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public string To { get { return ((string)(base.GetValue(SendEmailC.ToProperty))); } set { base.SetValue(SendEmailC.ToProperty, value); } } [DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Visible)] [ValidationOption(ValidationOption.Optional)] [BrowsableAttribute(true)] [DescriptionAttribute("The Subject property is used to specify the subject of the Email message.")] public string Subject { get { return ((string)(base.GetValue(SendEmailC.SubjectProperty))); } set { base.SetValue(SendEmailC.SubjectProperty, value); } } [DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Visible)] [ValidationOption(ValidationOption.Required)] [BrowsableAttribute(true)] [DescriptionAttribute("The From property is used to specify the From (Sender's) address for the email message.")] public string From { get { return ((string)(base.GetValue(SendEmailC.FromProperty))); } set { base.SetValue(SendEmailC.FromProperty, value); } } [DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Visible)] [ValidationOption(ValidationOption.Optional)] [BrowsableAttribute(true)]
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[DescriptionAttribute("The Body property is used to specify the Body of the email message.")] public string Body { get { return (string)base.GetValue(SendEmailC.BodyProperty); } set { base.SetValue(SendEmailC.BodyProperty, value); } } [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)] [ValidationOption(ValidationOption.Required)] [Description("The SMTP host is the machine running SMTP that will send the email.The default is 'localhost'")] [Browsable(true)] public string SmtpHost { get { return ((string)(base.GetValue(SendEmailC.SmtpHostProperty))); } set { base.SetValue(SendEmailC.SmtpHostProperty, value); } } Add a new C# Sequential Workflow Console Application project to the solution called CSendEmailTest. Build the solution so the activity will be built. Open the CSendEmailTest project and the Workflow1.cs file in the Workflow Designer. Open the Toolbox and notice the new activity called SendEmailC. Drag and drop this activity onto the Workflow Designer. Click the SendEmailC activity that you just added to the workflow and view the properties. You ll see the description is the same as you added to the activity, and notice the properties that were just added. Notice the default values already provided for the required properties. These allow the user to know the type of information and also allow the validation to take place. The properties have been defined, but you still need to define what will happen when the activity is executed. To do this, open the SendEmailC project again and view the code for the activity. At the bottom of the code page, within the Partial Class, add the following function declaration: protected override ActivityExecutionStatus Execute (ActivityExecutionContext context):
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This function will override the Execute built-in function of the Activity class. This function is called when the activity is to execute. Return to the top of the code page and add the following using statement: using System.Net.Mail This statement imports the Mail class and allows you to create and send e-mail. Return to the Execute function and add the following declarations: SmtpClient clsmail = new SmtpClient(); MailMessage message = new MailMessage(); Add the following code to assign the necessary information and send the e-mail: message.From = new MailAddress(this.From); message.To.Add(this.To); if (!String.IsNullOrEmpty(this.Subject)) { message.Subject = this.Subject; } if (!String.IsNullOrEmpty(this.Body)) { message.Body = this.Body; } clsmail.Host = this.SmtpHost; clsmail.Send(message); return ActivityExecutionStatus.Closed; The completed Execute function looks like the following: protected override ActivityExecutionStatus Execute(ActivityExecutionContext context) { try { SmtpClient clsmail = new SmtpClient(); MailMessage message = new MailMessage(); message.From = new MailAddress(this.From); message.To.Add(this.To); if (!String.IsNullOrEmpty(this.Subject)) { message.Subject = this.Subject; } if (!String.IsNullOrEmpty(this.Body)) { message.Body = this.Body; } clsmail.Host = this.SmtpHost; clsmail.Send(message); return ActivityExecutionStatus.Closed; }
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catch { throw; } } Return to the CSendEmailTest project and the Workflow1.vb file. Set the properties for the SendEmailC activity accordingly and test the workflow. The address provided in the To property should receive an e-mail. As mentioned earlier in this section, you can add a Validator class to your activity. Add a new class to the SendEmailC project called SendEmailCValidator. Add the following to the using statements: using System.Workflow.ComponentModel.Compiler This class will inherit from the System.Workflow.ComponentModel.Compiler.ActivityValidator class and override the ValidateProperties function of this class. To do this, add the following lines of code: class SendEmailCValidator:ActivityValidator { public override ValidationErrorCollection ValidateProperties (ValidationManager manager,object obj) { } } The ValidateProperties function returns a ValidationErrorCollection, so you must define one within this function to return. Also define an instance of the activity that you want to validate: ValidationErrorCollection Errors = new ValidationErrorCollection(base.ValidateProperties(manager, obj)); SendEmailC sendMailActivityToBeValidated = obj as SendEmailC; Next, add code to validate the To and From properties of the activity, and add errors to the collection if necessary: if (string.IsNullOrEmpty(sendMailActivityToBeValidated.To)) { ValidationError CustomActivityValidationError = new ValidationError("To Address Not Provided", 1); Errors.Add(CustomActivityValidationError); } if (string.IsNullOrEmpty (sendMailActivityToBeValidated.From)) { ValidationError CustomActivityValidationError = new ValidationError("From Address Not Provided", 1); Errors.Add(CustomActivityValidationError); }
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