Declare all the variables you will use, and then use them. in VB.NET

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Declare all the variables you will use, and then use them.
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Dim Dim Dim Dim Dim products As XmlDocument prodDeclare As XmlDeclaration rootSet As XmlElement supplier As XmlElement product As XmlElement
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13: XML
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Dim productValue As XmlElement Dim comment As XmlComment ' ----- Create the document with a valid declaration. products = New XmlDocument prodDeclare = products.CreateXmlDeclaration("1.0", _ Nothing, String.Empty) products.InsertBefore(prodDeclare, products.DocumentElement) ' ----- Create the root element, <productList>. rootSet = products.CreateElement("productList") products.InsertAfter(rootSet, prodDeclare) ' ----- Add a nice comment. comment = products.CreateComment( _ " We currently sell these items. ") rootSet.AppendChild(comment) ' ------ Create the supplier element, <supplier>. ' Include the attributes. supplier = products.CreateElement("supplier") supplier.SetAttribute("ID", "652") supplier.SetAttribute("fullName", "Beverages R Us") rootSet.AppendChild(supplier) ' ----- Create the product element, <product>, with the ' subordinate data values. product = products.CreateElement("product") product.SetAttribute("ID", "1") product.SetAttribute("available", "yes") supplier.AppendChild(product) productValue = products.CreateElement("productName") productValue.InnerText = "Chai" product.AppendChild(productValue) productValue = products.CreateElement("category") productValue.InnerText = "Beverages" product.AppendChild(productValue) productValue = products.CreateElement("unitPrice") productValue.InnerText = "18.00" product.AppendChild(productValue)
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It really works, too. To prove it, put this code in the Click event of a button, and end it with the following line:
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products.Save("c:\products.xml")
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Run the program and view the c:\products.xml file to see the XML product data. There are many different ways to use the XML classes to create an XML document in memory. For instance, although I used the SetAttribute method to add attributes to the supplier and product nodes, I could have created separate attribute objects, and appended them onto these nodes, just like I did for the main elements.
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Dim attrData As XmlAttribute attrData = products.CreateAttribute("ID") attrData.Value = "652" supplier.SetAttributeNode(attrData)
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So, this is nice and all, but what if you already have some XML in a file, and you just want to load it into an XmlDocument object Simply use the XmlDocument object s Load method.
Dim products As XmlDocument products = New XmlDocument products.Load("c:\products.xml")
For those instances where you just want to read or write some XML from or to a file, and you don t care much about manipulating it in memory, the XmlTextReader and XmlTextWriter classes let you quickly read and write XML data via a text stream. But if you are going to do things with the XML data in your program, the Load and Save methods of the XmlDocument object are a better choice.
Finding Needles and Haystacks
In our sample data, all of the products appear in supplier groups. If we just want a list of products, regardless of supplier, we ask the XmlDocument object to supply that data via an XmlNodeList object.
Dim justProducts As XmlNodeList Dim oneProduct As XmlNode ' ----- First, get the list. justProducts = products.GetElementsByTagName("product") ' ----- Then do something with them. For Each oneProduct In justProducts ' ----- Put interesting code here. Next oneProduct MsgBox("Processed " & justProducts.Count.ToString( ) & _ " product(s).")
For a more complex selection of nodes within the document, the System.Xml.XPath namespace implements the XPath searching language, which gives you increased flexibility in locating items. The Visual Studio documentation describes the methods and searching syntax used with these classes.
Schema Veri cation
An XmlDocument object can hold any type of random yet valid XML content, but you can also verify the document against an XSD schema. If your XML document refers to an XSD schema, includes a DTD, or uses XDR (XML Data Reduced schemas, similar to XSD), an XmlReader, when configured with the appropriate XmlReaderSettings, will properly compare your XML data against the defined rules, and throw an exception if there s a problem.
Dim Dim Dim Dim
products As New XmlDocument xmlRead As XmlTextReader withVerify As New XmlReaderSettings xmlReadGood As XmlReader
' ----- Open the XML file and process schemas ' referenced within the content. withVerify.ValidationType = ValidationType.Schema xmlRead = New XmlTextReader("c:\temp\products.xml") xmlReadGood = XmlReader.Create(xmlRead, withVerify) ' ----- Load content, or throw exception on ' validation failure. products.Load(xmlReadGood) ' ----- Clean up. xmlReadGood.Close( ) xmlRead.Close( )
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