比较字符串大小

using System;

public class MyClass
{
    public static void Main()
    {
        string s1 = "abcd";
        string s2 = "abcde";
        string ss = null;
        char[] arr1 = s1.ToCharArray();
        char[] arr2 = s2.ToCharArray();
        int length = arr1.Length<=arr2.Length?arr1.Length:arr2.Length;
        for (int i=0; i<length; i++)
        {
            if (arr1[i] < arr2[i])
            {
                ss = s2; 
                break;
            }
            else if (arr1[i] > arr2[i])
            {
                ss = s1;
                break;
            }
            // 相等继续循环
            else if (i == length-1 && arr1.Length >= arr2.Length) // 循环到最后
            {
                ss = s1; 
            }
            else if (i == length-1) // 循环到最后
            {
                ss = s2;
            }
        }
        Console.WriteLine(ss);
        Console.ReadLine();    
    }
}

把字符串转化为char数组，再对char数组进行比较，根据字符串的长度，进行判断。。