Retains the elements in the target collection that are contained in the specified collection : ICollection « Collections Data Structure « C# / C Sharp

1. C# / C Sharp
2. Collections Data Structure
3. ICollection

Retains the elements in the target collection that are contained in the specified collection

  

#region License and Copyright
/*
 * Dotnet Commons Collections 
 * 
 *
 * This library is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by 
 * the Free Software Foundation; either version 2.1 of the License, or 
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License 
 * for more details. 
 *
 * You should have received a copy of the GNU Lesser General Public License 
 * along with this library; if not, write to the 
 * Free Software Foundation, Inc., 
 * 59 Temple Place, 
 * Suite 330, 
 * Boston, 
 * MA 02111-1307 
 * USA 
 * 
 */
#endregion

using System;
using System.Collections;

namespace Dotnet.Commons.Lang {
    class MainClass{

        /// <summary>
        /// Retains the elements in the target collection that are contained in the specified collection
        /// </summary>
        /// <param name="target">Collection where the elements will be removed.</param>
        /// <param name="c">Elements to be retained in the target collection.</param>
        /// <returns>true</returns>
        public static bool RetainAll(System.Collections.ICollection target, System.Collections.ICollection c)
        {
            System.Collections.IEnumerator e = new System.Collections.ArrayList(target).GetEnumerator();
            System.Collections.ArrayList al = new System.Collections.ArrayList(c);

            //Reflection. Invoke "retainAll" method for proprietary classes or "Remove" for each element in the collection
            System.Reflection.MethodInfo method;
            try
            {
                method = c.GetType().GetMethod("retainAll");

                if (method != null)
                    method.Invoke(target, new System.Object[] { c });
                else
                {
                    method = c.GetType().GetMethod("Remove");

                    while (e.MoveNext() == true)
                    {
                        if (al.Contains(e.Current) == false)
                            method.Invoke(target, new System.Object[] { e.Current });
                    }
                }
            }
            catch (System.Exception ex)
            {
                throw ex;
            }

            return true;
        }
   }
}

   
    
  

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