ThreadStart Delegate
Represents the method that executes on a Thread.
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 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 and Passing Data at Start Time.
Imports System 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
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The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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