多線程(2)Thread

　　我們先從最基礎的Thread說起。

創建並啟動線程

創建並啟動一個線程，如下代碼：

 1 namespace ConsoleApplication17
 2 {
 3     class Program
 4     {
 5         static void Main(string[] args)
 6         {
 7             var thread = new Thread(PrintNumbers);
 8             thread.Start();
 9 
10             Console.WriteLine("Thread Start...");
11             Console.ReadKey();
12         }
13 
14         /// <summary>
15         /// 匹配委托的方法
16         /// </summary>
17         public static void PrintNumbers()
18         {
19             Console.WriteLine("Starting......");
20             for (int i = 0; i < 10; i++)
21             {
22                 Console.WriteLine(i);
23             }
24         }
25     }
26 }

運行結果：

暫停線程

假如需要暫停當前線程，可以調用Thread.Sleep方法，使當前線程處於阻塞狀態，如下代碼：

 1 namespace ConsoleApplication17
 2 {
 3     class Program
 4     {
 5         static void Main(string[] args)
 6         {
 7             var thread = new Thread(PrintNumbersWithDelay);
 8             thread.Start();
 9 
10             Console.WriteLine("Thread Start...");
11             Console.ReadKey();
12         }
13 
14         /// <summary>
15         /// 
16         /// </summary>
17         public static void PrintNumbersWithDelay()
18         {
19             Console.WriteLine("Starting......");
20             for (int i = 0; i < 10; i++)
21             {
22                 Thread.Sleep(TimeSpan.FromMilliseconds(1000));
23                 Console.WriteLine(string.Format("{0}  {1}", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), i));
24             }
25         }
26     }
27 }

輸出結果：

合併線程

如果需要等待某個子線程執行行，主線程才繼續執行時，可以使用Thread.Join方法來實現，如下代碼：

 1 namespace ConsoleApplication17
 2 {
 3     class Program
 4     {
 5         static void Main(string[] args)
 6         {
 7             //Thread
 8             var thread = new Thread(PrintNumbersWithDelay);
 9             thread.Start();
10             thread.Join();
11 
12             Console.WriteLine("Thread Completed!");
13             Console.ReadKey();
14         }
15 
16         /// <summary>
17         /// 
18         /// </summary>
19         public static void PrintNumbersWithDelay()
20         {
21             Console.WriteLine("Starting......");
22             for (int i = 0; i < 10; i++)
23             {
24                 Thread.Sleep(TimeSpan.FromMilliseconds(1000));//線程阻塞1s，此時線程狀態為WaitSleepJoin
25                 Console.WriteLine(string.Format("當前時間：{0}，線程狀態：{1}，結果：{2}", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"),Thread.CurrentThread.ThreadState, i));
26             }
27         }
28     }
29 }

 輸出結果：

終止線程

 如果在子線程運行過程中強制終止它，可以調用Thread.Abort方法，這會給當前子線程觸發ThreadAbortException異常，導致線程被終止！

如下代碼：

 1 namespace ConsoleApplication17
 2 {
 3     class Program
 4     {
 5         static void Main(string[] args)
 6         {
 7             Console.WriteLine("Starting Program...");
 8             var thread = new Thread(PrintNumbersWithDelay);
 9             thread.Start();
10 
11             Thread.Sleep(TimeSpan.FromMilliseconds(6000));
12             thread.Abort();
13 
14             Console.WriteLine("Thread has been abort!");
15             Console.ReadKey();
16         }
17 
18         /// <summary>
19         /// 
20         /// </summary>
21         public static void PrintNumbersWithDelay()
22         {
23             Console.WriteLine("Starting......");
24             for (int i = 0; i < 10; i++)
25             {
26                 Thread.Sleep(TimeSpan.FromMilliseconds(1000));
27                 Console.WriteLine(string.Format("當前時間：{0}，線程狀態：{1}，結果：{2}", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), Thread.CurrentThread.ThreadState, i));
28             }
29         }
30     }
31 }

線程傳遞參數

通過分析可以發現，Thread接受的實際上是一個委托，包括無參數的委托和接受一個Object類型的委托，

如下代碼：

 1 namespace ConsoleApplication17
 2 {
 3     class Program
 4     {
 5         static void Main(string[] args)
 6         {
 7             Console.WriteLine("Main thread starting...");
 8             var thread = new Thread(PrintNumbersWithCount);
 9             thread.Start(5);
10             thread.Join();
11 
12             Console.WriteLine("Main thread completed!");
13             Console.ReadKey();
14         }
15 
16         /// <summary>
17         /// 匹配委托方法，帶參數
18         /// </summary>
19         public static void PrintNumbersWithCount(object obj)
20         {
21             Console.WriteLine("Sub thread starting...");
22             var number = Convert.ToInt32(obj);
23             for (int i = 0; i < number; i++)
24             {
25                 Console.WriteLine(string.Format("當前時間：{0}，線程狀態：{1}，結果：{2}", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), Thread.CurrentThread.ThreadState, i));
26             }
27         }
28     }
29 }

輸出結果：