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

CSharp examples for System.Collections:ICollection

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Description

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

Demo Code

/*/*  ww w  .  j ava2s .  c om*/
 * 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;
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(ICollection targetCollection, ICollection sourceCollection)
        {
            if (targetCollection == null)
            {
                throw new ArgumentNullException("targetCollection", "Collection cannot be null.");
            }
            if (sourceCollection == null)
            {
                throw new ArgumentNullException("sourceCollection", "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() == true)
                {
                    if ((contains = (bool)method.Invoke(targetCollection, new Object[] { sourceCollectionEnumerator.Current })) == false)
                        break;
                }
            }
            return contains;
        }
}

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