C# 异常日志记录

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;

namespace HanXingExam.Common
{
public class ErrorLog
{
public static void WriteLog(Exception ex)
{
string errorTime = "异常时间：" + DateTime.Now.ToString();
string errorAddress = "异常地址：" + HttpContext.Current.Request.Url.ToString();
string errorInfo = "异常信息：" + ex.Message;
string errorSource = "错误源：" + ex.Source;
string errorType = "运行类型：" + ex.GetType();
string errorFunction = "异常函数：" + ex.TargetSite;
string errorTrace = "堆栈信息：" + ex.StackTrace;
HttpContext.Current.Server.ClearError();
System.IO.StreamWriter writer = null;
try
{

//写入日志
string path = string.Empty;
path = HttpContext.Current.Server.MapPath("~/ErrorLogs/");
//不存在则创建错误日志文件夹
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
path += string.Format(@"{0}.txt", DateTime.Now.ToString("yyyy-MM-dd"));

writer = !System.IO.File.Exists(path) ? System.IO.File.CreateText(path) : System.IO.File.AppendText(path); //判断文件是否存在，如果不存在则创建，存在则添加
writer.WriteLine("用户IP:" + HttpContext.Current.Request.UserHostAddress);
writer.WriteLine(errorTime);
writer.WriteLine(errorAddress);
writer.WriteLine(errorInfo);
writer.WriteLine(errorSource);
writer.WriteLine(errorType);
writer.WriteLine(errorFunction);
writer.WriteLine(errorTrace);
writer.WriteLine("********************************************************************************************");
}
finally
{
if (writer != null)
{
writer.Close();
}
}
}
}
}