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POHow to refactor these 2 similar methods into one?
 

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    <p>I've seen some samples of using 'T' to make a method reuseable for generic collections of different classes, but I've never really gotten into it or understood the samples. </p> <p>I wonder if it would be possible to put the 2 methods below into one and what the downsides of doing this would be (performance-wise).</p> <p>Anyone? </p> <pre><code> [NonAction] public List&lt;SelectListItem&gt; ToSelectList(IEnumerable&lt;Department&gt; departments, string defaultOption) { var items = departments.Select(d =&gt; new SelectListItem() { Text = d.Code + " - " + d.Description, Value = d.Id.ToString() }).ToList(); items.Insert(0, new SelectListItem() { Text = defaultOption, Value = "-1" }); return items; } [NonAction] public List&lt;SelectListItem&gt; ToSelectList(IEnumerable&lt;Function&gt; functions, string defaultOption) { var items = functions.Select(f =&gt; new SelectListItem() { Text = f.Description, Value = f.Id.ToString() }).ToList(); items.Insert(0, new SelectListItem() { Text = defaultOption, Value = "-1" }); return items; } </code></pre> <hr> <p><strong>SOLUTION</strong></p> <p>The solution that I used:</p> <p><em>usage</em></p> <pre><code>var departmentItems = departments.ToSelectList(d =&gt; d.Code + " - " + d.Description, d =&gt; d.Id.ToString(), " - "); var functionItems = customerFunctions.ToSelectList(f =&gt; f.Description, f =&gt; f.Id.ToString(), " - "); </code></pre> <p><em>with</em></p> <pre><code> public static class MCVExtentions { public static List&lt;SelectListItem&gt; ToSelectList&lt;T&gt;(this IEnumerable&lt;T&gt; enumerable, Func&lt;T, string&gt; text, Func&lt;T, string&gt; value, string defaultOption) { var items = enumerable.Select(f =&gt; new SelectListItem() { Text = text(f), Value = value(f) }).ToList(); items.Insert(0, new SelectListItem() { Text = defaultOption, Value = "-1" }); return items; } } </code></pre>
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