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Thread.CurrentThread Właściwość

Definicja

Pobiera aktualnie uruchomiony wątek.

public:
 static property System::Threading::Thread ^ CurrentThread { System::Threading::Thread ^ get(); };
public static System.Threading.Thread CurrentThread { get; }
member this.CurrentThread : System.Threading.Thread
Public Shared ReadOnly Property CurrentThread As Thread

Wartość właściwości

Thread

Jest Thread to reprezentacja aktualnie uruchomionego wątku.

Przykłady

Poniższy przykład tworzy zadanie podrzędne, które z kolei tworzy 20 zadań podrzędnych. Sama aplikacja, a także każde zadanie, wywołuje metodę , która używa właściwości do wyświetlania informacji o wątku, w którym ShowThreadInformation CurrentThread jest uruchomiona.

using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;

public class Example
{
   private static Object lockObj = new Object();
   private static Object rndLock = new Object();

   public static void Main()
   {
      Random rnd = new Random();
      var tasks = new List<Task<Double>>();
      ShowThreadInformation("Application");

      Task<Double> t = Task.Run( () => { ShowThreadInformation("Main Task(Task #" + Task.CurrentId.ToString() + ")");
                                         for (int ctr = 1; ctr <= 20; ctr++)
                                           tasks.Add(Task.Factory.StartNew(
                                              () => { ShowThreadInformation("Task #" + Task.CurrentId.ToString());
                                                      long s = 0;
                                                      for (int n = 0; n <= 999999; n++) {
                                                         lock (rndLock) {
                                                            s += rnd.Next(1, 1000001);
                                                         }
                                                      }
                                                      return s/1000000.0;
                                                    } ));

                                        Task.WaitAll(tasks.ToArray());
                                        Double grandTotal = 0;
                                        Console.WriteLine("Means of each task: ");
                                        foreach (var child in tasks) {
                                           Console.WriteLine("   {0}", child.Result);
                                           grandTotal += child.Result;
                                        }
                                        Console.WriteLine();
                                        return grandTotal / 20;
                                   } );
      Console.WriteLine("Mean of Means: {0}", t.Result);
   }

  private static void ShowThreadInformation(String taskName)
  {
      String msg = null;
      Thread thread = Thread.CurrentThread;
      lock(lockObj) {
         msg = String.Format("{0} thread information\n", taskName) +
               String.Format("   Background: {0}\n", thread.IsBackground) +
               String.Format("   Thread Pool: {0}\n", thread.IsThreadPoolThread) +
               String.Format("   Thread ID: {0}\n", thread.ManagedThreadId);
      }
      Console.WriteLine(msg);
   }
}
// The example displays output like the following:
//       Application thread information
//          Background: False
//          Thread Pool: False
//          Thread ID: 1
//
//       Main Task(Task #1) thread information
//          Background: True
//          Thread Pool: True
//          Thread ID: 3
//
//       Task #2 thread information
//          Background: True
//          Thread Pool: True
//          Thread ID: 4
//
//       Task #4 thread information
//          Background: True
//          Thread Pool: True
//          Thread ID: 10
//
//       Task #3 thread information
//          Background: True
//          Thread Pool: True
//          Thread ID: 9
//
//       Task #5 thread information
//          Background: True
//          Thread Pool: True
//          Thread ID: 3
//
//       Task #7 thread information
//          Background: True
//          Thread Pool: True
//          Thread ID: 5
//
//       Task #6 thread information
//          Background: True
//          Thread Pool: True
//          Thread ID: 7
//
//       Task #8 thread information
//          Background: True
//          Thread Pool: True
//          Thread ID: 6
//
//       Task #9 thread information
//          Background: True
//          Thread Pool: True
//          Thread ID: 8
//
//       Task #10 thread information
//          Background: True
//          Thread Pool: True
//          Thread ID: 9
//
//       Task #11 thread information
//          Background: True
//          Thread Pool: True
//          Thread ID: 10
//
//       Task #12 thread information
//          Background: True
//          Thread Pool: True
//          Thread ID: 6
//
//       Task #13 thread information
//          Background: True
//          Thread Pool: True
//          Thread ID: 4
//
//       Task #14 thread information
//          Background: True
//          Thread Pool: True
//          Thread ID: 3
//
//       Task #15 thread information
//          Background: True
//          Thread Pool: True
//          Thread ID: 7
//
//       Task #16 thread information
//          Background: True
//          Thread Pool: True
//          Thread ID: 5
//
//       Task #17 thread information
//          Background: True
//          Thread Pool: True
//          Thread ID: 8
//
//       Task #18 thread information
//          Background: True
//          Thread Pool: True
//          Thread ID: 9
//
//       Task #19 thread information
//          Background: True
//          Thread Pool: True
//          Thread ID: 10
//
//       Task #20 thread information
//          Background: True
//          Thread Pool: True
//          Thread ID: 4
//
//       Task #21 thread information
//          Background: True
//          Thread Pool: True
//          Thread ID: 7
//
//       Means of each task:
//          500038.740584
//          499810.422703
//          500217.558077
//          499868.534688
//          499295.505866
//          499893.475772
//          499601.454469
//          499828.532502
//          499606.183978
//          499700.276056
//          500415.894952
//          500005.874751
//          500042.237016
//          500092.764753
//          499998.798267
//          499623.054718
//          500018.784823
//          500286.865993
//          500052.68285
//          499764.363303
//
//       Mean of Means: 499908.10030605
Imports System.Collections.Generic
Imports System.Threading
Imports System.Threading.Tasks

Module Example
   Private lockObj As New Object()
   Private rndLock As New Object()
   
   Public Sub Main()
      Dim rnd As New Random()
      Dim tasks As New List(Of Task)
      ShowThreadInformation("Application")

      Dim t As Task(Of Double) = Task.Run( Function()
                                        ShowThreadInformation("Main Task(Task #" + Task.CurrentId.ToString() + ")")
                                        For ctr As Integer = 1 To 20
                                           tasks.Add(Task.Factory.StartNew( Function()
                                                                     ShowThreadInformation("Task #" + Task.CurrentId.ToString())
                                                                     Dim s As Long = 0
                                                                     For n As Integer = 0 To 999999
                                                                        SyncLock rndLock
                                                                           s += rnd.Next(1, 1000001)
                                                                        End SyncLock
                                                                     Next
                                                                     Return s/1000000
                                                                  End Function))
                                        Next

                                        Task.WaitAll(tasks.ToArray())
                                        Dim grandTotal As Double
                                        Console.WriteLine("Means of each task: ")
                                        For Each t In tasks
                                           Console.WriteLine("   {0}", t.Result)
                                           grandTotal += t.Result
                                        Next
                                        Console.WriteLine()
                                        Return grandTotal / 20
                                   End Function )
      Console.WriteLine("Mean of Means: {0}", t.Result)
   End Sub
   
   Private Sub ShowThreadInformation(taskName As String)
      Dim msg As String = Nothing
      Dim thread As Thread = Thread.CurrentThread
      SyncLock lockObj
         msg = String.Format("{0} thread information", taskName) + vbCrLf +
               String.Format("   Background: {0}", thread.IsBackground) + vbCrLf +
               String.Format("   Thread Pool: {0}", thread.IsThreadPoolThread) + vbCrLf +
               String.Format("   Thread ID: {0}", thread.ManagedThreadId) + vbCrLf
      End SyncLock
      Console.WriteLine(msg)
   End Sub
End Module
' The example displays output like the following:
'       Application thread information
'          Background: False
'          Thread Pool: False
'          Thread ID: 1
'
'       Main Task(Task #1) thread information
'          Background: True
'          Thread Pool: True
'          Thread ID: 3
'
'       Task #2 thread information
'          Background: True
'          Thread Pool: True
'          Thread ID: 4
'
'       Task #4 thread information
'          Background: True
'          Thread Pool: True
'          Thread ID: 10
'
'       Task #3 thread information
'          Background: True
'          Thread Pool: True
'          Thread ID: 9
'
'       Task #5 thread information
'          Background: True
'          Thread Pool: True
'          Thread ID: 3
'
'       Task #7 thread information
'          Background: True
'          Thread Pool: True
'          Thread ID: 5
'
'       Task #6 thread information
'          Background: True
'          Thread Pool: True
'          Thread ID: 7
'
'       Task #8 thread information
'          Background: True
'          Thread Pool: True
'          Thread ID: 6
'
'       Task #9 thread information
'          Background: True
'          Thread Pool: True
'          Thread ID: 8
'
'       Task #10 thread information
'          Background: True
'          Thread Pool: True
'          Thread ID: 9
'
'       Task #11 thread information
'          Background: True
'          Thread Pool: True
'          Thread ID: 10
'
'       Task #12 thread information
'          Background: True
'          Thread Pool: True
'          Thread ID: 6
'
'       Task #13 thread information
'          Background: True
'          Thread Pool: True
'          Thread ID: 4
'
'       Task #14 thread information
'          Background: True
'          Thread Pool: True
'          Thread ID: 3
'
'       Task #15 thread information
'          Background: True
'          Thread Pool: True
'          Thread ID: 7
'
'       Task #16 thread information
'          Background: True
'          Thread Pool: True
'          Thread ID: 5
'
'       Task #17 thread information
'          Background: True
'          Thread Pool: True
'          Thread ID: 8
'
'       Task #18 thread information
'          Background: True
'          Thread Pool: True
'          Thread ID: 9
'
'       Task #19 thread information
'          Background: True
'          Thread Pool: True
'          Thread ID: 10
'
'       Task #20 thread information
'          Background: True
'          Thread Pool: True
'          Thread ID: 4
'
'       Task #21 thread information
'          Background: True
'          Thread Pool: True
'          Thread ID: 7
'
'       Means of each task:
'          500038.740584
'          499810.422703
'          500217.558077
'          499868.534688
'          499295.505866
'          499893.475772
'          499601.454469
'          499828.532502
'          499606.183978
'          499700.276056
'          500415.894952
'          500005.874751
'          500042.237016
'          500092.764753
'          499998.798267
'          499623.054718
'          500018.784823
'          500286.865993
'          500052.68285
'          499764.363303
'
'       Mean of Means: 499908.10030605/

Każde zadanie podrzędne generuje 1 milion losowych liczb z 1 do 1 miliona i zwraca ich średnią. Zadanie nadrzędne wywołuje metodę , aby upewnić się, że zadania podrzędne zostały ukończone przed wyświetleniem średniej zwróconej przez każde zadanie i Task.WaitAll obliczeniem średniej średniej poszczególnych zadań.

Należy pamiętać, że gdy aplikacja jest uruchamiana w wątku pierwszego planu, każde zadanie jest uruchamiane w wątku puli wątków.

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