方法一：System.Diagnostics.Stopwatch【相对方法二精度更高，也更稳定些】

using System;namespace ConsoleApp1
{class Program{static void Main(string[] args){for (int i = 0; i < 20; i++){double result = delayUs(0.005);//延时0.005ms,即5usConsole.WriteLine(result);}Console.ReadLine();}/// <summary>///  微秒延时/// </summary>/// <param name="time">延时时间,单位:ms</param>/// <returns></returns>public static double delayUs(double time){System.Diagnostics.Stopwatch stopTime = new System.Diagnostics.Stopwatch();stopTime.Start();while (stopTime.Elapsed.TotalMilliseconds < time) { }stopTime.Stop();return stopTime.Elapsed.TotalMilliseconds;}}
}

运行结果：【我又测试了1000次，后边基本可以稳定在0.005(还是比较稳的)】

方法二：调用WIN API中的QueryPerformanceCounter

1、延时5us时，精度很差

using System;
using System.Runtime.InteropServices;namespace ConsoleApp1
{class Program{static void Main(string[] args){System.Diagnostics.Stopwatch stopTime = new System.Diagnostics.Stopwatch();stopTime.Start();for (int i = 0; i < 20; i++){delayUs(5);//延时即5us,0.005msConsole.WriteLine(stopTime.Elapsed.TotalMilliseconds);}Console.WriteLine("测试结束");Console.ReadLine();}[DllImport("kernel32.dll")]extern static short QueryPerformanceCounter(ref long x);[DllImport("kernel32.dll")]extern static short QueryPerformanceFrequency(ref long x);/// <summary>/// 微秒延时/// </summary>/// <param name="delay_Time">延时时间,单位:us</param>public static void delayUs(long delay_Time){long stop_Value = 0;long start_Value = 0;long freq = 0;long n = 0;QueryPerformanceFrequency(ref freq);  //获取CPU频率long count = delay_Time * freq / 1000000;   //这里写成1000000就是微秒，写成1000就是毫秒QueryPerformanceCounter(ref start_Value); //获取初始前值while (n < count) //不能精确判定{QueryPerformanceCounter(ref stop_Value);//获取终止变量值n = stop_Value - start_Value;}}}
}

运行结果【延时5us时】：

2、延时500us时，精度高些

500us延时下，进一步研究：

500us延时下，分别延时1s、2s、4s、5s、10s、20s、40s、60s、120s、240s。测试源码如下：

using System;
using System.Runtime.InteropServices;
using System.Diagnostics;namespace ConsoleApp1
{class Program{static void Main(string[] args){Stopwatch stopTime = new Stopwatch();stopTime.Start();//【01】总用时1sfor (int i = 0; i < 2000; i++){delayUs(500);//延时即5us,0.005ms}Console.WriteLine(stopTime.Elapsed.TotalMilliseconds);stopTime.Stop();//【02】总用时2sstopTime = new Stopwatch();stopTime.Start();          for (int i = 0; i < 4000; i++){delayUs(500);//延时即5us,0.005ms}Console.WriteLine(stopTime.Elapsed.TotalMilliseconds);stopTime.Stop();//【03】总用时3sstopTime = new Stopwatch();stopTime.Start();           for (int i = 0; i < 6000; i++){delayUs(500);//延时即5us,0.005ms}Console.WriteLine(stopTime.Elapsed.TotalMilliseconds);stopTime.Stop();//【04】总用时4sstopTime = new Stopwatch();stopTime.Start();           for (int i = 0; i < 8000; i++){delayUs(500);//延时即5us,0.005ms}Console.WriteLine(stopTime.Elapsed.TotalMilliseconds);stopTime.Stop();//【05】总用时5sstopTime = new Stopwatch();stopTime.Start();           for (int i = 0; i < 10000; i++){delayUs(500);//延时即5us,0.005ms}Console.WriteLine(stopTime.Elapsed.TotalMilliseconds);stopTime.Stop();//【06】总用时10sstopTime = new Stopwatch();stopTime.Start();         for (int i = 0; i < 20000; i++){delayUs(500);//延时即5us,0.005ms}Console.WriteLine(stopTime.Elapsed.TotalMilliseconds);stopTime.Stop();//【07】总用时20sstopTime = new Stopwatch();stopTime.Start();         for (int i = 0; i < 40000; i++){delayUs(500);//延时即5us,0.005ms}Console.WriteLine(stopTime.Elapsed.TotalMilliseconds);stopTime.Stop();//【08】总用时40sstopTime = new Stopwatch();stopTime.Start();       for (int i = 0; i < 80000; i++){delayUs(500);//延时即5us,0.005ms}Console.WriteLine(stopTime.Elapsed.TotalMilliseconds);stopTime.Stop();//【09】总用时60sstopTime = new Stopwatch();stopTime.Start();      for (int i = 0; i < 120000; i++){delayUs(500);//延时即5us,0.005ms}Console.WriteLine(stopTime.Elapsed.TotalMilliseconds);stopTime.Stop();//【10】总用时120sstopTime = new Stopwatch();stopTime.Start();       for (int i = 0; i < 240000; i++){delayUs(500);//延时即5us,0.005ms}Console.WriteLine(stopTime.Elapsed.TotalMilliseconds);stopTime.Stop();Console.WriteLine("测试结束");Console.ReadLine();}[DllImport("kernel32.dll")]extern static short QueryPerformanceCounter(ref long x);[DllImport("kernel32.dll")]extern static short QueryPerformanceFrequency(ref long x);/// <summary>/// 微秒延时/// </summary>/// <param name="delay_Time">延时时间,单位:us</param>public static void delayUs(long delay_Time){long stop_Value = 0;long start_Value = 0;long freq = 0;long n = 0;QueryPerformanceFrequency(ref freq);  //获取CPU频率long count = delay_Time * freq / 1000000;   //这里写成1000000就是微秒，写成1000就是毫秒QueryPerformanceCounter(ref start_Value); //获取初始前值while (n < count) //不能精确判定{QueryPerformanceCounter(ref stop_Value);//获取终止变量值n = stop_Value - start_Value;}}}
}

多次运行结果如下：

对于测试结果1进行分析：

跑1min相差50000us，共120000个循环，每个循环（500us）相差0.417us（50000÷120000=0.417）
跑2min相差111000us，共240000个循环，每个循环（500us）相差0.4625us（111000÷240000=0.4625）

结论：【500us的延时，相对来说还是很准的】

方法三：DateTime.Ticks【延时效果最差】

DateTime.Ticks：表示0001 年 1 月 1 日午夜 12:00:00 以来所经历的 100 纳秒数，即Ticks的属性为100纳秒（1Ticks = 0.0001毫秒）。

//延时，单位：微妙uspublic static void delay(long t){long b = DateTime.Now.Ticks / 10;long e = 0; long c = 0; ;do{e = DateTime.Now.Ticks / 10;c = e - b;               }while (c < t);}

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