ConditionalWeakTable<TKey, TValue>使编译器可以将对象字段动态附加到托管对象。

最新推荐文章于 2024-04-25 09:29:49 发布

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最新推荐文章于 2024-04-25 09:29:49 发布 · 1.7k 阅读

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#ConditionalWeakTable

ConditionalWeakTable<TKey, TValue> 类允许编译器在运行时为托管对象添加属性，作为键值对的字典，但不保留键且不完全符合常规字典行为。它确保键的唯一性，并且键仅因对象存在而存在。" 126801940,1409232,国民MCU MCO模块分析：PLL与HSI稳定性对比,"['mcu', '单片机', 'stm32', 'PLL', '晶体']

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MSDN关于它的介绍：https://msdn.microsoft.com/zh-cn/library/dd287757(v=vs.100).aspx

先看一个小demo：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 
using System.Runtime.CompilerServices;
 
namespace ExtensionProps
{
    public class Person
    {
 
    }

    public class SomeClass
    {
 
    }

    public class ExtraPersonProps
    {
        public int Age { get; private set; }
        public string Name { get; private set; }
 

        public ExtraPersonProps(int age, string name)
        {
            Age = age;
            Name = name;
        }
    }
 
    class Program
    {
        static void Main(string[] args)
        { 
            Console.WriteLine("=========Using Fixed Data==========\r\n");
 
            //demo with fixed data
            ConditionalWeakTable<Person, ExtraPersonProps> cwtPerson =
                new ConditionalWeakTable<Person, ExtraPersonProps>();
            Person p = new Person();
            cwtPerson.Add(p, new ExtraPersonProps(1,"demoPerson"));
            ExtraPersonProps props;
            if (cwtPerson.TryGetValue(p, out props))
                Console.WriteLine(string.Format("value of Person is : Age {0}, Name: {1}",
                    props.Age, props.Name));
 
            Console.WriteLine("=========Using Dictionary==========\r\n");
 
            //demo with Dictonary data
            ConditionalWeakTable<Person, Dictionary<string, object>> cwtPerson2 =
                new ConditionalWeakTable<Person, Dictionary<string, object>>();
            Person p2 = new Person();
            Dictionary<string, object> data = new Dictionary<string, object>();
            data.Add("age", 2);
            data.Add("name", "demoPerson2");
            cwtPerson2.Add(p2, data);
            Dictionary<string, object> dataRetrieved;
            if (cwtPerson2.TryGetValue(p2, out dataRetrieved))