Copies the specified array, truncating or padding with nulls (if necessary) so the copy has the specified length. - CSharp System

CSharp examples for System:Array Null Element

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Description

Copies the specified array, truncating or padding with nulls (if necessary) so the copy has the specified length.

Demo Code


using System.Text;
using System.Runtime.InteropServices;
using System.Reflection.Emit;
using System.Reflection;
using System.Linq;
using System.Globalization;
using System.Collections.Generic;
using System.Collections;
using System;/*from w ww .ja v  a 2s. co  m*/

public class Main{
        /// <summary>
        /// Copies the specified array, truncating or padding with nulls (if necessary) so the copy has the specified length.
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="array"></param>
        /// <param name="newLength"></param>
        /// <returns></returns>
        public static T[] CopyOf<T>(T[] array, int newLength)
        {
            T[] newArray = new T[newLength];
            if (newArray.Length >= array.Length)
            {
                if (typeof(T) == typeof(string))
                {
                    // append with null or 0
                    for (int i = 0; i < array.Length; i++)
                    {
                        newArray[i] = array[i];
                    }
                }
                else
                {
                    Buffer.BlockCopy(array, 0, newArray, 0, array.Length * Marshal.SizeOf<T>());
                }
                return newArray;
            }

            // shrinking of the array
            if (newArray.Length < array.Length)
            {
                if (typeof(T) == typeof(string))
                {
                    for (int i = 0; i < newArray.Length; i++)
                    {
                        newArray[i] = array[i];
                    }
                }
                else
                {
                    Buffer.BlockCopy(array, 0, newArray, 0, newArray.Length * Marshal.SizeOf<T>());
                }
                return newArray;
            }
            throw new NotImplementedException();
        }
}

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