编译器处理whilefor结构的小发现

1、编译器处理while，for结构的小发现在做一个日报自动报表发送项目时，因为项目是Windows服务，而且报表是每天自动发送，所以里面有这么一个函数public void AutoReportSend()while(true)try/采集时间没到，则结束。直到采集时间才开始采集作业if(DateTime.Now SystemConfiguration.GetInstance().GatherTime)Thread.Sleep(TimeSpan)(SystemConfiguration.GetInstance().GatherTime-DateTime.Now)；log.Info(邮件发送开始！

2、)；ReportDataProcess model=new ReportDataProcess()；model.GenerateReport()；EmailUtil emailUtil=new EmailUtil()；string .ToString()；string .ToString()；emailUtil.IsBodyHtml=true；emailUtil.EmailTitle=DateTime.Now.ToString(yyyy)+年+DateTime.Now.Month.ToString()+月+DateTime.Now.Day.ToString()+日+ConfigurationS

3、ettings.AppSettingsEmailTitle.ToString()；emailUtil.EmSubject=ConfigurationSettings.AppSettingsEmSubject.ToString()；emailUtil.SendEmilPerson=ConfigurationSettings.AppSettingsSendEmil.ToString()；emailUtil.ToEmail=ConfigurationSettings.AppSettingsToEmail.ToString()；emailUtil.FromEmail=ConfigurationSett

4、ings.AppSettingsSendEmil.ToString()；emailUtil.SendEmailAcount=ConfigurationSettings.AppSettingsSendEmailAcount.ToString()；emailUtil.SendEmailPsd=ConfigurationSettings.AppSettingsSendEmialPswd.ToString()；emailUtil.SetEmailAttactment()；emailUtil.SmtpHost=ConfigurationSettings.AppSettingsSmtpHost.ToStr

5、ing()；emailUtil.SmtpServePort=ConfigurationSettings.AppSettingsSmtpServePort.ToString()；emailUtil.EmailContent=ConfigurationSettings.AppSettingsEmailContent.ToString()；emailUtil.SendEmail()；log.Info(邮件发送成功！)；DateTime dtNow=DateTime.Now；DateTime dtNext=Convert.ToDateTime(DateTime.Now.ToString(yyyy-MM

6、-dd)+SystemConfiguration.GetInstance().GatherHour+：+SystemConfiguration.GetInstance().GatherMinute)；Thread.Sleep(TimeSpan)(dtNext.AddDays(1)-dtNow)；catch(Exception exc)log.Error(exc.ToString()；/发送报错短信SendMessage.MessageSending(函数AutoReportSend出错，具体情况请检查日志)；Thread.Sleep(600000)；偶然情况下让我发现了一个让我觉得比较有趣的问

7、题：我用.NET Reflector工具查看项目的exe文件时候，发现里面的这段代码变成了下面的样子代码publicvoid AutoReportSend()Label_0000：tryif(DateTime.Now SystemConfiguration.GetInstance().GatherTime)Thread.Sleep(TimeSpan)(SystemConfiguration.GetInstance().GatherTime-DateTime.Now)；log.Info(邮件发送开始！)；new ReportDataProcess().GenerateReport()；Email

8、Util emailUtil=new EmailUtil()；string .ToString()；string .ToString()；emailUtil.set_IsBodyHtml(true)；emailUtil.set_EmailTitle(DateTime.Now.ToString(yyyy)+年+DateTime.Now.Month.ToString()+月+DateTime.Now.Day.ToString()+日+ConfigurationSettings.AppSettingsEmailTitle.ToString()；emailUtil.set_EmSubject(Conf

9、igurationSettings.AppSettingsEmSubject.ToString()；emailUtil.set_SendEmilPerson(ConfigurationSettings.AppSettingsSendEmil.ToString()；emailUtil.set_ToEmail(ConfigurationSettings.AppSettingsToEmail.ToString()；emailUtil.set_FromEmail(ConfigurationSettings.AppSettingsSendEmil.ToString()；emailUtil.set_Sen

10、dEmailAcount(ConfigurationSettings.AppSettingsSendEmailAcount.ToString()；emailUtil.set_SendEmailPsd(ConfigurationSettings.AppSettingsSendEmialPswd.ToString()；emailUtil.SetEmailAttactment()；emailUtil.set_SmtpHost(ConfigurationSettings.AppSettingsSmtpHost.ToString()；emailUtil.set_SmtpServePort(Configu

11、rationSettings.AppSettingsSmtpServePort.ToString()；emailUtil.set_EmailContent(ConfigurationSettings.AppSettingsEmailContent.ToString()；emailUtil.SendEmail()；log.Info(邮件发送成功！)；DateTime dtNow=DateTime.Now；Thread.Sleep(TimeSpan)(Convert.ToDateTime(DateTime.Now.ToString(yyyy-MM-dd)+SystemConfiguration.G

12、etInstance().GatherHour+：+SystemConfiguration.GetInstance().GatherMinute).AddDays(1.0)-dtNow)；goto Label_0000；catch(Exception exc)log.Error(exc.ToString()；SendMessage.MessageSending(函数AutoReportSend出错，具体情况请检查日志)；Thread.Sleep(0x927c0)；goto Label_0000；反编译的IL代码如下：代码1.methodpublic hidebysig instancevoid

13、 AutoReportSend()cil managed 23.maxstack5 4.locals init(50classGSP.Bll.ThreeCountryGSP.Bll.ThreeCountry.ReportDataProcess model,61classGSP.CommonGSP.Common.Utils.EmailUtil emailUtil,72string ,83string ,94valuetypemscorlibSystem.DateTime dtNow,105valuetypemscorlibSystem.DateTime dtNext,116classmscorl

14、ibSystem.Exception exc,127string CSmessagemessage00,138valuetypemscorlibSystem.DateTime CSmessagemessage01,149valuetypemscorlibSystem.DateTime CSmessagemessage02,1510int32 CSmessagemessage03,1611valuetypemscorlibSystem.DateTime CSmessagemessage04,1712int32 CSmessagemessage05,1813string CSmessagemess

15、age06,1914valuetypemscorlibSystem.DateTime CSmessagemessage07)20 L_0000：call valuetypemscorlibSystem.DateTimemscorlibSystem.DateTime：get_Now()21 L_0005：callclass ExcelAutoReport.SystemConfiguration ExcelAutoReport.SystemConfiguration：GetInstance()22 L_000a：callvirt instance valuetypemscorlibSystem.D

16、ateTime ExcelAutoReport.SystemConfiguration：get_GatherTime()23 L_000f：callboolmscorlibSystem.DateTime：op_LessThan(valuetypemscorlibSystem.DateTime,valuetypemscorlibSystem.DateTime)24 L_0014：brfalse.s L_002f 25 L_0016：callclass ExcelAutoReport.SystemConfiguration ExcelAutoReport.SystemConfiguration：G

17、etInstance()26 L_001b：callvirt instance valuetypemscorlibSystem.DateTime ExcelAutoReport.SystemConfiguration：get_GatherTime()27 L_0020：call valuetypemscorlibSystem.DateTimemscorlibSystem.DateTime：get_Now()28 L_0025：call valuetypemscorlibSystem.TimeSpanmscorlibSystem.DateTime：op_Subtraction(valuetype

18、mscorlibSystem.DateTime,valuetypemscorlibSystem.DateTime)29 L_002a：callvoidmscorlibSystem.Threading.Thread：Sleep(valuetypemscorlibSystem.TimeSpan)30 L_002f：l dsfldclasslog4netlog4net.ILog ExcelAutoReport.SftxExcelAutoReport：log 31 L_0034：ldstru90aeu4ef6u53d1u9001u5f00u59cbuff0132 L_0039：callvirt ins

19、tancevoidlog4netlog4net.ILog：Info(object)33 L_003e：newobj instancevoidGSP.Bll.ThreeCountryGSP.Bll.ThreeCountry.ReportDataProcess：.ctor()34 L_0043：stloc.0 35 L_0044：ldloc.0 36 L_0045：callvirt instancevoidGSP.Bll.ThreeCountryGSP.Bll.ThreeCountry.ReportDataProcess：GenerateReport()37 L_004a：newobj insta

20、ncevoidGSP.CommonGSP.Common.Utils.EmailUtil：.ctor()38 L_004f：stloc.1 39 L_0050：callclassSystemSystem.Collections.Specialized.NameValueCollectionSystemSystem.Configuration.ConfigurationSettings：get_AppSettings()40 L_0055：ldstr41 L_005a：callvirt instancestringSystemSystem.Collections.Specialized.NameV

21、alueCollection：get_Item(string)42 L_005f：callvirt instancestringmscorlibSystem.Object：ToString()43 L_0064：stloc.2 44 L_0065：callclassSystemS ystem.Collections.Specialized.NameValueCollectionSystemSystem.Configuration.ConfigurationSettings：get_AppSettings()45 L_006a：ldstr46 L_006f：callvirt instancest

22、ringSystemSystem.Collections.Specialized.NameValueCollection：get_Item(string)47 L_0074：callvirt instancestringmscorlibSystem.Object：ToString()48 L_0079：stloc.3 49 L_007a：ldloc.1 50 L_007b：ldc.i4.1 51 L_007c：callvirt instancevoidGSP.CommonGSP.Common.Utils.EmailUtil：set_IsBodyHtml(bool)52 L_0081：ldloc

23、.1 53 L_0082：ldc.i4.7 54 L_0083：newarrstring 55 L_0088：stloc.s CSmessagemessage00 56 L_008a：ldloc.s CSmessagemessage00 57 L_008c：ldc.i4.0 58 L_008d：call valuetypemscorlibSystem.DateTimemscorlibSystem.DateTime：get_Now()59 L_0092：stloc.s CSmessagemessage01 60 L_0094：ldloca.s CSmessagemessage01 61 L_00

24、96：ldstryyyy62 L_009b：call instancestringmscorlibSystem.DateTime：ToString(string)63 L_00a0：stelem.ref 64 L_00a1：ldloc.s CSmessagemessage00 65 L_ 00a3：ldc.i4.1 66 L_00a4：ldstru5e7467 L_00a9：stelem.ref 68 L_00aa：ldloc.s CSmessagemessage00 69 L_00ac：ldc.i4.2 70 L_00ad：call valuetypemscorlibSystem.DateT

25、imemscorlibSystem.DateTime：get_Now()71 L_00b2：stloc.s CSmessagemessage02 72 L_00b4：ldloca.s CSmessagemessage02 73 L_00b6：call instance int32mscorlibSystem.DateTime：get_Month()74 L_00bb：stloc.s CSmessagemessage03 75 L_00bd：ldloca.s CSmessagemessage03 76 L_00bf：call instancestringmscorlibSystem.Int32：

26、ToString()77 L_00c4：stelem.ref 78 L_00c5：ldloc.s CSmessagemessage00 79 L_00c7：ldc.i4.3 80 L_00c8：ldstru670881 L_00cd：stelem.ref 82 L_00ce：ldloc.s CSmessagemessage00 83 L_00d0：ldc.i4.4 84 L_00d1：call valuetypemscorlibSystem.DateTimemscorlibSystem.DateTime：get_Now()85 L_00d6：stloc.s CSmessagemessage04

27、 86 L_00d8：ldloca.s CSmessagemessage04 87 L_00da：call instance int32mscorlibSystem.DateTime：get_Day()88 L_00df：stloc.s CSmessagemessage05 89 L_00e1：ldloca.s CSmessagemessage05 90 L_00e 3：call instancestringmscorlibSystem.Int32：ToString()91 L_00e8：stelem.ref 92 L_00e9：ldloc.s CSmessagemessage00 93 L_

28、00eb：ldc.i4.5 94 L_00ec：ldstru65e595 L_00f1：stelem.ref 96 L_00f2：ldloc.s CSmessagemessage00 97 L_00f4：ldc.i4.6 98 L_00f5：callclassSystemSystem.Collections.Specialized.NameValueCollectionSystemSystem.Configuration.ConfigurationSettings：get_AppSettings()99 L_00fa：ldstrEmailTitle100 L_00ff：callvirt ins

29、tancestringSystemSystem.Collections.Specialized.NameValueCollection：get_Item(string)101 L_0104：callvirt instancestringmscorlibSystem.Object：ToString()102 L_0109：stelem.ref 103 L_010a：ldloc.s CSmessagemessage00 104 L_010c：callstringmscorlibSystem.String：Concat(string)105 L_0111：callvirt instancevoidG

30、SP.CommonGSP.Common.Utils.EmailUtil：set_EmailTitle(string)106 L_0116：ldloc.1 107 L_0117：callclassSystemSystem.Collections.Specialized.NameValueCollectionSystemSystem.Configuration.ConfigurationSettings：get_AppSettings()108 L_011c：ldstrEmSubject109 L_0121：callvirt instancestringSystemSystem.Collectio

31、ns.Specialized.NameValueCollection：get_Item(string)110 L_0126：callvirt instancestringmscorlibSystem.Object：ToString()111 L_012b：callvirt instancevoidGSP.CommonGSP.Common.Utils.EmailUtil：set_EmSubject(string)112 L_0130：ldloc.1 113 L_0131：callclassSystemSystem.Collections.Specialized.NameValueCollecti

32、onSystemSystem.Configuration.ConfigurationSettings：get_AppSettings()114 L_0136：ldstrSendEmil115 L_013b：callvirt instancestringSystemSystem.Collections.Specialized.NameValueCollection：get_Item(string)116 L_0140：callvirt instancestringmscorlibSystem.Object：ToString()117 L_0145：callvirt instancevoidGSP

33、.CommonGSP.Common.Utils.EmailUtil：set_SendEmilPerson(string)118 L_014a：ldloc.1 119 L_014b：callclassSystemSystem.Collections.Specialized.NameValueCollectionSystemSystem.Configuration.ConfigurationSettings：get_AppSettings()120 L_0150：ldstrToEmail121 L_0155：callvirt instancestringSystemSystem.Collectio

34、ns.Specialized.NameValueCollection：get_Item(string)122 L_015a：callvirt instancestringmscorlibSystem.Object：ToString()123 L_015f：callvirt instancevoidGSP.CommonGSP.Common.Utils.EmailUtil：set_ToEmail(string)124 L_0164：ldloc.1 125 L_0165：callclassSystemSystem.Collections.Specialized.NameValueCollection

35、SystemSystem.Configuration.ConfigurationSettings：get_AppSettings()126 L_016a：ldstrSendEmil127 L_016f：callvirt instancestringSystemSystem.Collections.Specialized.NameValueCollection：get_Item(string)128 L_0174：callvirt instancestringmscorlibSystem.Object：ToString()129 L_0179：callvirt instancevoidGSP.C

36、ommonGSP.Common.Utils.EmailUtil：set_FromEmail(string)130 L_017e：ldloc.1 131 L_017f：callclassSystemSystem.Collections.Specialized.NameValueCollectionSystemSystem.Configuration.ConfigurationSettings：get_AppSettings()132 L_0184：ldstrSend EmailAcount133 L_0189：callvirt instancestringSystemSystem.Collect

37、ions.Specialized.NameValueCollection：get_Item(string)134 L_018e：callvirt instancestringmscorlibSystem.Object：ToString()135 L_0193：callvirt instancevoidGSP.CommonGSP.Common.Utils.EmailUtil：set_SendEmailAcount(string)136 L_0198：ldloc.1 137 L_0199：callclassSystemSystem.Collections.Specialized.NameValue

38、CollectionSystemSystem.Configuration.ConfigurationSettings：get_AppSettings()138 L_019e：ldstrSendEmialPswd139 L_01a3：callvirt instancestringSystemSystem.Collections.Specialized.NameValueCollection：get_Item(string)140 L_01a8：callvirt instancestringmscorlibSystem.Object：ToString()141 L_01ad：callvirt in

39、stancevoidGSP.CommonGSP.Common.Utils.EmailUtil：set_SendEmailPsd(string)142 L_01b2：ldloc.1 143 L_01b3：ldloc.3 144 L_01b4：ldloc.2 145 L_01b5：callvirt instancevoidGSP.CommonGSP.Common.Utils.EmailUtil：SetEmailAttactment(string,string)146 L_01ba：ldloc.1 147 L_01bb：callclassSystemSystem.Collections.Specia

40、lized.NameValueCollectionSystemSystem.Configuration.ConfigurationSettings：get_AppSettings()148 L_01c0：ldstrSmtpHost149 L_01c5：callvirt instancestringSystemSystem.Collections.Specialized.NameValueCollection：get_Item(string)150 L_01ca：callvirt instancestringmscorlibSystem.Object：ToString()151 L_01cf：c

41、allvirt instancevoidGSP.CommonGSP.Common.Utils.EmailUtil：set_SmtpHost(string)152 L_01d4：ldloc.1 153 L_01d5：callclassSystemSystem.Collections.Specialized.NameValueCollectionSystemSystem.Configuration.ConfigurationSettings：get_AppSettings()154 L_01da：ldstrSmtpServePort155 L_01df：callvirt instancestrin

42、gSystemSystem.Collections.Specialized.NameValueCollection：get_Item(string)156 L_01e4：callvirt instancestringmscorlibSystem.Object：ToString()157 L_01e9：callvirt instancevoidGSP.CommonGSP.Common.Utils.EmailUtil：set_SmtpServePort(string)158 L_01ee：ldloc.1 159 L_01ef：callclassSystemSystem.Collections.Sp

43、ecialized.NameValueCollectionSystemSystem.Configuration.ConfigurationSettings：get_AppSettings()160 L_01f4：ldstrEmailContent161 L_01f9：callvirt instancestringSystemSystem.Collections.Specialized.NameValueCollection：get_Item(string)162 L_01fe：callvirt instancestringmscorlibSystem.Object：ToString()163

44、L_0203：callvirt instancevoidGSP.CommonGSP.Common.Utils.EmailUtil：set_EmailContent(string)164 L_0208：ldloc.1 165 L_0209：callvirt instancevoidGSP.CommonGSP.Common.Utils.EmailUtil：SendEmail()166 L_020e：ldsfldclasslog4netlog4net.ILog ExcelAutoReport.SftxExcelAutoReport：log 167 L_0213：ldstru90aeu4ef6u53d

45、1u9001u6210u529fuff01168 L_0218：callvirt instancevoidlog4netlog4net.ILog：Info(object)169 L_021d：call valuetypemscorlibSystem.DateTimemscorlibSystem.DateTime：get_Now()170 L_0222：stloc.s dtNow 171 L_0224：ldc.i4.5 172 L_0225：newarrstring 173 L_022a：stloc.s CSmessagemessage06 174 L_022c：ldloc.s CSmessag

46、emessage06 175 L_022e：ldc.i4.0 176 L_022f：call valuetypemscorlibSystem.DateTimemscorlibSystem.DateTime：get_Now()177 L_0234：stloc.s CSmessagemessage07 178 L_0236：ldloca.s CSmessagemessage07 179 L_0238：ldstryyyy-MM-dd180 L_023d：call instancestringmscorlibSystem.DateTime：ToString(string)181 L_0242：stel

47、em.ref 182 L_0243：ldloc.s CSmessagemessage06 183 L_0245：ldc.i4.1 184 L_0246：ldstr185 L_024b：stelem.ref 186 L_024c：ldloc.s CSmessagemessage06 187 L_024e：ldc.i4.2 188 L_024f：callclass ExcelAutoReport.SystemConfiguration ExcelAutoReport.SystemConfiguration：GetInstance()189 L_0254：callvirt instancestrin

48、g ExcelAutoReport.SystemConfiguration：get_GatherHour()190 L_0259：stelem.ref 191 L_025a：ldloc.s CSmessagemessage06 192 L_025c：ldc.i4.3 193 L_025d：ldstr：194 L_0262：stelem.ref 195 L_0263：ldloc.s CSmessagemessage06 196 L_0265：ldc.i4.4 197 L_0266：callclass ExcelAutoReport.SystemConfiguration ExcelAutoRep

49、ort.SystemConfiguratio n：GetInstance()198 L_026b：callvirt instancestring ExcelAutoReport.SystemConfiguration：get_GatherMinute()199 L_0270：stelem.ref 200 L_0271：ldloc.s CSmessagemessage06 201 L_0273：callstringmscorlibSystem.String：Concat(string)202 L_0278：call valuetypemscorlibSystem.DateTimemscorlib

50、System.Convert：ToDateTime(string)203 L_027d：stloc.s dtNext 204 L_027f：ldloca.s dtNext 205 L_0281：ldc.r81 206 L_028a：call instance valuetypemscorlibSystem.DateTimemscorlibSystem.DateTime：AddDays(float64)207 L_028f：ldloc.s dtNow 208 L_0291：call valuetypemscorlibSystem.TimeSpanmscorlibSystem.DateTime：o

51、p_Subtraction(valuetypemscorlibSystem.DateTime,valuetypemscorlibSystem.DateTime)209 L_0296：callvoidmscorlibSystem.Threading.Thread：Sleep(valuetypemscorlibSystem.TimeSpan)210 L_029b：leave L_0000 211 L_02a0：stloc.s exc 212 L_02a2：ldsfldclasslog4netlog4net.ILog ExcelAutoReport.SftxExcelAutoReport：log 213 L_02a7：ldloc.s exc 214 L_ 02a9：callvirt instancestringmscorlibSystem.Object：ToString()215 L_02ae：callvirt instancevoidlog4netlog4net.ILog：Error(object)216 L_02b3：ldstru51f