从方法内向字符串中间添加其他内容

Question

我正在处理日志文件，并且我有一个方法正在创建一个通用条目到日志中。通用日志条目如下所示：

public StringBuilder GetLogMessage(LogEventType logType, object message) 
{ 
     StringBuilder logEntry = new StringBuilder(); 
     logEntry.AppendFormat("DATE={0} ", DateTime.Now.ToString("dd-MMM-yyyy", new CultureInfo(CommonConfig.EnglishCultureCode))); 
     logEntry.AppendFormat("TIME={0} ", DateTime.Now.ToString("HH:mm:ss", new CultureInfo(CommonConfig.EnglishCultureCode))); 
     logEntry.AppendFormat("ERRORNO={0} ", base.RemoteIPAddress.ToString().Replace(".", string.Empty)); 
     logEntry.AppendFormat("IP={0}", base.RemoteIPAddress.ToString()); 
     logEntry.AppendFormat("LANG={0} ", base.Culture.TwoLetterISOLanguageName); 
     logEntry.AppendFormat("PNR={0} ", this.RecordLocator); 
     logEntry.AppendFormat("AGENT={0} ", base.UserAgent); 
     logEntry.AppendFormat("REF={0} ", base.Referrer); 
     logEntry.AppendFormat("SID={0} ", base.CurrentContext.Session.SessionID); 
     logEntry.AppendFormat("LOGTYPE={0} ", logType.ToString()); 
     logEntry.AppendFormat("MESSAGE={0} ", message); 
     return logEntry; 
} 

在“MESSAGE =”之前添加其他参数的最佳方法是什么？例如，如果我想在GetLogMessage运行时从派生类中添加“MODULE =”。一个委托人会成为我正在寻找的东西，还是将该方法标记为虚拟并覆盖它，还是需要完全不同的东西？

任何帮助，将不胜感激。

Answer 1

怎么样这种方法：

public StringBuilder GetLogMessage(LogEventType logType, object message) 
{ 
    return GetLogMessage(logType, message, null); 
} 

public StringBuilder GetLogMessage(LogEventType logType, object message, Dictionary<string,string> extraParameters) 
{ 
     StringBuilder logEntry = new StringBuilder(); 
     logEntry.AppendFormat("DATE={0} ", DateTime.Now.ToString("dd-MMM-yyyy", new CultureInfo(CommonConfig.EnglishCultureCode))); 
     logEntry.AppendFormat("TIME={0} ", DateTime.Now.ToString("HH:mm:ss", new CultureInfo(CommonConfig.EnglishCultureCode))); 
     logEntry.AppendFormat("ERRORNO={0} ", base.RemoteIPAddress.ToString().Replace(".", string.Empty)); 
     logEntry.AppendFormat("IP={0}", base.RemoteIPAddress.ToString()); 
     logEntry.AppendFormat("LANG={0} ", base.Culture.TwoLetterISOLanguageName); 
     logEntry.AppendFormat("PNR={0} ", this.RecordLocator); 
     logEntry.AppendFormat("AGENT={0} ", base.UserAgent); 
     logEntry.AppendFormat("REF={0} ", base.Referrer); 
     logEntry.AppendFormat("SID={0} ", base.CurrentContext.Session.SessionID); 
     logEntry.AppendFormat("LOGTYPE={0} ", logType.ToString()); 
     if(extraParameters != null) 
     { 
      foreach(var s in extraParameters.Keys) 
      { 
        logEntry.AppendFormat("{0}={1} ", s, extraParameters[s]); 
      } 
     } 
     logEntry.AppendFormat("MESSAGE={0} ", message); 
     return logEntry; 
} 

Answer 2

如果你想只是追加相关的子类重写虚方法（和调用之初基本实现）的一些信息是最好的合适的解决方案;）

Answer 3

public StringBuilder GetLogMessage(LogEventType logType, object message) 
{ 
     StringBuilder logEntry = new StringBuilder(); 
     logEntry.AppendFormat("DATE={0} ", DateTime.Now.ToString("dd-MMM-yyyy", new CultureInfo(CommonConfig.EnglishCultureCode))); 
     logEntry.AppendFormat("TIME={0} ", DateTime.Now.ToString("HH:mm:ss", new CultureInfo(CommonConfig.EnglishCultureCode))); 
     logEntry.AppendFormat("ERRORNO={0} ", base.RemoteIPAddress.ToString().Replace(".", string.Empty)); 
     logEntry.AppendFormat("IP={0}", base.RemoteIPAddress.ToString()); 
     logEntry.AppendFormat("LANG={0} ", base.Culture.TwoLetterISOLanguageName); 
     logEntry.AppendFormat("PNR={0} ", this.RecordLocator); 
     logEntry.AppendFormat("AGENT={0} ", base.UserAgent); 
     logEntry.AppendFormat("REF={0} ", base.Referrer); 
     logEntry.AppendFormat("SID={0} ", base.CurrentContext.Session.SessionID); 
     logEntry.AppendFormat("LOGTYPE={0} ", logType.ToString()); 

     var module_log = GetModuleLog();   
     logEntry.AppendFormat("MODULE={0}", (!String.IsNullOrEmpty(module_log)) 
        ?module_log 
        :String.Empty); 

     logEntry.AppendFormat("MESSAGE={0} ", message); 
     return logEntry; 
} 

protected virtual string GetModuleLog(){ 
// code in the derived class to return the log related to the module... 
} 

HTH。

Answer 4

假设日志消息总是可以添加该子类可以实现自己的详细信息添加到该消息的虚方法相同的格式：

public StringBuilder GetLogMessage(LogEventType logType, object message) 
{ 
    StringBuilder logEntry = new StringBuilder(); 
    logEntry.AppendFormat("DATE={0} ", DateTime.Now.ToString("dd-MMM-yyyy", new CultureInfo(CommonConfig.EnglishCultureCode))); 
    //... 

    this.AddMessageDetail(logEntry); 
    logEntry.AppendFormat("MESSAGE={0} ", message); 
    return logEntry; 
} 

protected virtual void AddMessageDetail(StringBuilder logMessage) 
{ 
} 

然而，这打破了，如果子类需要改变结构的消息。