How to publish wmi classes in .net?

Question

I've created a seperate assembly with a class that is intended to be published through wmi. Then I've created a windows forms app that references that assembly and attempts to publish the class. When I try to publish the class, I get an exception of type System.Management.Instrumentation.WmiProviderInstallationException. The message of the exception says "Exception of type 'System.Management.Instrumentation.WMIInfraException' was thrown.". I have no idea what this means. I've tried .Net2.0 and .Net3.5 (sp1 too) and get the same results. Below is my wmi class, followed by the code I used to publish it. //Interface.cs in assembly WMI.Interface.dll using System; using System.Collections.Generic; using System.Text; [assembly: System.Management.Instrumentation.WmiConfiguration(@"root\Test", HostingModel = System.Management.Instrumentation.ManagementHostingModel.Decoupled)] namespace WMI { [System.ComponentModel.RunInstaller(true)] public class MyApplicationManagementInstaller : System.Management.Instrumentation.DefaultManagementInstaller { } [System.Management.Instrumentation.ManagementEntity(Singleton = true)] [System.Management.Instrumentation.ManagementQualifier("Description", Value = "Obtain processor information.")] public class Interface { [System.Management.Instrumentation.ManagementBind] public Interface() { } [System.Management.Instrumentation.ManagementProbe] [System.Management.Instrumentation.ManagementQualifier("Descriiption", Value="The number of processors.")] public int ProcessorCount { get { return Environment.ProcessorCount; } } } } //Button click in windows forms application to publish class try { System.Management.Instrumentation.InstrumentationManager.Publish(new WMI.Interface()); } catch (System.Management.Instrumentation.InstrumentationException exInstrumentation) { MessageBox.Show(exInstrumentation.ToString()); } catch (System.Management.Instrumentation.WmiProviderInstallationException exProvider) { MessageBox.Show(exProvider.ToString()); } catch (Exception exPublish) { MessageBox.Show(exPublish.ToString()); } JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

To summarize, this is the final code that works: Provider class, in it's own assembly: // the namespace used for publishing the WMI classes and object instances [assembly: Instrumented("root/mytest")] using System; using System.Collections.Generic; using System.Text; using System.Management; using System.Management.Instrumentation; using System.Configuration.Install; using System.ComponentModel; namespace WMITest { [InstrumentationClass(System.Management.Instrumentation.InstrumentationType.Instance)] //[ManagementEntity()] //[ManagementQualifier("Description",Value = "Obtain processor information.")] public class MyWMIInterface { //[System.Management.Instrumentation.ManagementBind] public MyWMIInterface() { } //[ManagementProbe] //[ManagementQualifier("Descriiption", Value="The number of processors.")] public int ProcessorCount { get { return Environment.ProcessorCount; } } } ///

/// This class provides static methods to publish messages to WMI ///

public static class InstrumentationProvider { ///

/// publishes a message to the WMI repository ///

/// the message text /// the message type public static MyWMIInterface Publish() { // create a new message MyWMIInterface pInterface = new MyWMIInterface(); Instrumentation.Publish(pInterface); return pInterface; } ///

/// revoke a previously published message from the WMI repository ///

/// the message to revoke public static void Revoke(MyWMIInterface pInterface) { Instrumentation.Revoke(pInterface); } } ///

/// Installer class which will publish the InfoMessage to the WMI schema /// (the assembly attribute Instrumented defines the namespace this /// class gets published too ///

[RunInstaller(true)] public class WMITestManagementInstaller : DefaultManagementProjectInstaller { } } Windows forms application main form, publishes provider class: using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Management; using System.Management.Instrumentation; namespace WMI { public partial class Form1 : Form { public Form1() { InitializeComponent(); } WMITest.MyWMIInterface pIntf_m; private void btnPublish_Click(object sender, EventArgs e) { try { pIntf_m = WMITest.InstrumentationProvider.Publish(); } catch (ManagementException exManagement) { MessageBox.Show(exManagement.ToString()); } catch (Exception exPublish) { MessageBox.Show(exPublish.ToString()); } } } } Test web application, consumer: using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Management.Instrumentation; using System.Management; public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { ManagementClass pWMIClass = null; pWMIClass = new ManagementClass(@"root\interiorhealth:MyWMIInterface"); lblOutput.Text = "ClassName: " + pWMIClass.ClassPath.ClassName + "
" + "IsClass: " + pWMIClass.ClassPath.IsClass + "
" + "IsInstance: " + pWMIClass.ClassPath.IsInstance + "
" + "IsSingleton: " + pWMIClass.ClassPath.IsSingleton + "
" + "Namespace Path: " + pWMIClass.ClassPath.NamespacePath + "
" + "Path: " + pWMIClass.ClassPath.Path + "
" + "Relative Path: " + pWMIClass.ClassPath.RelativePath + "
" + "Server: " + pWMIClass.ClassPath.Server + "
"; //GridView control this.gvProperties.DataSource = pWMIClass.Properties; this.gvProperties.DataBind(); //GridView control this.gvSystemProperties.DataSource = pWMIClass.SystemProperties; this.gvSystemProperties.DataBind(); //GridView control this.gvDerivation.DataSource = pWMIClass.Derivation; this.gvDerivation.DataBind(); //GridView control this.gvMethods.DataSource = pWMIClass.Methods; this.gvMethods.DataBind(); //GridView control this.gvQualifiers.DataSource = pWMIClass.Qualifiers; this.gvQualifiers.DataBind(); } } }