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15.4 ThreadPlayaround示例
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15.4 ThreadPlayaround示例
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<div style='float:left;width:49%'>·<a href='100165449.htm'>15.1 线程</a></div><div style='float:right;width:49%'>·<a href='100165450.htm'>15.2 多线程应用程序</a></div><div style='float:left;width:49%'>·<a href='100165451.htm'>15.3 线程的处理</a></div><div style='float:right;width:49%'>·<a href='100165453.htm'>15.5 线程的优先级</a></div><div style='float:left;width:49%'>·<a href='100165454.htm'>15.6 同步</a></div><div style='float:right;width:49%'>·<a href='100165455.htm'>15.6.1 同步的含义</a></div></div>
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<div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><h3 style="MARGIN-TOP: 11.4pt; MARGIN-LEFT: 0cm; MARGIN-RIGHT: 0cm; FTEL: 11.4pt"><a ftel="_Toc507815087"><span lang="EN-US">15.4 ThreadPlayaround</span></a><span style="FONT-FAMILY: 楷体_GB2312">示例</span></h3>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">下面用一个简单的示例</span><span lang="EN-US">ThreadPlayaround</span><span style="FONT-FAMILY: 宋体">来说明如何使用线程。这个示例的目的是介绍如何处理线程，而不是说明实际编程问题。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">示例</span><span lang="EN-US">ThreadPlayaround</span><span style="FONT-FAMILY: 宋体">的核心是方法</span><span lang="EN-US">DisplayNumbers()</span><span style="FONT-FAMILY: 宋体">，它累加一个数字，并显示每次累加的结果。</span><span lang="EN-US">DisplayNumbers()</span><span style="FONT-FAMILY: 宋体">还会显示它运行的线程名称和文化背景：</span></p>
<p class="2" style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US"> static void DisplayNumbers()</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Thread thisThread = Thread.CurrentThread;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> string name = thisThread.Name;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Console.WriteLine("Starting thread: " + name);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Console.WriteLine(name + ": Current Culture = " +</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> thisThread.CurrentCulture);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> for (int i=1 ; i<= 8*interval ; i++)</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> if (i%interval == 0)</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Console.WriteLine(name + ": count has reached " + i);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> }</span></p>
<p class="2" style="MARGIN-TOP: 0cm; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US"> }</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">累加的数字取决于</span><span lang="EN-US">interval</span><span style="FONT-FAMILY: 宋体">字段，它的值是用户输入的。如果用户输入</span><span lang="EN-US">100</span><span style="FONT-FAMILY: 宋体">，就累加到</span><span lang="EN-US">800</span><span style="FONT-FAMILY: 宋体">，显示数字</span><span lang="EN-US">100, 200, 300, 400, 500, 600, 700</span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US">800</span><span style="FONT-FAMILY: 宋体">，如果用户输入</span><span lang="EN-US">1000</span><span style="FONT-FAMILY: 宋体">，就累加到</span><span lang="EN-US">8000</span><span style="FONT-FAMILY: 宋体">，显示数字</span><span lang="EN-US">1000, 2000, 3000, 4000, 5000, 6000, 7000</span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US"> 8000</span><span style="FONT-FAMILY: 宋体">，依次类推。这似乎是一个没有意义的方法，但它的目的是让处理器停止一段时间，以便查看处理器是如何处理这个任务的。</span></p>
<p class="MsoNormal"><span lang="EN-US">ThreadPlayaround</span><span style="FONT-FAMILY: 宋体">示例启动了第二个工作线程，运行</span><span lang="EN-US">DisplayNumbers()</span><span style="FONT-FAMILY: 宋体">，但启动这个工作线程后，主线程就开始执行同一个方法，此时我们应看到有两个累加过程同时发生。</span></p>
<p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><span lang="EN-US">ThreadPlayaround</span><span style="FONT-FAMILY: 宋体">示例的</span><span lang="EN-US">Main()</span><span style="FONT-FAMILY: 宋体">方法及其包含的类如下所示：</span></p>
<p class="2" style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US"> class EntryPoint</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> static int interval;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> static void Main()</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Console.Write("Interval to display results at?> ");</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> interval = int.Parse(Console.ReadLine());</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Thread thisThread = Thread.CurrentThread;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> thisThread.Name = "Main Thread";</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> ThreadStart workerStart = new ThreadStart(StartMethod);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Thread workerThread = new Thread(workerStart);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> workerThread.Name = "Worker";</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> workerThread.Start();</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> DisplayNumbers();</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Console.WriteLine("Main Thread Finished");</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Console.ReadLine();</span></p>
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