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    <p>Here is a sample that works and how you can force which will be called:</p> <pre><code> private static readonly Program p = new Program(); private Foo foo; static void Main(string[] args) { p.foo = new Foo(); p.foo.IsFoo = true; p.foo.IsIFoo = true; // uses Transact(Func&lt;Foo, bool&gt; funcBlock) var isFoo = p.Transact(f =&gt; f.IsFoo == true); Console.WriteLine("isFoo: {0}", isFoo); // this is ambiguous //var isIFoo = p.Transact(f=&gt; (f as IFoo).IsIFoo == true); // this works var isIFoo = p.Transact((IFoo f) =&gt; f.IsIFoo == true); Console.WriteLine("isIFoo: {0}", isIFoo); Console.ReadLine(); } bool Transact(Func&lt;Foo, bool&gt; funcBlock) { Console.WriteLine("Transact(Func&lt;Foo, bool&gt; funcBlock)"); return (funcBlock(p.foo)); } bool Transact(Func&lt;IFoo, bool&gt; funcBlock) { Console.WriteLine("Transact(Func&lt;IFoo, bool&gt; funcBlock)"); return (funcBlock(p.foo)); } } class Foo : IFoo { public bool IsFoo { get; set; } public bool IsIFoo { get; set; } } interface IFoo { bool IsIFoo { get; set; } } </code></pre> <p>As someone else stated, the compiler will determine which function is being called. But in my example, Foo is also an IFoo so I assume this is the crux of the issue.</p> <p>Output: </p> <blockquote> <p>Transact(<code>Func&lt;Foo, bool&gt; funcBlock</code>)<br> isFoo: True </p> <p>Transact(<code>Func&lt;IFoo, bool&gt; funcBlock</code>)<br> isIFoo: True</p> </blockquote> <p><strong>Update</strong> <em>per comment</em><br> To summarize and put this in scope of the question, use one of the following to determine which function your code should call:</p> <pre><code>((DbTransaction transaction) =&gt; ...) </code></pre> <p>... or</p> <pre><code>((IDbTransaction transaction) =&gt; ...) </code></pre>
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    1. COIf I'm understanding this right, you can sum up this answer as "Use `((DbTransaction transaction) => ...)` or `((IDbTransaction transaction) => ...)`.
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    2. COThat would be the summary, yes :)
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    3. COIs there a specific term for this action? It's basically explicit type declaration in a situation where you wouldn't even use `var`.
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