我当前有一个菜单,其中包含存储在此字典变量中的子项:

private Dictionary<string, UserControl> _leftSubMenuItems 
    = new Dictionary<string, UserControl>();

因此,我向“客户”部分添加如下视图:

_leftSubMenuItems.Add("customers", container.Resolve<EditCustomer>());
_leftSubMenuItems.Add("customers", container.Resolve<CustomerReports>());

但是因为我在用字典, 我只能有一把名为“客户”的钥匙 .

我的自然倾向是 自定义结构 具有属性“section”和“view”,但是 有没有一个.NET集合更适合这个任务,比如“multikeydictionary”?

答:

感谢麦基考,我扩大了你的建议,以得到我所需要的:

using System;
using System.Collections.Generic;

namespace TestMultiValueDictionary
{
    class Program
    {
        static void Main(string[] args)
        {
            MultiValueDictionary<string, object> leftSubMenuItems = new MultiValueDictionary<string, object>();

            leftSubMenuItems.Add("customers", "customers-view1");
            leftSubMenuItems.Add("customers", "customers-view2");
            leftSubMenuItems.Add("customers", "customers-view3");
            leftSubMenuItems.Add("employees", "employees-view1");
            leftSubMenuItems.Add("employees", "employees-view2");

            foreach (var leftSubMenuItem in leftSubMenuItems.GetValues("customers"))
            {
                Console.WriteLine(leftSubMenuItem);
            }

            Console.WriteLine("---");

            foreach (var leftSubMenuItem in leftSubMenuItems.GetAllValues())
            {
                Console.WriteLine(leftSubMenuItem);
            }

            Console.ReadLine();
        }
    }

    public class MultiValueDictionary<TKey, TValue> : Dictionary<TKey, List<TValue>>
    {

        public void Add(TKey key, TValue value)
        {
            if (!ContainsKey(key))
                Add(key, new List<TValue>());
            this[key].Add(value);
        }

        public List<TValue> GetValues(TKey key)
        {
            return this[key];
        }

        public List<TValue> GetAllValues()
        {
            List<TValue> list = new List<TValue>();

            foreach (TKey key in this.Keys)
            {
                List<TValue> values = this.GetValues(key);
                list.AddRange(values);
            }

            return list;
        }
    }

}

答案2:

感谢blixt提供有关yield的提示,下面是getAllValues的更改:

public IEnumerable<TValue> GetAllValues()
{
    foreach (TKey key in this.Keys)
    {
        List<TValue> values = this.GetValuesForKey(key);
        foreach (var value in values)
        {
            yield return value;
        }
    }
}

答案2进一步重构:

这里有一个更简洁的方法来做同样的事情,谢谢基思:

public IEnumerable<TValue> GetAllValues()
{
    foreach (var keyValPair in this)
        foreach (var val in keyValPair.Value)
            yield return val;
}