Process.Exited Händelse

public:
 event EventHandler ^ Exited;

public event EventHandler Exited;

member this.Exited : EventHandler 

Public Custom Event Exited As EventHandler 

Händelsetyp

Exempel

I följande kodexempel skapas en process som skriver ut en fil. Händelsen genereras Exited när processen avslutas eftersom EnableRaisingEvents egenskapen angavs när processen skapades. Händelsehanteraren Exited visar processinformation.

using System;
using System.Diagnostics;
using System.Threading.Tasks;

class PrintProcessClass
{
    private Process myProcess;
    private TaskCompletionSource<bool> eventHandled;

    // Print a file with any known extension.
    public async Task PrintDoc(string fileName)
    {
        eventHandled = new TaskCompletionSource<bool>();

        using (myProcess = new Process())
        {
            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.Exited += new EventHandler(myProcess_Exited);
                myProcess.Start();
            }
            catch (Exception ex)
            {
                Console.WriteLine($"An error occurred trying to print \"{fileName}\":\n{ex.Message}");
                return;
            }

            // Wait for Exited event, but not more than 30 seconds.
            await Task.WhenAny(eventHandled.Task,Task.Delay(30000));
        }
    }

    // Handle Exited event and display process information.
    private void myProcess_Exited(object sender, System.EventArgs e)
    {
        Console.WriteLine(
            $"Exit time    : {myProcess.ExitTime}\n" +
            $"Exit code    : {myProcess.ExitCode}\n" +
            $"Elapsed time : {Math.Round((myProcess.ExitTime - myProcess.StartTime).TotalMilliseconds)}");
        eventHandled.TrySetResult(true);
    }

    public static async Task 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 myPrintProcess = new PrintProcessClass();
        await myPrintProcess.PrintDoc(args[0]);
    }
}

open System
open System.Diagnostics
open System.Threading.Tasks

let mutable myProcess = new Process()
let mutable eventHandled = TaskCompletionSource<bool>()

// Handle Exited event and display process information.
let myProcess_Exited (sender: obj) (e: EventArgs) =
    printfn $"Exit time    : {myProcess.ExitTime}\n"
    printfn $"Exit code    : {myProcess.ExitCode}\n"
    printfn $"Elapsed time : {round ((myProcess.ExitTime - myProcess.StartTime).TotalMilliseconds)}"
    eventHandled.TrySetResult true |> ignore

// Print a file with any known extension.
let printDoc fileName =
    task {
        eventHandled <- TaskCompletionSource<bool>()

        use myProcess = new Process()

        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.Exited.AddHandler(EventHandler myProcess_Exited)
            myProcess.Start() |> ignore
        with ex ->
            printfn $"An error occurred trying to print \"{fileName}\":\n{ex.Message}"

        // Wait for Exited event, but not more than 30 seconds.
        let! _ = Task.WhenAny(eventHandled.Task, Task.Delay(30000))
        ()
    }

[<EntryPoint>]
let main args =
    // Verify that an argument has been entered.
    if args.Length <= 0 then
        printfn "Enter a file name."
    else
        // Create the process and print the document.
        printDoc(args[0]).Wait() |> ignore

    0

Imports System.Diagnostics

Class PrintProcessClass

    Private WithEvents myProcess As Process
    Private eventHandled As TaskCompletionSource(Of Boolean)

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

        eventHandled = New TaskCompletionSource(Of Boolean)()
        myProcess = New Process
        Using myProcess
            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
                AddHandler myProcess.Exited, New EventHandler(AddressOf myProcess_Exited)
                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.
            Await Task.WhenAny(eventHandled.Task, Task.Delay(30000))
        End Using
    End Function

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

        Console.WriteLine("Exit time:    {0}" & vbCrLf &
            "Exit code:    {1}" & vbCrLf & "Elapsed time: {2}",
            myProcess.ExitTime, myProcess.ExitCode,
            Math.Round((myProcess.ExitTime - myProcess.StartTime).TotalMilliseconds))
        eventHandled.TrySetResult(True)
    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)).Wait()

    End Sub
End Class

Kommentarer

Händelsen Exited anger att den associerade processen avslutades. Den här förekomsten innebär antingen att processen avslutades (avbröts) eller stängdes. Den här händelsen kan bara inträffa om värdet för EnableRaisingEvents egenskapen är true.

Det finns två sätt att meddelas när den associerade processen avslutas: synkront och asynkront. Synkront meddelande innebär att anropa WaitForExit metoden för att blockera den aktuella tråden tills processen avslutas. Asynkrona meddelanden använder Exited händelsen, vilket gör att den anropande tråden kan fortsätta att köras under tiden. I det senare fallet EnableRaisingEvents måste anges till för att true det anropande programmet ska ta emot händelsen Avslutad.

När operativsystemet stänger av en process meddelar det alla andra processer som har registrerade hanterare för händelsen Avslutad. För närvarande kan handtaget för den process som just avslutats användas för att komma åt vissa egenskaper, till exempel ExitTime och HasExited som operativsystemet underhåller tills det släpper det som hanterar helt.

Mer information om användningen av händelsen Exited i Windows Forms program finns i egenskapen SynchronizingObject.