ThreadStart Delegate
Assembly: mscorlib (in mscorlib.dll)
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 System.Threading.Thread.Start method is called. Execution begins at the first line of the method represented by the ThreadStart or ParameterizedThreadStart delegate.
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| 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. |
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| In version 2.0 of the .NET Framework, creating a ThreadStart delegate for a static method in C++ 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. |
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.
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 explicityly. // 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 */
import System.*;
import System.Threading.*;
import System.Threading.Thread;
class Test
{
public static void main(String[] args)
{
ThreadStart threadDelegate = new ThreadStart(Work.DoWork);
Thread newThread = new Thread(threadDelegate);
newThread.Start();
} //main
} //Test
class Work
{
public static void DoWork()
{
} //DoWork
} //Work
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.
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