C＃中For循环的时间延迟 [英] Time delay in For loop in c#
问题描述
在特定旋转后如何在循环中使用时间延迟？
假设：
how can i use a time delay in a loop after certain rotation? Suppose:
for(int i = 0 ; i<64;i++)
{
........
}
我希望延迟1秒每8圈。
i want 1 sec delay after each 8 rotation.
推荐答案
有很多方法可以做到：
-
方法一：犯罪可怕：繁忙等待：
Method one: Criminally awful: Busy-wait:
DateTime timeToStartUpAgain =什么；
while（DateTime.Now< timeToStartUpAgain）{}
这是一件可怕的事情；操作系统将假定您正在做有用的工作，并且将分配CPU来执行此操作。除非您知道旋转只会持续几微秒，否则不要执行 。基本上，当您这样做时，您已经雇用了某人为您计时。
This is a horrible thing to do; the operating system will assume that you are doing useful work and will assign a CPU to do nothing other than spinning on this. Never do this unless you know that the spin will be only for a few microseconds. Basically when you do this you've hired someone to watch the clock for you; that's not economical.
- 方法二：太糟糕了：休眠线程。
休眠线程也是一件可怕的事情，但没有比加热CPU可怕的了。休眠线程会告诉操作系统此应用程序的此线程应暂时停止响应事件，并且不执行任何操作。这比雇用某人为您看时钟要好。现在您已经雇用了某人为您睡觉。
Sleeping a thread is also a horrible thing to do, but less horrible than heating up a CPU. Sleeping a thread tells the operating system "this thread of this application should stop responding to events for a while and do nothing". This is better than hiring someone to watch a clock for you; now you've hired someone to sleep for you.
- 方法三：将工作分解为较小的任务。创建一个计时器。当您需要延迟时，而不是执行下一个任务，请创建一个计时器。当计时器触发其滴答事件时，从上次中断的任务列表中选取。
这可以有效利用资源；现在您正在雇用某人来煮鸡蛋，并且在煮鸡蛋的同时，它们还可以烤面包。
This makes efficient use of resources; now you are hiring someone to cook eggs and while the eggs are cooking, they can be making toast.
但是编写程序以使其分解却很痛苦
However it is a pain to write your program so that it breaks up work into small tasks.
- 方法四：使用C＃5对异步编程的支持； 等待Delay任务，然后让C＃编译器负责重组程序以使其高效。
- Method four: use C# 5's support for asynchronous programming; await the Delay task and let the C# compiler take care of restructuring your program to make it efficient.
不利的一面当然是C＃5目前仅在beta中。
The down side of that is of course C# 5 is only in beta right now.
注意：从Visual Studio 2012开始，C＃5已在使用中。如果您使用的是VS 2012或更高版本，则可以使用异步编程。
NOTE: As of Visual Studio 2012 C# 5 is in use. If you are using VS 2012 or later async programming is available to you.
这篇关于C＃中For循环的时间延迟的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
