C#可空类型的速度和GC Alloc测试

在Unity中进行速度和GC Alloc的测试

测试脚本：

using UnityEngine;
using System;
using System.Collections;
using System.Diagnostics;

public class NullableTest : MonoBehaviour
{
    void Start()
    {
        Stopwatch stopwatch = new Stopwatch();
        stopwatch.Start();
        for (int i = 0; i < 1000000; i++)
        {
            int a = i;
            //int? a = i;
            a.GetHashCode();
        }
        stopwatch.Stop();

        UnityEngine.Debug.Log("time(ms): " + stopwatch.ElapsedMilliseconds);
    }
}

100万次循环下，可空类型执行速度45ms，非可空类型执行速度12ms

并且没有GC。