是否有实现我的自定义方法的属性的简写？

问题描述

public class ServerState
{
    public static Action stateChanged;
    private string currentMap;

    public string CurrentMap
    {
        get { return currentMap; }
        set
        {
            currentMap = value;
            stateChanged?.Invoke();
        }
    }
}

我有一个包含数十个变量的类，每个变量都需要自己的属性，以便我可以调用操作。换句话说，我将重复上述代码数十次，并且我认为应该有更好的方法。

上面的代码有简写吗？

解决方法

这里有两个想法：

using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;

namespace ConsoleApp1
{
    public class ServerState
    {
        public static Action stateChanged;

        private Dictionary<string,object> _values = new Dictionary<string,object>();
        private void Set(object value,[CallerMemberName] string propertyName = null)
        {
            _values[propertyName] = value;
            stateChanged?.Invoke();
        }

        private T Get<T>([CallerMemberName] string propertyName = null)
        {
            if (_values.TryGetValue(propertyName,out var v)) return (T)v;
            throw new KeyNotFoundException(propertyName);
        }

        public string CurrentMap 
        { 
            get => Get<string>(); 
            set => Set(value); 
        }

        // You can make them in one line if you want
        public string CurrentMap2 { get => Get<string>(); set => Set(value); }
    }

    public class ServerState2
    {
        public static Action stateChanged;
        private string currentMap;

        private void Set<T>(ref T property,T value)
        {
            property = value;
            stateChanged?.Invoke();
        }

        public string CurrentMap
        {
            get => currentMap;
            set => Set(ref currentMap,value);
        }
    }
}

如果您要使用多个事件，或者跟踪值是否实际更改，则可以扩展此想法：

public class ServerState
{
    public static Action currentMapChanged;
    public static Action currentMap2Changed;
    private Dictionary<string,object>();
    private void Set(object value,Action onChange,[CallerMemberName] string propertyName = null)
    {
        var previousValue = _values[propertyName];
        // Check if value has changed
        if (value != previousValue)
        {
            _values[propertyName] = value;
            onChange?.Invoke();
        }
    }

    private T Get<T>([CallerMemberName] string propertyName = null)
    {
        if (_values.TryGetValue(propertyName,out var v)) return (T)v;
        throw new KeyNotFoundException(propertyName);
    }

    public string CurrentMap 
    { 
        get => Get<string>(); 
        // Call `currentMapChanged` if value differs
        set => Set(value,currentMapChanged); 
    }

    // You can make them in one line if you want
    // Call `currentMap2Changed` if value differs
    public string CurrentMap2 { get => Get<string>(); set => Set(value,currentMap2Changed); }
}

此外，您应该研究使用event关键字来阻止其他类触发此事件。还要注意静态事件，它们在静态上下文中拥有对侦听委托的引用，并且需要格外小心以避免内存泄漏。

c#c#class-variables shorthand