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[英]How to write logs to EventLog by ILogger<T> in Asp.net Core?
[英]Write a caught ASP.NET exception to EventLog without losing detail
本文详细说明了如何将ASP.NET异常记录到Windows EventLog以及如何向最终用户显示自定义错误页面。
但是,ASP.NET Web应用程序的标准事件日志记录机制自动包含许多本文未显示的有用信息。 实施本文中的代码会导致我的错误事件丢失细节/粒度。
例如,使用自动未捕获的异常日志记录,您可以在标题下看到许多属性:事件信息,应用程序信息,进程信息,请求信息,线程信息,自定义事件详细信息。
如何实现对未捕获的异常中记录的所有相同信息的记录,并将我的自定义信息附加到“ 自定义事件详细信息”部分中? 最好的答案最好是使用System.Diagnostics
或System.Exception
或某些类似的内置方法,即编写尽可能少的代码以编写带有上述所有部分的日志条目,并将任何自定义详细信息附加到字符串中。
如果可能的话,我还想将唯一的哈希事件ID(例如下面的示例b68b3934cbb0427e9497de40663c5225
)返回给应用程序,以显示在ErrorPage.aspx
所需的日志格式示例:
Event code: 3005
Event message: An unhandled exception has occurred.
Event time: 15/07/2016 15:44:01
Event time (UTC): 15/07/2016 14:44:01
Event ID: b68b3934cbb0427e9497de40663c5225
Event sequence: 131
Event occurrence: 2
Event detail code: 0
Application information:
Application domain: /LM/W3SVC/3/ROOT-1-131130657267252632
Trust level: Full
Application Virtual Path: /
Application Path: C:\WWW\nobulus\nobulusPMM\Application\PMM\
Machine name: L-ADAM
Process information:
Process ID: 47216
Process name: iisexpress.exe
Account name: L-ADAM\Adam
Exception information:
Exception type: ApplicationException
Exception message: Error running stored procedure saveValidation: Procedure or function 'saveValidation' expects parameter '@ValidatedBy', which was not supplied.
at PMM.Models.PMM_DB.runStoredProcedure(String StoredProcedureName, List`1 SQLParameters) in C:\WWW\nobulus\nobulusPMM\Application\PMM\Models\PMM_DB.cs:line 104
at PMM.Models.PMM_DB.saveValidation(String PTLUniqueID, String ValidatedBy, DateTime ValidationDateTime, Nullable`1 ValidationCategoryID, String ValidationCategory, String Comment, Nullable`1 ClockStartDate, Nullable`1 ClockStopDate, String StartRTTStatus, String StopRTTStatus, String LastRTTStatus, Boolean MergedPathway, String MergedPathwayID, String ExtinctPathwayID, DataTable ChecklistResponses) in C:\WWW\nobulus\nobulusPMM\Application\PMM\Models\PMM_DB.cs:line 265
at PMM.Validate.lnkSaveButton_Click(Object sender, EventArgs e) in C:\WWW\nobulus\nobulusPMM\Application\PMM\Validate.aspx.cs:line 323
at System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e)
at System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument)
at System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
Request information:
Request URL: http://localhost:6901/Validate?PTLUniqueID=RTT10487
Request path: /Validate
User host address: ::1
User: L-ADAM\Adam
Is authenticated: True
Authentication Type: Negotiate
Thread account name: L-ADAM\Adam
Thread information:
Thread ID: 19
Thread account name: L-ADAM\Adam
Is impersonating: False
Stack trace: at PMM.Models.PMM_DB.runStoredProcedure(String StoredProcedureName, List`1 SQLParameters) in C:\WWW\nobulus\nobulusPMM\Application\PMM\Models\PMM_DB. cs:line 104
at PMM.Models.PMM_DB.saveValidation(String PTLUniqueID, String ValidatedBy, DateTime ValidationDateTime, Nullable`1 ValidationCategoryID, String ValidationCategory, String Comment, Nullable`1 ClockStartDate, Nullable`1 ClockStopDate, String StartRTTStatus, String StopRTTStatus, String LastRTTStatus, Boolean MergedPathway, String MergedPathwayID, String ExtinctPathwayID, DataTable ChecklistResponses) in C:\WWW\nobulus\nobulusPMM\Application\PMM\Models\PMM_DB.cs:line 265
at PMM.Validate.lnkSaveButton_Click(Object sender, EventArgs e) in C:\WWW\nobulus\nobulusPMM\Application\PMM\Validate.aspx.cs:line 323
at System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e)
at System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument)
at System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
Custom event details:
更新
我居然发现了使用ILSpy并在不同的框架类漫游ASP.NET内部使用WebErrorEvent ,其具有保护的方法来实现相同的行为。
解决方案1:
为此,只需创建一个继承WebErrorEvent
的类,然后重写其构造函数即可 :
public class CustomWebErrorEvent : WebErrorEvent
{
public CustomWebErrorEvent(string message, EventSource source, int eventCode, Exception ex) : base(message, source, eventCode, ex)
{
}
}
然后在Global.asax的错误管理方法中使用它:
protected void Application_Error(Object sender, EventArgs e)
{
// Log error to the Event Log
Exception myError = null;
if (HttpContext.Current.Server.GetLastError() != null)
{
var r = new CustomWebErrorEvent("error", null, 120, HttpContext.Current.Server.GetLastError());
}
}
我很确定,也可以重载ASPNET以仅直接引发自定义WebErrorEvent
,但是我还没有找到它。
我仍在尝试找出如何向事件中添加自定义信息的方法,因为Web托管的错误事件不会重写FormatFormatEventEventDetails方法。
解决方案2:
如果不能立即丢失添加自定义字段,则可以使用我编写的类似方法执行相同的输出:
// Log error to the Event Log
Exception myError = null;
if (HttpContext.Current.Server.GetLastError() != null)
{
var request = HttpContext.Current.Request;
myError = HttpContext.Current.Server.GetLastError();
var dateAsBytes = System.Text.Encoding.UTF8.GetBytes(DateTime.Now.ToString("G"));
var id = Convert.ToBase64String(System.Security.Cryptography.MD5.Create().ComputeHash(dateAsBytes));
// Event info:
var eventMessage = myError.Message;
var currentTime = DateTime.Now.ToString("G");
var currentTimeUTC = DateTime.UtcNow.ToString("G");
// Application info:
var appDomainName = AppDomain.CurrentDomain.FriendlyName;
var appDomainTrustLevel = (AppDomain.CurrentDomain.IsFullyTrusted) ? "Full" : "Partial";
var appVirtualPath = VirtualPathUtility.GetDirectory(request.Path);
var appPath = request.PhysicalApplicationPath;
var machineName = Environment.MachineName;
// Process info:
var process = Process.GetCurrentProcess();
var processId = process.Id;
var processName = process.ProcessName;
var user = System.Security.Principal.WindowsIdentity.GetCurrent().User;
var accountName = user.Translate(typeof(System.Security.Principal.NTAccount));
// Exception info:
var exceptionType = myError.GetType().FullName;
var exceptionMessage = myError.Message;
var exceptionStack = myError.StackTrace;
// Request info:
var url = request.Url.AbsoluteUri;
var urlPath = request.Url.PathAndQuery;
var remoteAddress = request.UserHostAddress;
var userName = System.Security.Principal.WindowsIdentity.GetCurrent().Name;
var isAuthenticated = HttpContext.Current.User.Identity.IsAuthenticated;
var authenticationType = System.Security.Principal.WindowsIdentity.GetCurrent().AuthenticationType;
// Thread info:
var impersonationLevel = System.Security.Principal.WindowsIdentity.GetCurrent().ImpersonationLevel;
var exceptionStack2 = myError.StackTrace;
// TODO: aggregate all info as string before writting to EventLog.
}
我发现使用现有的.NET Apis几乎可以从您的输出中获取所有必填字段,只是需要知道在EventLog中将其作为字符串进行聚合后再输出。
您可以看到我正在使用的某些对象(例如AppDomain.CurrentDomain
, HttpContext.Current.Request
或Process.GetCurrentProcess()
返回许多其他信息,如果需要,也可以将其添加到输出中。
当然,所有这些都可以用一种简化代码的方法来包装。
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