Problems Manipulating StringBuilder Output

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  • pbd22
    #1

    Problems Manipulating StringBuilder Output

    Hi.

    I have an event handler in VB.NET that gets called several times.
    The output of the event handler is XML that is being called by
    an xmlhttp request from the client.

    I am using a stringbuilder to create an XML document every time
    the event handler gets fired. Each tag is appended like so:

    Dim sbhtml As New System.Text.Str ingBuilder
    sbhtml.Append(" <Some XML Tag>")
    etc...
    Context.Respons e.ContentType = "text/xml"
    Response.Write( sbhtml.ToString )

    The problem is that the XML document gets recreated and appended every
    time the event handler fires and I get a junk error after the first
    document's parent tag is closed:

    XML Parsing Error: junk after document element

    Location: http://localhost:5223/PresentationTi..._progress.aspx
    Line Number 1, Column 191:<?xml version='1.0' encoding='ISO-8859-1'?
    ><uploads><uplo ad><filename>So meVideo.gvi</filename><bytes sent>0</
    bytessent><file size>12444894</filesize><perce nt>0</percent></upload></
    uploads><?xml version='1.0' encoding='ISO-8859-1'?...

    SO: How do I prevent this? How Do I "UPDATE" the XML document every
    time the event handler fires and not "APPPEND" a new document to the
    recently created one?

    Thanks.
    Peter

    Tags: None
    • Lloyd Sheen
      #2
      Re: Problems Manipulating StringBuilder Output


      "pbd22" <dushkin@gmail. comwrote in message
      news:1173744758 .854047.320670@ s48g2000cws.goo glegroups.com.. .
      Hi.
      >
      I have an event handler in VB.NET that gets called several times.
      The output of the event handler is XML that is being called by
      an xmlhttp request from the client.
      >
      I am using a stringbuilder to create an XML document every time
      the event handler gets fired. Each tag is appended like so:
      >
      Dim sbhtml As New System.Text.Str ingBuilder
      sbhtml.Append(" <Some XML Tag>")
      etc...
      Context.Respons e.ContentType = "text/xml"
      Response.Write( sbhtml.ToString )
      >
      The problem is that the XML document gets recreated and appended every
      time the event handler fires and I get a junk error after the first
      document's parent tag is closed:
      >
      XML Parsing Error: junk after document element
      >
      Location: http://localhost:5223/PresentationTi..._progress.aspx
      Line Number 1, Column 191:<?xml version='1.0' encoding='ISO-8859-1'?
      >><uploads><upl oad><filename>S omeVideo.gvi</filename><bytes sent>0</
      bytessent><file size>12444894</filesize><perce nt>0</percent></upload></
      uploads><?xml version='1.0' encoding='ISO-8859-1'?...
      >
      SO: How do I prevent this? How Do I "UPDATE" the XML document every
      time the event handler fires and not "APPPEND" a new document to the
      recently created one?
      >
      Thanks.
      Peter
      >
      Why not use the built in classes for building XML. If the docs are not too
      large use the DOM which is very easy to use. You can create a DOM and then
      update it using the API. Then you can write the XML to a file for
      consumption by the aspx page.

      Lloyd Sheen

        Comment

        • pbd22
          #3
          Re: Problems Manipulating StringBuilder Output

          On Mar 12, 6:19 pm, "Lloyd Sheen" <a...@b.cwrot e:
          "pbd22" <dush...@gmail. comwrote in message
          >
          news:1173744758 .854047.320670@ s48g2000cws.goo glegroups.com.. .
          >
          >
          >
          Hi.
          >
          I have an event handler in VB.NET that gets called several times.
          The output of the event handler is XML that is being called by
          an xmlhttp request from the client.
          >
          I am using a stringbuilder to create an XML document every time
          the event handler gets fired. Each tag is appended like so:
          >
          Dim sbhtml As New System.Text.Str ingBuilder
          sbhtml.Append(" <Some XML Tag>")
          etc...
          Context.Respons e.ContentType = "text/xml"
          Response.Write( sbhtml.ToString )
          >
          The problem is that the XML document gets recreated and appended every
          time the event handler fires and I get a junk error after the first
          document's parent tag is closed:
          >
          XML Parsing Error: junk after document element
          >
          Location:http://localhost:5223/PresentationTi..._progress.aspx
          Line Number 1, Column 191:<?xml version='1.0' encoding='ISO-8859-1'?
          ><uploads><uplo ad><filename>So meVideo.gvi</filename><bytes sent>0</
          bytessent><file size>12444894</filesize><perce nt>0</percent></upload></
          uploads><?xml version='1.0' encoding='ISO-8859-1'?...
          >
          SO: How do I prevent this? How Do I "UPDATE" the XML document every
          time the event handler fires and not "APPPEND" a new document to the
          recently created one?
          >
          Thanks.
          Peter
          >
          Why not use the built in classes for building XML. If the docs are not too
          large use the DOM which is very easy to use. You can create a DOM and then
          update it using the API. Then you can write the XML to a file for
          consumption by the aspx page.
          >
          Lloyd Sheen

          Thanks Lloyd.

          Very open to other approaches - this is just the one that I have
          been working with. Would you mind pointing me towards a link
          that shows me what you mean or dumping some code here for
          a quick and dirty demonstration?

          Thanks a buch.
          peter

            Comment

            • pbd22
              #4
              Re: Problems Manipulating StringBuilder Output

              On Mar 12, 6:19 pm, "Lloyd Sheen" <a...@b.cwrot e:
              "pbd22" <dush...@gmail. comwrote in message
              >
              news:1173744758 .854047.320670@ s48g2000cws.goo glegroups.com.. .
              >
              >
              >
              Hi.
              >
              I have an event handler in VB.NET that gets called several times.
              The output of the event handler is XML that is being called by
              an xmlhttp request from the client.
              >
              I am using a stringbuilder to create an XML document every time
              the event handler gets fired. Each tag is appended like so:
              >
              Dim sbhtml As New System.Text.Str ingBuilder
              sbhtml.Append(" <Some XML Tag>")
              etc...
              Context.Respons e.ContentType = "text/xml"
              Response.Write( sbhtml.ToString )
              >
              The problem is that the XML document gets recreated and appended every
              time the event handler fires and I get a junk error after the first
              document's parent tag is closed:
              >
              XML Parsing Error: junk after document element
              >
              Location:http://localhost:5223/PresentationTi..._progress.aspx
              Line Number 1, Column 191:<?xml version='1.0' encoding='ISO-8859-1'?
              ><uploads><uplo ad><filename>So meVideo.gvi</filename><bytes sent>0</
              bytessent><file size>12444894</filesize><perce nt>0</percent></upload></
              uploads><?xml version='1.0' encoding='ISO-8859-1'?...
              >
              SO: How do I prevent this? How Do I "UPDATE" the XML document every
              time the event handler fires and not "APPPEND" a new document to the
              recently created one?
              >
              Thanks.
              Peter
              >
              Why not use the built in classes for building XML. If the docs are not too
              large use the DOM which is very easy to use. You can create a DOM and then
              update it using the API. Then you can write the XML to a file for
              consumption by the aspx page.
              >
              Lloyd Sheen

              one more thing... does the fact that this XML file is intended for the
              "client", not the "aspx" page matter? this is a response to an xmlhttp
              request - the XML is not meant to exist beyond the moment the event
              handler is called.

                Comment

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