Creates and returns the attribute with the given name in the location specified by the given location string in the given XML element. - CSharp System.Xml

CSharp examples for System.Xml:XML Element

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Description

Creates and returns the attribute with the given name in the location specified by the given location string in the given XML element.

Demo Code


using System.Linq;
using System.Text;
using System.Collections.Generic;
using System.Globalization;
using System.Xml.Linq;
using System;/*from   w  w w.  j a v a 2s . co  m*/

public class Main{
        /// <summary>
        /// Creates and returns the attribute with the given name in the location 
        /// specified by the given location string in the given XML element.
        /// </summary>
        /// <param name="baseElement">The XML element.</param>
        /// <param name="location">The location string.</param>
        /// <param name="attrName">Name of the attribute.</param>
        /// <param name="attrValue">The value to be assigned to the attribute.</param>
        /// <returns>returns the attribute with the given name in the location 
        /// specified by the given location string in the given XML element.</returns>
        public static XAttribute CreateAttribute(XElement baseElement, string location, XName attrName, object attrValue, XNamespace documentDefaultNamespace)
        {
            XElement newLoc = FindLocation(baseElement, location);
            if (newLoc == null)
            {
                if (CanCreateLocation(baseElement, location))
                {
                    newLoc = CreateLocation(baseElement, location);
                }
                else
                {
                    return null;
                }
            }

            // check if the attribute does not exist
            if (attrName.Namespace.IsEmpty() && attrName.Namespace != documentDefaultNamespace)
            {
                // i.e., the attribute already exists 
                if (newLoc.Attribute(attrName) != null)
                    return null; // we cannot create another one with the same name
            }
            else
            {
                if (newLoc.Attribute_NamespaceNeutral(attrName) != null) // i.e., the attribute already exists
                    return null; // we cannot create another one with the same name
            }

            return newLoc.AddAttributeNamespaceSafe(attrName, attrValue, documentDefaultNamespace);
        }
        public static XAttribute Attribute_NamespaceNeutral(this XElement parent, XName name)
        {
            return parent.Attributes().FirstOrDefault(e => e.Name.LocalName == name.LocalName);
        }
        public static bool IsEmpty(this XNamespace self)
        {
            return self != null && !String.IsNullOrEmpty(self.NamespaceName.Trim());
        }
        public static XAttribute AddAttributeNamespaceSafe(this XElement parent, XName attrName, object attrValue, XNamespace documentDefaultNamespace)
        {
            var newAttrName = attrName;

            if (newAttrName.Namespace == documentDefaultNamespace)
                    newAttrName = newAttrName.RemoveNamespace();

            var newAttr = new XAttribute(newAttrName, attrValue.ToXmlValue());
            parent.Add(newAttr);
            return newAttr;
        }
}

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