Lire une valeur Booléen sinon retourne une exception

/*
 Microsoft Public License (Ms-PL)
 http://dbmlmanager.codeplex.com/license
 */
#region using
using System;
using System.Xml;
#endregion
 
namespace DbmlManager.Lib.Utility
{
  #region Class Docs
  ///
<summary>
  /// Summary description for XmlUtil.
  /// </summary>
 
  #endregion
 
  public class XmlUtil
  {
    public static string GetAttrib(XmlNode noeud, string attrib, string valDefaut)
    {
      XmlAttribute xmlAttrib = noeud.Attributes[attrib];
      if (xmlAttrib == null)
        return valDefaut;
 
      string val = xmlAttrib.Value;
      return (val == null) ? valDefaut : val;
    }
    #region GetBoolAttribOrThrow(XmlNode noeud, string attrib)
    public static bool GetBoolAttribOrThrow(XmlNode noeud, string attrib)
    {
      string val = GetAttrib(noeud, attrib, null);
      if (val == null)
        throw new Exception(String.Format("Attribute '{0}' not specified in noeud '{1}'", attrib, noeud.Name));
 
      if (val == null || val == string.Empty)
        return false;
 
      bool returnVal = (val == "1" || val.ToLower() == "true");
 
      return returnVal;
    }
    #endregion
  }
}