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Using XSLT for sending emails

I am working on a website for a client and one of their requirements was to
have a mailing list. I decided to XSLT to transform "templates" to HTML so
that editing was very easy and less time consuming. I keep getting the
following error when I submit my email to their site.

System.Xml.Xsl. XslTransformExc eption: Cannot find the script or external
object that implements prefix 'ext:MailingLis t'. at
System.Xml.Xsl. Runtime.XmlQuer yContext.Invoke XsltLateBoundFu nction(String
name, String namespaceUri, IList`1[] args) at (XmlQueryRuntim e
{urn:schemas-microsoft-com:xslt-debug}runtime) at Root(XmlQueryRu ntime
{urn:schemas-microsoft-com:xslt-debug}runtime) at Execute(XmlQuer yRuntime
{urn:schemas-microsoft-com:xslt-debug}runtime) at
System.Xml.Xsl. ExecuteDelegate .Invoke(XmlQuer yRuntime runtime) at
System.Xml.Xsl. XmlILCommand.Ex ecute(Object defaultDocument , XmlResolver
dataSources, XsltArgumentLis t argumentList, XmlSequenceWrit er results) at
System.Xml.Xsl. XmlILCommand.Ex ecute(Object defaultDocument , XmlResolver
dataSources, XsltArgumentLis t argumentList, XmlWriter writer, Boolean
closeWriter) at System.Xml.Xsl. XmlILCommand.Ex ecute(IXPathNav igable
contextDocument , XmlResolver dataSources, XsltArgumentLis t argumentList,
XmlWriter results) at
System.Xml.Xsl. XslCompiledTran sform.Transform (IXPathNavigabl e input,
XsltArgumentLis t arguments, XmlWriter results) at
BusinessLogic.E mailTemplate.Se ndEmailMessage( String emailTo, String
xslTemplate, IDictionary dictionary) at
BusinessLogic.M ailingList.Send MailingListVeri fication() at
BusinessLogic.M ailingList.Add( ) at _Default.cmdSub mitEmail_Click( Object
sender, ImageClickEvent Args e)
at System.Xml.Xsl. Runtime.XmlQuer yContext.Invoke XsltLateBoundFu nction(String
name, String namespaceUri, IList`1[] args) at (XmlQueryRuntim e
{urn:schemas-microsoft-com:xslt-debug}runtime) at Root(XmlQueryRu ntime
{urn:schemas-microsoft-com:xslt-debug}runtime) at Execute(XmlQuer yRuntime
{urn:schemas-microsoft-com:xslt-debug}runtime) at
System.Xml.Xsl. ExecuteDelegate .Invoke(XmlQuer yRuntime runtime) at
System.Xml.Xsl. XmlILCommand.Ex ecute(Object defaultDocument , XmlResolver
dataSources, XsltArgumentLis t argumentList, XmlSequenceWrit er results) at
System.Xml.Xsl. XmlILCommand.Ex ecute(Object defaultDocument , XmlResolver
dataSources, XsltArgumentLis t argumentList, XmlWriter writer, Boolean
closeWriter) at System.Xml.Xsl. XmlILCommand.Ex ecute(IXPathNav igable
contextDocument , XmlResolver dataSources, XsltArgumentLis t argumentList,
XmlWriter results) at
System.Xml.Xsl. XslCompiledTran sform.Transform (IXPathNavigabl e input,
XsltArgumentLis t arguments, XmlWriter results) at
BusinessLogic.E mailTemplate.Se ndEmailMessage( String emailTo, String
xslTemplate, IDictionary dictionary) at
BusinessLogic.M ailingList.Send MailingListVeri fication() at
BusinessLogic.M ailingList.Add( ) at _Default.cmdSub mitEmail_Click( Object
sender, ImageClickEvent Args e)

Here is my XSLT file:

<?xml version="1.0" encoding="UTF-8" ?>
<xsl:styleshe et version="1.0"
xmlns:xsl="http ://www.w3.org/1999/XSL/Transform"
xmlns:MailingLi st="ext:Mailing List">
<xsl:template match="/">
<html>
<head>
<title>The SomeSite Campaign</title>
</head>
<body>
<P>
Thank you for your interest in the The SomeSite Campaign,
</P>
In order for you to receive emails from our mailing list, you must
first confirm your email address by clicking on the link below.<BR />
<a>
<xsl:attribut e name="href">

http://www.somesite.co m/subscriptions/ConfirmMailing. aspx?email=<xsl :value-of
select="Mailing List:Email()" />&validation=

</xsl:attribute>h ttp://www.SomeSite.co m/subscriptions/ConfirmMailing. aspx?email=<xsl :value-of select="Mailing List:Email()" />&validation=
</a>
<P>
Regards,
The SomeSite Campaign
</P>
</body>
</html>
</xsl:template>
</xsl:stylesheet>

If I take out <xsl:value-of select="Mailing List:Email()" /> statements an
email is generated and sent, but it just contains HTML. Here is my mailing
list class in which there is a email address and verification hash.

Imports Microsoft.Visua lBasic

Namespace BusinessLogic

Public Class MailingList
Inherits BusinessLogic.D ataAccessBase

Private pEmail As String
Private pHash As String

Public Property Email() As String
Get
Return pEmail
End Get
Set(ByVal value As String)
If Validation.Vali dateEmail(value ) = False Then Throw New
Exception(Resou rces.StringReso urces.EmailAddr essInvalidForma t)
pEmail = value
End Set
End Property

Public Property Hash() As String
Get
Return pHash
End Get
Set(ByVal value As String)
pHash = value
End Set
End Property

Public Sub New(ByVal email As String, ByVal hash As String)
Me.Email = email
Me.Hash = hash
End Sub

Public Sub New()
End Sub

''' <summary>
''' Adds a new email address to the mailing list.
''' </summary>
Public Sub Add()
Dim dbConn As DataAccess.Data AccessBase =
DataAccess.Data AccessBaseHelpe r.GetDataAccess Layer
Dim pr As DataAccess.Data AccessBase.Proc edureResults
pr = dbConn.AddMaili ngList(pEmail, pHash)

Me.pErrorCode = pr.ErrorCode
Me.pRowCount = pr.RowCount

SendMailingList Verification()
End Sub

''' <summary>
''' Verifies an email address and marks it as valid.
''' </summary>
Public Sub Verify()
Dim dbConn As DataAccess.Data AccessBase =
DataAccess.Data AccessBaseHelpe r.GetDataAccess Layer
Dim pr As DataAccess.Data AccessBase.Proc edureResults
pr = dbConn.VerifyMa ilingList(pEmai l, pHash)

Me.pErrorCode = pr.ErrorCode
Me.pRowCount = pr.RowCount
End Sub

''' <summary>
''' Removes an email address from the mailing list after validating
that it exists.
''' </summary>
Public Sub Delete()
Dim dbConn As DataAccess.Data AccessBase =
DataAccess.Data AccessBaseHelpe r.GetDataAccess Layer
Dim pr As DataAccess.Data AccessBase.Proc edureResults
pr = dbConn.DeleteMa ilingList(pEmai l, pHash)

Me.pErrorCode = pr.ErrorCode
Me.pRowCount = pr.RowCount
End Sub

Private Sub SendMailingList Verification()
Dim hashTbl As New Hashtable
hashTbl("ext:Li st") = Me

EmailTemplate.S endEmailMessage (pEmail,
System.Web.Http Context.Current .Server.MapPath ("~/public/templates/AddMailingList. xslt"), hashTbl)
End Sub

End Class

End Namespace

Finally, here is my email class in which I am trying to insert my data into
the XSLT file so that I can send it.

Imports Microsoft.Visua lBasic
Imports System.Collecti ons
Imports System.Xml
Imports System.Xml.Xsl
Imports System.Xml.XPat h
Imports System.Text
Imports System.Net.Mail

Namespace BusinessLogic

Public Class EmailTemplate

Public Shared Sub SendEmailMessag e(ByVal emailTo As String, ByVal
xslTemplate As String, ByVal dictionary As IDictionary)

Dim objXSLT As New XslCompiledTran sform
objXSLT.Load(xs lTemplate)

Dim xmlDoc As New XmlDocument
xmlDoc.AppendCh ild(xmlDoc.Crea teElement("Docu mentRoot"))
Dim xPathNav As XPathNavigator = xmlDoc.CreateNa vigator

Dim xslArg As New XsltArgumentLis t
If dictionary IsNot Nothing Then
For Each entry As DictionaryEntry In dictionary
xslArg.AddExten sionObject(entr y.Key.ToString, entry.Value)
Next
End If

Dim emlBuilder As New StringBuilder
Dim xmlWriter As New XmlTextWriter(N ew
System.IO.Strin gWriter(emlBuil der))

objXSLT.Transfo rm(xPathNav, xslArg, xmlWriter)

Dim subjText As String
Dim bodyText As String

Dim xEmailDoc As New XmlDocument
xEmailDoc.LoadX ml(emlBuilder.T oString)
Dim titleNode As XmlNode = xEmailDoc.Selec tSingleNode("//title")

subjText = titleNode.Inner Text

Dim bodynode As XmlNode = xEmailDoc.Selec tSingleNode("//body")

bodyText = bodynode.InnerX ml
If bodyText.Length > 0 Then
bodyText = bodyText.Replac e("&", "&")
End If

Dim oMail As New MailMessage(Con figuration.SMTP Sender, emailTo)
oMail.Subject = subjText
oMail.Body = bodyText
oMail.BodyEncod ing = Encoding.UTF8
oMail.IsBodyHtm l = True

Dim oSMTP As New SmtpClient(Conf iguration.SMTPS erver)
oSMTP.Credentia ls = New
System.Net.Netw orkCredential(C onfiguration.SM TPUserName,
Configuration.S MTPPassword)
oSMTP.Send(oMai l)
End Sub

End Class

End Namespace

I saw some examples of people using dictionary or hash table objects to
contain their data so that they only needed on so-called template parser. I
am trying to do the same as I will have 10-15 different templates when the
site is finished. Thanks for any help.

- Nick
Jun 3 '06 #1
1 2740
Hello Nick,

And where is your "ext" namespace declaration? You need specify it, the error
point exactly on it

N> I am working on a website for a client and one of their requirements
N> was to have a mailing list. I decided to XSLT to transform
N> "templates" to HTML so that editing was very easy and less time
N> consuming. I keep getting the following error when I submit my email
N> to their site.
N>
N> System.Xml.Xsl. XslTransformExc eption: Cannot find the script or
N> external
N> object that implements prefix 'ext:MailingLis t'. at
N> System.Xml.Xsl. Runtime.XmlQuer yContext.Invoke XsltLateBoundFu nction(St
N> ring
N> name, String namespaceUri, IList`1[] args) at (XmlQueryRuntim e
N> {urn:schemas-microsoft-com:xslt-debug}runtime) at
N> Root(XmlQueryRu ntime
N> {urn:schemas-microsoft-com:xslt-debug}runtime) at
N> Execute(XmlQuer yRuntime
N> {urn:schemas-microsoft-com:xslt-debug}runtime) at
N> System.Xml.Xsl. ExecuteDelegate .Invoke(XmlQuer yRuntime runtime) at
N> System.Xml.Xsl. XmlILCommand.Ex ecute(Object defaultDocument ,
N> XmlResolver
N> dataSources, XsltArgumentLis t argumentList, XmlSequenceWrit er
N> results) at
N> System.Xml.Xsl. XmlILCommand.Ex ecute(Object defaultDocument ,
N> XmlResolver
N> dataSources, XsltArgumentLis t argumentList, XmlWriter writer, Boolean
N> closeWriter) at System.Xml.Xsl. XmlILCommand.Ex ecute(IXPathNav igable
N> contextDocument , XmlResolver dataSources, XsltArgumentLis t
N> argumentList,
N> XmlWriter results) at
N> System.Xml.Xsl. XslCompiledTran sform.Transform (IXPathNavigabl e input,
N> XsltArgumentLis t arguments, XmlWriter results) at
N> BusinessLogic.E mailTemplate.Se ndEmailMessage( String emailTo, String
N> xslTemplate, IDictionary dictionary) at
N> BusinessLogic.M ailingList.Send MailingListVeri fication() at
N> BusinessLogic.M ailingList.Add( ) at
N> _Default.cmdSub mitEmail_Click( Object
N> sender, ImageClickEvent Args e)
N> at
N> System.Xml.Xsl. Runtime.XmlQuer yContext.Invoke XsltLateBoundFu nction(St
N> ring
N> name, String namespaceUri, IList`1[] args) at (XmlQueryRuntim e
N> {urn:schemas-microsoft-com:xslt-debug}runtime) at
N> Root(XmlQueryRu ntime
N> {urn:schemas-microsoft-com:xslt-debug}runtime) at
N> Execute(XmlQuer yRuntime
N> {urn:schemas-microsoft-com:xslt-debug}runtime) at
N> System.Xml.Xsl. ExecuteDelegate .Invoke(XmlQuer yRuntime runtime) at
N> System.Xml.Xsl. XmlILCommand.Ex ecute(Object defaultDocument ,
N> XmlResolver
N> dataSources, XsltArgumentLis t argumentList, XmlSequenceWrit er
N> results) at
N> System.Xml.Xsl. XmlILCommand.Ex ecute(Object defaultDocument ,
N> XmlResolver
N> dataSources, XsltArgumentLis t argumentList, XmlWriter writer, Boolean
N> closeWriter) at System.Xml.Xsl. XmlILCommand.Ex ecute(IXPathNav igable
N> contextDocument , XmlResolver dataSources, XsltArgumentLis t
N> argumentList,
N> XmlWriter results) at
N> System.Xml.Xsl. XslCompiledTran sform.Transform (IXPathNavigabl e input,
N> XsltArgumentLis t arguments, XmlWriter results) at
N> BusinessLogic.E mailTemplate.Se ndEmailMessage( String emailTo, String
N> xslTemplate, IDictionary dictionary) at
N> BusinessLogic.M ailingList.Send MailingListVeri fication() at
N> BusinessLogic.M ailingList.Add( ) at
N> _Default.cmdSub mitEmail_Click( Object
N> sender, ImageClickEvent Args e)
N> Here is my XSLT file:
N>
N> <?xml version="1.0" encoding="UTF-8" ?>
N> <xsl:styleshe et version="1.0"
N> xmlns:xsl="http ://www.w3.org/1999/XSL/Transform"
N> xmlns:MailingLi st="ext:Mailing List">
N> <xsl:template match="/">
N> <html>
N> <head>
N> <title>The SomeSite Campaign</title>
N> </head>
N> <body>
N> <P>
N> Thank you for your interest in the The SomeSite Campaign,
N> </P>
N> In order for you to receive emails from our mailing list, you
N> must
N> first confirm your email address by clicking on the link below.<BR />
N> <a>
N> <xsl:attribut e name="href">
N> http://www.somesite.co m/subscriptions/ConfirmMailing. aspx?email=<xsl :
N> value-of select="Mailing List:Email()" />&validation=
N>
N> </xsl:attribute>http://www.SomeSite.com/subscriptions/ConfirmMailing.
N> aspx?email=<xsl :value-of select="Mailing List:Email()" />&validation=
N> </a>
N> <P>
N> Regards,
N> The SomeSite Campaign
N> </P>
N> </body>
N> </html>
N> </xsl:template>
N> </xsl:stylesheet>
N>
N> If I take out <xsl:value-of select="Mailing List:Email()" />
N> statements an email is generated and sent, but it just contains HTML.
N> Here is my mailing list class in which there is a email address and
N> verification hash.
N>
N> Imports Microsoft.Visua lBasic
N>
N> Namespace BusinessLogic
N>
N> Public Class MailingList
N> Inherits BusinessLogic.D ataAccessBase
N> Private pEmail As String
N> Private pHash As String
N> Public Property Email() As String
N> Get
N> Return pEmail
N> End Get
N> Set(ByVal value As String)
N> If Validation.Vali dateEmail(value ) = False Then Throw
N> New
N> Exception(Resou rces.StringReso urces.EmailAddr essInvalidForma t)
N> pEmail = value
N> End Set
N> End Property
N> Public Property Hash() As String
N> Get
N> Return pHash
N> End Get
N> Set(ByVal value As String)
N> pHash = value
N> End Set
N> End Property
N> Public Sub New(ByVal email As String, ByVal hash As String)
N> Me.Email = email
N> Me.Hash = hash
N> End Sub
N> Public Sub New()
N> End Sub
N> ''' <summary>
N> ''' Adds a new email address to the mailing list.
N> ''' </summary>
N> Public Sub Add()
N> Dim dbConn As DataAccess.Data AccessBase =
N> DataAccess.Data AccessBaseHelpe r.GetDataAccess Layer
N> Dim pr As DataAccess.Data AccessBase.Proc edureResults
N> pr = dbConn.AddMaili ngList(pEmail, pHash)
N> Me.pErrorCode = pr.ErrorCode
N> Me.pRowCount = pr.RowCount
N> SendMailingList Verification()
N> End Sub
N> ''' <summary>
N> ''' Verifies an email address and marks it as valid.
N> ''' </summary>
N> Public Sub Verify()
N> Dim dbConn As DataAccess.Data AccessBase =
N> DataAccess.Data AccessBaseHelpe r.GetDataAccess Layer
N> Dim pr As DataAccess.Data AccessBase.Proc edureResults
N> pr = dbConn.VerifyMa ilingList(pEmai l, pHash)
N> Me.pErrorCode = pr.ErrorCode
N> Me.pRowCount = pr.RowCount
N> End Sub
N> ''' <summary>
N> ''' Removes an email address from the mailing list after
N> validating
N> that it exists.
N> ''' </summary>
N> Public Sub Delete()
N> Dim dbConn As DataAccess.Data AccessBase =
N> DataAccess.Data AccessBaseHelpe r.GetDataAccess Layer
N> Dim pr As DataAccess.Data AccessBase.Proc edureResults
N> pr = dbConn.DeleteMa ilingList(pEmai l, pHash)
N> Me.pErrorCode = pr.ErrorCode
N> Me.pRowCount = pr.RowCount
N> End Sub
N> Private Sub SendMailingList Verification()
N> Dim hashTbl As New Hashtable
N> hashTbl("ext:Li st") = Me
N> EmailTemplate.S endEmailMessage (pEmail,
N> System.Web.Http Context.Current .Server.MapPath ("~/public/templates/Add
N> MailingList.xsl t"), hashTbl)
N> End Sub
N> End Class
N>
N> End Namespace
N>
N> Finally, here is my email class in which I am trying to insert my
N> data into the XSLT file so that I can send it.
N>
N> Imports Microsoft.Visua lBasic
N> Imports System.Collecti ons
N> Imports System.Xml
N> Imports System.Xml.Xsl
N> Imports System.Xml.XPat h
N> Imports System.Text
N> Imports System.Net.Mail
N> Namespace BusinessLogic
N>
N> Public Class EmailTemplate
N>
N> Public Shared Sub SendEmailMessag e(ByVal emailTo As String,
N> ByVal xslTemplate As String, ByVal dictionary As IDictionary)
N>
N> Dim objXSLT As New XslCompiledTran sform
N> objXSLT.Load(xs lTemplate)
N> Dim xmlDoc As New XmlDocument
N> xmlDoc.AppendCh ild(xmlDoc.Crea teElement("Docu mentRoot"))
N> Dim xPathNav As XPathNavigator = xmlDoc.CreateNa vigator
N> Dim xslArg As New XsltArgumentLis t
N> If dictionary IsNot Nothing Then
N> For Each entry As DictionaryEntry In dictionary
N> xslArg.AddExten sionObject(entr y.Key.ToString,
N> entry.Value)
N> Next
N> End If
N> Dim emlBuilder As New StringBuilder
N> Dim xmlWriter As New XmlTextWriter(N ew
N> System.IO.Strin gWriter(emlBuil der))
N> objXSLT.Transfo rm(xPathNav, xslArg, xmlWriter)
N>
N> Dim subjText As String
N> Dim bodyText As String
N> Dim xEmailDoc As New XmlDocument
N> xEmailDoc.LoadX ml(emlBuilder.T oString)
N> Dim titleNode As XmlNode =
N> xEmailDoc.Selec tSingleNode("//title")
N> subjText = titleNode.Inner Text
N>
N> Dim bodynode As XmlNode =
N> xEmailDoc.Selec tSingleNode("//body")
N>
N> bodyText = bodynode.InnerX ml
N> If bodyText.Length > 0 Then
N> bodyText = bodyText.Replac e("&", "&")
N> End If
N> Dim oMail As New MailMessage(Con figuration.SMTP Sender,
N> emailTo)
N> oMail.Subject = subjText
N> oMail.Body = bodyText
N> oMail.BodyEncod ing = Encoding.UTF8
N> oMail.IsBodyHtm l = True
N> Dim oSMTP As New SmtpClient(Conf iguration.SMTPS erver)
N> oSMTP.Credentia ls = New
N> System.Net.Netw orkCredential(C onfiguration.SM TPUserName,
N> Configuration.S MTPPassword)
N> oSMTP.Send(oMai l)
N> End Sub
N> End Class
N>
N> End Namespace
N>
N> I saw some examples of people using dictionary or hash table objects
N> to contain their data so that they only needed on so-called template
N> parser. I am trying to do the same as I will have 10-15 different
N> templates when the site is finished. Thanks for any help.
N>
N> - Nick
N>
---
WBR,
Michael Nemtsev :: blog: http://spaces.msn.com/laflour

"At times one remains faithful to a cause only because its opponents do not
cease to be insipid." (c) Friedrich Nietzsche
Jun 3 '06 #2

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