C#计算一段程序运行时间的多种方法总结

static void SubTest()
{
	DateTime beforDT = System.DateTime.Now;  

	//耗时巨大的代码
	
	DateTime afterDT = System.DateTime.Now;
	TimeSpan ts = afterDT.Subtract(beforDT);
	Console.WriteLine("DateTime总共花费{0}ms.", ts.TotalMilliseconds);
}

static void SubTest()
{
	Stopwatch sw = new Stopwatch();
	sw.Start();
  
	//耗时巨大的代码
	
	sw.Stop();
	TimeSpan ts2 = sw.Elapsed;
	Console.WriteLine("Stopwatch总共花费{0}ms.", ts2.TotalMilliseconds);
}

[System.Runtime.InteropServices.DllImport("Kernel32.dll")]
static extern bool QueryPerformanceCounter(ref long count);
[System.Runtime.InteropServices.DllImport("Kernel32.dll")]
static extern bool QueryPerformanceFrequency(ref long count);   
static void SubTest()
{
	long count = 0;
	long count1 = 0;
	long freq = 0;
	double result = 0;
	QueryPerformanceFrequency(ref freq);
	QueryPerformanceCounter(ref count);   

	//耗时巨大的代码
	
	QueryPerformanceCounter(ref count1);
	count = count1 - count;
	result = (double)(count) / (double)freq;
	Console.WriteLine("QueryPerformanceCounter耗时: {0} 秒", result);
}

using System;
 
class Program
{
    static void Main()
    {
        DateTime startTime = DateTime.Now;
 
        // 执行你的代码
        for (int i = 0; i < 1000000; i++)
        {
            // 示例：一个简单的循环
        }
 
        DateTime endTime = DateTime.Now;
        TimeSpan executionTime = endTime - startTime;
 
        Console.WriteLine("程序执行时间: " + executionTime.TotalMilliseconds + " 毫秒");
    }
}

using System;
using System.Diagnostics;
 
class Program
{
    static void Main()
    {
        Stopwatch stopwatch = new Stopwatch();
        stopwatch.Start();
 
        // 执行你的代码
        for (int i = 0; i < 1000000; i++)
        {
            // 示例：一个简单的循环
        }
 
        stopwatch.Stop();
        Console.WriteLine("程序执行时间: " + stopwatch.ElapsedMilliseconds + " 毫秒");
    }
}

using System;
 
class Program
{
    static void Main()
    {
        int startTime = Environment.TickCount; // 或使用Environment.TickCount64对于64位系统以避免溢出
 
        // 执行你的代码
        for (int i = 0; i < 1000000; i++)
        {
            // 示例：一个简单的循环
        }
 
        int endTime = Environment.TickCount; // 或使用Environment.TickCount64对于64位系统以避免溢出
        int executionTime = endTime - startTime; // 注意：这将返回以毫秒为单位的整数，但不直接提供TimeSpan对象。
 
        Console.WriteLine("程序执行时间: " + executionTime + " 毫秒");
    }
}