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How to create a thread by using Visual C#
| Article ID | : | 815804 |
| Last Review | : | August 20, 2007 |
| Revision | : | 2.10 |
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SUMMARY
You can write multithreaded
applications in Microsoft Visual C# .NET or in Microsoft Visual C#. This article describes how a simple Visual C# application
can create and manage threads.
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Requirements
The following list outlines the recommended hardware, software,
network infrastructure, and service packs that you need:
| • | Microsoft Windows 2000, Microsoft Windows XP, or Microsoft Windows Server 2003 |
| • | Microsoft Visual C# .NET or Microsoft Visual C# 2005 |
This article assumes that you are familiar with the following
topics:
| • | Visual C# programming |
| • | Visual Studio .NET Integrated Development Environment
(IDE) or Visual Studio 2005 IDE |
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Create a Visual C# application with threads
| 1. | Start Microsoft Visual Studio .NET, Microsoft Visual Studio 2005, or Microsoft Visual C# 2005 Express Edition. |
| 2. | Create a new Visual C# Windows Application project
named ThreadWinApp. |
| 3. | Add a Button control to the form. By
default, the button is named Button1. |
| 4. | Add a ProgressBar component to the form.
By default, the progress bar is named ProgressBar1. |
| 5. | Right-click the form, and then click View
Code. |
| 6. | Add the following statement to the beginning of the file:using System.Threading; |
| 7. | Add the following Click event handler for
Button1:private void button1_Click(object sender, System.EventArgs e)
{
MessageBox.Show("This is the main thread");
} |
| 8. | Add the following variable to the Form1 class:private Thread trd;
|
| 9. | Add the following method to the Form1 class:private void ThreadTask()
{
int stp;
int newval;
Random rnd=new Random();
while(true)
{
stp=this.progressBar1.Step*rnd.Next(-1,2);
newval = this.progressBar1.Value + stp;
if (newval > this.progressBar1.Maximum)
newval = this.progressBar1.Maximum;
else if (newval < this.progressBar1.Minimum)
newval = this.progressBar1.Minimum;
this.progressBar1.Value = newval;
Thread.Sleep(100);
}
} |
| 10. | Add the following Load event handler for Form1. This code creates a new
thread, makes the thread a background thread, and then starts the thread.private void Form1_Load(object sender, System.EventArgs e)
{
Thread trd = new Thread(new ThreadStart(this.ThreadTask));
trd.IsBackground = true;
trd.Start();
} |
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Verify that it works
| 1. | Build and run the application. Notice that the value in
ProgressBar1 changes randomly. This is the new thread in
operation. |
| 2. | To demonstrate that the main thread is independent of the
thread that changes the value of ProgressBar1, click the
button on the form. You receive a dialog box with the following error message:This is the main thread |
Wait for input. Notice that the value in
ProgressBar1 continues to change.
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Troubleshoot
In more complex applications, make sure that you synchronize
multiple threads when you access shared variables. For more information, see
the
lock statement and related topics in the Visual C# .NET
Online Help documentation.
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REFERENCES
For more information, visit the following Microsoft Web site
or the .NET Framework SDK Documentation:
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APPLIES TO
| • | Microsoft Visual C# .NET 2002 Standard Edition |
| • | Microsoft Visual C# .NET 2003 Standard Edition |
| • | Microsoft ADO.NET 1.0 |
| • | Microsoft Common Language Runtime (included with the .NET Framework) 1.0 |
| • | Microsoft Visual C# 2005 Express Edition |
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