Determines whether the collection contains the specified element : IEnumerable « Collections Data Structure « C# / C Sharp






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

Determines whether the collection contains the specified element

    

/*
 * Copyright  2002-2005 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;
using System.Collections;
using System.Collections.Generic;
using System.Reflection;

namespace Spring.Util.Generic
{
  /// <summary>
  /// Miscellaneous generic collection utility methods.
  /// </summary>
  /// <remarks>
  /// Mainly for internal use within the framework.
  /// </remarks>
  /// <author>Mark Pollack (.NET)</author>
  public sealed class CollectionUtils
  {
    /// <summary>
    /// Determines whether the <paramref name="collection"/> contains the specified <paramref name="element"/>.
    /// </summary>
    /// <param name="collection">The collection to check.</param>
    /// <param name="element">The object to locate in the collection.</param>
    /// <returns><see lang="true"/> if the element is in the collection, <see lang="false"/> otherwise.</returns>
    public static bool Contains<T>(ICollection<T> collection, Object element)
    {
      if (collection == null)
      {
        throw new ArgumentNullException("Collection cannot be null.");
      }
      MethodInfo method;
      method = collection.GetType().GetMethod("contains", BindingFlags.IgnoreCase | BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public);
      if (null == method)
      {
        throw new InvalidOperationException("Collection type " + collection.GetType() + " does not implement a Contains() method.");
      }
      return (bool) method.Invoke(collection, new Object[] {element});
    }
   }
}








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