用于双向转换数据的.NET容器？

发布于 2024-08-13 08:28:12 字数 792 浏览 8 评论 0原文

我需要将转换表包含在内存中以便快速访问。到目前为止，我使用了一个简单的Hashtable，其中键是内部代码，值是保存外部代码和其他元数据的对象。

现在我们需要进行反向查找，即根据外部代码来获取内部代码。我只能提出以下选项：

使用另一个容器进行此查找，哈希表仅包含内部代码作为值，以防止更多冗余。
使用我现在使用的相同容器，并使用外部代码作为键再次存储这些对象（有一个前缀以防止冲突）。
不要使用 Key 拉取数据，而是迭代同一容器下包含的 Value 来查找请求的对象（ O(n)，相同的内存使用量）。

容器是延迟加载的，因此选项 1 和 2 在最坏的情况下通常不会执行。

有人想吗？请告诉我有一些我可以使用的高效容器，但我错过了！

* 编辑*

作为一个 GC 框架，并接受我必须有两个转换数组（字典）的事实，下面的代码行实际上意味着我在内存上只存储了一个对象，然后在两个不同的散列单元下有两个指针？

Dictionary<K1,V> forward;
Dictionary<K2,V> reverse;
//...    
void Add(V myObject)
{
    // myObject being the BLL object
    forward.Add(myObject.InternalCode, myObject);
    reverse.Add(myObject.ExternalCode, myObject);
}

伊塔玛。

原文

I have conversion tables I need to contain in memory for fast access. Until now I used a simple Hashtable were the Key was the internal code, and the Value was an object holding the external code and other meta-data.

Now we need to have a reverse look-up, meaning to get the internal code based on the external code. I could only come up with the following options:

Have another container for this look-up, Hashtable containing only the internal code as Value to prevent more redundancy.
Use the same container I use now, and store those objects again now using the the external code as the Key (have a prefix to prevent collisions).
Don't pull data using Keys, but iterate through the Values contained under the same container to find the requested object ( O(n), same memory usage ).

The container is being lazy-loaded, so options 1&2 usually won't perform under the worst-case scenario.

Thoughts anyone? Please tell me there's some efficient container I could use for that, which I missed!

* EDIT *

Being a GC'd framework, and accepting the fact I'd have to have two conversion arrays (Dictionaries), would the following lines of code actually mean I stored only one object on memory, and then two pointers for it, under two different hashed-cells?

Dictionary<K1,V> forward;
Dictionary<K2,V> reverse;
//...    
void Add(V myObject)
{
    // myObject being the BLL object
    forward.Add(myObject.InternalCode, myObject);
    reverse.Add(myObject.ExternalCode, myObject);
}

Itamar.

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风轻花落早 2024-08-20 08:28:12

构建一个自定义集合类，该类具有两个内部哈希表（字典），每个方向一个。

  public BiHashTable<K, V>
  {
     private Dictionary<K, V> vals = new Dictionary<K, V>();
     private Dictionary<V, K> keys = new Dictionary<V, K>();
     public void Add(K key, V val)
     {
        vals.Add(key, val);
        keys.Add(val, key);
     }
     public K this[v val] { get { return keys[val]; } }
     public V this[K key] { get { return vals[key]; } }
     // etc... 
  }

注意：这将是有问题的，因为 K 和 V 都是同一类型，那么您需要不同的公式......

Build a custom collection class that has two internal hashtables (Dictionarys), one in each direction.

  public BiHashTable<K, V>
  {
     private Dictionary<K, V> vals = new Dictionary<K, V>();
     private Dictionary<V, K> keys = new Dictionary<V, K>();
     public void Add(K key, V val)
     {
        vals.Add(key, val);
        keys.Add(val, key);
     }
     public K this[v val] { get { return keys[val]; } }
     public V this[K key] { get { return vals[key]; } }
     // etc... 
  }

NOTE: This will be problematic is both K and V are the same type, you need a different formulation then...

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