ThreadStart Delegera

Definition

public delegate void ThreadStart();

public delegate void ThreadStart();

[System.Runtime.InteropServices.ComVisible(true)]
public delegate void ThreadStart();

type ThreadStart = delegate of unit -> unit

[<System.Runtime.InteropServices.ComVisible(true)>]
type ThreadStart = delegate of unit -> unit

Public Delegate Sub ThreadStart()

Attribut

ComVisibleAttribute

Exempel

I följande kodexempel visas syntaxen för att skapa och använda ett ThreadStart ombud med en instansmetod och med en statisk metod.

Ett annat enkelt exempel som visar hur du skapar ett ThreadStart ombud finns i Thread.Start() metodens överlagring. Mer information om hur du skapar trådar finns i Skapa trådar och skicka data vid starttid.

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

Kommentarer

När en hanterad tråd skapas representeras metoden som körs på tråden av ett ThreadStart ombud eller ett ParameterizedThreadStart ombud som skickas till Thread konstruktorn. Tråden börjar inte köras förrän Thread.Start metoden anropas. Körningen börjar på den första raden i metoden som representeras av ThreadStart eller ParameterizedThreadStart delegeras.

Se även

• ParameterizedThreadStart
• Thread
• Start
• AppDomain
• Skapa trådar och skicka data vid starttid