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最新推荐文章于 2025-08-13 17:52:54 发布

原创最新推荐文章于 2025-08-13 17:52:54 发布 · 388 阅读

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#action #string #class #测试

本文介绍了一个使用C#编写的性能测试工具，该工具通过调整进程优先级、收集垃圾回收次数及CPU周期等手段，对字符串拼接操作进行了性能对比测试，包括使用字符串连接与StringBuilder方法。

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全部代码如下

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Diagnostics; using System.Threading; using System.Runtime.InteropServices; namespace ConsoleApplication1 { public static class CodeTimer { public static void Initialize() { Process.GetCurrentProcess().PriorityClass = ProcessPriorityClass.High; Thread.CurrentThread.Priority = ThreadPriority.Highest; } public static void Time(String name, int interation, Action action) { ConsoleColor currentForeColor = Console.ForegroundColor; Console.ForegroundColor = ConsoleColor.Yellow; Console.WriteLine(name); GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced); Int32[] gcCounts = new Int32[GC.MaxGeneration + 1]; for (Int32 Incremental = 0; Incremental < gcCounts.Length; Incremental++) gcCounts[Incremental] = GC.CollectionCount(Incremental); Stopwatch watch = new Stopwatch(); watch.Start(); Int64 CycleCount = GetCycleCount(); for (Int32 Incremental = 0; Incremental < interation; Incremental++) action(); Int64 cpuCycles = GetCycleCount() - CycleCount; watch.Stop(); Console.ForegroundColor = currentForeColor; Console.WriteLine("/t执行时间:/t"+watch.ElapsedMilliseconds.ToString()+"毫秒"); Console.WriteLine("/tCPU时钟周期:/t"+cpuCycles.ToString()); for (Int32 Incremental = 0; Incremental < GC.MaxGeneration; Incremental++) { Int32 count = GC.CollectionCount(Incremental) - gcCounts[Incremental]; Console.WriteLine("/t"+Incremental+"代回收次数:/t"+count); } } private static Int64 GetCycleCount() { Int64 n,kerneltime,usertime; GetThreadTimes(GetCurrentThread(), out n,out n,out kerneltime,out usertime); return kerneltime+usertime; } [DllImport("kernel32.dll",SetLastError=true)] static extern bool GetThreadTimes(IntPtr hThread, out long lpCreationTime, out long lpExitTime, out long lpKernelTime, out long longlpUserTime); [DllImport("kernel32.dll")] static extern IntPtr GetCurrentThread(); } }

(本想疯狂点循环10亿次..结果死机..)

如下测试:

           CodeTimer.Initialize();

            String strTestOne = String.Empty;

            CodeTimer.Time("String Concat", 100000, () => { strTestOne+="a"; });

            StringBuilder strTestTwo = new StringBuilder(100000);

            CodeTimer.Time("StringBuilder", 100000, () => { strTestTwo.Append("a"); });