你可以定义一个方法来构建复合字符串键 在任何你想要使用字典的地方，你都必须使用这个方法来构建你的键 例如:

private string keyBuilder(int key1, int key2)
{
    return string.Format("{0}/{1}", key1, key2);
}

使用:

myDict.ContainsKey(keyBuilder(key1, key2))

如果同时使用字符串作为键和值，则可以使用System.Collections.Specialized。它将通过GetValues(string key)方法返回一个字符串值数组。

当使用List<KeyValuePair<string, object>>选项时，你可以使用LINQ来进行搜索:

List<KeyValuePair<string, object>> myList = new List<KeyValuePair<string, object>>();
//fill it here
var q = from a in myList Where a.Key.Equals("somevalue") Select a.Value
if(q.Count() > 0){ //you've got your value }

你可以添加相同的键与不同的情况，如:

key1 Key1 KEY1 KeY1 kEy1 keY1

我知道这是个愚蠢的答案，但对我来说很管用。

我认为List<KeyValuePair<object object>>可以完成任务。

你可以创建自己的字典包装器，就像这样，作为奖励，它支持空值作为键:

/// <summary>
/// Dictionary which supports duplicates and null entries
/// </summary>
/// <typeparam name="TKey">Type of key</typeparam>
/// <typeparam name="TValue">Type of items</typeparam>
public class OpenDictionary<TKey, TValue>
{
    private readonly Lazy<List<TValue>> _nullStorage = new Lazy<List<TValue>>(
        () => new List<TValue>());

    private readonly Dictionary<TKey, List<TValue>> _innerDictionary =
        new Dictionary<TKey, List<TValue>>();

    /// <summary>
    /// Get all entries
    /// </summary>
    public IEnumerable<TValue> Values =>
        _innerDictionary.Values
            .SelectMany(x => x)
            .Concat(_nullStorage.Value);

    /// <summary>
    /// Add an item
    /// </summary>
    public OpenDictionary<TKey, TValue> Add(TKey key, TValue item)
    {
        if (ReferenceEquals(key, null))
            _nullStorage.Value.Add(item);
        else
        {
            if (!_innerDictionary.ContainsKey(key))
                _innerDictionary.Add(key, new List<TValue>());

            _innerDictionary[key].Add(item);
        }

        return this;
    }

    /// <summary>
    /// Remove an entry by key
    /// </summary>
    public OpenDictionary<TKey, TValue> RemoveEntryByKey(TKey key, TValue entry)
    {
        if (ReferenceEquals(key, null))
        {
            int targetIdx = _nullStorage.Value.FindIndex(x => x.Equals(entry));
            if (targetIdx < 0)
                return this;

            _nullStorage.Value.RemoveAt(targetIdx);
        }
        else
        {
            if (!_innerDictionary.ContainsKey(key))
                return this;

            List<TValue> targetChain = _innerDictionary[key];
            if (targetChain.Count == 0)
                return this;

            int targetIdx = targetChain.FindIndex(x => x.Equals(entry));
            if (targetIdx < 0)
                return this;

            targetChain.RemoveAt(targetIdx);
        }

        return this;
    }

    /// <summary>
    /// Remove all entries by key
    /// </summary>
    public OpenDictionary<TKey, TValue> RemoveAllEntriesByKey(TKey key)
    {
        if (ReferenceEquals(key, null))
        {
            if (_nullStorage.IsValueCreated)
                _nullStorage.Value.Clear();
        }       
        else
        {
            if (_innerDictionary.ContainsKey(key))
                _innerDictionary[key].Clear();
        }

        return this;
    }

    /// <summary>
    /// Try get entries by key
    /// </summary>
    public bool TryGetEntries(TKey key, out IReadOnlyList<TValue> entries)
    {
        entries = null;

        if (ReferenceEquals(key, null))
        {
            if (_nullStorage.IsValueCreated)
            {
                entries = _nullStorage.Value;
                return true;
            }
            else return false;
        }
        else
        {
            if (_innerDictionary.ContainsKey(key))
            {
                entries = _innerDictionary[key];
                return true;
            }
            else return false;
        }
    }
}

用法示例:

var dictionary = new OpenDictionary<string, int>();
dictionary.Add("1", 1); 
// The next line won't throw an exception; 
dictionary.Add("1", 2);

dictionary.TryGetEntries("1", out List<int> result); 
// result is { 1, 2 }

dictionary.Add(null, 42);
dictionary.Add(null, 24);
dictionary.TryGetEntries(null, out List<int> result); 
// result is { 42, 24 }