Process.Exited Kejadian

Definisi

Ruang nama:

System.Diagnostics

Rakitan:

System.Diagnostics.Process.dll

Sumber:

Process.cs

Terjadi ketika proses keluar.

public:
 event EventHandler ^ Exited;

public event EventHandler Exited;

member this.Exited : EventHandler 

Public Custom Event Exited As EventHandler 

Jenis Acara

EventHandler

Contoh

Contoh kode berikut membuat proses yang mencetak file. Ini memunculkan Exited peristiwa ketika proses keluar karena EnableRaisingEvents properti diatur ketika proses dibuat. Penanganan Exited aktivitas menampilkan informasi proses.

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]);
    }
}

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

Keterangan

Peristiwa menunjukkan Exited bahwa proses terkait keluar. Kejadian ini berarti proses dihentikan (dibatalkan) atau berhasil ditutup. Peristiwa ini hanya dapat terjadi jika nilai EnableRaisingEvents properti adalah true.

Ada dua cara untuk diberi tahu ketika proses terkait keluar: secara sinkron dan asinkron. Pemberitahuan sinkron berarti memanggil WaitForExit metode untuk memblokir utas saat ini hingga proses keluar. Pemberitahuan asinkron menggunakan peristiwa , yang memungkinkan utas Exited panggilan untuk melanjutkan eksekusi sementara itu. Dalam kasus terakhir, EnableRaisingEvents harus diatur ke agar true aplikasi panggilan menerima peristiwa Keluar.

Ketika sistem operasi mematikan proses, sistem operasi memberi tahu semua proses lain yang memiliki penangan terdaftar untuk peristiwa Keluar. Saat ini, handel proses yang baru saja keluar dapat digunakan untuk mengakses beberapa properti seperti ExitTime dan HasExited bahwa sistem operasi mempertahankan sampai rilis yang menangani sepenuhnya.

Catatan

Bahkan jika Anda memiliki handel ke proses yang keluar, Anda tidak dapat memanggil Start lagi untuk terhubung kembali ke proses yang sama. Start Memanggil secara otomatis merilis proses terkait dan terhubung ke proses dengan file yang sama tetapi sama sekali baruHandle.

Untuk informasi selengkapnya tentang penggunaan Exited peristiwa di aplikasi Formulir Windows, lihat SynchronizingObject properti .