RE: LINQ to XML question

[Ian Thomas]

James

Yes, building XDocuments using LINQ to XML in either VB.NET or C# in that
way is quite simple, but it’s much nicer (and easier) using XML literals in
VB.NET

(XML Literals are N/A as of C# 3.0 – I am not sure about C# 4.0). 

It’s not a big deal to add the XML Declaration as just a bit of text, but it
just seemed to me that it would be logical to be able to do this: 

 

 Dim xd As New XDeclaration("1.0", "utf-8", "yes")

        ' no - can't embed a literal for the XDeclaration

        ParkTestVideoXMLFile =

            <%= xd %>

             <TestResults>

                 <TestResult personid="0" code=<%= CurrentPatientCode %>
clinicianid="4" requestid="0" datetime=<%= CurrentTime1 %>>

                     <Test id=<%= CurrentTestName %> datetime=<%=
CurrentTime2 %>>

                          <Data type="Videofile" values=<%= sSaveFileName &
sVideoExt %>></Data>

                     </Test>

                </TestResult>

             </TestResults>

 

As my comments and the VS2010 decorations indicate, the problem is that my
XDeclaration xd cannot be used as an XML Literal. 

 

  _____  

Ian Thomas
Victoria Park, Western Australia

 

From: ozdotnet-boun...@ozdotnet.com [mailto:ozdotnet-boun...@ozdotnet.com]
On Behalf Of James Chapman-Smith
Sent: Tuesday, November 20, 2012 9:48 AM
To: ozDotNet
Subject: RE: LINQ to XML question

 

Hi Ian,

 

I might have misunderstood what you're after, but doesn't `
ParkTestVideoXMLFile.Root.Add(/* content */)` work to solve this problem?

 

Cheers.

 

James.

 

From: ozdotnet-boun...@ozdotnet.com [mailto:ozdotnet-boun...@ozdotnet.com]
On Behalf Of Ian Thomas
Sent: Monday, 19 November 2012 11:39
To: ozdotnet@ozdotnet.com
Subject: LINQ to XML question

 

I have been using LINQ to XML in VB.NET (it’s more useful to me than C#
because of XML literals), but in a very naïve and simple way. Now, I want to
make my code more flexible. 

Currently (ParkTestVideoXMLFile is of type XDocument) I do this - 

ParkTestVideoXMLFile =

             <?xml version="1.0" encoding="UTF-8" standalone="yes"?>

             <TestResults>

                 <TestResult personid="0" code=<%= CurrentPatientCode %>
clinicianid="4" requestid="0" datetime=<%= CurrentPatient_StartTime %>>

                     <Test id=<%= CurrentTestName %> datetime=<%=
CurrentTest_StartTime %>></Test>

                     <Data type="Videofile" values=<%= sSaveFileName &
sVideoExt %>></Data>

                 </TestResult>

             </TestResults>

which creates something like this – 

<?xml version="1.0" encoding="utf-8" standalone="yes"?>

<TestResults>

  <TestResult personid="0" code="1235" clinicianid="4" requestid="0"
datetime="2012-11-09T19:10:39.5477585+08:00">

    <Test id="ProSupLeft"
datetime="2012-11-09T19:10:48.1862526+08:00"></Test>

    <Data type="Videofile"
values="VR_1235_ProSupLeft_2012-11-09_191045.WMV"></Data>

  </TestResult>

<!-- I would like to add many additional TestResult data here -->

</TestResults>

After writing the file to disk (ParkTestVideoXMLFile.Save(CurrentXMLFile,
SaveOptions.None)) I would like to insert additional TestResult data at the
location highlighted, at some future time. Users may terminate the program
at any time, sometimes electing not to save the most recent test results.
What would be your suggestions for doing this? Or, should I just retain each
Test’s variables in arrays and construct the whole XDocument at the time of
exit? 
I guess the simple question is: how do I insert? Do I have to traverse the
XML tree, and is this more complicated than simply maintaining a few arrays?
The memory load for this data is tiny. 
  _____  


Ian Thomas
Victoria Park, Western Australia