错误处理类

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Xml;
using System.Web.SessionState;
using System.Data;
using System.Configuration;
using System.Collections;

namespace ynet.cba.WebLogic.YongDian
...{
    public  class errorlog
    ...{
        private static errorlog _Instance = null;
        private static string strRootName;
        private static XmlElement xmlRoot;
        private static XmlDocument xmlDoc;
        private string errorfile = ((Hashtable)ConfigurationManager.GetSection("errorfile"))["setting1"].ToString();
       

        public  errorlog()
        ...{
            Load();
        }

        private bool Load()
        ...{   
           
            if (!File.Exists(errorfile))
                CreateErrorLogFile(errorfile);

            if (xmlDoc == null)
                xmlDoc = new XmlDocument();
            try
            ...{
                xmlDoc.Load(errorfile);
            }
            catch
            ...{
                return false;
            }
            xmlRoot = xmlDoc.DocumentElement;
            if (xmlRoot != null)
                strRootName = "/" + xmlRoot.Name + "/";
            return true;
        }

        private void CreateErrorLogFile(string strFileName)
        ...{
            StringBuilder sb = new StringBuilder();
            sb.Append("<?xml version='1.0' ?> ");
            sb.Append("<ERRORLOG>");
            sb.Append("</ERRORLOG>");

            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.LoadXml(sb.ToString());
            xmlDoc.Save(strFileName);
        }

        private void AddXmlAttribute(XmlElement xNode, string strAttr, string strAttrvalue)
        ...{
            XmlAttribute xAttr = (XmlAttribute)xmlDoc.CreateNode(XmlNodeType.Attribute, strAttr, null);
            xAttr.InnerText = strAttrvalue;
            xNode.Attributes.Append(xAttr);
        }

        public void SetErrorLog(ErrorLogItem errItem)
        ...{
            XmlElement xErrorElement = xmlDoc.CreateElement("error");

            AddXmlAttribute(xErrorElement, "username", errItem.User);
            AddXmlAttribute(xErrorElement, "application", errItem.AppName);
            AddXmlAttribute(xErrorElement, "classname", errItem.ClassName);
            AddXmlAttribute(xErrorElement, "functionname", errItem.FunctionName);
            AddXmlAttribute(xErrorElement, "position", errItem.Position);
            AddXmlAttribute(xErrorElement, "occurtime", errItem.OccurTime.ToString("g"));
            xErrorElement.InnerText = errItem.ErrorInfo;

            xmlRoot.AppendChild(xErrorElement);

            if (xmlRoot.ChildNodes.Count &gt; 1000)
                xmlRoot.RemoveChild(xmlRoot.FirstChild);
            xmlDoc.Save(errorfile);
        }

        public static errorlog Instance()
        ...{
            if(_Instance == null)
            ...{
             _Instance = new errorlog();
            }
            return _Instance ;
        }

        public static void LogAppError(string thisErr, string strClass, string strFunc, string strPos, string strUser)
        ...{
            ErrorLogItem errItem = new ErrorLogItem();

            errItem.AppName = "远能电力抄表管理系统";
            errItem.ClassName = strClass;
            errItem.ErrorInfo = thisErr;
            errItem.FunctionName = strFunc;
            errItem.OccurTime = DateTime.Now;
            errItem.Position = strPos;
            errItem.User = strUser;

            try
            ...{
                errorlog.Instance().SetErrorLog(errItem);
                //SendErrorLogMail(ErrorLogEmail, sb.ToString());
            }
            catch(Exception ee )
            ...{
                throw new Exception("An error occur :"+ ee.Message);
            }
            finally
            ...{

            }
           
        }

       
    }
    public struct ErrorLogItem
    ...{
        public string User;//当前登录人
        public string AppName;//应用程序名称
        public string ClassName;//错误发生的类名称
        public string FunctionName;//错误发生的方法（事件）名称
        public string Position;//错误的位置（或其它信息）
        public string ErrorInfo;//错误信息
        public DateTime OccurTime;//错误发生的时间
    }

    
}

在web.config中的配置

<?xml version="1.0" encoding="utf-8"?><CONFIGURATION>
  <CONFIGSECTIONS>
    <SECTION name="errorfile" type="System.Configuration.SingleTagSectionHandler" />
    <SECTIONGROUP name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
      <SECTIONGROUP name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
        <SECTION name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" allowDefinition="MachineToApplication" requirePermission="false" />
        <SECTIONGROUP name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
          <SECTION name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" allowDefinition="Everywhere" requirePermission="false" />
          <SECTION name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" allowDefinition="MachineToApplication" requirePermission="false" />
          <SECTION name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" allowDefinition="MachineToApplication" requirePermission="false" />
          
         
        </SECTIONGROUP>
      </SECTIONGROUP>
    </SECTIONGROUP>
  </CONFIGSECTIONS>
  <ERRORFILE setting1="C:errorlog.xml" />
  <CONNECTIONSTRINGS>
      <ADD name="ynetcbaConnectionString" providerName="System.Data.SqlClient" connectionString="Data Source=SoftDev;Initial Catalog=ynet.cba;Persist Security Info=True;User ID=sa;Password=8888" />
  </CONNECTIONSTRINGS>