C#异常处理性能测试

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。