ThreadStart Délégué

Définition

Représente la méthode qui s’exécute sur un élément Thread.Represents the method that executes on a Thread.

public delegate void ThreadStart();
[System.Runtime.InteropServices.ComVisible(true)]
public delegate void ThreadStart();
public delegate void ThreadStart();
type ThreadStart = delegate of unit -> unit
Public Delegate Sub ThreadStart()
Héritage
ThreadStart
Attributs

Exemples

L’exemple de code suivant illustre la syntaxe de création et d’utilisation d’un délégué ThreadStart avec une méthode d’instance et une méthode statique.The following code example shows the syntax for creating and using a ThreadStart delegate with an instance method and with a static method.

Pour un autre exemple simple qui montre comment créer un délégué ThreadStart, consultez la surcharge de méthode Thread.Start().For another simple example that demonstrates how to create a ThreadStart delegate, see the Thread.Start() method overload. Pour plus d’informations sur la création de threads, consultez création de threads et passage de données au moment du démarrage.For more information about thread creation, see Creating Threads and Passing Data at Start Time.

using namespace System;
using namespace System::Threading;
ref class Work
{
public:
   static void DoWork()
   {
      Console::WriteLine( "Static thread procedure." );
   }

   int Data;
   void DoMoreWork()
   {
      Console::WriteLine( "Instance thread procedure. Data={0}", Data );
   }

};

int main()
{
   
   // To start a thread using an instance method for the thread 
   // procedure, specify the object as the first argument of the
   // ThreadStart constructor.
   //
   Work^ w = gcnew Work;
   w->Data = 42;
   ThreadStart^ threadDelegate = gcnew ThreadStart( w, &Work::DoMoreWork );
   Thread^ newThread = gcnew Thread( threadDelegate );
   newThread->Start();
   
   // To start a thread using a static thread procedure, specify
   // only the address of the procedure. This is a change from 
   // earlier versions of the .NET Framework, which required 
   // two arguments, the first of which was null (0).
   //
   threadDelegate = gcnew ThreadStart( &Work::DoWork );
   newThread = gcnew Thread( threadDelegate );
   newThread->Start();
}

/* This code example produces the following output (the order 
   of the lines might vary):
Static thread procedure.
Instance thread procedure. Data=42
 */
using System;
using System.Threading;

class Test
{
    static void Main() 
    {
        // To start a thread using a static thread procedure, use the
        // class name and method name when you create the ThreadStart
        // delegate. Beginning in version 2.0 of the .NET Framework,
        // it is not necessary to create a delegate explicitly. 
        // Specify the name of the method in the Thread constructor, 
        // and the compiler selects the correct delegate. For example:
        //
        // Thread newThread = new Thread(Work.DoWork);
        //
        ThreadStart threadDelegate = new ThreadStart(Work.DoWork);
        Thread newThread = new Thread(threadDelegate);
        newThread.Start();

        // To start a thread using an instance method for the thread 
        // procedure, use the instance variable and method name when 
        // you create the ThreadStart delegate. Beginning in version
        // 2.0 of the .NET Framework, the explicit delegate is not
        // required.
        //
        Work w = new Work();
        w.Data = 42;
        threadDelegate = new ThreadStart(w.DoMoreWork);
        newThread = new Thread(threadDelegate);
        newThread.Start();
    }
}

class Work 
{
    public static void DoWork() 
    {
        Console.WriteLine("Static thread procedure."); 
    }
    public int Data;
    public void DoMoreWork() 
    {
        Console.WriteLine("Instance thread procedure. Data={0}", Data); 
    }
}

/* This code example produces the following output (the order 
   of the lines might vary):
Static thread procedure.
Instance thread procedure. Data=42
 */
Imports System.Threading

Public Class Test

    <MTAThread> _
    Shared Sub Main()
        ' To start a thread using a static thread procedure, use the
        ' class name and method name when you create the ThreadStart
        ' delegate. Visual Basic expands the AddressOf expression 
        ' to the appropriate delegate creation syntax:
        '    New ThreadStart(AddressOf Work.DoWork)
        '
        Dim newThread As New Thread(AddressOf Work.DoWork)
        newThread.Start()

        ' To start a thread using an instance method for the thread 
        ' procedure, use the instance variable and method name when 
        ' you create the ThreadStart delegate. Visual Basic expands 
        ' the AddressOf expression to the appropriate delegate 
        ' creation syntax:
        '    New ThreadStart(AddressOf w.DoMoreWork)
        '
        Dim w As New Work()
        w.Data = 42
        newThread = new Thread(AddressOf w.DoMoreWork)
        newThread.Start()
    End Sub
End Class

Public Class Work 
    Public Shared Sub DoWork()
        Console.WriteLine("Static thread procedure.")
    End Sub
    Public Data As Integer
    Public Sub DoMoreWork() 
        Console.WriteLine("Instance thread procedure. Data={0}", Data) 
    End Sub
End Class

' This code example produces the following output (the order 
'   of the lines might vary):
'
'Static thread procedure.
'Instance thread procedure. Data=42

Remarques

Quand un thread managé est créé, la méthode qui s’exécute sur le thread est représentée par un délégué ThreadStart ou un délégué ParameterizedThreadStart passé au constructeur Thread.When a managed thread is created, the method that executes on the thread is represented by a ThreadStart delegate or a ParameterizedThreadStart delegate that is passed to the Thread constructor. Le thread ne commence pas à s’exécuter jusqu’à ce que la méthode Thread.Start soit appelée.The thread does not begin executing until the Thread.Start method is called. L’exécution commence à la première ligne de la méthode représentée par le ThreadStart ou ParameterizedThreadStart délégué.Execution begins at the first line of the method represented by the ThreadStart or ParameterizedThreadStart delegate.

Notes

Visual Basic et C# les utilisateurs peuvent omettre le constructeur délégué ThreadStart ou ParameterizedThreadStart lors de la création d’un thread.Visual Basic and C# users can omit the ThreadStart or ParameterizedThreadStart delegate constructor when creating a thread. Dans Visual Basic, utilisez l’opérateur AddressOf quand vous passez votre méthode au constructeur Thread ; par exemple, Dim t As New Thread(AddressOf ThreadProc).In Visual Basic, use the AddressOf operator when passing your method to the Thread constructor; for example, Dim t As New Thread(AddressOf ThreadProc). Dans C#, spécifiez simplement le nom de la procédure de thread.In C#, simply specify the name of the thread procedure. Le compilateur sélectionne le constructeur délégué approprié.The compiler selects the correct delegate constructor.

Pour C++, à partir de .NET Framework 2,0, la création d’un délégué ThreadStart pour une méthode statique requiert un seul paramètre : l’adresse de la méthode de rappel, qualifiée par le nom de la classe.For C++, starting with .NET Framework 2.0, creating a ThreadStart delegate for a static method requires only one parameter: the address of the callback method, qualified by the class name. Dans les versions antérieures, deux paramètres étaient requis lors de la création d’un délégué pour une méthode statique : zéro (null) et l’adresse de la méthode.In earlier versions two parameters were required when creating a delegate for a static method: zero (null) and the method address. Pour une méthode d’instance, toutes les versions requièrent deux paramètres : la variable d’instance et l’adresse de la méthode.For an instance method, all versions require two parameters: the instance variable and the method address.

Méthodes d’extension

GetMethodInfo(Delegate)

Obtient un objet qui représente la méthode représentée par le délégué spécifié.Gets an object that represents the method represented by the specified delegate.

S’applique à

Voir aussi