c# - 从 ArrayList 获取变量的好方法包括不同类型的列表吗？

Question

我正在尝试指定 myObject映射以使用它们的 ID(自动排序)到达我的对象，我创建了 List<T>每一个

编辑:(世界、城市、...)这些对象具有 ComponentID 变量。

public enum ComponentType : byte
{
    Effect,
    Building,
    City,
    Region,
    Country,
    World
}

public static class ComponentMap
{
    public static List<World> Worlds = new List<World>();
    public static List<Country> Countries = new List<Country>();
    public static List<Region> Regions = new List<Region>();
    public static List<City> Cities = new List<City>();
    public static List<Building> Buildings = new List<Building>();
    public static List<Effect> Effects = new List<Effect>();

    public static ArrayList Map = new ArrayList() {
        Effects,
        Buildings,
        Cities,
        Regions,
        Countries,
        Worlds
    };
}

在这里，我正在使用该方法检查我的对象。

private bool CheckExist()
{
    ComponentType type = ComponentType.Country;
    ushort compId = 12;

    return ((List<object>)(ComponentMap.Map[(byte)type]))[compId] == null ? false : true;
}

如你所见，我正在转换 (ComponentMap.Map[(byte)type]) => List(object)因为，我不能使用 Map的变量为 List ，它说“它是一个对象而不是列表”。

这个方法正常还是垃圾？如果您有更好的解决方案，请说明。

Answer 1

对于映射，我建议使用内置的字典和集合，它会更快并且更易读(我想你的实体中有 Id 属性):

public static class ComponentMap
{
    public static List<World> Worlds = new List<World>();
    public static List<Country> Countries = new List<Country>();
    public static List<Region> Regions = new List<Region>();
    public static List<City> Cities = new List<City>();
    public static List<Building> Buildings = new List<Building>();
    public static List<Effect> Effects = new List<Effect>();

    public static IDictionary<ComponentType, ISet<int>> Map = new Dictionary<ComponentType, ISet<int>>() {
        [ComponentType.Effect] = new HashSet<int>(Effects.Select(e => e.Id)),
        // etc
    };
}

private bool CheckExist()
{
    ComponentType type = ComponentType.Country;
    ushort compId = 12;

    return ComponentMap.Map[type].Contains(compId);
}

如果您想保留对实体的引用，您可以使用 C# 7 元组功能执行以下字典操作:

public static class ComponentMap
{
    public static List<World> Worlds = new List<World>();
    public static List<Country> Countries = new List<Country>();
    public static List<Region> Regions = new List<Region>();
    public static List<City> Cities = new List<City>();
    public static List<Building> Buildings = new List<Building>();
    public static List<Effect> Effects = new List<Effect>();

    public static IDictionary<(ComponentType, int), object> Map;

    static ComponentMap()
    {
         var keyValuePars = Worlds
                            .Select(w => new KeyValuePair<(ComponentType, int), object>((ComponentType.World, w.Id), w)))
                            .Concat(); // add other items in concats
         Map = new Dictionary<(ComponentType, int), object>(keyValuePars);
    }
}

private bool CheckExist()
{
    ComponentType type = ComponentType.Country;
    ushort compId = 12;

    return ComponentMap.Map.ContainsKey((type, compId));
}