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POWhy can static classes not implement interfaces?
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copied!<blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/259026/why-doesnt-c-allow-static-methods-to-implement-an-interface">Why Doesn’t C# Allow Static Methods to Implement an Interface?</a> </p> </blockquote> <p>In my application I want to use a Repository that will do the raw data access (TestRepository, SqlRepository, FlatFileRepository etc). Because such a repository would be used throughout the runtime of my application it seemed like a sensible thing to me to make it a static class so I could go</p> <pre><code>SqlRepository.GetTheThingById(5); </code></pre> <p>without it having to be regenerated all the time. Because I want my repositories to be interchangeable, I wnat them to implement a common interface: IRepository. But when I try to do so, I get </p> <pre><code>"Static classes cannot implement interfaces" </code></pre> <p>Why can't they? How do you suggest I change my design then? Is there a pattern I could use?</p> <p><strong>UPDATE</strong><br> Five years later: this question is visited 20k+ times, I learned about the disadvantages of the repository pattern, learned about IoC and realise my question was poorly formulated. </p> <p>I wasn't really asking what the C# specification of an interface is, rather why it was deliberately restricting me in this specific way. </p> <p>The practical answer is that the syntax for calling a method on an instance or on a type are different. But the question is closed.</p>

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