将一个字符串倒序

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

namespace paixu
{
    class Program
    {
        public static StringBuilder Get(string str)
        {
            char[] dd = str.ToCharArray();
           IEnumerable<char> aa = dd.Reverse();
            StringBuilder sb = new StringBuilder();
            foreach (char i in aa)
            {
                sb.Append(i);
            }
            return sb;
        }

        static void Main(string[] args)
        {
            string str = "abc";
            Console.Write(Get(str));
            Console.ReadLine();

 

         //或者第二种方法

            string str = "fsjfjskfjs";
            StringBuilder sb = new StringBuilder();
            for (int i = str.Length-1; i >=0; i——)
            {
                sb.Append(str[i]);
            }
            Console.WriteLine(sb.ToString());
            Console.ReadLine();
        }
    }
}