.Net EmailServe Class for use in Classic ASP

Posted in Tutorials

The EmailServe class was designed to be accessed from VBScript code. Read more on using .Net DLLs in classic ASP in my old Registering a .NET DLL to COM tutorial. EmailServe goes through the process of sending the message just as you would in a standard ASP.NET page. The difference is in the handling of the various collections, such as the Recipient's list and the Attachment's list. All of these lists are handled as the .NET object, ArrayList. ArrayList does not translate into anything in VBScript. As a result, all of our public properties require functions to allow our calling ASP page to access them. Along these same lines is the "Get" portion of the property. That little chunk of code turns our array list into a simple string for use in ASP.

'-----------------------TO----------------------------- Private _Recipients As ArrayList 'Stores MailAddresses Public Property Recipients() As String Get Dim rawout As String = "" For Each item As MailAddress In _Recipients rawout &= item.Address & "; " Next rawout = rawout.Substring(0, rawout.Length - 2) Return rawout End Get Set(ByVal value As String) Me._Recipients.Add(New MailAddress(value)) End Set End Property Public Sub AddRecipient(ByVal Address As String, ByVal Name As String) 'For use in plain ASP Me._Recipients.Add(New MailAddress(Address, Name)) End Sub

Most of our variables that are exposed to ASP work this way. The only one that is more complicated is the Attachments list because the attachments list has to locate the file on the server. The property I have written also generates a string explaining what files are attached to this email.

Private _Files As ArrayList 'Attachments! Public Property Files() As String Get Dim rawout As String = "" For Each item As Attachment In _Files rawout &= item.Name Next Return rawout End Get Set(ByVal value As String) Dim file As String = System.Web.Hosting.HostingEnvironment.MapPath(value) Dim attach As New Attachment(file) Me._Files.Add(attach) 'Optional code that appends information about the attached files to our email If Me._AttachmentInfo <> "Attached Files: " Then Me._AttachmentInfo &= " / " End If Me._AttachmentInfo &= System.IO.Path.GetFileName(file) & " (" & System.IO.File.GetCreationTime(file).Date & ")" End Set End Property

I've created a little wrapper function in this class for dealing with the creation of the SmtpClient object responsible for sending the email. This function ensures that if all the values aren't passed to the class the class will use the default values to send from the local machine.

'---------------------PRIVATE FUNCTIONS--------------------- Private Function SmtpSetup(ByVal server As String, ByVal port As Integer, ByVal user As String, ByVal pass As String) As SmtpClient Dim serve As New SmtpClient() If Not String.IsNullOrEmpty(server) Then serve.Host = server End If If Not port = 0 Then serve.Port = port End If If Not String.IsNullOrEmpty(user) Then serve.Credentials = New NetworkCredential(user, pass) End If Return serve End Function

The most important part of the class is of course our actual send function.

'--------------------SEND FUNCTIONS-------------------- 'Do all the work this object is intended for. Public Function Send() As Boolean Try Dim message As New MailMessage() message.From = New MailAddress(Me._Sender, Me._SenderName) For Each item As MailAddress In Me._Recipients message.To.Add(item) Next For Each item As MailAddress In Me._CCs message.CC.Add(item) Next For Each item As MailAddress In Me._BCCs message.Bcc.Add(item) Next For Each item As Attachment In Me._Files message.Attachments.Add(item) Next message.Subject = Me._Subject Dim strBody As String = Me._Body 'If settings are correct and there are attachments, write out information on those attachments. If Me._ShowFileInfo And Me._AttachmentInfo <> "Attached Files: " And Not Me._IsBodyHtml Then strBody &= Environment.NewLine & Environment.NewLine & Me._AttachmentInfo ElseIf Me._ShowFileInfo And Me._AttachmentInfo <> "Attached Files: " Then strBody &= "<br><br><b style=""color:#c0c0c0;font-size:10px;"">" & Me._AttachmentInfo & "</b>" End If message.Body = strBody message.IsBodyHtml = Me._IsBodyHtml Dim client As SmtpClient = SmtpSetup(Me._Server, Me._Port, Me._Username, Me._Password) client.Send(message) Catch ex As Exception Me._Errors = ex.Message Return False End Try Return True End Function