Using XPath to get string value, integer value and boolean value

   
 
//---------------------------------------------------------------------
// File: XPathValidator.cs
// 
// Summary: 
//
// Copyright (c) http://bizunitextensions.codeplex.com. All rights reserved.
//
// THIS CODE AND INFORMATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
// KIND, WHETHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
// PURPOSE.
//---------------------------------------------------------------------

using System;
using System.Xml.XPath;
using System.Xml;

namespace BizUnit.Extensions.Utilities
{
  /// <summary>
  /// A utility class which applies XPath expressions to xml files and returns the value
  /// in a variety of data types
  /// </summary>
  public class XPathValidator
  {
    /// <summary>
    /// basic constructor
    /// </summary>
    public XPathValidator()
    {
      //
      // TODO: Add constructor logic here
      //
    }
    /// <summary>
    /// Evaluates the XPath expression and returns a string value
    /// </summary>
    /// <param name="InputXmlFile">full path of the xml file to parse</param>
    /// <param name="XPathString">XPath expression to apply</param>
    /// <returns>string</returns>
    public string GetStringValue(string InputXmlFile,string XPathString)
    {
      string retval ;
      object obj = MakeXPathExpression(InputXmlFile,XPathString);
      retval = (string)obj;
      return(retval);
    }

    /// <summary>
    /// Evaluates the XPath expression and returns a integer value
    /// </summary>
    /// <param name="InputXmlFile">full path of the xml file to parse</param>
    /// <param name="XPathString">XPath expression to apply</param>
    /// <returns>int</returns>
    public int GetIntegerValue(string InputXmlFile,string XPathString)
    {
      int retval ;
      object obj = MakeXPathExpression(InputXmlFile,XPathString);
      retval = System.Convert.ToInt32(obj);
      return(retval);
    }

    /// <summary>
    /// Evaluates the XPath expression and returns a bool value
    /// </summary>
    /// <param name="InputXmlFile">full path of the xml file to parse</param>
    /// <param name="XPathString">XPath expression to apply</param>
    /// <returns>bool</returns>
    public bool GetBooleanValue(string InputXmlFile,string XPathString)
    {
      bool retval ;
      object obj = MakeXPathExpression(InputXmlFile,XPathString);
      retval = System.Convert.ToBoolean(obj);
      return(retval);
    }
    private object MakeXPathExpression(string inputXmlFile,string XPathString)
    {
      
      XmlDocument xDoc = new XmlDocument();
      xDoc.Load(inputXmlFile);
      XPathNavigator nav = xDoc.CreateNavigator();
      XPathExpression expr = nav.Compile( XPathString);

      return(nav.Evaluate(expr));
    }
  }
}