// 定义计时器对象
1 public class CountDown
2 {
3
4 private static CountDown theCountDown = null;
5 private static readonly object _padLock = new object(); // unique object for lock
6
7 private Timer timer = null; //计时器
8 private int dt;
9
10 /// <summary>
11 /// decide logic
12 /// </summary>
13 public int DT
14 {
15 get;
16 set;
17 }
18
19 private CountDown ()
20 {
21 timer = new Timer();
22 timer.Interval = 60000; // 1 min to elapsed
23 dt = 0;
24 DT = 0;
25 timer.Elapsed += timer_Elapsed;
26 }
27
28 private void timer_Elapsed(object sender, ElapsedEventArgs e)
29 {
30 dt--;
31 if (dt<=0)
32 {
33 timer.Stop();
34 }
35 DT = dt; // update DT for logic
36 }
37
38
39 /// <summary>
40 /// start timer by using param to set times of loop
41 /// </summary>
42 /// <param name="times"></param>
43 public void Start(int times)
44 {
45 if (dt <=0)
46 {
47 dt = times;
48 timer.Start();
49 }
50
51 }
52
53 /// <summary>
54 /// start timer 60 times loop as default
55 /// </summary>
56 public void Start()
57 {
58 if (dt <= 0)
59 {
60 dt = 60;
61 timer.Start();
62 }
63
64 }
65
66 /// <summary>
67 /// stop timer
68 /// </summary>
69 public void Stop()
70 {
71 timer.Stop();
72 }
73
74 /// <summary>
75 /// 实例化定时器
76 /// </summary>
77 /// <returns></returns>
78 public static CountDown Instance()
79 {
80 //判定对象是否实例化
81 if (null == theCountDown)
82 {
83 lock (_padLock)// 添加线程锁
84 {
85 if (null == theCountDown)
86 {
87 theCountDown = new CountDown();
88 }
89 }
90
91 }
92 return theCountDown;
93 }
94 }
1 //实例化对象
2 CountDown cd = CountDown.Instance();
3 if (cd.DT <= 0)
4 {
7
8 // TODO Something：
9
10 cd.Start(60); //开始计时，设定循环次数（1小时后，才可以再次调用该逻辑）
11 }
