日志紀錄到文本和xml實現方式

interface ILog
...{
    bool Write(string message);
    bool Write(Exception ex);
}

 

class TextFileLog:ILog
...{
    public bool Write(string message)
    ...{
        string fileDir = ConfigurationManager.APPSettings["LogTarget"].ToString();
        using (StreamWriter w = File.AppendText(fileDir))
        ...{
           // w.Write(" Log Entry : ");
            w.WriteLine("發生時間{0}", DateTime.Now.ToLocalTime().ToString());
            w.WriteLine("日志內容為:{0}", message);
            w.WriteLine("-------------------------------");
            // Update the underlying file.
            w.Flush();
            w.Close();
        }
        return true;
    }
    public bool Write(Exception ex)
    ...{

        Write(ex.Message);
        return true;
    }
}

 

class XMLFileLog:ILog
    ...{
        public bool Write(string message)
        ...{
            string XMLFilePath = ConfigurationManager.APPSettings["LogTarget"].ToString();
            if (File.Exists(XMLFilePath))
            ...{
                XmlDocument doc = new XMLDocument();
                doc.Load(XMLFilePath);
         XMLDocumentFragment docFrag = doc.CreateDocumentFragment();
                XMLNode nod = doc.SelectSingleNode("Logs");
                docFrag.InnerXML = "<Log><Time>"+DateTime.Now.ToLocalTime().ToString()
                    +"</Time><Message>"+message+"</Message></Log>";
                nod.AppendChild(docFrag);

                doc.Save(XMLFilePath);
                return true;
            }
            else
            ...{
                XmlWriterSettings settings = new XMLWriterSettings();
                settings.Indent = true;     //設置縮進       
                settings.ConformanceLevel = ConformanceLevel.Auto;
                settings.IndentChars = " ";
                settings.OmitXMLDeclaration = false;
                using (XmlWriter writer = XmlWriter.Create(XMLFilePath, settings))
                ...{
                    //Start writing the XML document
          writer.WriteStartDocument(false);
                    //Start with the root element
                    writer.WriteStartElement("Logs");
                    writer.WriteStartElement("Log");
                    writer.WriteStartElement("Time");
                    writer.WriteString(DateTime.Now.ToLocalTime().ToString());
                    writer.WriteEndElement();
                    writer.WriteStartElement("Message");
                    writer.WriteString(message);
                    writer.WriteEndElement();
                    writer.WriteEndElement();
                    writer.WriteEndDocument();
                    //Flush the object and write the XML data to the file
                    writer.Flush();
                    return true;
                }   

            }
        }
        public bool Write(Exception ex)
        ...{
            Write(ex.Message);
            return true;

        }
    }

測試

  class Program
    ...{
        static void Main(string[] args)
        ...{
            System.Type type = System.Type.GetType(ConfigurationManager.APPSettings["LogType"].ToString());
            ILog log = (ILog)Activator.CreateInstance(type);
            log.Write(new Exception("異常測試"));
        }
    }

config配置為：

<?XML version="1.0" encoding="utf-8" ?>
<configuration>
 <aPPSettings>
  <add key="LogType" value="XMLFileLog"/>
  <!-- XMLFileLog  TextFileLog-->
  <add key="LogTarget" value="c:\log.XML"/>
 </aPPSettings>
</configuration>

數據庫實現的話繼承Ilog接口即可