.net中的Global的错误日志

void Application_Error(object sender, EventArgs e) 
{ 
// 在出现未处理的错误时运行的代码 
Exception ex = Server.GetLastError().GetBaseException(); 
StringBuilder str = new StringBuilder(); 
str.Append("\r\n" + DateTime.Now.ToString("yyyy.MM.dd HH:mm:ss")); 
str.Append("\r\n.客户信息："); 


string ip = ""; 
if (Request.ServerVariables.Get("HTTP_X_FORWARDED_FOR") != null) 
{ 
ip = Request.ServerVariables.Get("HTTP_X_FORWARDED_FOR").ToString().Trim(); 
} 
else 
{ 
ip = Request.ServerVariables.Get("Remote_Addr").ToString().Trim(); 
} 
str.Append("\r\n\tIp:" + ip); 
str.Append("\r\n\t浏览器:" + Request.Browser.Browser.ToString()); 
str.Append("\r\n\t浏览器版本:" + Request.Browser.MajorVersion.ToString()); 
str.Append("\r\n\t操作系统:" + Request.Browser.Platform.ToString()); 
str.Append("\r\n.错误信息："); 
str.Append("\r\n\t页面：" + Request.Url.ToString()); 
str.Append("\r\n\t错误信息：" + ex.Message); 
str.Append("\r\n\t错误源：" + ex.Source); 
str.Append("\r\n\t异常方法：" + ex.TargetSite); 
str.Append("\r\n\t堆栈信息：" + ex.StackTrace); 
str.Append("\r\n--------------------------------------------------------------------------------------------------"); 
//创建路径 
string upLoadPath = Server.MapPath("~/log/"); 
if (!System.IO.Directory.Exists(upLoadPath)) 
{ 
System.IO.Directory.CreateDirectory(upLoadPath); 
} 
//创建文件 写入错误 
System.IO.File.AppendAllText(upLoadPath + DateTime.Now.ToString("yyyy.MM.dd") + ".log", str.ToString(), System.Text.Encoding.UTF8); 
//处理完及时清理异常 
Server.ClearError(); 
//跳转至出错页面 
Response.Redirect("~/error.html"); 
}