applicationlog.cs

频繁模式挖掘搜索给顶数据几中反复出现的联系.介绍发现事物或关系数据库中关联

using System;
using System.Configuration;
using System.Diagnostics;
using System.IO;
using System.Text;
using System.Threading;

namespace jianshiFile
{
	/// <summary>
	/// Class1 的摘要说明。
	/// </summary>
	public class ApplicationLog
	{
		//This object is added as a debug listener.
		private static StreamWriter debugWriter;
		
		public static String FormatException(Exception ex, String catchInfo)
		{
			StringBuilder strBuilder = new StringBuilder();

			strBuilder.Append("基本内容:");
			if (catchInfo != String.Empty)
			{
				strBuilder.Append(catchInfo).Append("\r\n");
			}
			strBuilder.Append(ex.Message).Append("\r\n").Append(ex.StackTrace).Append("\r\n").Append(DateTime.Now.ToString()).Append("\r\n\r\n");
			return strBuilder.ToString();
		}
		
		public static void WriteLog( Exception ex, String catchInfo)
		{
			WriteLog(FormatException( ex,  catchInfo));

		}

		/// <summary>
		///     Determine where a string needs to be written based on the
		///     configuration settings and the error level.
		///     <param name="level">The severity of the information to be logged.</param>
		///     <param name="messageText">The string to be logged.</param>
		/// </summary>
		public static void WriteLog( String messageText)
		{
			//
			// Be very careful by putting a Try/Catch around the entire routine.
			//   We should never throw an exception while logging.
			//
			try
			{
				//
				// Write the message to the trace file
				//
        
				//Make sure a tracing file is specified.
				if (debugWriter != null)
				{
					lock(debugWriter)
					{
						//写入Log文件
						Debug.WriteLine(messageText);
						debugWriter.Flush();

						//显示到屏幕

						Trace.WriteLine(messageText);
						Trace.Flush();


					}
				}
        
			}
			catch {} //Ignore any exceptions.
		}
        
		
		static ApplicationLog()
		{
        
			//Protect thread locks with Try/Catch to guarantee that we let go of the lock.
			try
			{
        
				//See if there is a debug configuration file specified and set up the
				//  tracing variables.
				bool clearSettings = true;
				try
				{
					String tracingFile = System.Configuration.ConfigurationSettings.AppSettings.GetValues("TracingTraceFile")[0].ToString();
					FileInfo file = new FileInfo(tracingFile);
					debugWriter = new StreamWriter(file.Open(FileMode.Append, FileAccess.Write, FileShare.ReadWrite));
					Debug.Listeners.Add(new TextWriterTraceListener(debugWriter));
					


					TextWriterTraceListener consoleWriter = new 
						TextWriterTraceListener(System.Console.Out);
					
					Trace.Listeners.Add(consoleWriter);
	


					clearSettings = false;

				}
				catch
				{
					//Ignore the error
				}
            
				//Use default (empty) values if something went wrong
				if (clearSettings)
				{
					debugWriter = null;
				}
			}
			finally
			{
				//Remove the lock from the class object
				//Monitor.Exit(myType);
			}
		}
		
	}
}