WebApplicationInformation Class
Provides information associated with health events.
Assembly: System.Web (in System.Web.dll)
'Declaration <AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level := AspNetHostingPermissionLevel.Minimal)> _ <AspNetHostingPermissionAttribute(SecurityAction.InheritanceDemand, Level := AspNetHostingPermissionLevel.Minimal)> _ Public NotInheritable Class WebApplicationInformation 'Usage Dim instance As WebApplicationInformation
ASP.NET health monitoring allows production and operations staff to manage deployed Web applications. The System.Web.Management namespace contains the health-event types responsible for packaging application health-status data and the provider types responsible for processing this data. It also contains supporting types that help during the management of health events.
Instances of the WebApplicationInformation class contain information that is obtained using any of the types derived from the WebManagementEvent type.
Your application needs the appropriate permissions to access protected information provided by this type.
The following is an excerpt of a configuration file you could use to enable ASP.NET to log error events that contain application information.
<healthMonitoring
enabled="true" heartBeatInterval="0">
<rules>
<add
name="All Errors Default"
eventName="All Errors"
provider="EventLogProvider"
profile="Default"
minInterval="00:01:00" />
</rules>
</healthMonitoring>
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In most cases you will be able to use the ASP.NET health-monitoring types as implemented, and you will control the health-monitoring system by specifying values in the healthMonitoring configuration section. You can also derive from the health-monitoring types to create your own custom events and providers. For an example of creating a custom event class, see the example provided in this topic. |
The following code example has two parts. The first part is an excerpt of the configuration file that enables ASP.NET to use a custom event. The second shows how to create that custom event by using the WebApplicationInformation class.
Ensure that your custom event is raised at the proper time, that is, when the equivalent system health event it replaces would be raised.
<healthMonitoring
enabled="true" heartBeatInterval="0">
<eventMappings>
<add name="SampleApplicationInformation"
type="SamplesAspNet.SampleWebApplicationInformation, webapplicationinformation, Version=1.0.1585.27289, Culture=neutral, PublicKeyToken=3648e5c763a8239f, processorArchitecture=MSIL"/>
</eventMappings>
<rules>
<add name="Custom Application Information"
eventName="SampleApplicationInformation"
provider="EventLogProvider"
profile="Default"/>
</rules>
</healthMonitoring>
Imports System Imports System.Text Imports System.Web Imports System.Web.Management 'Implements a custom WebBaseEvent that uses ' WebApplicationInformation. Public Class SampleWebApplicationInformation Inherits WebBaseEvent Private eventInfo As StringBuilder ' Instantiate SampleWebGet Public Sub New(ByVal msg As String, _ ByVal eventSource As Object, _ ByVal eventCode As Integer) MyBase.New(msg, eventSource, eventCode) ' Perform custom initialization. eventInfo = New StringBuilder() eventInfo.Append(String.Format( _ "Event created at: {0}", EventTime.ToString())) End Sub 'New ' Raises the event. Public Overrides Sub Raise() ' Perform custom processing. eventInfo.Append(String.Format( _ "Event raised at: {0}", EventTime.ToString())) ' Raise the event. MyBase.Raise() End Sub 'Raise Public Function GetApplicationDomain() As String ' Get the name of the application domain. Return String.Format( _ "Application domain: {0}", _ ApplicationInformation.ApplicationDomain) End Function 'GetApplicationDomain Public Function GetApplicationPath() As String ' Get the name of the application path. Return String.Format( _ "Application path: {0}", _ ApplicationInformation.ApplicationPath()) End Function 'GetApplicationPath Public Function GetApplicationVirtualPath() As String ' Get the name of the application virtual path. Return String.Format( _ "Application virtual path: {0}", _ ApplicationInformation.ApplicationVirtualPath()) End Function 'GetApplicationVirtualPath Public Function GetApplicationMachineName() As String ' Get the name of the application machine name. Return String.Format( _ "Application machine name: {0}", _ ApplicationInformation.MachineName()) End Function 'GetApplicationMachineName Public Function GetApplicationTrustLevel() As String ' Get the name of the application trust level. Return String.Format( _ "Application trust level: {0}", _ ApplicationInformation.TrustLevel()) End Function 'GetApplicationTrustLevel 'Formats Web request event information. Public Overrides Sub FormatCustomEventDetails( _ _ ByVal formatter As WebEventFormatter) MyBase.FormatCustomEventDetails(formatter) ' Add custom data. formatter.AppendLine( _ "Custom Application Information:") formatter.IndentationLevel += 1 ' Display the application information. formatter.AppendLine(GetApplicationDomain()) formatter.AppendLine(GetApplicationPath()) formatter.AppendLine(GetApplicationVirtualPath()) formatter.AppendLine(GetApplicationMachineName()) formatter.AppendLine(GetApplicationTrustLevel()) formatter.IndentationLevel -= 1 formatter.AppendLine(eventInfo.ToString()) End Sub 'FormatCustomEventDetails End Class 'SampleWebApplicationInformation
- InheritanceDemand
The derived class inheriting the class or overriding a method is required to have been granted the specified permission.
- LinkDemand
The immediate caller is required to have been granted the specified permission.
For more information on declarative security and link demands, see Declarative Security Used with Class and Member Scope.
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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