Creates a new array with just the specified elements. : Array Util « Collections Data Structure « C# / C Sharp

1. C# / C Sharp
2. Collections Data Structure
3. Array Util

Creates a new array with just the specified elements.

  
//Microsoft Public License (Ms-PL)
//http://visualizer.codeplex.com/license

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Redwerb.BizArk.Core.ArrayExt
{
    /// <summary>
    /// Provides extension methods for string arrays.
    /// </summary>
    public static class ArrayExt
    {

        #region Shrink

        /// <summary>
        /// Creates a new array with just the specified elements.
        /// </summary>
        /// <param name="arr"></param>
        /// <param name="startIndex"></param>
        /// <param name="endIndex"></param>
        /// <returns></returns>
        public static Array Shrink(this Array arr, int startIndex, int endIndex)
        {
            if (arr == null) return null;
            if (startIndex >= arr.Length) return Array.CreateInstance(arr.GetType().GetElementType(), 0);
            if (endIndex < startIndex) return Array.CreateInstance(arr.GetType().GetElementType(), 0);
            if (startIndex < 0) startIndex = 0;

            int length = (endIndex - startIndex) + 1;
            Array retArr = Array.CreateInstance(arr.GetType().GetElementType(), length);
            for (int i = startIndex; i <= endIndex; i++)
                retArr.SetValue(arr.GetValue(i), i - startIndex);

            return retArr;
        }

        /// <summary>
        /// Creates a new array with just the specified elements.
        /// </summary>
        /// <param name="arr"></param>
        /// <param name="startIndex"></param>
        /// <returns></returns>
        public static string[] Shrink(this string[] arr, int startIndex)
        {
            return Shrink((Array)arr, startIndex, arr.Length - 1) as string[];
        }

        /// <summary>
        /// Creates a new array with just the specified elements.
        /// </summary>
        /// <param name="arr"></param>
        /// <param name="startIndex"></param>
        /// <param name="endIndex"></param>
        /// <returns></returns>
        public static string[] Shrink(this string[] arr, int startIndex, int endIndex)
        {
            return Shrink((Array)arr, startIndex, endIndex) as string[];
        }

        /// <summary>
        /// Creates a new array with just the specified elements.
        /// </summary>
        /// <param name="arr"></param>
        /// <param name="startIndex"></param>
        /// <returns></returns>
        public static int[] Shrink(this int[] arr, int startIndex)
        {
            return Shrink((Array)arr, startIndex, arr.Length - 1) as int[];
        }

        /// <summary>
        /// Creates a new array with just the specified elements.
        /// </summary>
        /// <param name="arr"></param>
        /// <param name="startIndex"></param>
        /// <param name="endIndex"></param>
        /// <returns></returns>
        public static int[] Shrink(this int[] arr, int startIndex, int endIndex)
        {
            return Shrink((Array)arr, startIndex, endIndex) as int[];
        }

        #endregion
   }
}

   
    
  

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