Visual Studio Magazine - Simplify XML Data Validation

XML • Validate XML Data With the XmlSchemaSet Class

Listing 4. You need to drop this code in a Web form. The XmlSchemaSet class lets you place schemas in a cache so you can use them through the XmlReaderSettings object to validate the XML data.

<%@ Page Language="C#" AutoEventWireup="true" %>
<%@ Import Namespace="System.Xml" %>
<%@ Import Namespace="System.Xml.Schema" %>

<script runat="server">
   private StringBuilder builder = new StringBuilder();
   void Page_Load(object sender, EventArgs e)
   {
      string xmlFilePath = Request.PhysicalApplicationPath + 
         @"\App_Data\Authors.xml";
         string xsdFilePath = 
            Request.PhysicalApplicationPath + 
            @"\App_Data\Authors.xsd";
      XmlSchemaSet schemaSet = new XmlSchemaSet();
         schemaSet.Add(null, xsdFilePath);
      XmlReader reader = null;
      XmlReaderSettings settings = new XmlReaderSettings();
         settings.ValidationEventHandler += new 
            ValidationEventHandler(
            this.ValidationEventHandler); 
         settings.XsdValidate = true;
         settings.Schemas = schemaSet;        
         reader = XmlReader.Create(xmlFilePath, settings);
      while (reader.Read()) 
         { 
         }
      if (builder.ToString() == String.Empty)
         Response.Write(
            "Validation completed successfully.");
      else
         Response.Write(
            "Validation Failed. <br>" + 
            builder.ToString());
   }

   void ValidationEventHandler(object sender, 
      ValidationEventArgs args)
   { 
      builder.Append("Validation error: " + args.Message + 
         "<br>");                
   } 

</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
   <title>XSD Validation using XmlSchemaSet</title>
</head>
<body>
   <form id="form1" runat="server">
   <div> 
   </div>
   </form>
</body>
</html>