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Bind XMLNode to ASP.Net GridView

Posted on 2009-03-31
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Last Modified: 2012-05-06
I'm having difficulties binding a XMLNode to gridview.
If i use a xmlnodereader and read it into a dataset, the dataset has 4 tables.
How can i bind the dataset to the gridview to show all the info from the 4 tables?
Basically i wish to display the vehicle spec information in the grid.

I have attached example of the xmlnode i retrieve from the data supplier.

Any help greatly appreciated.
xmlnode.txt
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Question by:DeonM
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4 Comments
 
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Expert Comment

by:CraigYellick
ID: 24029860
GridView needs a structured table comprised of a predictable set of rows and columns. If your XML is not strictly row/column oriented then you'll have to do some pre-processing to get it into shape. The easiest way to accomplish this is to run an XSL-T stylesheet transformation against the original XML, to make it perfect for use with GridView.

The XML sample you provided looks pretty straightforward so this should not be a problem.
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LVL 11

Expert Comment

by:CraigYellick
ID: 24030149
Guess I should provide an example.  Here's the resulting pattern of name=value elements generated by the XSL-T below.

  <CarInfo>
    <Spec>
      <Category>Engine !AMP! Gearbox</Category>
      <Name>Accel 0-100</Name>
      <Value>11.3 Seconds</Value>
    </Spec><Spec>

Essentially you get a flattened set of spec values over all categories.
<?xml version='1.0'?>
<xsl:stylesheet 
   xmlns:xsl='http://www.w3.org/1999/XSL/Transform' 
   version='1.0'>
<xsl:output method='xml'/>
 
<xsl:template match='/'>
  <CarInfo>
   <xsl:apply-templates select='//Spec' />	
  </CarInfo>
</xsl:template>
 
<xsl:template match='Spec'>
  <Spec>
    <Category>
      <xsl:value-of select='../@name'/>
    </Category>
    <Name>
      <xsl:value-of select='@name'/>
    </Name>
    <Value>
      <xsl:value-of select='text()'/>
    </Value>
  </Spec>
</xsl:template>
 
</xsl:stylesheet>

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Author Comment

by:DeonM
ID: 24047814
Thanks for your reply, how i understand this is, I saved the example as my schema file and read it into my dataset. But i receive and error on the ReadXML line.

I receive the following error:
"Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints."

Thanks for your help, this XML confuses me.
string xmlstring = SessionValues.VehicleSpec.OuterXml.ToString();
                DataSet ds = new DataSet();
                System.IO.StringReader rdr = new System.IO.StringReader(xmlstring);
                ds.ReadXmlSchema("\\xmlschema.xsd");
                ds.ReadXml(rdr);

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LVL 11

Accepted Solution

by:
CraigYellick earned 500 total points
ID: 24049049
I did not post a complete solution. There's quite a bit more work to do. I posted an example of one way to solve your problem using an XSL transform.

The XSL transform code should be applied to the original XML data, and the results of the transform are then loaded into a dataset that is designed specifically for the transformed XML.

   Original XML -> through XSL -> New XML -> into DataSet

To use your existing code, you'll need to create a new schema XSD for that new XML. The following web page shows how to do this. You'll need an example of the XML generated by the XSL transform. You may need to adjust the resulting XML to better match your needs.

   http://msdn.microsoft.com/en-us/library/x6c1kb0s(VS.71).aspx
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