核实。
static public void Main(string[] args)
{
Stopwatch w = new Stopwatch();
double d = 0;
w.Start();
for (int i = 0; i < 10000000; i++)
{
try
{
d = Math.Sin(1);
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
}
w.Stop();
Console.WriteLine(w.Elapsed);
w.Reset();
w.Start();
for (int i = 0; i < 10000000; i++)
{
d = Math.Sin(1);
}
w.Stop();
Console.WriteLine(w.Elapsed);
}
输出：
00:00:00.4269033 // with try/catch
00:00:00.4260383 // without.
以毫秒为单位：
449
416
新代码：
for (int j = 0; j < 10; j++)
{
Stopwatch w = new Stopwatch();
double d = 0;
w.Start();
for (int i = 0; i < 10000000; i++)
{
try
{
d = Math.Sin(d);
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
finally
{
d = Math.Sin(d);
}
}
w.Stop();
Console.Write(" try/catch/finally: ");
Console.WriteLine(w.ElapsedMilliseconds);
w.Reset();
d = 0;
w.Start();
for (int i = 0; i < 10000000; i++)
{
d = Math.Sin(d);
d = Math.Sin(d);
}
w.Stop();
Console.Write("No try/catch/finally: ");
Console.WriteLine(w.ElapsedMilliseconds);
Console.WriteLine();
}
新结果：
try/catch/finally: 382
No try/catch/finally: 332
try/catch/finally: 375
No try/catch/finally: 332
try/catch/finally: 376
No try/catch/finally: 333
try/catch/finally: 375
No try/catch/finally: 330
try/catch/finally: 373
No try/catch/finally: 329
try/catch/finally: 373
No try/catch/finally: 330
try/catch/finally: 373
No try/catch/finally: 352
try/catch/finally: 374
No try/catch/finally: 331
try/catch/finally: 380
No try/catch/finally: 329
try/catch/finally: 374
No try/catch/finally: 334
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