Gets the value of an attribute from XML - CSharp System.Xml

CSharp examples for System.Xml:XML Attribute

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Description

Gets the value of an attribute from XML

Demo Code


using System.Xml.Linq;
using System;//from   ww w . j a  v  a2  s .c om

public class Main{
        /// <summary>
      /// Gets the value of an attribute
      /// </summary>
      /// <param name="xEl">Extends this XElement Type</param>
      /// <param name="attName">An XName that contains the name of the attribute to retrieve.</param>
      /// <returns>Attribute value or default of T if element doesn't exist</returns>
      public static T GetAttributeValue<T>(this XElement xEl, XName attName)
      {
         return xEl.GetAttributeValue<T>(attName, default(T));
      }
        /// <summary>
      /// Gets the value of an attribute
      /// </summary>
      /// <param name="xEl">Extends this XElement Type</param>
      /// <param name="attName">An XName that contains the name of the attribute to retrieve.</param>
      /// <param name="defaultReturn">Default return if the attribute doesn't exist</param>
      /// <returns>Attribute value or default if attribute doesn't exist</returns>
      public static T GetAttributeValue<T>(this XElement xEl, XName attName, T defaultReturn)
      {
         string returnValue = xEl.GetAttributeValue(attName, String.Empty);
         if (returnValue == String.Empty) return defaultReturn;
         return (T)Convert.ChangeType(returnValue, typeof(T));
      }
        /// <summary>
      /// Gets the value of an attribute
      /// </summary>
      /// <param name="xEl">Extends this XElement Type</param>
      /// <param name="attName">An XName that contains the name of the attribute to retrieve.</param>
      /// <returns>Attribute value or String.Empty if element doesn't exist</returns>
      public static string GetAttributeValue(this XElement xEl, XName attName)
      {
         return xEl.GetAttributeValue(attName, String.Empty);
      }
        #region GetAttributeValue
      /// <summary>
      /// Gets the value of an attribute
      /// </summary>
      /// <param name="xEl">Extends this XElement Type</param>
      /// <param name="attName">An XName that contains the name of the attribute to retrieve.</param>
      /// <param name="defaultReturn">Default return if the attribute doesn't exist</param>
      /// <returns>Attribute value or default if attribute doesn't exist</returns>
      public static string GetAttributeValue(this XElement xEl, XName attName, string defaultReturn)
      {
         XAttribute att = xEl.Attribute(attName);
         if (att == null) return defaultReturn;
         return att.Value;
      }
}

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