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    copied!<p>I started with your code (more or less) and resharper immediately told me that the cast to T was unnecessary:</p> <pre><code>public class Test { static TournamentGame&lt;T, Y&gt; make16Game&lt;T, Y&gt;(int gameId, int seed1, int seed2, List&lt;Y&gt; teams) where T : TournamentTeam&lt;Y&gt; where Y : Team { return new TournamentGame&lt;T, Y&gt;(gameId, new TournamentTeam&lt;Y&gt;(seed1, teams[seed1 - 1]), new TournamentTeam&lt;Y&gt;(seed2, teams[seed2 - 1])); } } internal class Team { } internal class TournamentTeam&lt;T&gt; { public TournamentTeam(int seed1, Team team) { throw new NotImplementedException(); } } internal class TournamentGame&lt;T, Y&gt; { public TournamentGame(int gameId, TournamentTeam&lt;Y&gt; tournamentTeam, TournamentTeam&lt;Y&gt; tournamentTeam1) { throw new NotImplementedException(); } } </code></pre> <p>So the need for the cast to T is coming from somewhere else. If you want a specific type of "constructor" for T, you can always pass along a factory method:</p> <pre><code> static TournamentGame&lt;T, Y&gt; make16Game&lt;T, Y&gt;(int gameId, int seed1, int seed2, Func&lt;int, Y, T&gt; tournamentTeamFactory, List&lt;Y&gt; teams) where T : TournamentTeam&lt;Y&gt; where Y : Team { return new TournamentGame&lt;T, Y&gt;(gameId, tournamentTeamFactory(seed1, teams[seed1 - 1]), tournamentTeamFactory(seed2, teams[seed2 - 1])); } </code></pre> <p>EDIT: Given the constructor code that you are using, it is clear why you need a cast to T (and why passing along a factory method, as I suggest above, is a good idea). If you want to limit TournamentGame to only taking TournamentTeams (which your code is <em>effectively</em> doing) then provide a constructor that takes TournamentTeam directly. If not, then you shouldn't be creating TournamentTeams in your make16Game function. Imagine the following:</p> <pre><code>public class AllStarTeam&lt;T&gt; : TournamentTeam&lt;T&gt; where T : Team { public AllStarTeam(int seed1, Team team) : base(seed1, team) { throw new NotImplementedException(); } } </code></pre> <p>Then this compiles, but throws a run time exception (a Bad Thing):</p> <pre><code>Test.make16Game&lt;AllStarTeam&lt;T&gt;, T&gt;(5, 5, 5, new List&lt;T&gt;()); </code></pre>
 

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