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PO.NET container for two-way conversion data?
 

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  1. PO.NET container for two-way conversion data?
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    <p>I have conversion tables I need to contain in memory for fast access. Until now I used a simple <code>Hashtable</code> were the Key was the internal code, and the Value was an object holding the external code and other meta-data.</p> <p>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:</p> <ol> <li>Have another container for this look-up, Hashtable containing only the internal code as Value to prevent more redundancy.</li> <li>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).</li> <li>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 ).</li> </ol> <p>The container is being lazy-loaded, so options 1&amp;2 usually won't perform under the worst-case scenario.</p> <p>Thoughts anyone? Please tell me there's some efficient container I could use for that, which I missed!</p> <p><strong>* EDIT *</strong></p> <p>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?</p> <pre><code>Dictionary&lt;K1,V&gt; forward; Dictionary&lt;K2,V&gt; reverse; //... void Add(V myObject) { // myObject being the BLL object forward.Add(myObject.InternalCode, myObject); reverse.Add(myObject.ExternalCode, myObject); } </code></pre> <p>Itamar.</p>
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    1. COWhy can't you lazy-load the reverse-lookup hash?
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    2. COI am, even on an item basis (and not the whole list at once). This is my starting point - am trying to find the best option in terms of both performance and memory usage.
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