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POOverride a Property with a Derived Type and Same Name C#
 

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    <p>I'm trying to override a property in a base class with a different, but derived type with the same name. I think its possible by covarience or generics but am not sure how to do it?</p> <p>The following code gets the error:</p> <blockquote> <p>Error 1 'Sun.Cache': type must be 'OuterSpace.Cache' to match overridden member 'OuterSpace.Cache'</p> </blockquote> <pre><code>public class OuterSpace { public virtual OuterSpaceData Data {get; set;} public virtual OuterSpaceAnalysis Analysis {get; set;} public virtual OuterSpaceCache Cache {get; set;} public class OuterSpaceData { //Lots of basic Data Extraction routines eg public virtual GetData(); } public class OuterSpaceAnalysis { //Lots of Generic Analysis on Data routines eg public virtual GetMean(); } public class OuterSpaceCache { //Lots of Caches of Past Analysis Results: public Dictionary&lt;AnalysisType, List&lt;Result&gt;&gt; ResultCache; } } public class Sun : OuterSpace { public override SunData Data {get; set;} public override SunAnalysis Analysis {get; set;} public override SunCache Cache {get; set;} public SunData : OuterSpaceData { //Routines to specific get data from the sun eg public override GetData(); } public SunAnalysis : OuterSpaceAnalysis { //Routines specific to analyse the sun: eg public double ReadTemperature(); } public SunCache : OuterSpaceCache { //Any data cache's specific to Sun's Analysis public Dictionary&lt;AnalysisType, List&lt;Result&gt;&gt; TempCache; } } public class Moon : OuterSpace {} etc. </code></pre> <p>For the end result, when I address the "Data" Object of Sun I don't want there to be two Data Objects (Inherited &amp; Base Class) but when I try override the property it requires the Sun variables to be the same type as base class. Eg:</p> <pre><code>Sun EarthSun = new Sun() EarthSun.Analyse() //The OuterSpace Analysis Saves results to Sun Cache: //Now try use the result: EarthSun.Cache[0]... </code></pre> <p>Very similar to this but with derived type instead of string-array: <a href="https://stackoverflow.com/questions/1112458/c-member-variable-overrides-used-by-base-class-method">C# Member variable overrides used by base class method</a></p> <p>And this answer didn't make much sense to me: <a href="https://stackoverflow.com/questions/1123975/how-to-override-member-of-base-class-after-inheritance-in-c">How to override member of base class after inheritance in C++</a></p> <p>Or perhaps this means its just not possible? <a href="https://stackoverflow.com/questions/157119/c-can-i-override-with-derived-types">Can I Override with derived types?</a></p> <p>Help! :) Any work around?</p>
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    1. COSlightly off-topic, but does it make sense to say that Sun is a kind of OuterSpace? Some of the awkwardness here may be from using inheritance where a simpler structure would suffice.
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    2. COI welcome suggestions? This is a demo pseudo code of the problem, the actual project is very large and I'm just trying to plan for the future.
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    3. COit's difficult to say from just the sample structure you provided. The main thing to consider is how you're actually _using_ the classes. In particular, what is it about the Cache, Analysis and Data classes that makes it beneficial to access them as base classes? You have a class that coordinates the analysis, but it also seems that the coordination is different for each type of analysis; that suggests to me that are hidden responsibilities that may need further investigation. If you don't have a use-case yet for the generic structure, I would avoid it; YAGNI.
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