我永远爱触手猴

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// 互斥锁
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private static object _lockobject = new object();

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public ActionResult Index() {
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    String str;
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    lock (_lockobject)
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    {
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        str = dosomething();
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    }
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    return View();
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}

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public ActionResult Index() {
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    String str;
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    if (Monitor.TryEnter(_lockobject, TimeSpan.FromSeconds(5)))
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    {
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        str = dosomething();
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        Monitor.Exit(_lockobject);
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    }
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    else str = "Took too long!";
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    return View();
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}