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POC# Generics - Resolved - How to solve the ambiguous compiler error calling a method of passed generic type; e.g., IXList.Head() and IYList.Head()
 

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  1. POC# Generics - Resolved - How to solve the ambiguous compiler error calling a method of passed generic type; e.g., IXList.Head() and IYList.Head()
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    <p>The emphasis of my question is with <strong>C# Generics</strong> and the passing of the interface <strong>IXList</strong> -or- <strong>IYList</strong> to this '<strong>GetAllValues</strong>()' method. The goal is common code for calling <code>GetAllValues&lt;IXList&gt;()</code> -or- <code>GetAllValues&lt;IYList&gt;()</code>.</p> <p>09-21-13 Follow up: I have learned that: <code>where Z : IXList, IYList</code> means that Z is of type <code>IXList</code> and <code>ITList</code> -- given this understanding one might try <code>where Z : class</code> - this is at best a lateral step of still not working because then <code>Z.anything</code> ... <code>anything</code> is not found, the compiler is clueless about <code>Z</code>...</p> <p>Can the actual type of Z passed be tested and then conditional run-time code pick correct casted <code>list</code> to call .Head(), .Get(), and .Next() accordingly? e.g., <code>((IXList)list).Head();</code> -or- <code>((IYList)list).Head();</code> <strong>[[ Yes it is possible, please see 2nd answer with code below dated 09-24-13.]]</strong></p> <p>09-29-13 Follow up: And finally, answer/solution <strong>#3</strong> posted below moves the final solution to a more object oriented one. And thus, this 3rd solution <strong>renders moot</strong> my initial question on how to ask the type of generic and how to solve the compiler ambiguity error encountered initially. <strong>[[ Please see answer/solution #3, with code below dated 09-29-13.]]</strong></p> <pre><code> internal static IEnumerable&lt;int&gt; GetAllValues&lt;Z&gt;(Z list) where Z : IXList, IYList { try { list.Head(); // Error 344 - The call is ambiguous between the following // methods or properties: 'IXList.Head()' and 'IYList.Head()' } catch (Exception) { yield break; } do { IntPtr lineItemPointer; int x = list.Get(); // Error 345 - The call is ambiguous between the following // methods or properties: 'IXList.Get()' and 'IYList.Get()' yield return x; try { list.Next(); // Error 346 -The call is ambiguous between the following // methods or properties: 'IXList.Next()' and 'IYList.Next()' } catch (Exception) { yield break; } } while (true); } </code></pre>
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    1. USkevinwaite
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    1. COCasting to the interface you want in each particular case would work...
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      1. USAlexei Levenkov
    2. COThis sounds like a place `dynamic` might be useful, of course there are other implications to using dynamic.
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      1. USIddillian
 

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