我自己经常用的，发出来大家共同学习
先要配置以下config文件
也可以是任意的xml文件
asp.net 就直接配置web.config文件
提供代码下载：http://www.cnblogs.com/Leodr/archive/2008/07/25/1251299.html （和一个网络文件夹一起的）
具体如下：（注——里面还有一些配置是我做的一个网络文件夹的配置信息，注释很清楚，自己看了。）
<?xml version="1.0"?>
<configuration>
<system.diagnostics>
<!--日志权重处理级别
0 Off 不输出跟踪和调试消息。
1 Error 输出错误处理消息。
2 Warning 输出警告和错误处理消息。
3 Info 输出信息性消息、警告和错误处理消息。
4 Verbose 输出所有调试和跟踪消息。
-->
<switches>
<add name="dSwitch" value="4"/>
<!-- 默认权重处理级别 -->
<add name="sdfs" value="2"/>
</switches>
<trace autoflush="true" indentsize="2"/>
</system.diagnostics>
<connectionStrings>
<add name="ConnectionString" connectionString="Data Source=RJB-ZYB;Initial Catalog=RenheOA2;User ID=sa"/>
</connectionStrings>
<appSettings>
<!-- 日至文件路径 -->
<add key="LogPath" value="logdir"/>
<!-- 日至是否写入事件查看器 -->
<add key="EventLog" value="true"/>
<!-- 共享文件夹默认目录-->
<add key="folderPath" value="Upload"/>
<!--上传文件类型-->
<add key="FileTypeLimit" value=".zip,.rar,.jpg,.gif,.bmp,.doc,.txt,.swf,.xls,.doc,.ppt"/>
<!--限制文件夹的总大小，单位为KB,102400KB=100M-->
<add key="FolderSizeLimit" value="40960"/>
</appSettings>
<system.web>
<sessionState mode="InProc" stateConnectionString="tcpip=127.0.0.1:42424" sqlConnectionString="data source=127.0.0.1;user id=sa;password=" cookieless="false" timeout="20"/>
<!-- 上传大文件设置-->
<httpRuntime executionTimeout="90" maxRequestLength="102400" useFullyQualifiedRedirectUrl="false"
minFreeThreads="8" minLocalRequestFreeThreads="4" appRequestQueueLimit="100"/>
<authentication mode="Windows"/>
<!--
<customErrors mode="RemoteOnly" defaultRedirect="GenericErrorPage.htm">
<error statusCode="403" redirect="NoAccess.htm" />
<error statusCode="404" redirect="FileNotFound.htm" />
</customErrors>
-->
<compilation debug="true" />
</system.web>
</configuration>
Logger类的代码如下。
1using System;
2using System.IO;
3using System.Diagnostics;
4using System.Configuration;
5
6
/**////---------------------------------------
7// Copyright (c) 2008 Liu Yi,
8// leodr.cnbolgs.com
9/**////---------------------------------------
10namespace LEO.Common
11
{
12
/**//// <summary>
13
/// 纪录跟踪系统错误日至的类.
14
/// </summary>
15 public class Logger
16 {
17 public const int INFO = 3;
18 public const int WARN = 2;
19 public const int ERROR= 1;
20 public const int ALWAYS=1;
21
22 protected static string strCurrentFilename = "";
23 protected static TraceSwitch dSwitch = null;
24 protected static FileStream fsLog = null;
25 protected static TextWriterTraceListener tlLog = null;
26 protected static bool bStickInEventLog = false;
27
28 public Logger()
29 {
30 dSwitch =
31 new TraceSwitch
32 ("dSwitch","Application tracing");
33 Trace.WriteLine("Just created dSwitch: " +
34 dSwitch.Level);
35
36 string strLogDir = System.Web.HttpContext.Current.Server.MapPath("~/") + ConfigurationManager.AppSettings["LogPath"].ToString();
37 if (!Directory.Exists(strLogDir)) Directory.CreateDirectory(strLogDir);
38
39 if( !(strLogDir==null) && !(strLogDir.Equals("")))
40 {
41
42 fsLog = new FileStream(strLogDir,
43 FileMode.OpenOrCreate);
44 tlLog = new
45 TextWriterTraceListener(fsLog);
46 Trace.Listeners.Add(tlLog);
47 }
48
49 string strEventLog = ConfigurationManager.AppSettings["EventLog"].ToString();
50 if( !(strLogDir==null) && !(strLogDir.Equals("")))
51 {
52 // 是否将日至写入事件查看器
53 if(strLogDir.ToLower().Equals("true"))
54 bStickInEventLog = true;
55 else
56 bStickInEventLog = false;
57 }
58
59 }
60
61 private static TraceSwitch GetTraceSwitch(string sName)
62 {
63 TraceSwitch ts = new TraceSwitch(
64 sName, "Integration Framework tracing");
65 return ts;
66 }//end GetTraceSwitch()
67
68 private static void SetupTracing()
69 {
70 dSwitch = GetTraceSwitch("dSwitch");
71 Trace.WriteLine("Just created dSwitch: " +
72 dSwitch.Level);
73 string strLogDir = System.Web.HttpContext.Current.Server.MapPath("~/") + ConfigurationManager.AppSettings["LogPath"].ToString();
74 string strLogfile = "";
75 string strFile = Logger.getCurrentFilename();
76
77 if (!Directory.Exists(strLogDir))
78 Directory.CreateDirectory(strLogDir);
79
80 if(strFile.Equals(""))
81 {
82 System.DateTime now = System.DateTime.Now;
83 strLogfile = strLogDir + "\\" +
84 "RENHEOA" +
85 now.DayOfYear.ToString() +
86 "-" +
87 now.Hour.ToString() +
88 "-" +
89 now.Minute.ToString() +
90 ".log";
91 Logger.setCurrentFilename(strLogfile);
92 strFile = strLogfile;
93 }
94
95 try
96 {
97 // 创建一个用于输出跟踪信息的文件
98 fsLog = new FileStream
99 (strFile,FileMode.OpenOrCreate);
100 if( !fsLog.CanWrite )
101 {
102 System.DateTime now = System.DateTime.Now;
103 strLogfile = strLogDir + "\\" +
104 "RENHEOA" +
105 now.DayOfYear.ToString() +
106 "-" +
107 now.Hour.ToString() +
108 "-" +
109 now.Minute.ToString() +
110 ".log";
111 Logger.setCurrentFilename(strLogfile);
112 fsLog = new FileStream
113 (strFile,FileMode.OpenOrCreate);
114 }//end if
115
116 tlLog = new
117 TextWriterTraceListener(fsLog);
118 Trace.Listeners.Add(tlLog);
119 }
120 catch(Exception exc)
121 {
122 // 出现异常
123
124 }//end catch
125
126 string strEventLog = ConfigurationManager.AppSettings["EventLog"].ToString();
127 if( !(strEventLog==null) && !(strEventLog.Equals("")))
128 {
129 // 是否将日至写入事件查看器
130 if(strEventLog.ToLower().Equals("true"))
131 bStickInEventLog = true;
132 else
133 bStickInEventLog = false;
134 }//end if logfile
135
136 }//end SetupTracking()
137
138
139 /**//// <summary>
140 /// 写入跟踪信息到日至文件，
141 /// </summary>
142 /// <param name="sSwitchName">创建一个新的TraceSwitch</param>
143 /// <param name="when">要写入日至的级别</param>
144 /// <param name="strLogThis">要写入日至的具体信息</param>
145 /// <returns></returns>
146 public static void Log( string sSwitchName,
147 int when,
148 string strLogThis)
149 {
150 if(dSwitch == null) SetupTracing();
151
152 //指定自定义的日志权重处理级别
153 TraceSwitch ts = GetTraceSwitch(sSwitchName);
154 if (ts == null) ts = GetTraceSwitch("dSwitch");
155 int nSwLvl = (int) ts.Level;
156 if(when > nSwLvl) return; // 比预先设定级别重要的信息才会被写入
157
158 tlLog.WriteLine(String.Format("[{0}]\t[{1}]\t[{2}]", MyConvert(when), System.DateTime.Now.ToString(),
159 strLogThis));
160 tlLog.Flush();
161
162 if( (when == Logger.ERROR)
163 && bStickInEventLog)
164 {
165 if (!EventLog.SourceExists("RENHEOA"))
166 EventLog.CreateEventSource(
167 "RENHEOA", "Application");
168 // 写入日至到事件查看器
169 System.Diagnostics.EventLog el =
170 new EventLog("Application");
171 el.Source = "RENHEOA";
172 el.WriteEntry(strLogThis,
173 System.Diagnostics.EventLogEntryType.Error);
174 el.Close();
175 }
176 return;
177
178
179 }//end log(str,int,str)
180
181
182 /**//// <summary>
183 /// 写入跟踪信息到日至文件，
184 /// </summary>
185 /// <param name="when">要写入日至的级别</param>
186 /// <param name="strLogThis">要写入日至的具体信息</param>
187 /// <returns></returns>
188 public static void Log(int when, string strLogThis)
189 {
190 if(dSwitch == null) SetupTracing();
191
192 int nSwitchLevel = (int) dSwitch.Level;
193 if(when > nSwitchLevel) return;
194
195 tlLog.WriteLine(String.Format("[{0}]\t[{1}]\t[{2}]",MyConvert(when),System.DateTime.Now.ToString(),
196 strLogThis));
197 tlLog.Flush();
198
199 if ((when == Logger.ERROR)
200 && bStickInEventLog)
201 {
202 if (!EventLog.SourceExists("RENHEOA"))
203 EventLog.CreateEventSource("RENHEOA",
204 "Application");
205 // 写入日至到事件查看器
206 System.Diagnostics.EventLog el =
207 new EventLog("Application");
208 el.Source = "RENHEOA";
209 el.WriteEntry(strLogThis);
210 el.Close();
211 }//
212 return;
213