不抛出异常时，try / catch块是否会损害性能？

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/catch00:00:00.4260383  // without.

以毫秒为单位：

449416

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: 382No try/catch/finally: 332   try/catch/finally: 375No try/catch/finally: 332   try/catch/finally: 376No try/catch/finally: 333   try/catch/finally: 375No try/catch/finally: 330   try/catch/finally: 373No try/catch/finally: 329   try/catch/finally: 373No try/catch/finally: 330   try/catch/finally: 373No try/catch/finally: 352   try/catch/finally: 374No try/catch/finally: 331   try/catch/finally: 380No try/catch/finally: 329   try/catch/finally: 374No try/catch/finally: 334