EmailActivity组件开发

1、创建Activity Library
2、更改Base Class 为System.Workflow.ComponentModel.Activity
3、插入代码段 Workflow－>DependencyProperty Property，定义属性
4、重写Execute事件

 

protected override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext)
        ...{
            //Console.WriteLine(To);

            MailAddress toAddress = new MailAddress(To);
            MailAddress fromAddress = new MailAddress(From);
            MailAddressCollection addresses = new MailAddressCollection();
            addresses.Add(toAddress);
            MailMessage msg = new MailMessage(fromAddress,toAddress);
            msg.Subject = Subject;
            msg.Body = Body;
            SmtpClient mail = new SmtpClient("localhost");
            mail.Send(msg);
            return ActivityExecutionStatus.Closed;
        }

 

5、添加代码文件（Code file），对先前定义的属性进行验证

 

using System;
using System.Workflow.Activities;
using System.Workflow.ComponentModel;
using System.Workflow.ComponentModel.Compiler;
using System.Text.RegularExpressions;
using System.Net.Mail;

namespace SendMailActivityLibrary
...{
    public class ParametersValidator : ActivityValidator
    ...{
        public override ValidationErrorCollection ValidateProperties(ValidationManager manager, object obj)
        ...{
            ValidationErrorCollection validationErrors = new ValidationErrorCollection(base.ValidateProperties(manager, obj));
            SendMailActivity sendMailActivityToBeValidated = obj as SendMailActivity;
            if (sendMailActivityToBeValidated == null)
            ...{
                throw new InvalidOperationException("Parameter obj is not of type SendMailActivity");
            }
            if (!IsValidEmailAddress(sendMailActivityToBeValidated.To))
            ...{
                ValidationError CustomActivityValidationError = new ValidationError(String.Format("'{0}' is an Invalid destination e-mail address", sendMailActivityToBeValidated.To), 1);
                validationErrors.Add(CustomActivityValidationError);
            }
            if (!IsValidEmailAddress(sendMailActivityToBeValidated.From))
            ...{
                ValidationError CustomActivityValidationError =
                    new ValidationError(String.Format("'{0}' is an Invalid source e-mail address", sendMailActivityToBeValidated.From), 1);
                validationErrors.Add(CustomActivityValidationError);
            }
            return validationErrors;
            //return base.ValidateProperties(manager, obj);
        }

        private bool IsValidEmailAddress(string address)
        ...{
            //throw new Exception("The method or operation is not implemented.");
            if (address == null || address.Length == 0)
            ...{
                return true;
            }

            Regex rx = new Regex(@"[^A-Za-z0-9@-_.]", RegexOptions.Compiled);
            MatchCollection matches = rx.Matches(address);
            if (matches.Count > 0)
            ...{
                return false;
            }

            int i = address.IndexOf('@');
            if (i <= 0 || i > address.Length - 3)
            ...{
                return false;
            }

            if (address.IndexOf('@', i + 1) >= 0)
            ...{
                return false;
            }

            int j = address.LastIndexOf('.');
            if (j >= 0 && j <= i + 1)
            ...{
                return false;
            }
            return true;

        }

    }
}

 

6、添加代码文件（Code file），进行界面设计

 

using System;
using System.Text;
using System.ComponentModel;
using System.Collections;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Design;
using System.Workflow.ComponentModel.Compiler;
using System.Workflow.ComponentModel.Serialization;
using System.Workflow.ComponentModel;
using System.Workflow.ComponentModel.Design;
using System.Workflow.Runtime;
using System.Workflow.Activities;
using System.Workflow.Activities.Rules;

namespace SendMailActivityLibrary
...{
    public class SendMailDesigner:ActivityDesigner
    ...{
        SendMailActivity parentActivity;

        protected override void Initialize(Activity activity)
        ...{
            base.Initialize(activity);
            parentActivity = (SendMailActivity)activity;
        }

        protected override Size OnLayoutSize(ActivityDesignerLayoutEventArgs e)
        ...{
            return new Size(230, 100);
        }

        protected override void OnPaint(ActivityDesignerPaintEventArgs e)
        ...{
            Rectangle frameRect = new Rectangle(this.Location.X, this.Location.Y, this.Size.Width - 5, this.Size.Height - 5);
            Rectangle shadowRect = new Rectangle(frameRect.X + 5, frameRect.Y + 5, frameRect.Width, frameRect.Height);
            Rectangle pageRect = new Rectangle(frameRect.X + 4, frameRect.Y + 24, frameRect.Width - 8, frameRect.Height - 28);
            Rectangle titleRect = new Rectangle(frameRect.X + 15, frameRect.Y + 4, frameRect.Width / 2, 20);
            Brush frameBrush =new LinearGradientBrush(frameRect,Color.DarkBlue,Color.LightBlue,45);
            e.Graphics.FillPath(Brushes.LightGray,RoundedRect(shadowRect));
            e.Graphics.FillPath(frameBrush,RoundedRect(frameRect));
            e.Graphics.FillPath(new LinearGradientBrush(pageRect,Color.White,Color.WhiteSmoke,45),RoundedRect(pageRect));
            e.Graphics.DrawString(Activity.QualifiedName,new Font("Segoe UI",9),Brushes.White,titleRect);
            frameRect.Inflate(20,20);
            string textToDisplay=String.Format("To : '{0}' From : '{1}' Subject : '{2}' ",parentActivity.To,parentActivity.From,parentActivity.Subject);
            e.Graphics.DrawString(String.Format(textToDisplay,parentActivity.Subject),new Font("宋体",8),Brushes.Black,pageRect.X,pageRect.Y+15);

        }

        private GraphicsPath RoundedRect(Rectangle frame)
        ...{
            GraphicsPath path=new GraphicsPath();
            int radius=7;
            int diameter=radius*2;
            Rectangle arc=new Rectangle(frame.Left,frame.Top,diameter,diameter);
            path.AddArc(arc,180,90);
            arc.X=frame.Right-diameter;
            path.AddArc(arc,270,90);
            arc.Y=frame.Bottom-diameter;
            path.AddArc(arc,0,90);
            arc.X=frame.Left;
            path.AddArc(arc,90,90);
            path.CloseFigure();
            return path;
        }
    }
}

 

7、添加验证和界面支持

[Designer(typeof(SendMailDesigner),typeof(IDesigner))]
[ActivityValidator(typeof(ParametersValidator))]