ThreadStart Delegát

Definice

Představuje metodu, která je spuštěna na Thread.Represents the method that executes on a Thread.

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

Příklady

Následující příklad kódu ukazuje syntaxi pro vytvoření a použití ThreadStart delegáta s metodou instance a se statickou metodou.The following code example shows the syntax for creating and using a ThreadStart delegate with an instance method and with a static method.

Další jednoduchý příklad, který ukazuje, jak vytvořit ThreadStart delegáta, Thread.Start() naleznete v tématu přetížení metody.For another simple example that demonstrates how to create a ThreadStart delegate, see the Thread.Start() method overload. Další informace o vytváření vláken naleznete v tématu vytváření vláken a předávání dat v počátečním čase.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

Poznámky

Při vytvoření spravovaného vlákna je metoda, která se spouští ve vlákně, reprezentovaná ThreadStart delegátem ParameterizedThreadStart nebo delegátem Thread , který se předává konstruktoru.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. Vlákno se nezačne spouštět, dokud Thread.Start není volána metoda.The thread does not begin executing until the Thread.Start method is called. Spuštění začíná na prvním řádku metody reprezentované ThreadStart delegátem nebo. ParameterizedThreadStartExecution begins at the first line of the method represented by the ThreadStart or ParameterizedThreadStart delegate.

Poznámka

Visual Basic a C# uživatelé mohou při vytváření ThreadStart vlákna ParameterizedThreadStart vypustit konstruktor nebo delegáta.Visual Basic and C# users can omit the ThreadStart or ParameterizedThreadStart delegate constructor when creating a thread. V Visual Basic použijte AddressOf operátor při předávání metody Thread Dim t As New Thread(AddressOf ThreadProc)konstruktoru, například.In Visual Basic, use the AddressOf operator when passing your method to the Thread constructor; for example, Dim t As New Thread(AddressOf ThreadProc). V C#zadejte jednoduše název procedury vlákna.In C#, simply specify the name of the thread procedure. Kompilátor vybere správný konstruktor delegáta.The compiler selects the correct delegate constructor.

Pro C++, počínaje .NET Framework 2,0, vytvoření ThreadStart delegáta pro statickou metodu vyžaduje pouze jeden parametr: adresu metody zpětného volání, která je kvalifikována názvem třídy.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. V dřívějších verzích byly dva parametry požadovány při vytváření delegáta pro statickou metodu: nula (null) a adresa metody.In earlier versions two parameters were required when creating a delegate for a static method: zero (null) and the method address. Pro metodu instance všechny verze vyžadují dva parametry: proměnnou instance a adresu metody.For an instance method, all versions require two parameters: the instance variable and the method address.

Metody rozšíření

GetMethodInfo(Delegate)

Získává objekt, který představuje metodu reprezentovanou zadaným delegátem.Gets an object that represents the method represented by the specified delegate.

Platí pro

Viz také