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POC# Generic Inheritance Issue with Base Library
 

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  1. POC# Generic Inheritance Issue with Base Library
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    <p>Given the following classes/interfaces defined in a base library:</p> <pre><code>public interface IWorkContext { T Node&lt;T&gt;() where T : class, IHierachy&lt;T&gt;; IHierachyItem Node(); } public interface IHierachyItem { int Id { get; set; } string Title { get; set; } } public interface IHierachy&lt;T&gt; : IHierachyItem where T : IHierachy&lt;T&gt; { T Parent { get; set; } IList&lt;T&gt; Children { get; set; } } public class WorkContext { public static IWorkContext Current { get { return DependencyResolver.Current.GetService&lt;IWorkContext&gt;(); } } } </code></pre> <p>Which has the following implentation inside another library (that references the base library above):</p> <pre><code>public class DefaultWorkContext : IWorkContext { // Nhibernate session private readonly ISession _session; public DefaultWorkContext(ISession session) { _session = session; } public T Node&lt;T&gt;() where T : class, IHierachy&lt;T&gt; { return _session.Get&lt;T&gt;(2); } public IHierachyItem Node() { return Node&lt;SiteMapNode&gt;(); } } </code></pre> <p>Where SiteMapNode exists in the same library (and is mapped to a database table):</p> <pre><code>public class SiteMapNode : IHierachy&lt;SiteMapNode&gt; { public virtual int Id { get; set; } public virtual SiteMapNode Parent { get; set; } public virtual string Title { get; set; } public virtual IList&lt;SiteMapNode&gt; Children { get; set; } public SiteMapNode() { Children = new List&lt;SiteMapNode&gt;(); } } </code></pre> <p>I can say the following to access a node and get the parent:</p> <pre><code>var node = WorkContext.Current.Node(); var parentNode = ((IHierachy&lt;SiteMapNode&gt;)node).Parent; var node2 = WorkContext.Current.Node&lt;SiteMapNode&gt;(); var parentNode2 = node2.Parent; </code></pre> <p>However i don't like either approach as option 1 requires a case and option 2 requires me to pass a default type.</p> <p>Is it possible to refactor this sample so that i can access the Parent and Child the same way I get the Id and Title.</p> <p>I hope i've explained the problem clear enough. I'd appreciate the help. Thanks</p>
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    1. COGenerally, the simplest example that exhibits the condition you want to ask about is better...
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      1. POC# Generic Inheritance Issue with Base Library
      1. USJames Michael Hare
 

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