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copied!<p>I'm not sure why you want the as an interface as opposed to a regular class. Will other classes implement this interface, or are you just looking for a standard way to access the API?</p> <p>If you're just looking for a standard way to access the API, I'd suggest a variation on the builder pattern. The builder pattern is normally used for classes, but I don't see why it can't be used for methods as well. See <a href="http://cdmckay.org/blog/2009/07/03/joshua-blochs-builder-pattern-in-csharp/" rel="nofollow">http://cdmckay.org/blog/2009/07/03/joshua-blochs-builder-pattern-in-csharp/</a> for a couple class-based examples.</p> <p>Here's my attempt given what you supplied. I apologize if there are syntax errors, my editor at home is somewhat lacking...</p> <pre><code>public class AccessServiceAPI { private void MethodA(string mandatory, string mandatory2, string optional) { // do stuff } public class MethodABuilder { private string Mandatory { get; set; } private string Mandatory2 { get; set; } private string Optional { get; set; } public MethodABuilder( string mandatory, string mandatory2) { Mandatory = mandatory; Mandatory2 = mandatory; Optional = "default value"; } public MethodABuilder Optional( string optional ) { Optional = optional; return this; } public void Build() { MethodA(mandatory, mandatory2, optional); } } } </code></pre> <p>The client would then call the method like this:</p> <pre><code>MethodABuilder.Builder(mandatory, mandatory2).Optional(optional).Build(); </code></pre> <p>If they don't want to set a value for an optional parameter, they can just skip it.</p>

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