blocks|key|1074648|text|除了安德鲁的回答之外，你还可以使用BackgroundWorker，它已经有了RunWorkerCompleted+event+BackgroundWorker|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1074649|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker%2528v=vs.100%2529.aspx^0|1S|G|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Beside Andrew's Answer you can use BackgroundWorker It has already has RunWorkerCompleted event
<a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker%28v=vs.100%29.aspx" rel="nofollow">BackgroundWorker</a>

blocks|key|4424468|text|var+thr+=+new+Thread(x+=>+SendMail(node.Attributes["id"].Value.ToString(),+node["fname"].InnerText+%2B++++++"+"+%2B+node["lname"].InnerText,+500,+node["email"].InnerText));
thr.Start();
thr.Join();//In+this+place+main+thread+will+wait|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4424469|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>var thr = new Thread(x =&gt; SendMail(node.Attributes["id"].Value.ToString(), node["fname"].InnerText + " " + node["lname"].InnerText, 500, node["email"].InnerText));
thr.Start();
thr.Join();//In this place main thread will wait
</code></pre>

blocks|key|1074543|text|您应该保留对您创建的线程实例的引用，然后检查ThreadState。您还可以检查IsAlive属性，以查看线程当前是否正在执行。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1074544|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.threading.threadstate.aspx|1|http://msdn.microsoft.com/en-us/library/system.threading.thread.isalive.aspx^0|M|B|14|7|M|B|0|14|7|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]|$9|S|A|T|B|C]]|D|@$9|U|A|V|1|W]|$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]|N|$5|I|J|K|E|$L|O]]]]

You should keep a reference to the thread instance you create and then check the <a href="http://msdn.microsoft.com/en-us/library/system.threading.threadstate.aspx" rel="nofollow"><code>ThreadState</code></a>. You can also check the <a href="http://msdn.microsoft.com/en-us/library/system.threading.thread.isalive.aspx" rel="nofollow"><code>IsAlive</code></a> property to see if the thread is currently executing or not.

blocks|key|4424506|text|这取决于您的环境。例如，您可以通过使用Tasks并订阅continuation来避免所有Thread。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4424507|例如：|4424508|var+task+=+Task.Run(DoSomething)
+++++++++++++++.ContinueWith(a+=>+Whatever())|code-block|syntax|javascript|4424509|或者使用C#+5提供的方便关键字：|4424510|var+task+=+await+Task.Run(DoSomething);
Whatever();|4424511|如果您必须使用线程，我建议您传递一个委托，当电子邮件完成时，您只需调用它：|4424512|//+Outside+the+thread
private+Action+callback;

//+Before+starting+the+thread
callback+=+MyMethod/*Or+a+lambda+if+you+want*/;

//+In+the+thread+action
Action<object>+threadBody+=+x+=>+
{
++++SendMail(node.Attributes["id"].Value.ToString(),+node["fname"].InnerText+%2B++++++"+"+%2B+node["lname"].InnerText,+500,+node["email"].InnerText);
++++callback();
};|4424513|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

It depends on what your environment is. You can, for example, avoid at all Threads by using Tasks and subscribing to the continuation.

e.g.

<pre><code>var task = Task.Run(DoSomething)
 .ContinueWith(a =&gt; Whatever())
</code></pre>

Or by using the convenience keywords given by C# 5:

<pre><code>var task = await Task.Run(DoSomething);
Whatever();
</code></pre>

If you MUST use threads I recommend to pass a delegate and when the e-mail has finished you have just to call it:

<pre><code>// Outside the thread
private Action callback;

// Before starting the thread
callback = MyMethod/*Or a lambda if you want*/;

// In the thread action
Action&lt;object&gt; threadBody = x =&gt; 
{
 SendMail(node.Attributes["id"].Value.ToString(), node["fname"].InnerText + " " + node["lname"].InnerText, 500, node["email"].InnerText);
 callback();
};
</code></pre>

blocks|key|4424539|text|另一种变体是结合使用ManualResetEvent和ThreadPool.QueueUserWorkItem|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4424540|例如：|4424541|private+void+DoWork()
{
++++List<ManualResetEvent>+events+=+new+List<ManualResetEvent>();

++++//in+case+you+need+to+loop+through+multiple+email+addresses+
++++//use+the+foreach+here,+assuming+that+the+items+is+a+list.

++++//foreach(var+item+in+items)
++++//{
++++var+resetEvent+=+new+ManualResetEvent(false);
++++ThreadPool.QueueUserWorkItem(arg+=>
++++{
++++++++SendMail(node.Attributes["id"].Value.ToString(),+
+++++++++++node["fname"].InnerText+%2B+"+"+%2B+node["lname"].InnerText,
+++++++++++500,+node["email"].InnerText);
++++++++resetEvent.Set();
++++});
++++events.Add(resetEvent);

++++//}+<-+closes+the+foreach+loop

++++//WaitHandle.WaitAll+waits+for+all+the+threads+to+finish.
++++WaitHandle.WaitAll(events.ToArray());
++++MessageBox.Show("Mails+are+sent",+"Notification");
}|code-block|syntax|javascript|4424542|如果你想遍历一个电子邮件地址列表或数组，并为每个邮件单独启动一个线程，这将特别有用。|4424543|在您的情况下，如果您想在等待邮件发送的同时做其他事情。您可以简单地在后台线程中运行上面的代码，当消息出现时，您就知道工作已经完成。|4424544|public+void+StartMailThread()
{
++++Thread+myThread+=+new+Thread(DoWork)
++++{
++++++++IsBackground+=+true,
++++++++Name+=+"MailThread"
++++};
++++myThread.Start();
}|4424545|不过，使用线程启动线程池对我来说似乎有点奇怪。|4424546|entityMap^0|A|G|R|S|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|12|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|13|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|14|8|@]|D|@]|E|$]]|$1|Q|3|R|5|J|7|15|8|@]|D|@]|E|$K|L]]|$1|S|3|T|5|6|7|16|8|@]|D|@]|E|$]]|$1|U|3|-4|5|6|7|17|8|@]|D|@]|E|$]]]|V|$]]

Another variation is to use the <code>ThreadPool.QueueUserWorkItem</code> in combination with <code>ManualResetEvent</code>:

Such as:

<pre><code>private void DoWork()
{
 List&lt;ManualResetEvent&gt; events = new List&lt;ManualResetEvent&gt;();

 //in case you need to loop through multiple email addresses 
 //use the foreach here, assuming that the items is a list.

 //foreach(var item in items)
 //{
 var resetEvent = new ManualResetEvent(false);
 ThreadPool.QueueUserWorkItem(arg =&gt;
 {
 SendMail(node.Attributes["id"].Value.ToString(), 
 node["fname"].InnerText + " " + node["lname"].InnerText,
 500, node["email"].InnerText);
 resetEvent.Set();
 });
 events.Add(resetEvent);

 //} &lt;- closes the foreach loop

 //WaitHandle.WaitAll waits for all the threads to finish.
 WaitHandle.WaitAll(events.ToArray());
 MessageBox.Show("Mails are sent", "Notification");
}
</code></pre>

This would be especially usefull in case you want to loop through a list or array of email-addresses and start a thread for each mail individually.

In your case if you want to do other things while waiting for the mails being sent. You could simply run the code above in a backgroundthread and when the message shows up you know work is completed.

<pre><code>public void StartMailThread()
{
 Thread myThread = new Thread(DoWork)
 {
 IsBackground = true,
 Name = "MailThread"
 };
 myThread.Start();
}
</code></pre>

Although, to start a threadpool using a thread seems a bit weird to me.

I am running a thread in which mail is being sent. How can I know that a thread has completed its execution?

<pre><code>new Thread(x =&gt; SendMail(node.Attributes["id"].Value.ToString(), node["fname"].InnerText + " " + node["lname"].InnerText, 500, node["email"].InnerText)).Start();
</code></pre>

Get status of thread

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在运行一个正在发送邮件的线程。我怎么知道一个线程已经完成了执行？new Thread(x => SendMail(node.Attributes["id"].Value.ToString(), node["fname"].InnerText +      " " + node["lname"].InnerText, 500, node["email"].InnerText)).Start();

问获取线程状态
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