找出与原始数据中没有的数据的算法

用c# 呵nunit 做开发呵测试工具

using system;
using system.collections;
using nunit.framework;

namespace cn.lovetyping.unittest
{
 /// <summary>
 /// sort 的摘要说明。
 /// </summary>
 ///
 [testfixture]
 public class sort
 {
  /// <summary>
  /// the orignal data which is used to compare with the new
  ///  data.if there is some data exist in the newdata but not in orignal data.
  ///  add it to the result.
  /// </summary>
  /// input:
  /// <param name="orignal"></param>
  /// <param name="newdata"></param>
  /// output
  /// <returns>arraylist</returns>
  public arraylist sortdata(string[] orignal,string[] newdata)
  {
   arraylist result = new arraylist();

   int oindex=0,nindex=0;
   //according to the condition
            while(oindex<orignal.length && nindex<newdata.length)
            {
             if(newdata[nindex].compareto(orignal[oindex]) <0)
             {
     result.add(newdata[nindex]);
     nindex++;
             }
    else if(newdata[nindex].compareto(orignal[oindex]) ==0)
    {
     oindex++;nindex++;
    }
    else if(newdata[nindex].compareto(orignal[oindex]) > 0)
    {
     oindex++;
     continue;
    }
            }
   //if the
   if(nindex == newdata.length || oindex< orignal.length)
   {
    return result;
   }
   else if( nindex < newdata.length)
   {
    
    while(nindex< newdata.length)
    {
     result.add(newdata[nindex++]);
    }
   }
   return result;
  }

  [test]
  public void testsort()
  {
   string[] code1 = new string[]{"0","4","6","9"};
   string[] code2 = new string[]{"1","3","6","7","9","12"};

   arraylist result = this.sortdata(code1,code2);
   assert.istrue(result.count == 4);
   for(int i=0;i<result.count;i++)
   {
    console.writeline(result[i]);
   }

   console.writeline("---------------another data------------");
   code1 = new string[]{"0","4","6","9"};
   code2 = new string[]{"1","3","6"};
   result = this.sortdata(code1,code2);
   assert.istrue(result.count == 2);
   for(int i=0;i<result.count;i++)
   {
    console.writeline(result[i]);
   }

   console.writeline("---------------another data------------");
   code1 = new string[]{"0","4","6","9"};
   code2 = new string[]{"1","3","7"};
   result = this.sortdata(code1,code2);
   assert.istrue(result.count == 3);
   for(int i=0;i<result.count;i++)
   {
    console.writeline(result[i]);
   }

   console.writeline("---------------another data------------");
   code1 = new string[]{"0","11","13","3","3","9"};
   code2 = new string[]{"1","11","15","16","19","3","7"};
   result = this.sortdata(code1,code2);
   assert.istrue(result.count == 5);
   for(int i=0;i<result.count;i++)
   {
    console.writeline(result[i]);
   }
  }
 }
}