一步一步去掉这一类switch Case

Get_MCODE_Desc public static string Get_MCODE_Desc(string MCODE)
        {
            switch (MCODE)
            {
                case "101000":
                    return "链路检测（Network Management）";

                case "101001":
                    return "业务前置机签到交易（Sign On）";

                case "101002":
                    return "业务前置机签退交易（Sign Off）";

                case "101010":
                    return "订购关系查询（Order Relationship Query）";

                case "101071":
                    return "子应用状态查询（Sub_Application status Query）";

                case "101011":
                    return "发卡请求（空中、写卡器）（Create Sub Application Request）";

                case "101012":
                    return "卡片操作结果通知（写卡器）（Terminal Card Operation Result）";

                case "101021":
                    return "业务前置机挂失通知（Prehost Report Of Loss）";

                case "101022":
                    return "解挂通知（Cancel Report Of Loss）";

                case "101031":
                    return "注销请求（空中、写卡器）（Cancellation Request）";

                case "101032":
                    return "废卡请求（Annul Card Request）";

                case "101041":
                    return "个人化信息更新请求（空中）（Update Sub_Application）";

                case "101051":
                    return "恢复企业初始主控密钥（Reload Keys）";

                case "101061":
                    return "信息服务通知（Message Send）";

                case "101062":
                    return "信息状态查询（Message Status Query）";

                case "101081":
                    return "机具状态数据上报（Terminal Status）";

                case "101091":
                    return "卡片操作请求（Card Operation Request）";

                case "102011":
                    return "空中卡片操作结果通知（Air Card Operation Result）";

                case "102021":
                    return "一卡通业务前置机应用停止通知（Prehost Application Stop）";

                case "102031":
                    return "信息查询请求（Message Query Request）";

                case "102041":
                    return "服务系统挂失通知（ServiceSystem Report Of Loss）";

                case "108001":
                    return "企业客户端查询前置状态（Query PreHost Status）";
            }
            return "未知交易码";
        }
    }

再来去掉的方法：

StrCodeDescription        /// <summary>
        /// 
        /// </summary>
        /// <param name="iCode">传入业务代码</param>
        /// <returns>返回业务描述</returns>
        public static string StrCodeDescription(int iCode)
        {
            string strResult;
            Dictionary<int, String>  mCodeDescription= new Dictionary<int, string>
                                                           {
                                                               {101000, "链路检测（Network Management）"},
                                                               {101001, "业务前置机签到交易（Sign On）"},
                                                               {101002, "业务前置机签退交易（Sign Off）"},
                                                               {101010, "订购关系查询（Order Relationship Query）"},
                                                               {101011, "发卡请求（空中、写卡器）（Create Sub Application Request）"},
                                                               {101012, "卡片操作结果通知（写卡器）（Terminal Card Operation Result）"},
                                                               {101021, "业务前置机挂失通知（Prehost Report Of Loss）"},
                                                               {101022, "解挂通知（Cancel Report Of Loss）"},
                                                               {101031, "注销请求（空中、写卡器）（Cancellation Request）"},
                                                               {101032, "废卡请求（Annul Card Request）"},
                                                               {101041, "个人化信息更新请求（空中）（Update Sub_Application）"},
                                                               {101051, "恢复企业初始主控密钥（Reload Keys）"},
                                                               {101061, "信息服务通知（Message Send）"},
                                                               {101062, "信息状态查询（Message Status Query）"},
                                                               {101071, "子应用状态查询（Sub_Application status Query）"},
                                                               {101081, "机具状态数据上报（Terminal Status）"},
                                                               {101091, "卡片操作请求（Card Operation Request）"},
                                                               {102011, "空中卡片操作结果通知（Air Card Operation Result）"},
                                                               {102021, "一卡通业务前置机应用停止通知（Prehost Application Stop）"},
                                                               {102031, "信息查询请求（Message Query Request）"},
                                                               {102041, "服务系统挂失通知（ServiceSystem Report Of Loss）"},
                                                               {108001, "企业客户端查询前置状态（Query PreHost Status）"}
                                                           };
                       
            strResult = "未知交易码";

            foreach (var item in mCodeDescription)
            {
                //int iSearch = Search(item., 0, 21, 11);
                if(item.Key == iCode)
                {
                    strResult = item.Value;
                }
            }

            return strResult;
        }

我们来测试一下运行情况

代码 Using Xunit;//用的Resharp 的Xunit插件

    public class Test01
    {
        [Fact]
        public void Test()
        {
            Stopwatch timer = new Stopwatch();
            decimal micro;

            timer.Start();
            string str = MCodeDesc.Get_MCODE_Desc("101021");
            Console.WriteLine(str);
            timer.Stop();

            micro = timer.Elapsed.Ticks / 10m;
            Console.WriteLine("Execution time was {0:F1} microseconds.", micro);

            timer = Stopwatch.StartNew();

            timer.Start();
            Console.WriteLine(MCodeDesc.StrCodeDescription(101021));
            timer.Stop();

            micro = timer.Elapsed.Ticks / 10m;
            Console.WriteLine("Execution time was {0:F1} microseconds.", micro);

            timer = Stopwatch.StartNew();

            timer.Start();
            Console.WriteLine(MCodeDesc.StrCodeDescription(101025));
            timer.Stop();

            micro = timer.Elapsed.Ticks / 10m;
            Console.WriteLine("Execution time was {0:F1} microseconds.", micro);
        }
    }

测试结果：

Test01.Test : Passed

还能优化吗？

StrCodeDescription
        /// <summary>
        /// 
        /// </summary>
        /// <param name="iCode">传入业务代码</param>
        /// <returns>返回业务描述</returns>
        public static string StrCodeDescription(int iCode)
        {
            string strResult;
            Dictionary<int, String>  mCodeDescription= new Dictionary<int, string>
                                                           {
                                                               {101000, "链路检测（Network Management）"},
                                                               {101001, "业务前置机签到交易（Sign On）"},
                                                               {101002, "业务前置机签退交易（Sign Off）"},
                                                               {101010, "订购关系查询（Order Relationship Query）"},
                                                               {101011, "发卡请求（空中、写卡器）（Create Sub Application Request）"},
                                                               {101012, "卡片操作结果通知（写卡器）（Terminal Card Operation Result）"},
                                                               {101021, "业务前置机挂失通知（Prehost Report Of Loss）"},
                                                               {101022, "解挂通知（Cancel Report Of Loss）"},
                                                               {101031, "注销请求（空中、写卡器）（Cancellation Request）"},
                                                               {101032, "废卡请求（Annul Card Request）"},
                                                               {101041, "个人化信息更新请求（空中）（Update Sub_Application）"},
                                                               {101051, "恢复企业初始主控密钥（Reload Keys）"},
                                                               {101061, "信息服务通知（Message Send）"},
                                                               {101062, "信息状态查询（Message Status Query）"},
                                                               {101071, "子应用状态查询（Sub_Application status Query）"},
                                                               {101081, "机具状态数据上报（Terminal Status）"},
                                                               {101091, "卡片操作请求（Card Operation Request）"},
                                                               {102011, "空中卡片操作结果通知（Air Card Operation Result）"},
                                                               {102021, "一卡通业务前置机应用停止通知（Prehost Application Stop）"},
                                                               {102031, "信息查询请求（Message Query Request）"},
                                                               {102041, "服务系统挂失通知（ServiceSystem Report Of Loss）"},
                                                               {108001, "企业客户端查询前置状态（Query PreHost Status）"}
                                                           };

//就在这里优化吧
            if (!mCodeDescription.TryGetValue(iCode, out strResult))
            {
                strResult = "未知交易码";
            }

            return strResult;
        }

再看看运行结果

业务前置机挂失通知（Prehost Report Of Loss）
Execution time was 3313.1 microseconds.
业务前置机挂失通知（Prehost Report Of Loss）
Execution time was 2776.1 microseconds.
未知交易码
Execution time was 4.2 microseconds.