LogHelper 的摘要说明(写入日志)

public static class LogHelper
{
    public static string path = string.Empty;

    public static void WriteLog(Exception ex,HttpRequest Request)
    {
        Exception objErr = ex;
        string error = string.Empty;
        string errortime = string.Empty;
        string erroraddr = string.Empty;
        string errorinfo = string.Empty;
        string errorsource = string.Empty;
        string errortrace = string.Empty;

        error += "发生时间:" + System.DateTime.Now.ToString() + "<br>";
        errortime = "发生时间:" + System.DateTime.Now.ToString();

        error += "发生异常页: " + Request.Url.ToString() + "<br>";
        erroraddr = "发生异常页: " + Request.Url.ToString();

        error += "异常信息: " + objErr.Message + "<br>";
        errorinfo = "异常信息: " + objErr.Message;

        //error +="错误源:"+objErr.Source+"<br>";
        //error += "堆栈信息:" + objErr.StackTrace + "<br>";
        errorsource = "错误源:" + objErr.Source;
        errortrace = "堆栈信息:" + objErr.StackTrace;
        error += "--------------------------------------<br>";     

        //独占方式，因为文件只能由一个进程写入.
        System.IO.StreamWriter writer = null;
        try
        {
            string str = "";
            lock (str)
            {
                // 写入日志
                string year = DateTime.Now.Year.ToString();
                string month = DateTime.Now.Month.ToString();
                string path = LogHelper.path;
                string filename = DateTime.Now.Day.ToString() + ".txt";               
                //如果目录不存在则创建
                if (!System.IO.Directory.Exists(path))
                {
                    System.IO.Directory.CreateDirectory(path);
                }
                System.IO.FileInfo file = new System.IO.FileInfo(path + "/" + filename);
                writer = new System.IO.StreamWriter(file.FullName, true);//文件不存在就创建,true表示追加
                writer.WriteLine("用户IP:" + Request.UserHostAddress);
             
                writer.WriteLine(errortime);
                writer.WriteLine(erroraddr);
                writer.WriteLine(errorinfo);
                writer.WriteLine(errorsource);
                writer.WriteLine(errortrace);
                writer.WriteLine("--------------------------------------------------------------------------------------");
            }
        }
        finally
        {
            if (writer != null)
                writer.Close();
        }
    }
}

Global.asax的void Application_Error(object sender, EventArgs e) 中写入

 //在出现未处理的错误时运行的代码
        Exception objErr = Server.GetLastError().GetBaseException();
        string error = string.Empty;
        string errortime = string.Empty;
        string erroraddr = string.Empty;
        string errorinfo = string.Empty;
        string errorsource = string.Empty;
        string errortrace = string.Empty;

        error += "发生时间:" + System.DateTime.Now.ToString() + "<br>";
        errortime = "发生时间:" + System.DateTime.Now.ToString();

        error += "发生异常页: " + Request.Url.ToString() + "<br>";
        erroraddr = "发生异常页: " + Request.Url.ToString();

        error += "异常信息: " + objErr.Message + "<br>";
        errorinfo = "异常信息: " + objErr.Message;

        //error +="错误源:"+objErr.Source+"<br>";
        //error += "堆栈信息:" + objErr.StackTrace + "<br>";
        errorsource = "错误源:" + objErr.Source;
        errortrace = "堆栈信息:" + objErr.StackTrace;
        error += "--------------------------------------<br>";
        Server.ClearError();
        Application["error"] = error;

        //独占方式，因为文件只能由一个进程写入.
        System.IO.StreamWriter writer = null;
        try
        {
            lock (this)
            {
                // 写入日志
                string year = DateTime.Now.Year.ToString();
                string month = DateTime.Now.Month.ToString();
                string path = string.Empty;
                string filename = DateTime.Now.Day.ToString() + ".txt";
                path = Server.MapPath("~/Logs/") + year + "/" + month;
                //如果目录不存在则创建
                if (!System.IO.Directory.Exists(path))
                {
                    System.IO.Directory.CreateDirectory(path);
                }
                System.IO.FileInfo file = new System.IO.FileInfo(path + "/" + filename);
                writer = new System.IO.StreamWriter(file.FullName, true);//文件不存在就创建,true表示追加
                writer.WriteLine("用户IP:" + Request.UserHostAddress);
                if (Session["Loginuser"] != null)
                {
                    writer.WriteLine("用户名" + System.Web.HttpContext.Current.Session["UserName"].ToString());
                }
                writer.WriteLine(errortime);
                writer.WriteLine(erroraddr);
                writer.WriteLine(errorinfo);
                writer.WriteLine(errorsource);
                writer.WriteLine(errortrace);
                writer.WriteLine("--------------------------------------------------------------------------------------");
            }
        }
        finally
        {
            if (writer != null)
                writer.Close();
        }

web.config中写

<!--异常处理配置-->
  <exceptionHandling>
    <exceptionPolicies>
      <add name="Log Only Policy">
        <exceptionTypes>
          <add name="Exception" type="System.Exception, mscorlib" postHandlingAction="None">
            <exceptionHandlers>
              <add logCategory="Default Category" eventId="100" severity="Error" title="UI Application Exception Handling" priority="0" formatterType="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.TextExceptionFormatter, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling" name="Logging Handler" type="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Logging.LoggingExceptionHandler, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Logging" />
            </exceptionHandlers>
          </add>
        </exceptionTypes>
      </add>
    </exceptionPolicies>
  </exceptionHandling>