Article:		The .NET Schema Object Model
Subject:		Targeting a nested child element
Date:		2003-02-25 06:10:51
From:		Wendy Attenberger
Response to: Targeting a nested child element
I used the following line in vb.net: Dim ct As XmlSchemaComplexType = parentElement.ElementType to replace this one in c#: XmlSchemaComplexType ct = parentElem.ElementType as XmlSchemaComplexType On the next line, I try to access the LocalElements collection - but I don't see a LocalElements collection in my intellisense. (I see Particle, Qualified Name, etc.) I don't think I have the right syntax in vb.net. You wouldn't have to have any ideas on the syntax for vb.net? Thanks again...this has been extremely helpful. I have found very little sample code in this area.

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• Targeting a nested child element
  2003-02-25 14:00:11 Priyamvadha Lakshminarayanan
  
  My mistake, the LocalElements property is not available in Version 1 of the .NET Framework.

  
  Try the following sample instead:

  
  foreach (XmlSchemaElement parentElement in schema.Elements.Values) {

  
  XmlSchemaComplexType ct = parentElement.ElementType as XmlSchemaComplexType; //Casting to complex type
  if (ct != null) {
  XmlSchemaSequence seq = (XmlSchemaSequence)ct.ContentTypeParticle; //Assuming it’s a sequence of elements
  foreach(XmlSchemaParticle p in seq.Items) {
  XmlSchemaElement elem = p as XmlSchemaElement; //Check if particle in seq is XmlSchemaElement
  if (elem != null)
  Console.WriteLine(elem.QualifiedName.ToString());
  }
  }

  
  Thanks,
  Priya
  
  

  • Targeting a nested child element
    2003-05-29 13:22:20 Carol Skelly
    
    Hi..

    
    I also need to accomplish this in Vb.Net -- has anyone been successful with this?

    
    Also -- as you said the post-complilation Elements collection only contains top-level 'elements' -- so wouldn't we need to examine the Items collection instead to find any 'complextypes' or 'simpletypes'? ie:

    
    foreach (XmlSchemaElement parentElement in schema.Items) {

    
    Thanks for this great article! And please let me know if you can shed any light on the matter of traversing nested schema elements. Thanks!

    
    
    
    

    • Targeting a nested child element
      2004-11-15 06:36:28 Qoheleth
      
      VB.NET version of the above code would be

      
      Dim parentElement As XmlSchemaElement
      For Each parentElement In schema.Elements.Values
      'Try Casting to complex type
      Dim ct As XmlSchemaComplexType
      Try
      ct = DirectCast(parentElement.ElementType, XmlSchemaComplexType)
      Catch ex As InvalidCastException
      ct = Nothing
      End Try
      If Not ct Is Nothing Then
      Dim seq As XmlSchemaSequence = DirectCast(ct.ContentTypeParticle, XmlSchemaSequence)

      
      'Assuming it’s a sequence of elements
      Dim p As XmlSchemaParticle
      For Each p In seq.Items
      'Check if particle in seq is XmlSchemaElement
      Dim elem As XmlSchemaElement
      Try
      elem = DirectCast(p, XmlSchemaElement)
      Catch ex As InvalidCastException
      elem = Nothing
      End Try

      
      If Not elem Is Nothing Then
      Console.WriteLine(elem.QualifiedName.ToString());
      End If
      Next
      End If
      Next

      
      
      
      
      

    • Targeting a nested child element
      2003-05-29 14:53:04 Priyamvadha Lakshminarayanan
      
      To access nested elements, you would need to traverse down the content model of the parent element as shown in my previous post.

      
      The elements in the post-compilation Elements collection each have an ElementType property which exposes the compiled complex type or simple type of that element. To get to the child elements, you need to navigate down the complex type.

      
      The items collection is used to add items to the schema prior to compilation.