qr code generator asp net c# Retrieve Information about Services that Are Paused in C#.NET

Paint QR-Code in C#.NET Retrieve Information about Services that Are Paused

Retrieve Information about Services that Are Paused
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Retrieving information about Windows Services is just as straightforward as retrieving information about other resources. Just do the following: 1. Create a new ManagementObjectSearcher object.
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Instrumentation
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2. Specify a query for it. 3. Call the Get method of the ManagementObjectSearcher (in the System.Management namespace). Here is an example:
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' VB Private Sub ListPausedServices() Dim DemoSearcher As New ManagementObjectSearcher("SELECT * FROM Win32_Service WHERE Started = FALSE") Dim AllObjects As ManagementObjectCollection = DemoSearcher.Get For Each PausedService As ManagementObject In AllObjects Console.WriteLine("Service = " + PausedService("Caption")) Next End Sub // C# private static void ListPausedServices() { ManagementObjectSearcher DemoSearcher = new ManagementObjectSearcher("SELECT * FROM Win32_Service WHERE Started = FALSE"); ManagementObjectCollection AllObjects = DemoSearcher.Get(); foreach (ManagementObject PausedService in AllObjects) { Console.WriteLine("Service = " + PausedService["Caption"]); } }
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Subscribe to Management Events Using the ManagementEventWatcher Class
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The ManagementEventWatcher class allows for subscription information about events that occur within the WMI context. To use it, perform the following steps: 1. Create a new ManagementEventWatcher object. 2. Associate an EventQuery object with it. 3. Call the WaitForNextEvent method. 4. Stop the notifications. Here is an example:
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' VB Public Sub QueryServices() Dim DemoQuery As New EventQuery DemoQuery.QueryString = "SELECT * FROM __InstanceCreationEvent WITHIN 1 WHERE TargetInstance isa ""Win32_Service"" AND TargetInstance.State = 'Paused'" Dim DemoWatcher As New ManagementEventWatcher(DemoQuery) DemoWatcher.Options.Timeout = New TimeSpan(0, 0, 20) Console.WriteLine( _ "Open an application to trigger WaitForNextEvent")
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Lesson 4: Detecting Management Events
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Dim e As ManagementBaseObject = DemoWatcher.WaitForNextEvent() DemoWatcher.Stop() End Sub // C# public static void QueryServices() { EventQuery DemoQuery = new EventQuery(); DemoQuery.QueryString = "SELECT * FROM __InstanceCreationEvent WITHIN 2 WHERE TargetInstance isa \"Win32_Service\" AND TargetInstance.State = 'Paused'"; ManagementEventWatcher DemoWatcher = new ManagementEventWatcher(DemoQuery); DemoWatcher.Options.Timeout = new TimeSpan(0, 0, 10); Console.WriteLine("Open an application to trigger WaitForNextEvent"); ManagementBaseObject Event = DemoWatcher.WaitForNextEvent(); DemoWatcher.Stop(); }
Lab: Write a Management Event to a Log
In this lab, you create an application that writes a management event to a log. If you encounter a problem completing an exercise, the completed projects are available on the companion CD in the Code folder. 1. Open Visual Studio 2005. 2. Select File, New, Project, Visual C#/ Visual Basic .NET, Windows, and then Console Application. 3. Type PerformanceCounterDemo in the Name text box, and click OK. 4. Select the Program.cs file in Visual C# or Module1.vb in Visual Basic. 5. Add the following code to the top of the Program.cs file or Module1.vb file:
'VB Imports System.Diagnostics Imports System.Management //C# Using System.Diagnostics; Imports System.Management;
Note that you will also need to add an assembly reference to System.Management. 6. In Module1.vb or Program.cs, create a new method named WriteToEventLog and insert the following code:
'VB Public Sub WriteToEventLog()
10
Instrumentation
Dim DemoQuery As New WqlEventQuery("__InstanceCreationEvent", New TimeSpan(0, 0, 1), "TargetInstance isa ""Win32_Process""") Dim DemoWatcher As New ManagementEventWatcher() DemoWatcher.Query = DemoQuery DemoWatcher.Options.Timeout = New TimeSpan(0, 0, 30) Console.WriteLine("Open an application to trigger an event.") Dim e As ManagementBaseObject = DemoWatcher.WaitForNextEvent() Dim DemoLog As New EventLog("Chap10Demo") DemoLog.Source = "Chap10Demo" Dim EventName As String = CType(e("TargetInstance"), ManagementBaseObject)("Name") Console.WriteLine(EventName) DemoLog.WriteEntry(EventName, EventLogEntryType.Information) DemoWatcher.Stop() End Sub //C# public static void WriteToEventLog() { WqlEventQuery DemoQuery = new WqlEventQuery("__InstanceCreationEvent", new TimeSpan(0, 0, 1), "TargetInstance isa \"Win32_Process\""); ManagementEventWatcher DemoWatcher = new ManagementEventWatcher(); DemoWatcher.Query = DemoQuery; DemoWatcher.Options.Timeout = new TimeSpan(0, 0, 30); Console.WriteLine( "Open an application to trigger an event."); ManagementBaseObject e = DemoWatcher.WaitForNextEvent(); EventLog DemoLog = new EventLog("Chap10Demo"); DemoLog.Source = "Chap10Demo"; String EventName = ((ManagementBaseObject)e["TargetInstance"]) ["Name"].ToString(); Console.WriteLine(EventName); DemoLog.WriteEntry(EventName, EventLogEntryType.Information); DemoWatcher.Stop(); }
7. Call the WriteToEventLog from Main:
'VB Sub Main() WriteToEventLog() Console.ReadLine() End Sub
Lesson 4: Detecting Management Events
//C# static void Main(string[] args) { WriteToEventLog(); Console.ReadLine(); }
8. Compile the application and run it. You will be prompted to open an application (for instance, notepad.exe). You should see the name of the application written out to the console window and written to an event log named 10Demo .
Lesson Summary
WMI is a component of the Windows operating system that provides monitoring functionality that spans virtually every machine resource. The EventQuery class is used within the .NET Framework to represent a WMI query. The Win32_Service object can be used to query information about Windows services. The ManagementQuery base class is used as a foundation for all management query objects. The ManagementObjectSearcher is used to query system resources through WMI.
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