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List Services using C# Managementclass - WMI Example

Updated on June 14, 2016

1. Introduction

WMI is Windows Management Instrumentation and it will help dot net framework to retrieve the system information. WMI is a separate world of classes dealing with accessing the system resources. The WMI classes usually used for retrieving the system information. Making changes to system information is done rarely through the WMI interfaces. In this hub, we will look how do we create WMI instances. I am going to retrieve all the Services running in the system and will display those in the List item.

2. Create Window Based Application (Form Design)

The first step is creating the windows application. Follow the steps given below:

1) First, Create a New Visual C#, Windows Application Project named CreateInstance

2) Once the form is displayed, design it as shown below:

The sample Application
The sample Application | Source

1: Listbox control. Its Name property is set as ctrlLstBox

2: Button control. Its Name property is set as btnServices. Then Text property is set as Get Services.

3: Windows Form. Its Text property is set as Get WMI Instances


Once the designing is finished, the click event for the btnServices button is created. To create that event, in the design view double click the button Get Services.

3. Code Implementation

Double clicking the Get Services button will leave you in the below-given function. That function is actually the click event handler for the Get Services button.

private void btnServices_Click(object sender, EventArgs e)
{
}

We are going to write out the code for this handler function. So when a user clicks the button, the code written on the handler runs and displays the output in the ListBox control named ctrlLstBox.

Before we start our coding, we should include the required DLL reference to our CreateInsance project. To do this, Click the Project->Add Reference… menu item. From the displayed dialog (It may take a while to display the dialog), we should select the System.Management item and then click OK. To select the System.Management, make sure you are in the .Net tab. This is shown in the below picture:

Adding Project Reference
Adding Project Reference | Source

After adding this reference, our project has access to the functionality provided by the DotNet DLL, System.Management.dll. We can verify whether reference is successfully added to the project or not by checking the reference node from the project explorer as shown below:

Added Reference
Added Reference | Source

Once the reference is ready we start our coding.

1) The first step is adding the above-created reference to the Top of the file (After the existing the using statement). This will enable us accessing the class kept inside the System.Management namespace. This code is shown below:

//Sample 01: Required Name Space
using System.Management;

2) In the button click event handler, first, a “system.management.managementclass” is created. We passed Win32_Services to its constructor and doing so we get the Win32 Service class at runtime. From this class, we can get all the instances that belong to it. Below is the code that shows creating the ManagementClass class named service_class.

//Sample 02: Create Management Class
ManagementClass service_class = new ManagementClass("Win32_Service");

3) All the objects belonging to the Win32_Service is retrieved from the service_class instance that we created from the previous step of this coding. The call to the function GetInstances() will retrieve all the Services running in the in the system as ManagementObject Collection. This is shown in the below code:

//Sample 03: Get all the Objects of Win32_Service class. Each object
//           represent one service
ManagementObjectCollection Service_objects_collection = service_class.GetInstances();

4) Next, we get each instance of the class ManagementObject by iterating through the Service_objects_collection. The Foreach construct is used to do the iteration. Once we have the ManagementObject instance available inside the body of the Foreach loop, we are retrieving the name property of the instance and adding it to the Listbox Control. The code is shown below:

//Sample 04: Iterate through each service and display the name of the
//           service
foreach (ManagementObject service in Service_objects_collection)
{
    ctrlLstBox.Items.Add(service["Name"].ToString()); 
} 

The Screen shot after executing the Button click handler is shown below:

After Loading Services
After Loading Services | Source

The complete code in the File is shown below:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

//Sample 01: Required Name Space
using System.Management;

namespace CreateInstance
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnServices_Click(object sender, EventArgs e)
        {
            //Sample 02: Create Management Class
            ManagementClass service_class = new ManagementClass("Win32_Service");

            //Sample 03: Get all the Objects of Win32_Service class. Each object
            //           represent one service
            ManagementObjectCollection Service_objects_collection = service_class.GetInstances();

            //Sample 04: Iterate through each service and display the name of the
            //           service
            foreach (ManagementObject service in Service_objects_collection)
            {
                ctrlLstBox.Items.Add(service["Name"].ToString()); 
            }
        }
    }
}

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