Filters the collection of elements by XML attribute. - CSharp System.Xml

CSharp examples for System.Xml:XML Element

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Description

Filters the collection of elements by XML attribute.

Demo Code


using System.Xml.Linq;
using System.Linq;
using System.Collections.Generic;

public class Main{
        /// <summary>
        /// Filters the collection of elements by attribute.
        /// </summary>
        /// <param name="elements">The elements to filter.</param>
        /// <param name="attributeName">Name of the attribute.</param>
        /// <param name="value">The value.</param>
        /// <returns>A filtered list of elements containing the given attribute with the given value.</returns>
        public static List<XElement> FilterByAttribute(this IEnumerable<XElement> elements,
                                                       string attributeName, string value)
        {//  w w w  .  ja v a  2 s. co  m
            return FilterByAttribute(elements, (XName)attributeName, value);
        }
        /// <summary>
        /// Filters the collection of elements by attribute.
        /// </summary>
        /// <param name="elements">The elements to filter.</param>
        /// <param name="attributeName">Name of the attribute.</param>
        /// <param name="value">The value.</param>
        /// <returns>A filtered list of elements containing the given attribute with the given value.</returns>
        public static List<XElement> FilterByAttribute(this IEnumerable<XElement> elements,
                                                       XName attributeName, string value)
        {
            List<XElement> filteredElements = new List<XElement>();

            foreach (XElement currentElement in elements)
            {
                XAttribute targetAttribute = currentElement.Attribute(attributeName);

                if (targetAttribute != null && targetAttribute.Value == value)
                {
                    filteredElements.Add(currentElement);
                }
            }

            return filteredElements;
        }
        /// <summary>
        /// Filters the collection of elements by attribute.
        /// </summary>
        /// <param name="elements">The elements to filter.</param>
        /// <param name="attributeName">Name of the attribute.</param>
        /// <returns>A filtered list of elements containing the given attribute.</returns>
        public static List<XElement> FilterByAttribute(this IEnumerable<XElement> elements,
                                                       string attributeName)
        {
            List<XElement> filteredElements = new List<XElement>();

            foreach (XElement currentElement in elements)
            {
                XAttribute targetAttribute = currentElement.Attribute(attributeName);

                if (targetAttribute != null)
                {
                    filteredElements.Add(currentElement);
                }
            }

            return filteredElements;
        }
}

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