异常处理性能测试
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks; namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
int cnt = ;
StringBuilder sb = new StringBuilder();
string msg = "";
Stopwatch w = new Stopwatch();
w.Start();
int a = ;
for (int i = ; i <= cnt; i++)
{
Int32.TryParse("a", out a);
} w.Stop();
msg = string.Format("Int32.TryParse {0}次:{1}毫秒", cnt, w.ElapsedMilliseconds);
sb.AppendLine(msg); w.Reset();
w.Start();
for (int i = ; i <= cnt; i++)
{
try
{
int a2 = ;
}
catch (Exception e)
{ }
finally
{ } } w.Stop(); msg = string.Format("try catch中执行 a2 = 1 {0}次:{1}毫秒", cnt, w.ElapsedMilliseconds);
sb.AppendLine(msg); w.Reset();
w.Start();
for (int i = ; i <= cnt; i++)
{
try
{
Int32.TryParse("a", out a);
}
catch (Exception e)
{ }
finally
{ }
} w.Stop();
msg = string.Format("try catch中执行 Int32.TryParse无异常 {0}次:{1}毫秒", cnt, w.ElapsedMilliseconds);
sb.AppendLine(msg); w.Reset();
w.Start();
for (int i = ; i <= cnt; i++)
{
try
{
Int32.Parse("a");
}
catch (Exception e)
{ }
finally
{ }
} w.Stop(); msg = string.Format("try catch中执行 Int32.Parse有抛异常{0}次:{1}毫秒", cnt, w.ElapsedMilliseconds);
sb.AppendLine(msg); w.Reset();
w.Start();
for (int i = ; i <= cnt; i++)
{
try
{
throw new Exception("");
}
catch (Exception e)
{ }
finally
{ }
} w.Stop();
msg = string.Format("try catch中执行 throw new Exception有抛异常{0}次:{1}毫秒", cnt, w.ElapsedMilliseconds);
sb.AppendLine(msg); Console.WriteLine(sb.ToString()); Console.Read();
}
}
}
输出结果:
Int32.TryParse 1000次:0毫秒
try catch中执行 a2 = 1 1000次:0毫秒
try catch中执行 Int32.TryParse无异常 1000次:0毫秒
try catch中执行 Int32.Parse有抛异常1000次:6276毫秒
try catch中执行 throw new Exception有抛异常1000次:4904毫秒
结论:
1. C#中使用 TryParse性能较好。
2. 一次异常处理大约耗时5毫秒。