Determines whether the collection contains all the elements in the specified ICollection. - CSharp System.Collections

CSharp examples for System.Collections:ICollection

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Description

Determines whether the collection contains all the elements in the specified ICollection.

Demo Code

/*//ww  w .j  a  v  a2s .c o m
 * Copyright ? 2002-2011 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
using System.Reflection;
using System.Collections.Generic;
using System.Collections;
using System;

public class Main{
        /// <summary>
      /// Determines whether the collection contains all the elements in the specified collection.
      /// </summary>
      /// <param name="targetCollection">The collection to check.</param>
      /// <param name="sourceCollection">Collection whose elements would be checked for containment.</param>
      /// <returns>true if the target collection contains all the elements of the specified collection.</returns>
      public static bool ContainsAll<T>(ICollection<T> targetCollection, ICollection<T> sourceCollection)
      {
         if (targetCollection == null || sourceCollection == null)
         {
            throw new ArgumentNullException("Collection cannot be null.");
         }
         if ( sourceCollection.Count == 0 && targetCollection.Count > 1 )
            return true;

         IEnumerator sourceCollectionEnumerator = sourceCollection.GetEnumerator();

         bool contains = false;

         MethodInfo method;
         method = targetCollection.GetType().GetMethod("containsAll", BindingFlags.IgnoreCase | BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public);

         if (method != null)
            contains = (bool) method.Invoke(targetCollection, new Object[] {sourceCollection});
         else
         {
            method = targetCollection.GetType().GetMethod("Contains", BindingFlags.IgnoreCase | BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public);
            if (method == null)
            {
               throw new InvalidOperationException("Target collection does not implment a Contains() or ContainsAll() method.");
            }
            while (sourceCollectionEnumerator.MoveNext())
            {
               if ((contains = (bool) method.Invoke(targetCollection, new Object[] {sourceCollectionEnumerator.Current})) == false)
                  break;
            }
         }
         return contains;
      }
}

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