Export (0) Print
Expand All

Process.EnableRaisingEvents Property

Gets or sets whether the Exited event should be raised when the process terminates.

Namespace: System.Diagnostics
Assembly: System (in system.dll)

public bool EnableRaisingEvents { get; set; }
/** @property */
public boolean get_EnableRaisingEvents ()

/** @property */
public void set_EnableRaisingEvents (boolean value)

public function get EnableRaisingEvents () : boolean

public function set EnableRaisingEvents (value : boolean)

Not applicable.

Property Value

true if the Exited event should be raised when the associated process is terminated (through either an exit or a call to Kill); otherwise, false. The default is false.

The EnableRaisingEvents property indicates whether the component should be notified when the operating system has shut down a process. The EnableRaisingEvents property is used in asynchronous processing to notify your application that a process has exited. To force your application to synchronously wait for an exit event (which interrupts processing of the application until the exit event has occurred), use the WaitForExit method.

NoteNote:

If you are using Visual Studio and double-click a Process component in your project, an Exited event delegate and event handler are automatically generated. Additional code sets the EnableRaisingEvents property to false. You must change this property to true for your event handler to be executed when the associated process exits.

When an associated process exits after being shut down by the operation system either through a normal or abnormal termination, the operating system notifies each process component to which the process was associated, as long as the component's EnableRaisingEvents value is true. If a component started the process, the component can then access the administrative information for the associated process, which is still being stored by the operating system. Such information includes the ExitTime, and the ExitCode.

After the associated process exits, the Handle of the component no longer points to an existing process resource. Instead, it can be used only to access the operating system's information about the process resource. The operating system is aware that there are handles to exited processes that have not been released by Process components, so it keeps the ExitTime and Handle information in memory.

There is a cost associated with watching for a process to exit. If EnableRaisingEvents is true, the Exited event is raised when the associated process terminates. The procedures that you have specified for the Exited event run at that time.

Sometimes, your application starts a process but does not need to be notified of its closure. For example, your application can start Notepad to allow the user to perform text editing, but make no further use of the Notepad application. You can choose to not be notified when the process exits, because it is not relevant to the continued operation of your application. Setting EnableRaisingEvents to false saves system resources.

The following code example creates a process that prints a file. It sets the EnableRaisingEvents property to cause the process to raise the Exited event when it exits. The Exited event handler displays process information.

using System;
using System.Diagnostics;
using System.ComponentModel;
using System.Threading;
using Microsoft.VisualBasic;

class PrintProcessClass
{

    private Process myProcess = new Process();
    private int elapsedTime;
    private bool eventHandled;

    // Print a file with any known extension.
    public void PrintDoc(string fileName)
    {

        elapsedTime = 0;
        eventHandled = false;

        try
        {
            // Start a process to print a file and raise an event when done.
            myProcess.StartInfo.FileName = fileName;
            myProcess.StartInfo.Verb = "Print";
            myProcess.StartInfo.CreateNoWindow = true;
            myProcess.EnableRaisingEvents = true;
            myProcess.Start();

        }
        catch (Exception ex)
        {
            Console.WriteLine("An error occurred trying to print \"{0}\":" + "\n" + ex.Message, fileName);
            return;
        }

        // Wait for Exited event, but not more than 30 seconds.
        const int SLEEP_AMOUNT = 100;
        while (!eventHandled)
        {
            elapsedTime += SLEEP_AMOUNT;
            if (elapsedTime > 30000)
            {
                break;
            }
            Thread.Sleep(SLEEP_AMOUNT);
        }
    }

    // Handle Exited event and display process information.
    private void myProcess_Exited(object sender, System.EventArgs e)
    {

        eventHandled = true;
        Console.WriteLine("Exit time:    {0}\r\n" +
            "Exit code:    {1}\r\nElapsed time: {2}", myProcess.ExitTime, myProcess.ExitCode, elapsedTime);
    }

    public static void Main(string[] args)
    {

        // Verify that an argument has been entered.
        if (args.Length <= 0)
        {
            Console.WriteLine("Enter a file name.");
            return;
        }

        // Create the process and print the document.
        PrintProcessClass myProcess = new PrintProcessClass();
        myProcess.PrintDoc(args[0]);
    }
}

  • LinkDemand  for full trust for the immediate caller. This member cannot be used by partially trusted code.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0

Community Additions

ADD
Show:
© 2014 Microsoft