ThreadStart Delegate (System.Threading)

Examples

The following code example shows the syntax for creating and using a ThreadStart delegate with an instance method and with a static method.
For another simple example that demonstrates how to create a ThreadStart delegate, see the Thread.Start() method overload. 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
     
      Remarks
     
     
      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. The thread does not begin executing until the
      
       Thread.Start
      
      method is called. Execution begins at the first line of the method represented by the
      
       ThreadStart
      
      or
      
       ParameterizedThreadStart
      
      delegate.
     
     
      Visual Basic and C# users can omit the
      
       ThreadStart
      
      or
      
       ParameterizedThreadStart
      
      delegate constructor when creating a thread. In Visual Basic, use the
      
       AddressOf
      
      operator when passing your method to the
      
       Thread
      
      constructor; for example,
      
       Dim t As New Thread(AddressOf ThreadProc)
      
      . In C#, simply specify the name of the thread procedure. The compiler selects the correct delegate constructor.
     
     
      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. In earlier versions two parameters were required when creating a delegate for a static method: zero (null) and the method address. For an instance method, all versions require two parameters: the instance variable and the method address.
     
     
      Extension Methods