|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
<br> //定义一个委托
public
delegate int DoSomething(int
count);
//BeginInvoke 的回调函数
private
static void Execute(IAsyncResult async)
{
DoSomething temp = (DoSomething)async.AsyncState;
int
sum = temp.EndInvoke(async);
Console.WriteLine("线程结束：值为"
+ sum);
}
/// <summary>
/// 判断输入的整数是不是素数
/// </summary>
/// <param name="candidate">输入的整数</param>
/// <returns>为素数返回true,否则返回false</returns>
public
static bool IsPrime(int
candidate)
{
bool
retVal = true;
//使用递增方式会更有效率，
//但是在演示取消功能时，使用递减的数字会更好。
//for (int i = 2; i < candidate / 2; i++)
for
(int
i = candidate / 2 + 1; i > 1; i--)
{
if
(candidate % i == 0)
{
retVal = false;
break;
}
}
return
retVal;
}
private
static int maseggs(int
count)
{
int
result = 0;
for
(int
index = 0; index < count; index++)
{
if
(IsPrime(index + 1))
{
result++;
}
}
return
result;
}
static
void Main(string[] args)
{
DoSomething hidands = new
DoSomething(maseggs);
IAsyncResult async = hidands.BeginInvoke(100000, new
AsyncCallback(Execute), hidands);
//这里还有100行代码
Console.WriteLine("消息获取成功");
Console.ReadLine();
}
|