WebApplicationInformation Class

Provides information associated with health events.

Namespace: System.Web.Management
Assembly: System.Web (in system.web.dll)

Public NotInheritable Class WebApplicationInformation
Dim instance As WebApplicationInformation

public final class WebApplicationInformation
public final class WebApplicationInformation
Not applicable.

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.

  enabled="true" heartBeatInterval="0">

       name="All Errors Default"
       eventName="All Errors"
       minInterval="00:01:00" />


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.

  enabled="true" heartBeatInterval="0">

    <add name="SampleApplicationInformation" 
        type="SamplesAspNet.SampleWebApplicationInformation, webapplicationinformation, Version=1.0.1585.27289, Culture=neutral, PublicKeyToken=3648e5c763a8239f, processorArchitecture=MSIL"/> 

    <add name="Custom Application Information"

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.
    End Sub 'Raise

    Public Function GetApplicationDomain() As String
        ' Get the name of the application domain.
        Return String.Format( _
        "Application domain: {0}", _
    End Function 'GetApplicationDomain

    Public Function GetApplicationPath() As String
        ' Get the name of the application  path.
        Return String.Format( _
        "Application path: {0}", _
    End Function 'GetApplicationPath

    Public Function GetApplicationVirtualPath() As String
        ' Get the name of the application virtual path.
        Return String.Format( _
        "Application virtual path: {0}", _
    End Function 'GetApplicationVirtualPath

    Public Function GetApplicationMachineName() As String
        ' Get the name of the application machine name.
        Return String.Format( _
        "Application machine name: {0}", _
    End Function 'GetApplicationMachineName

    Public Function GetApplicationTrustLevel() As String
        ' Get the name of the application trust level.
        Return String.Format( _
        "Application trust level: {0}", _
    End Function 'GetApplicationTrustLevel

    'Formats Web request event information.
    Public Overrides Sub FormatCustomEventDetails( _
     ByVal formatter As WebEventFormatter)

        ' Add custom data.
        formatter.AppendLine( _
        "Custom Application Information:")
        formatter.IndentationLevel += 1

        ' Display the application information.
        formatter.IndentationLevel -= 1
    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.


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0