Getting type information using xsd

serkan sendur 0 234 Views

To make some operations on XML elements you have to know their types. This snippet is about getting the types of these elements.

// this is default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Xml.Schema;
using System.Xml;
using System.Xml.XPath;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        GetTypes();
    }
    private  void GetTypes()
    {
        XmlTextReader tr = new XmlTextReader(Server.MapPath("~/App_Data/XMLFile.xml"));
        XmlValidatingReader vr = new XmlValidatingReader(tr);

        vr.Schemas.Add(null,Server.MapPath("~/App_Data/XMLFile.xsd"));
        vr.ValidationType = ValidationType.Schema;
        vr.ValidationEventHandler += new ValidationEventHandler(ValidationCallBack);

        while (vr.Read())
        {
            if (vr.NodeType == XmlNodeType.Element)
            {
                if (vr.SchemaType is XmlSchemaComplexType)
                {
                    XmlSchemaComplexType sct = (XmlSchemaComplexType)vr.SchemaType;
                    Response.Write("<div style='color:red'>" + vr.Name + " " + sct.Name + "</div>");
                }
                else
                {
                    object value = vr.ReadTypedValue();
                    try
                    {
                    Response.Write("<div style='color:blue'>" + vr.Name + " : " + value.GetType().Name + " " + value.ToString() + "</div>");
                    }
                    catch
                    {
                    }
                }
            }
        }
    }
    private  void ValidationCallBack(object sender, ValidationEventArgs args)
    {
        Response.Write("***validation error</br>");
        Response.Write("Severity : " + args.Severity);
        Response.Write("Message : "+ args.Message);
    }
}
// this is default.aspx, it has basically nothing

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    </form>
</body>
</html>

// this is my xml file prototype
<?xml version="1.0" encoding="utf-8" ?>
<man>
  <length>180</length>
  <eyeColor>Green</eyeColor>
  <BOD>1981-08-10</BOD>
</man>

// this is my xsd file for my xml file
<?xml version="1.0" encoding="utf-8"?>
<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="man">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="length" type="xs:int" />
        <xs:element name="eyeColor" type="xs:string" />
        <xs:element name="BOD" type="xs:boolean" />
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>

// when you run the application the webpage displays the following 

man 
length : Int32 180
eyeColor : String Green
***validation error
Severity : ErrorMessage : The 'BOD' element has an invalid value according to its data type. 
it was able to get types from the xsd file and also validated the document against it.
Member Avatar for deepalijain
deepalijain 0 Newbie Poster

good artical

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