C#如何使用QueryPerformanceCounter设计一个类实现循环1ms控制台输出一行数据
时间: 2024-09-26 21:17:22 浏览: 16
在C#中,可以利用`System.Diagnostics.PerformanceCounter`类配合`QueryPerformanceFrequency`和`QueryPerformanceCounter`方法来实现高精度的时间测量,并结合`Thread.Sleep`函数来实现大约每1毫秒一次的输出。首先,你需要创建一个表示性能计数器的实例,然后设置频率以便于单位转换。接下来是一个简单的类示例:
```csharp
using System;
using System.Threading;
public class HighPrecisionTimer
{
private static PerformanceCounter counter = new PerformanceCounter("Processor", "% Processor Time", "_Total");
private const int SleepIntervalMicroseconds = 1000; // 约等于1ms
public void Start()
{
QueryPerformanceFrequency(ref frequency);
long startTick = GetTickCount64();
while (true)
{
double elapsedMilliseconds = (double)(GetTickCount64() - startTick) / frequency.Value * 1000;
counter.NextValue(); // 更新计数器值
Console.WriteLine($"Elapsed time: {elapsedMilliseconds} ms");
if (elapsedMilliseconds >= 1)
{
Thread.Sleep(SleepIntervalMicroseconds); // 控制输出间隔
elapsedMilliseconds -= 1;
}
}
}
[DllImport("kernel32.dll", SetLastError = true)]
private static extern bool QueryPerformanceFrequency(ref long lpFrequency);
[DllImport("kernel32.dll")]
private static extern uint GetTickCount64();
private static readonly long frequency; // 计算性能频率
}
public static class Program
{
public static void Main(string[] args)
{
var timer = new HighPrecisionTimer();
timer.Start();
}
}
```
这个`HighPrecisionTimer`类会持续运行并每隔1毫秒输出当前处理器时间百分比。注意,精确度受限于硬件性能计数器的刷新速率,而且长时间运行可能会对系统性能造成一定影响。