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    <p>The type of the conditional expression has to be inferred as a whole - and lambda expressions always have to be converted to a specific delegate or expression tree type.</p> <p>In your latter two examples, the compiler knows what it's trying to convert the lambda expression to. In the first example, it tries to work out the type of the whole conditional expression first.</p> <p>A cast in one of the branches would be enough though:</p> <pre><code>protected override Func&lt;Stream&gt; GetStream() { return someBool ? (Func&lt;Stream&gt;) (() =&gt; EmbeddedResourceExtractor.GetFile("SomeFile1.ext")) : () =&gt; EmbeddedResourceExtractor.GetFile("SomeFile2.ext"); } </code></pre> <p>Sergio's fix (now deleted, but included below) will work <em>if</em> you were happy to evaluate <code>someBool</code> at the time the function is called:</p> <pre><code>protected override Func&lt;Stream&gt; GetStream() { return () =&gt; someBool ? EmbeddedResourceExtractor.GetFile("SomeFile1.ext") : EmbeddedResourceExtractor.GetFile("SomeFile2.ext"); } </code></pre> <p>Depending on timing, there are all kinds of different ways of fixing the example you've actually given, e.g.</p> <pre><code>protected override Func&lt;Stream&gt; GetStream() { string name = someBool ? "SomeFile1.ext" : "SomeFile2.ext"; return () =&gt; EmbeddedResourceExtractor.GetFile(name); } </code></pre> <p>I'm guessing your real code is more complicated though.</p> <p>It's a shame in some ways that C#'s type inference can't be more powerful - but it's already pretty complicated.</p>
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    1. POC#: No implicit conversion between 'lambda expression' and 'lambda expression'?
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    1. USJon Skeet
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    1. COWith the exception of having to wrap the first branch in parenthesis, that worked yes... Hope they can make the C#'s type inference even better in the future. Although, it is pretty nice already =)
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    2. CONice options, actually hadn't thought of any of them. But those will make it clearer yes :)
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    3. COdo you suppose this is something they would ever improve upon? This issue (and others similar to it -- like not being able to use **var** with lambdas) does indeed seem a shame.
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      1. USKirk Woll
 

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