为什么我无法使用stopwatch.Restart()？

Question

我正在尝试调用Restart()秒表实例,但在尝试调用时遇到以下错误:

资产/脚本/控件/ SuperTouch.cs(22,59):错误CS1061:键入 System.Diagnostics.Stopwatch' does not contain a definition for Restart'并且找不到扩展方法Restart' of type System.Diagnostics.Stopwatch'(您是否缺少using指令或程序集引用？)

这是我的代码:

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

namespace Controls
{

    public class SuperTouch
    {
            public Vector2 position { get { return points [points.Count - 1]; } }
            public float duration { get { return (float)stopwatch.ElapsedMilliseconds; } }
            public float distance;
            public List<Vector2> points = new List<Vector2> ();

            public Stopwatch stopwatch = new Stopwatch ();

            public void Reset ()
            {
                    points.Clear ();
                    distance = 0;
                    stopwatch.Restart ();
            }
    }
}

Answer 1

我猜你使用pre 4.0框架,这意味着你将不得不使用Reset而Start不是Restart.

Answer 2

我猜你正在使用.Net Framework 3.5或低于不存在的Restart方法Stopwatch.

如果要复制相同的行为,可以这样做.

Stopwatch watch = new Stopwatch();
watch.Start();
// do some things here
// output the elapse if needed
watch = Stopwatch.StartNew(); // creates a new Stopwatch instance 
                              // and starts it upon creation

StartNew静态方法已经存在 .Net Framework 2.0

有关StartNew方法的更多详细信息,请参见:Stopwatch.StartNew方法

或者,您也可以为自己创建扩展方法.

这是一个模型和用法.

public static class ExtensionMethods
{
    public static void Restart(this Stopwatch watch)
    {
        watch.Stop();
        watch.Start();
    }
}

消费就好

class Program
{
    static void Main(string[] args)
    {
        Stopwatch watch = new Stopwatch();
        watch.Restart(); // an extension method
    }
}