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POProblem transforming dictionary with Linq
 

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  1. POProblem transforming dictionary with Linq
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    <p>I've got a dictionary laid out like so:</p> <pre><code>Dictionary&lt;string, List&lt;Series&gt;&gt; example = new Dictionary&lt;string, List&lt;Series&gt;&gt;(); example.Add("Meter1",new List&lt;Series&gt;(){ new Series{ name="Usage", data = new double[] {1,2,3}}, new Series{ name = "Demand", data= new double[]{4,5,6}}}); example.Add("Meter2", new List&lt;Series&gt;(){ new Series{ name="Usage", data = new double[] {1,2,3}}, new Series{ name = "Demand", data= new double[]{4,5,6}}}); </code></pre> <p>What I need is:</p> <pre><code> Dictionary&lt;string, List&lt;Series&gt;&gt; exampleResult = new Dictionary&lt;string, List&lt;Series&gt;&gt;(); exampleResult.Add("Usage", new List&lt;Series&gt;(){ new Series{ name="Meter1", data = new double[] {1,2,3}}, new Series{ name = "Meter2", data= new double[]{1,2,3}}}); exampleResult.Add("Demand", new List&lt;Series&gt;(){ new Series{ name="Meter1", data = new double[] {4,5,6}}, new Series{ name = "Meter2", data= new double[]{4,5,6}}}); </code></pre> <p>That is, the dictionary projected "sideways", with the name of each Series as the key in the new dictionary, with the key of the old dictionary used as the name of the series.</p> <p>Here's the series class...</p> <pre><code>public class Series { public string name { get; set; } public double[] data { get; set; } } </code></pre> <p>Sorry if I am not expressing this problem clearly, please ask any questions you'd like, and thanks in advance for any help...</p> <p><em>EDITED TO ADD EXAMPLE</em></p>
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    1. USChris McCall
    1. USChris McCall
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      1. VTUpMod
    1. COSounds like some kind of transposition . `Enumerable.ToLookup` might be what you need :)
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      1. USleppie
    2. COOn second thought, why not create a custom dictionary, that encapsulates the transposed view? Meaning, when inserting/updating/deleting, you can modify the alternative view. If it is only a 'one-time' procedure, a LINQ solution will probably be more elegant.
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      1. USleppie
    3. COThe dictionary types aren't at all clear to me. A short but complete example would be very useful.
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      1. POProblem transforming dictionary with Linq
      1. USJon Skeet
 

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