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POTransforming a generic list of one type to another type, where the types are only known at runtime
 

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  1. POTransforming a generic list of one type to another type, where the types are only known at runtime
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    <p>Essentially, I'm looking for a way to transform <code>GenericList&lt;TInput&gt;</code> to <code>GenericList&lt;TOutput&gt;</code>, where <code>GenericList</code> is a generic list of any type that implements a specific interface, and the types <code>TInput</code> and <code>TOutput</code> are only known at runtime.</p> <p>Below is a snippet of a class and method that can perform this operation, where <code>TInput</code> and <code>TOutput</code> are supplied at compile time.</p> <pre><code> // -------------------------------------------------------------------------------- /// &lt;summary&gt;This class is an example snippet for transforming generic lists of different types.&lt;/summary&gt; /// /// &lt;remarks&gt;&lt;/remarks&gt; // -------------------------------------------------------------------------------- public abstract class GenericListHelper&lt;TInput, TOutput&gt; where TInput : IGenericObject, new() where TOutput : IGenericObject, new() { // -------------------------------------------------------------------------------- /// &lt;summary&gt;This method takes in a generic list of an input type /// and transforms it a list of the output type.&lt;/summary&gt; /// /// &lt;param name="inputGenericList"&gt;The input list to transform to this list.&lt;/param&gt; /// &lt;param name="filterElements"&gt;Field and property values to exclude from transform.&lt;/param&gt; // -------------------------------------------------------------------------------- public static GenericList&lt;TOutput&gt; CreateList(GenericList&lt;TInput&gt; inputGenericList, NameObjectCollection filterElements) { if (inputGenericList != null) { GenericList&lt;TOutput&gt; outputGenericList = new GenericList&lt;TOutput&gt;(); foreach (TInput loopItem in inputGenericList) { TOutput newItem = new TOutput(); DataTransformHelper.TransformDataFromObject(loopItem, newItem, filterElements); outputGenericList.Add(newItem); } return outputGenericList; } return null; } } </code></pre> <p>Is there any way of doing something along these lines where <code>TInput</code> and <code>TOutput</code> can be supplied at runtime?</p> <p>Using reflection in one form or another seems to be the path to get there.</p> <p>Initially, I tried creating a constructor for <code>GenericList&lt;TInput&gt;</code> that would take a list of type <code>TOutput</code> as a parameter (then I could call <code>Activator.CreateInstance</code> to get the new list).</p> <p>Alternatively, I tried invoking the above method through reflection, but since that method is flagged <code>ContainsGenericParameters=true</code>, and is flagged as <code>IsGenericMethod=false</code>, I was not able to invoke the method, either through a normal <code>method.Invoke</code> or through a generic <code>method.Invoke</code> (unable to call <code>MakeGenericMethod</code>).</p>
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    1. USDave Clemmer
    1. USDave Clemmer
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      1. VTUpMod
    1. COIs this C# ? How about adding the C# tag ?
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      1. USsellibitze
    2. COwhat on earth are you up to? What's wrong with IList<T>?
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      1. USmcintyre321
    3. COI tagged as C#. Not sure by what you mean by "what's wrong with IList<T>. In my case, the "GenericList" and the "IGenericObject" items they contain need to do a bunch of other things to support my particular enterprise requirements. Say for example I have Customers and customers have Orders. In the overall system, Domain A has Customers and Orders and Domain B has Customers and Orders, mostly similar, but not identical to Domain A. Want to be able to transform customers and their orders between these domains, and within each domain, the customers and orders are strongly typed.
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      1. POTransforming a generic list of one type to another type, where the types are only known at runtime
      1. USDave Clemmer
 

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