How To: Call a Method Asynchronously
.NET Framework 2.0
You can asynchronously call a method using WMI in .NET Framework by passing in an instance of the ManagementOperationObserver class into the InvokeMethod method. By calling a method asynchronously, you can complete other tasks while the method is being called and executed. If you call the method semisynchronously, you must wait for the method to finish executing before you start any other tasks. For information on calling a method semisynchronously, see How To: Execute a Method.
Example
The following code calls a method asynchronously. The Win32_Process.Create method is called to create a new process for Calc.exe.
using System; using System.Management; public class InvokeMethodAsync { public InvokeMethodAsync() { // Get the object on which the method // will be invoked ManagementClass processClass = new ManagementClass("Win32_Process"); // Create a results and completion handler ManagementOperationObserver handler = new ManagementOperationObserver(); handler.Completed += new CompletedEventHandler(Completed); // Invoke method asynchronously ManagementBaseObject inParams = processClass.GetMethodParameters("Create"); inParams["CommandLine"] = "calc.exe"; processClass.InvokeMethod( handler, "Create", inParams, null); // Do something while method is executing while(!isComplete) { System.Threading.Thread.Sleep(1000); } } private bool isComplete = false; private ManagementBaseObject returnObject; // Delegate called when the method completes // and results are available private void NewObject(object sender, ObjectReadyEventArgs e) { Console.WriteLine("New Object arrived!"); returnObject = e.NewObject; } private void Completed(object sender, CompletedEventArgs e) { isComplete = true; } public static void Main() { InvokeMethodAsync wmiMethod = new InvokeMethodAsync(); } }
Compiling the Code
The example requires references to the System and System.Management namespaces.
