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copied!<p>Its not possible to create such an restriction. You should check the input at runtime and throw a helpful exception error message.</p> <p>You can however do something like:</p> <pre><code>public interface IWellKnown { int PropertyA { get; } int PropertyB { get; } } public abstract class WellKnownBase<T> : IWellKnown { IWellKnown.PropertyA { get { return Convert(this.PropertyA); } } IWellKnown.PropertyB { get { return Convert(this.PropertyB); } } public T PropertyA { get; } public T PropertyA { get; } protected virtual int Convert(T input) { return (int)input; } } </code></pre> <p>Using such a base class guides the one implementing a concrete version to provide a way to cast to <code>int</code>. The explicit interface implementation provides access to <code>int</code> typed accessors while the "real" class still provides the original type.</p> <pre><code>public class WellKnownFloat : WellKnownBase<Float> {} </code></pre> <p>Would provide you with a class for float. If the type is not castable to int you can provide a custom converter:</p> <pre><code>public class WellKnownTimeSpan : WellKnownBase<TimeSpan> { protected override int Convert(TimeSpan input) { return (int)input.TotalMilliseconds; } } </code></pre> <p>By the way, using linq and adding the requirement to the interface you can rewrite your function to <code>input.Select(x => x.PropertyA + x.PropertyB)).ToArray()</code>.</p> <p>PS: please check the code using VisualStudio, I am just writing it out of my head without compiler support ;) There may be small compiletime errors.</p>

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