C#线程安全使用（四）_C

概述这是时隔多年第四篇，主要是因为身在东软受内网限制，好多文章就只好发到东软内部网站，懒的发到外面，现在一点点把在东软写的文章给转移出来。这里主要讲解下CancellationTokenSource，C

这是时隔多年第四篇，主要是因为身在东软受内网限制，好多文章就只好发到东软内部网站，懒的发到外面，现在一点点把在东软写的文章给转移出来。

这里主要讲解下CancellationTokenSource，CancellationTokenSource是用于取消线程，具体使用起来有点另类：首先定义实体，然后将其下的属性ToKen传递给线程，当需要取消线程时，调用下Cancel()方法。例子我依然采用了MSDN的例子,但我做了一些修改，这个例子虽然看起来挺复杂，但还是记录了许多内容。

由于不好理解，我就粗略讲解下：

Task fTask = factory.ContinueWhenAll(tasks.ToArray(),上面是创建任务，创建10个线程，并且线程中增加了判断，如果随即数等于0就取消该线程。

再介绍下factory.ContinueWhenAll，他包含两个参数Task[] tasks,Action continuationAction。MSDN的解释是：

方法执行

英文解释：

CancellationTokenSource source = == = []>> tasks = List[]>>= ( taskCtr = ; taskCtr <= ; taskCtr++ iteration = taskCtr + =>[] values = [ ( ctr = ; ctr <= ; ctr++= rnd.Next(, (value ==

                values[ctr </span>- <span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #800080;"&gt;1</span>] =<span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #000000;"&gt; value;            }            Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>e.Write<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne(</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #800000;"&gt;"</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #800000;"&gt;NO Cancel at task {0}</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #800000;"&gt;"</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #000000;"&gt;,i<a href="https://www.jb51.cc/tag/tera/" target="_blank" >tera</a>tion);            </span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #0000ff;"&gt;return</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #000000;"&gt; values;        },token));    }    </span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #0000ff;"&gt;try</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #000000;"&gt;    {        Task</span><<span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #0000ff;"&gt;double</span>> fTask =<span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #000000;"&gt; factory.ContinueWhenAll(tasks.ToArray(),(res<a href="https://m.jb51.cc/tag/ul/" target="_blank" >ul</a>ts) </span>=><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #000000;"&gt;                                                     {                                                         Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>e.Write<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne(</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #800000;"&gt;"</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #800000;"&gt;Cal<a href="https://www.jb51.cc/tag/cula/" target="_blank" >cula</a>ting overall mean...</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #800000;"&gt;"</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #000000;"&gt;);                                                         </span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #0000ff;"&gt;long</span> sum = <span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #800080;"&gt;0</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #000000;"&gt;;                                                         </span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #0000ff;"&gt;int</span> n = <span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #800080;"&gt;0</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #000000;"&gt;;                                                         </span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #0000ff;"&gt;foreach</span> (<span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #0000ff;"&gt;var</span> t <span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #0000ff;"&gt;in</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #000000;"&gt; res<a href="https://m.jb51.cc/tag/ul/" target="_blank" >ul</a>ts)                                                         {                                                             </span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #0000ff;"&gt;foreach</span> (<span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #0000ff;"&gt;var</span> r <span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #0000ff;"&gt;in</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #000000;"&gt; t.Res<a href="https://m.jb51.cc/tag/ul/" target="_blank" >ul</a>t)                                                             {                                                                 sum </span>+=<span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #000000;"&gt; r;                                                                 n</span>++<span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #000000;"&gt;;                                                             }                                                         }                                                         </span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #0000ff;"&gt;return</span> sum / (<span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #0000ff;"&gt;double</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #000000;"&gt;)n;                                                     },token);        Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>e.Write<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne(</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #800000;"&gt;"</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #800000;"&gt;The mean is {0}.</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #800000;"&gt;"</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #000000;"&gt;,fTask.Res<a href="https://m.jb51.cc/tag/ul/" target="_blank" >ul</a>t);    }    </span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #0000ff;"&gt;catch</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #000000;"&gt; (AggregateException ae)    {        </span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #0000ff;"&gt;foreach</span> (Exception e <span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #0000ff;"&gt;in</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #000000;"&gt; ae.InnerExceptions)        {            </span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #0000ff;"&gt;if</span> (e <span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #0000ff;"&gt;is</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #000000;"&gt; TaskCanceledException)                Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>e.Write<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne(</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #800000;"&gt;"</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #800000;"&gt;Unable to co<a href="https://www.jb51.cc/tag/mpu/" target="_blank" >mpu</a>te mean: {0}</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #800000;"&gt;"</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #000000;"&gt;,((TaskCanceledException)e).Message);            </span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #0000ff;"&gt;else</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #000000;"&gt;                Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>e.Write<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne(</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #800000;"&gt;"</span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #800000;"&gt;Exception: </span><span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #800000;"&gt;"</span> +<span https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #000000;"&gt; e.GetType().<a href="https://m.jb51.cc/tag/name/" target="_blank" >name</a>);        }    }    Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>e.Read<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne();}

}

显示结果图片，每次的结果都不一样的，所以我也是运行了好几次，看这个结果会发现一件事，线程只执行了两个，即当线程2中调用Cancel后，其他线程也被取消了。

总结

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