Process.HasExited 屬性

  • 參考

定義

命名空間:
System.Diagnostics
組件:
System.Diagnostics.Process.dll
組件:
System.dll
組件:
netstandard.dll
來源:
Process.cs
來源:
Process.cs
來源:
Process.cs

取得值，指出相關的處理序是否已經終止。

public:
 property bool HasExited { bool get(); };
public bool HasExited { get; }
[System.ComponentModel.Browsable(false)]
public bool HasExited { get; }
member this.HasExited : bool
[<System.ComponentModel.Browsable(false)>]
member this.HasExited : bool
Public ReadOnly Property HasExited As Boolean

屬性值

Boolean

如果 Process 元件所參考的作業系統處理序已終止，則為 true，否則為 false。

屬性
BrowsableAttribute

例外狀況

InvalidOperationException

沒有與這個物件關聯的處理序。

Win32Exception

無法擷取處理序的結束代碼。

NotSupportedException

您正在嘗試存取於遠端電腦上執行之處理序的 HasExited 屬性。 這個屬性僅供在本機電腦執行的處理序使用。

範例

下列範例會啟動記事本的實例。 然後，它會擷取相關聯進程的物理記憶體使用量，間隔上限為10秒。 此範例會偵測進程是否在經過10秒之前結束。 此範例會在 10 秒後仍在執行時關閉進程。

#using <System.dll>

using namespace System;
using namespace System::Diagnostics;
using namespace System::Threading;
int main()
{
   try
   {
      Process^ myProcess;
      myProcess = Process::Start(  "Notepad.exe" );
      
      // Display physical memory usage 5 times at intervals of 2 seconds.
      for ( int i = 0; i < 5; i++ )
      {
         if (  !myProcess->HasExited )
         {
            
            // Discard cached information about the process.
            myProcess->Refresh();
            
            // Print working set to console.
            Console::WriteLine( "Physical Memory Usage : {0}", myProcess->WorkingSet.ToString() );
            
            // Wait 2 seconds.
            Thread::Sleep( 2000 );
         }
         else
         {
            break;
         }

      }
      myProcess->CloseMainWindow();
      
      // Free resources associated with process.
      myProcess->Close();
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "The following exception was raised: " );
      Console::WriteLine( e->Message );
   }

}

using System;
using System.ComponentModel;
using System.Diagnostics;
using System.IO;
using System.Threading;

namespace ProcessSample
{
    class MyProcessClass
    {
        public static void Main()
        {
            try
            {
                using (Process myProcess = Process.Start("Notepad.exe"))
                {
                    // Display physical memory usage 5 times at intervals of 2 seconds.
                    for (int i = 0; i < 5; i++)
                    {
                        if (!myProcess.HasExited)
                        {
                            // Discard cached information about the process.
                            myProcess.Refresh();
                            // Print working set to console.
                            Console.WriteLine($"Physical Memory Usage: {myProcess.WorkingSet}");
                            // Wait 2 seconds.
                            Thread.Sleep(2000);
                        }
                        else
                        {
                            break;
                        }
                    }

                    // Close process by sending a close message to its main window.
                    myProcess.CloseMainWindow();
                    // Free resources associated with process.
                    myProcess.Close();
                }
            }
            catch (Exception e) when (e is Win32Exception || e is FileNotFoundException)
            {
                Console.WriteLine("The following exception was raised: ");
                Console.WriteLine(e.Message);
            }
        }
    }
}

Imports System.ComponentModel
Imports System.Diagnostics
Imports System.IO
Imports System.Threading

Namespace Process_Sample
    Class MyProcessClass

        Public Shared Sub Main()
            Try
                Using myProcess = Process.Start("Notepad.exe")
                    ' Display physical memory usage 5 times at intervals of 2 seconds.
                    Dim i As Integer
                    For i = 0 To 4
                        If Not myProcess.HasExited Then

                            ' Discard cached information about the process.
                            myProcess.Refresh()
                            ' Print working set to console.
                            Console.WriteLine($"Physical Memory Usage: {myProcess.WorkingSet}")
                            ' Wait 2 seconds.
                            Thread.Sleep(2000)
                        Else
                            Exit For
                        End If

                    Next i

                    ' Close process by sending a close message to its main window.
                    myProcess.CloseMainWindow()
                    ' Free resources associated with process.
                    myProcess.Close()
                End Using
            Catch e As Exception When TypeOf e Is Win32Exception Or TypeOf e Is FileNotFoundException
                Console.WriteLine("The following exception was raised: ")
                Console.WriteLine(e.Message)
            End Try
        End Sub
    End Class
End Namespace 'Process_Sample

備註

的值trueHasExited表示相關聯的進程已正常或異常終止。 您可以呼叫 CloseMainWindow 或 Kill，要求或強制相關聯的進程結束。 如果進程開啟句柄，當進程結束時，操作系統會釋放進程記憶體，但會保留進程的系統管理資訊，例如句柄、結束代碼和結束時間。 若要取得這項資訊，您可以使用 ExitCode 和 ExitTime 屬性。 這些屬性會自動填入此元件啟動的進程。 系統管理資訊會在與系統進程相關聯的所有 Process 元件遭到終結時釋放，而且不會再保留已結束進程的句柄。

進程可以獨立於程式代碼中終止。 如果您使用這個元件啟動進程，系統就會自動更新 的值 HasExited ，即使相關聯的進程獨立結束也一樣。

注意

當標準輸出重新導向至異步事件處理程式時，當這個屬性傳 true回 時，輸出處理可能不會完成。 若要確保異步事件處理已完成，請在檢查 HasExited之前呼叫WaitForExit()不採用參數的多載。

適用於

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