Process.Exited Event

 

Occurs when a process exits.

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

Public Event Exited As EventHandler

The Exited event indicates that the associated process exited. This occurrence means either that the process terminated (aborted) or successfully closed. This event can occur only if the value of the EnableRaisingEvents property is true.

There are two ways of being notified when the associated process exits: synchronously and asynchronously. Synchronous notification means calling the WaitForExit method to block the current thread until the process exits. Asynchronous notification uses the Exited event, which allows the calling thread to continue execution in the meantime. In the latter case, EnableRaisingEvents must be set to true for the calling application to receive the Exited event.

When the operating system shuts down a process, it notifies all other processes that have registered handlers for the Exited event. At this time, the handle of the process that just exited can be used to access some properties such as ExitTime and HasExited that the operating system maintains until it releases that handle completely.

System_CAPS_noteNote

Even if you have a handle to an exited process, you cannot call Start again to reconnect to the same process. Calling Start automatically releases the associated process and connects to a process with the same file but an entirely new Handle.

For more information about the use of the Exited event in Windows Forms applications, see the SynchronizingObject property.

The following code example creates a process that prints a file. It raises the Exited event when the process exits because the EnableRaisingEvents property was set when the process was created. The Exited event handler displays process information.

Imports System
Imports System.Diagnostics
Imports System.Threading

Class PrintProcessClass

    Private WithEvents myProcess As New Process
    Private elapsedTime As Integer
    Private eventHandled As Boolean

    Public Event Exited As EventHandler

    ' Print a file with any known extension.
    Sub PrintDoc(ByVal fileName As String)

        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 ex As Exception
            Console.WriteLine("An error occurred trying to print ""{0}"":" & _
                vbCrLf & ex.Message, fileName)
            Return
        End Try

        ' Wait for Exited event, but not more than 30 seconds.
        Const SLEEP_AMOUNT As Integer = 100
        Do While Not eventHandled
            elapsedTime += SLEEP_AMOUNT
            If elapsedTime > 30000 Then
                Exit Do
            End If
            Thread.Sleep(SLEEP_AMOUNT)
        Loop
    End Sub

    ' Handle Exited event and display process information.
    Private Sub myProcess_Exited(ByVal sender As Object, _
            ByVal e As System.EventArgs) Handles myProcess.Exited

        eventHandled = True
        Console.WriteLine("Exit time:    {0}" & vbCrLf & _
            "Exit code:    {1}" & vbCrLf & "Elapsed time: {2}", _
            myProcess.ExitTime, myProcess.ExitCode, elapsedTime)
    End Sub

    Shared Sub Main(ByVal args() As String)

        ' Verify that an argument has been entered.
        If args.Length <= 0 Then
            Console.WriteLine("Enter a file name.")
            Return
        End If

        ' Create the process and print the document.
        Dim myPrintProcess As New PrintProcessClass
        myPrintProcess.PrintDoc(args(0))
    End Sub
End Class

LinkDemand

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

.NET Framework
Available since 1.1
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