ThreadStart Делегат

Определение

Представляет метод, который выполняется в отношении 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()
Наследование
ThreadStart
Атрибуты

Примеры

В следующем примере кода показан синтаксис для создания и использования ThreadStart делегата с методом экземпляра и со статическим методом.The following code example shows the syntax for creating and using a ThreadStart delegate with an instance method and with a static method.

Еще один простой пример, демонстрирующий создание ThreadStart делегата, см. в Thread.Start() разделе перегрузка метода.For another simple example that demonstrates how to create a ThreadStart delegate, see the Thread.Start() method overload. Дополнительные сведения о создании потоков см. в разделе Создание потоков и передача данных во время начала.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

Комментарии

При создании управляемого потока метод, выполняемый в потоке, представляется ThreadStart делегатом ParameterizedThreadStart или делегатом Thread , который передается в конструктор.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. Поток не начинает выполняться до Thread.Start вызова метода.The thread does not begin executing until the Thread.Start method is called. Выполнение начинается с первой строки метода, представленного ThreadStart делегатом или. ParameterizedThreadStartExecution begins at the first line of the method represented by the ThreadStart or ParameterizedThreadStart delegate.

Примечание

Visual Basic и C# пользователи могут опустить ThreadStart конструктор делегата или ParameterizedThreadStart при создании потока.Visual Basic and C# users can omit the ThreadStart or ParameterizedThreadStart delegate constructor when creating a thread. В Visual Basic используйте AddressOf оператор при передаче метода Thread в Dim t As New Thread(AddressOf ThreadProc)конструктор, например.In Visual Basic, use the AddressOf operator when passing your method to the Thread constructor; for example, Dim t As New Thread(AddressOf ThreadProc). В C#службах просто укажите имя процедуры потока.In C#, simply specify the name of the thread procedure. Компилятор выбирает правильный конструктор делегата.The compiler selects the correct delegate constructor.

Для C++, начиная с .NET Framework 2,0, создание ThreadStart делегата для статического метода требует только одного параметра: адрес метода обратного вызова, дополненного именем класса.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. В более ранних версиях при создании делегата для статического метода требовалось два параметра: ноль (null) и адрес метода.In earlier versions two parameters were required when creating a delegate for a static method: zero (null) and the method address. Для метода экземпляра все версии должны иметь два параметра: переменная экземпляра и адрес метода.For an instance method, all versions require two parameters: the instance variable and the method address.

Методы расширения

GetMethodInfo(Delegate)

Получает объект, представляющий метод, представленный указанным делегатом.Gets an object that represents the method represented by the specified delegate.

Применяется к

Дополнительно