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POHow to write Implicit Conversion from an Interface to another type?
 

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  1. POHow to write Implicit Conversion from an Interface to another type?
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    <p>I am trying to do something like below:</p> <pre><code>public class SomeWrapper : ISomeWrapper{ public static implicit operator ActualRec(ISomeWrapper someWrapper) { return ((SomeWrapper)someWrapper).SomeInfo; } } </code></pre> <p>But this code fails, saying: "Either parameter or return type must be of type SomeWrapper".</p> <p>I Understand the problem that compiling is stating. But I need this type conversionb because throughout my application I am using ISomeWrapper as the variable, storing SomeWrapper instance. (Also, SomeWrapper is the only class implementing ISomeWrapper).</p> <p>Is there any way to do the implicit conversion if ISomeWrapper interface to the type that i know in my concrete class?</p> <p>Edit: As suggested by all, implicit casting from interface is not possible in C#.</p> <p>The reason I need to do this? I want to allow (implicitly) to the user of ISomeWrapper to invoke methods that need ActualRec as the parameter WITHOUT giving access to the users of ISomeWrapper to call methods/properties of ActualRec.</p> <p>For instance, If I include a property ActualRec in ISomeWrapper then users of ISomeWrapper would be able to call methods available in ActualRec ( Say, someWrapper.ActualRec.Dispose() ), which I DO NOT want to expose.</p> <p>That's the reason for trying to find some implicit conversion.</p> <p>Also, I do not want to user SomeWrapper across application.</p> <p>Please suggest if there is some concept/pattern to get this done.</p> <p>Thanks for your interest.</p>
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    1. USManish Basantani
    1. USManish Basantani
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    1. CO"SomeWrapper is the only class implementing ISomeWrapper" -- that is waving a big red flag that says "bad code smell here". If there's only one class that implements the interface, then of what value is the interface? Just use the class everywhere.
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      1. POHow to write Implicit Conversion from an Interface to another type?
      1. USEric Lippert
    2. CO@Eric: It is not pointless because i use this interface for Unit Testing.
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      1. USManish Basantani
 

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