Inserts an item into the collection at an index. - CSharp System.Collections.Generic

CSharp examples for System.Collections.Generic:ICollection

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Description

Inserts an item into the collection at an index.

Demo Code

// (c) Copyright Microsoft Corporation.
using System.Reflection;
using System.Linq;
using System.Diagnostics.CodeAnalysis;
using System.ComponentModel;
using System.Collections;
using System;/*from w  w w  . j  a  va  2  s  .  c om*/

public class Main{
        /// <summary>
        /// Inserts an item into the collection at an index.
        /// </summary>
        /// <param name="collection">The collection.</param>
        /// <param name="index">The index at which to insert the item.</param> 
        /// <param name="item">The item to be inserted.</param>
        public static void Insert(this IEnumerable collection, int index, object item)
        {
            ICollectionView collectionView = collection as ICollectionView;
            if (collectionView != null)
            {
                Insert(collectionView.SourceCollection, index, item);
            }
            else
            {
                Type genericListType = collection.GetType().GetInterfaces().Where(interfaceType => interfaceType.FullName.StartsWith("System.Collections.Generic.IList`1", StringComparison.Ordinal)).FirstOrDefault();
                if (genericListType != null)
                {
                    genericListType.GetMethod("Insert").Invoke(collection, new object[] { index, item });
                }
                else
                {
                    IList list = collection as IList;
                    list.Insert(index, item);
                }
            }
        }
}

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