You can create an override for a property or configuration parameter for a discovery. A property override changes the default value of a discovery property, and a configuration override changes the default value of a custom configuration setting for a discovery. If you want to create an override for a discovery, use the Microsoft.EnterpriseManagement.Configuration.ManagementPackDiscoveryPropertyOverride or Microsoft.EnterpriseManagement.Configuration.ManagementPackDiscoveryConfigurationOverride class. These classes are derived from the Microsoft.EnterpriseManagement.Configuration.ManagementPackDiscoveryOverride class.

Only the Enabled property can be overridden for discoveries. To figure out which parameters can be overridden, you must look at the definition of the discovery in the Management Pack that defines the discovery. All the parameters that can be overridden are defined in the OverrideableParameters element of the discovery. You can also call the GetOverrideableParameters method to get the list of parameters programmatically.

The following example creates an override for the Enabled property of a discovery.

Visual Basic  Copy Code 
Imports System
Imports System.Collections.Generic
Imports System.Text
Imports Microsoft.EnterpriseManagement
Imports Microsoft.EnterpriseManagement.Administration
Imports Microsoft.EnterpriseManagement.Common
Imports Microsoft.EnterpriseManagement.Configuration
Imports Microsoft.EnterpriseManagement.Monitoring


Namespace SDKSamples
	Class Program
		Public Overloads Shared Function Main(ByVal args() As String) As Integer

			Dim mg As ManagementGroup
			Dim mp As ManagementPack
			Dim monitoringClass As MonitoringClass
			Dim classCriteria As MonitoringClassCriteria
			Dim discoveryCriteria As MonitoringDiscoveryCriteria
			Dim discovery As MonitoringDiscovery
			Dim discoveryOverride As ManagementPackDiscoveryPropertyOverride

			mg = New ManagementGroup("localhost")

			mp = mg.GetManagementPacks("OverrideTestMP")(0)

			classCriteria = New MonitoringClassCriteria("Name='Microsoft.SQLServer.2005.DBEngine'")

			monitoringClass = mg.GetMonitoringClasses(classCriteria)(0)

			discoveryCriteria = New MonitoringDiscoveryCriteria( _
				"Name='Microsoft.SQLServer.2005.DatabaseDiscoveryRule'")

			discovery = mg.GetMonitoringDiscoveries(discoveryCriteria)(0)

			discoveryOverride = New ManagementPackDiscoveryPropertyOverride(mp, _
				"SampleDiscoveryOverride")

			discoveryOverride.Discovery = discovery
			discoveryOverride.Property = ManagementPackWorkflowProperty.Enabled
			discoveryOverride.Value = "false"
			discoveryOverride.Context = monitoringClass
			discoveryOverride.DisplayName = "SampleDiscoveryOverride"

			mp.Verify()

			' Save the changes into the management pack.
			mp.AcceptChanges()

		End Function
	End Class
End Namespace
C#  Copy Code 
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Text;
using Microsoft.EnterpriseManagement;
using Microsoft.EnterpriseManagement.Administration;
using Microsoft.EnterpriseManagement.Common;
using Microsoft.EnterpriseManagement.Configuration;
using Microsoft.EnterpriseManagement.Monitoring;

namespace SDKSamples
{
	class Program
	{
		//---------------------------------------------------------------------
		static void Main(string[] args)
		{
			ManagementGroup							 mg;
			ManagementPack							mp;
			MonitoringClassCriteria					 classCriteria;
			MonitoringClass							 monitoringClass;
			MonitoringDiscoveryCriteria				 discoveryCriteria;
			MonitoringDiscovery						 discovery;
			ManagementPackDiscoveryPropertyOverride	 discoveryOverride;

			mg = new ManagementGroup("localhost");

			mp = mg.GetManagementPacks("OverrideTestMP")[0];

			classCriteria = new MonitoringClassCriteria("Name='Microsoft.SQLServer.2005.DBEngine'");

			monitoringClass = mg.GetMonitoringClasses(classCriteria)[0];

			discoveryCriteria = new MonitoringDiscoveryCriteria("Name='Microsoft.SQLServer.2005.DatabaseDiscoveryRule'");

			discovery = mg.GetMonitoringDiscoveries(discoveryCriteria)[0];

			discoveryOverride = new ManagementPackDiscoveryPropertyOverride(mp, "SampleDiscoveryOverride");

			discoveryOverride.Discovery	 = discovery;
			discoveryOverride.Property	= ManagementPackWorkflowProperty.Enabled;
			discoveryOverride.Value		 = "false";
			discoveryOverride.Context	 = monitoringClass;
			discoveryOverride.DisplayName   = "SampleDiscoveryOverride";

			mp.Verify();
		
			//Save the changes into the management pack.
			mp.AcceptChanges();
	}	
}
}
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