上一篇《系统操作日志设计》，已基本介绍了为什么要系统操作日志和设计系统操作日志部分内容，如不清楚系统操作日志的请点这里。 :)

通了解《系统操作日志设计》，已基本明确我们不能通过clone的方式来做日志的设计，因为这样不仅会造成的你数据库表爆炸的情况，还大大的增加了工作量，减少了系统的可维护性。

通过思考大概清楚系统操作日志的设计，以下是其UML图：

通过上图，我们可以了解知道该UML主要由三个表组成，其中一个主表LogSetting和两个从表分别是LogOperation和LogSettingDetail。

那么怎么样才能通过这样的设计来现实我们的日志功能呢？

其实一开始我就觉得通过.net的反射功能可以很简单、很方便的实现这个功能，所以我就顺着一个思路来实现她；通过反射动态的获取Model实体的属性，然后再根据LogSettingDetail配置来匹配所要记录的字段信息。

先来主要的代码吧，发现将思想用文字表达出来还是较困难的，代码比较直接：

代码的实现

usingSystem;usingSystem.Data;usingSystem.Configuration;usingSystem.Web;usingSystem.Web.Security;usingSystem.Web.UI;usingSystem.Web.UI.WebControls;usingSystem.Web.UI.WebControls.WebParts;usingSystem.Web.UI.HtmlControls;usingBLL.Sys;usingSystem.Collections.Generic;usingSystem.Collections.Specialized;usingSystem.Text;usingSystem.Reflection;/// <summary>
///LogManager 的摘要说明/// </summary>public classLogManager<T>whereT :new()
{#regionConstructor/// <summary>///日志管理构造函数/// </summary>publicLogManager(){tableName =typeof(T).Name;Model.Sys.LogSettingmodel = GetLogSetting(tableName);if(model !=null){businessName = model.BusinessName;logID = model.LogID;primaryKey = model.PrimaryKey;urlTemplate = model.UrlTemplate;deleteScriptTemplate = model.DeleteScriptTemplate;updateScriptTemplate = model.UpdateScriptTemplate;}else{throw newArgumentNullException("日志设置为空！");}}/// <summary>//////日志管理构造函数/// </summary>/// </summary>/// <param name="tableName">表名</param>/// <param name="businessName">业务名称</param>publicLogManager(stringtableName,stringbusinessName){this.tableName = tableName;this.businessName = businessName;Model.Sys.LogSettingmodel = GetLogSetting(tableName, businessName);if(model !=null){logID = model.LogID;primaryKey = model.PrimaryKey;urlTemplate = model.UrlTemplate;deleteScriptTemplate = model.DeleteScriptTemplate;updateScriptTemplate = model.UpdateScriptTemplate;}else{throw newArgumentNullException("日志设置为空！");}}#endregion#regionPropertiesprivate intlogID;private stringtableName;private stringbusinessName;private stringprimaryKey;private stringurlTemplate;private stringdeleteScriptTemplate;private stringupdateScriptTemplate;/// <summary>///日志设置实体列表/// </summary>publicList<Model.Sys.LogSetting> LogSettingList{get{System.Web.Caching.Cachecache =HttpRuntime.Cache;List<Model.Sys.LogSetting> list = cache["LogSettingList"]asList<Model.Sys.LogSetting>;if(list !=null&& list.Count > 0){returnlist;}else{LogSettingbll =newLogSetting();list = bll.GetModelList(string.Empty);cache["LogSettingList"] = list;returnlist;}}set{System.Web.Caching.Cachecache =HttpRuntime.Cache;cache["LogSettingList"] =null;}}/// <summary>///日志设置明细/// </summary>publicList<Model.Sys.LogSettingDetail> LogSettingDetail{get{System.Web.Caching.Cachecache =HttpRuntime.Cache;List<Model.Sys.LogSettingDetail> list = cache["LogSettingDetail"]asList<Model.Sys.LogSettingDetail>;if(list !=null&& list.Count > 0){returnlist;}else{LogSettingDetailbll =newLogSettingDetail();list = bll.GetModelList(string.Empty);cache["LogSettingDetail"] = list;returnlist;}}set{System.Web.Caching.Cachecache =HttpRuntime.Cache;cache["LogSettingDetail"] =null;}}#endregion#regionMethod/// <summary>///通过logId获取日志设置明细/// </summary>/// <param name="logId">日志设置编号</param>/// <returns></returns>privateList<Model.Sys.LogSettingDetail> GetLogSettingDetails(intlogId){if(logId == 0)throw newArgumentNullException("LogID为空");List<Model.Sys.LogSettingDetail> list =newList<Model.Sys.LogSettingDetail>();foreach(Model.Sys.LogSettingDetailvarinLogSettingDetail){if(var.LogID == logId)list.Add(var);}returnlist;}/// <summary>///通过tableName和businessName来获取日志设置对象/// </summary>/// <param name="tableName"></param>/// <param name="businessName"></param>/// <returns></returns>privateModel.Sys.LogSettingGetLogSetting(stringtableName,stringbusinessName){foreach(Model.Sys.LogSettingvarinLogSettingList){if(var.TableName.Equals(tableName,StringComparison.InvariantCultureIgnoreCase) && var.BusinessName.Equals(businessName,StringComparison.InvariantCultureIgnoreCase))returnvar;}return null;}privateModel.Sys.LogSettingGetLogSetting(stringtableName){foreach(Model.Sys.LogSettingvarinLogSettingList){if(var.TableName.Equals(tableName,StringComparison.InvariantCultureIgnoreCase))returnvar;}return null;}/// <summary>///比较两个实体，然后返回实体中每个属性值不同的内容/// </summary>/// <param name="oldObj"></param>/// <param name="newObj"></param>/// <returns></returns>public stringCompare(T oldObj, T newObj){TypeobjTye =typeof(T);StringBuildersbResult =newStringBuilder();stringtableHeader ="<table class=/"GridView/" cellspacing=/"0/" rules=/"all/" border=/"1/" id=/"gv/" style=/"border-collapse:collapse;/">";tableHeader +="<tr><th scope=/"col/">序号</th><th scope=/"col/">字段</th><th scope=/"col/">名称</th><th scope=/"col/">旧值</th><th scope=/"col/">新值</th></tr>";stringtableRow ="<tr class='{0}'><td>{1}</td><td>{2}</td><td>{3}</td><td>{4}</td><td>{5}</td></tr>";List<Model.Sys.LogSettingDetail> list = GetLogSettingDetails(logID);inti = 1;foreach(Model.Sys.LogSettingDetailvarinlist){PropertyInfoproperty = objTye.GetProperty(var.ColumnName);if(property !=null&& !property.IsSpecialName){objecto = property.GetValue(oldObj,null);objectn = property.GetValue(newObj,null);if(!IsEqual(property.PropertyType, o, n)){sbResult.AppendFormat(tableRow, i % 2 == 0 ?"odd":"even", i, var.ColumnName, var.ColumnText, o, n);i++;}}}sbResult.Append("</table>");#regionAdd Log Recordif(i > 1){Model.Sys.LogOperationoperModel =newModel.Sys.LogOperation();operModel.LogID = logID;operModel.OperationType = (int)OperationType.Update;operModel.Content = tableHeader + sbResult.ToString();operModel.CreateTime =DateTime.Now;if(HttpContext.Current !=null)operModel.CreateUser =HttpContext.Current.User.Identity.Name;if(!string.IsNullOrEmpty(primaryKey)){PropertyInfop = objTye.GetProperty(primaryKey);objecto = p.GetValue(newObj,null);if(o !=null){operModel.PrimaryKeyValue = o.ToString();if(urlTemplate.Contains("{0}"))operModel.Url =string.Format(urlTemplate, o.ToString());}}LogOperationoperBll =newLogOperation();operBll.Add(operModel);}#endregionreturntableHeader + sbResult.ToString();}/// <summary>///删除实体操作，这里并不是真的删除该实体，而是将删除的操作记录在日志中/// </summary>/// <param name="obj"></param>/// <returns></returns>public stringDelete(T obj){TypeobjTye =typeof(T);StringBuildersbResult =newStringBuilder();stringtableHeader ="<table class=/"GridView/" cellspacing=/"0/" rules=/"all/" border=/"1/" id=/"gv/" style=/"border-collapse:collapse;/">";tableHeader +="<tr><th scope=/"col/">序号</th><th scope=/"col/">字段</th><th scope=/"col/">名称</th><th scope=/"col/">值</th></tr>";stringtableRow ="<tr class='{0}'><td>{1}</td><td>{2}</td><td>{3}</td><td>{4}</td></tr>";List<Model.Sys.LogSettingDetail> list = GetLogSettingDetails(logID);inti = 1;foreach(Model.Sys.LogSettingDetailvarinlist){PropertyInfoproperty = objTye.GetProperty(var.ColumnName);if(property !=null&& !property.IsSpecialName){objecto = property.GetValue(obj,null);sbResult.AppendFormat(tableRow, i % 2 == 0 ?"odd":"even", i, var.ColumnName, var.ColumnText, o);i++;}}sbResult.Append("</table>");#regionAdd Log Record       Model.Sys.LogOperationoperModel =newModel.Sys.LogOperation();operModel.LogID = logID;operModel.OperationType = (int)OperationType.Delete;operModel.Content = tableHeader + sbResult.ToString();operModel.CreateTime =DateTime.Now;if(!string.IsNullOrEmpty(primaryKey)){PropertyInfop = objTye.GetProperty(primaryKey);objecto = p.GetValue(obj,null);if(o !=null){operModel.PrimaryKeyValue = o.ToString();if(urlTemplate.Contains("{0}"))operModel.Url =string.Format(urlTemplate, o.ToString());}}if(HttpContext.Current !=null)operModel.CreateUser =HttpContext.Current.User.Identity.Name;LogOperationoperBll =newLogOperation();operBll.Add(operModel);#endregionreturn string.Empty;}/// <summary>///添加实体，将添加的操作记录在日志中/// </summary>/// <param name="obj"></param>/// <returns></returns>public stringAdd(T obj){TypeobjTye =typeof(T);StringBuildersbResult =newStringBuilder();stringtableHeader ="<table class=/"GridView/" cellspacing=/"0/" rules=/"all/" border=/"1/" id=/"gv/" style=/"border-collapse:collapse;/">";tableHeader +="<tr><th scope=/"col/">序号</th><th scope=/"col/">字段</th><th scope=/"col/">名称</th><th scope=/"col/">值</th></tr>";stringtableRow ="<tr class='{0}'><td>{1}</td><td>{2}</td><td>{3}</td><td>{4}</td></tr>";List<Model.Sys.LogSettingDetail> list = GetLogSettingDetails(logID);inti = 1;foreach(Model.Sys.LogSettingDetailvarinlist){PropertyInfoproperty = objTye.GetProperty(var.ColumnName);if(property !=null&& !property.IsSpecialName){objecto = property.GetValue(obj,null);sbResult.AppendFormat(tableRow, i % 2 == 0 ?"odd":"even", i, var.ColumnName, var.ColumnText, o);i++;}}sbResult.Append("</table>");#regionAdd Log Record      Model.Sys.LogOperationoperModel =newModel.Sys.LogOperation();operModel.LogID = logID;operModel.OperationType = (int)OperationType.Add;operModel.Content = tableHeader + sbResult.ToString();operModel.CreateTime =DateTime.Now;if(!string.IsNullOrEmpty(primaryKey)){PropertyInfop = objTye.GetProperty(primaryKey);objecto = p.GetValue(obj,null);if(o !=null){operModel.PrimaryKeyValue = o.ToString();if(urlTemplate.Contains("{0}"))operModel.Url =string.Format(urlTemplate, o.ToString());}}if(HttpContext.Current !=null)operModel.CreateUser =HttpContext.Current.User.Identity.Name;LogOperationoperBll =newLogOperation();operBll.Add(operModel);#endregionreturn string.Empty;}/// <summary>///复制一个对象/// </summary>/// <param name="obj"></param>/// <returns></returns>publicT Clone(T obj){TypeobjTye =typeof(T);T model =newT();PropertyInfo[] properties = objTye.GetProperties();foreach(PropertyInfopropertyinproperties){if(!property.IsSpecialName){objecto = property.GetValue(obj,null);property.SetValue(model, o,null);}}returnmodel;}private boolIsEqual(TypedataType,objectoldObj,objectnewObj){if(oldObj ==null&& newObj ==null)return true;if(dataType ==typeof(int)){return(int)oldObj == (int)newObj;}else if(dataType ==typeof(decimal)){return(decimal)oldObj == (decimal)newObj;}else if(dataType ==typeof(double)){return(double)oldObj == (double)newObj;}else if(dataType ==typeof(Guid)){return(Guid)oldObj == (Guid)newObj;}else if(dataType ==typeof(DateTime)){return(DateTime)oldObj == (DateTime)newObj;}elsereturnoldObj.Equals(newObj);}#regionScript. Excute//public int DeleteBusRecode(string primaryKeyValue)//{//    if (string.IsNullOrEmpty(tableName))//        throw new ArgumentException("tableName为空");//    if(string.IsNullOrEmpty(primaryKey))//        throw new ArgumentException("primaryKey为空");//    if (string.IsNullOrEmpty(deleteScriptTemplate))//        throw new ArgumentException("deleteScriptTemplate为空");//    string strSql = string.Format(deleteScriptTemplate, primaryKeyValue);//    Database db = DatabaseFactory.CreateDatabase();//    return 0;//}#endregion#endregion}public enumOperationType{Select = 0,Add = 1,Update = 2,Delete = 3
}

使用的场景

Model文件：

publicclassEmployeeModel{publicintID{get;set;}publicstringName{get;set;}…}

下面介绍如何将系统操作日志集成到你的业务系统中

添加操作：

EmployeeBll bll = new EmployeeBll();

EmployeeModel model = new EmployeeModel();

/* model 实体经过漫长的 赋值 后… */

bll.Add(model);    //添加实体

//添加系统操作记录

//日志LogManager<EmployeeModel> log =newLogManager<EmployeeModel>();

log.Add(model);

更新操作：

EmployeeBll bll = new EmployeeBll();

EmployeeModel model = bll.GetModel(employeeID);

LogManager<EmployeeModel> log =newLogManager<EmployeeModel>();

EmployeeModel modelOld = log.Clone(model);   //克隆EmployeeModel实体对象，这个主要是在系统操作日志记录时使用的

/* model 实体又经过漫长的 赋值 后… */

bll.Update(model);     //更新实体

//将更新的内容写入系统操作日志中

log.Compare(modelOld, model);    //原来的实体和赋值后的实体对比，并将更新的内容写入系统操作日志中

删除操作：

在GridView的RowDeleting事件中获取要删除的实体

EmployeeBll bll = new EmployeeBll();

EmployeeModel model = bll.GetModel(employeeID);

bll.Delete(employeeID);

LogManager<EmployeeModel> log =newLogManager<EmployeeModel>();
log.Delete(model);       //实体的内容记录到日志中

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总结：

大家可以看到代码还是比较粗糙的，有不少的重复的代码，下一节将会讨论如何进行系统操作日志管理。

另外如何大家有什么意见或想法请分享提出。

本节用到的知识点：

1、泛型

2、反射

3、缓存

优点：

1、使用和集成方便，代码量小；

2、大大提高工作效率，避免表爆炸；

缺点：

1、代码有待优化；

2、可扩展性较差