.label1);

this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.Fixed3D;

this.MaximizeBox =false;

this.MinimizeBox =false;

this.Name ="MainForm";

this.Text ="Simple Expense Report";

this.panel1.ResumeLayout(false);

this.panel1.PerformLayout();

this.ResumeLayout(false);

this.PerformLayout();

}

publicvoid GetLeadApproval(string message)

{

if (this.approvalState.InvokeRequired)

this.approvalState.Invoke(newGetApprovalDelegate

(this.GetLeadApproval), message);

else

{

this.approvalState.Text = message;

this.approveButton.Enabled =true;

this.rejectButton.Enabled =true;

// expand the panel

this.Height +=this.panel1.Height;

this.submitButton.Enabled =false;

}

}

publicvoid GetManagerApproval(string message)

{

if (this.approvalState.InvokeRequired)

this.approvalState.Invoke(newGetApprovalDelegate

(this.GetManagerApproval), message);

else

{

this.approvalState.Text = message;

this.approveButton.Enabled =true;

this.rejectButton.Enabled =true;

// expand the panel

this.Height +=this.panel1.Height;

this.submitButton.Enabled =false;

}

}

void workflowRuntime_WorkflowCompleted(object sender,WorkflowCompletedEventArgs e)

{

if (this.result.InvokeRequired)

{

this.result.Invoke(newEventHandler<WorkflowCompletedEventArgs>

(this.workflowRuntime_WorkflowCompleted), sender, e);

}

else

{

this.result.Text = e.OutputParameters["Result"].ToString();

// Clear fields

this.amount.Text =string.Empty;

// Disable buttons

//this.approveButton.Enabled = false;

// this.rejectButton.Enabled = false;

}

}

privatevoid submitButton_Click(object sender,EventArgs e)

{

Type type =typeof(ExpenseReportWorkflow);

// Construct workflow parameters

Dictionary<string,object> properties =newDictionary<string,object>();

properties.Add("Amount",Int32.Parse(this.amount.Text));

workflowInstance = workflowRuntime.CreateWorkflow(type, properties);

workflowInstance.Start();

}

privatevoid approveButton_Click(object sender,EventArgs e)

{

// Raise the ExpenseReportApproved event back to the workflow

ExpenseReportApproved(null,newExternalDataEventArgs

(this.workflowInstance.InstanceId));

this.Height -=this.panel1.Height;

this.submitButton.Enabled =true;

}

privatevoid rejectButton_Click(object sender,EventArgs e)

{

// Raise the ExpenseReportRejected event back to the workflow

ExpenseReportRejected(null,newExternalDataEventArgs

(this.workflowInstance.InstanceId));

this.Height -=this.panel1.Height;

this.submitButton.Enabled =true;

}

privatevoid amount_KeyPress(object sender,KeyPressEventArgs e)

{

if (!Char.IsControl(e.KeyChar) && (!Char.IsDigit(e.KeyChar)))

e.KeyChar =Char.MinValue;

}

privatevoid amount_TextChanged(object sender,EventArgs e)

{

submitButton.Enabled = amount.Text.Length > 0;

}

}

staticclassProgram

{

[STAThread]

staticvoid Main()

{

Application.EnableVisualStyles();

Application.Run(newMainForm());

}

}

}