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PODictionary Keys that match over a Date Range
 

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    <p>I would like to store data in Generic Dictionary with keys that match over Date Ranges.</p> <p>For instance, I came up with the following idea</p> <pre><code>public class MyKey : IEquatable&lt;MyKey&gt; { public int Key { get; set; } public DateTime StartDate { get; set; } public DateTime EndDate { get; set; } public override int GetHashCode() { returns Key; } // if there is overlap in date range consider them equal public bool Equals(MyKey other) { if (Key!=other.Key) return false; else if(other.StartDate &gt;=StartDate &amp;&amp; other.StartDate &lt;=EndDate) return true; else if(other.EndDate &gt;=StartDate &amp;&amp; other.EndDate &lt;=EndDate) return true; else if(StartDate &gt;=other.StartDate &amp;&amp; StartDate &lt;=other.EndDate) return true; else if(EndDate &gt;=other.StartDate &amp;&amp; EndDate &lt;=other.EndDate) return true; else return false; } } </code></pre> <p>Then the I would use a Dictionary as so</p> <pre><code>var dict = new Dictionary&lt;MyKey,MyClass&gt;(); Populate(dict); // get an element where the current date is in the daterange of the key // in the collection var key = new MyKey(); key.Key=7; key.StartDate=DateTime.Now; key.EndDate=key.StartDate; // retrieve the matching element for the date var myclass = dict[key]; </code></pre> <p>This was the best I could come up with, however it seems kludgy way to do this. I thought of adding a fourth property called selection date. And would set that to null in the entries in the dictionary but would use it during lookups in the Equals method.</p> <p>I am wondering if anyone else has come up with an elegant solution to this problem?</p> <p>I should mention that I will be matching on the key first and then there could be date ranges for the specific key property.</p>
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    1. COVery similar to this question: http://stackoverflow.com/questions/2147505/a-dictionary-object-that-uses-ranges-of-values-for-keys
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      1. USMark Byers
    2. COYou don't want a Dictionary for this. You want an Interval Tree (http://en.wikipedia.org/wiki/Interval_tree) or an Interval Skip List data structure.
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      1. USKennet Belenky
 

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