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copied!<p>You'll have to instantiate one of the methods as a specific compatible delegate type. There's just no way around it. This will, unfortunately, be a little more verbose than you're looking for:</p> <pre><code>(a ? new Action<T1, T2, T3, T4>(f1) : f2)(a, long, parameter, list); </code></pre> <p>You're going to have to make the parameters involved explicit, whether that's by using an <code>Action</code> (or <code>Func</code>) generic overload that fits or declaring your own delegate type.</p> <p>This comes down to type resolution. Given the expression:</p> <pre><code>condition ? tVal : fVal </code></pre> <p>The compiler doesn't look for common assignment-compatible ancestors for <code>tVal</code> and <code>fVal</code> (and, even if it did, the litany of different delegate types to which each might be valid could be <em>huge</em>); if there isn't assignment compatibility between the types of <code>tVal</code> and <code>fVal</code> in either direction, the compiler makes you be explicit as to what you want.</p> <p>For what it's worth, you should be aware that taking this approach will allocate a new delegate to either <code>f1</code> or <code>f2</code> every time this method is called, then that delegate will be invoked, then discarded. I bring this up only because delegate invocation is slower than ordinary early-bound (or even virtual) method invocation. It may well not be a consideration and the tradeoff might be worth it, but it's still worth <em>knowing</em>.</p>

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