C# 原始类型扩展方法

例如：给 DateTime 扩展两个转换成毫秒数和从毫秒数转换成 DateTime 的方法。

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using UnityEngine;
using System.Collections;
using System;

public class Test : MonoBehaviour
{
    void Start()
    {
        DateTime date = DateTime.Now;
        Debug.Log("Now = " + date);
        long milliseconds = date.DateTimeToMilliseconds();
        Debug.Log("Milliseconds = " + milliseconds);
        date = date.MillisecondsToDateTime(milliseconds + 1000);
        Debug.Log("date = " + date);
    }
}

public static class DateTimeExtension
{
    /// <summary>
    /// 将当前DateTime转换成毫秒数
    /// </summary>
    public static long DateTimeToMilliseconds(this DateTime date)
    {
        DateTime date_1970 = new DateTime(1970, 1, 1);
        TimeSpan span = date - date_1970;
        return Convert.ToInt64(span.TotalMilliseconds);
    }

    /// <summary>
    /// 将给定的毫秒数转换成DateTime
    /// </summary>
    public static DateTime MillisecondsToDateTime(this DateTime data, long milliseconds)
    {
        DateTime date_1970 = new DateTime(1970, 1, 1);
        return date_1970.AddMilliseconds(milliseconds);
    }
}