<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();
}
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