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copied!<p>The <code>protected</code> modifier can be quite problematic in F#, because you often need to call members from a lambda expression. However, when you do that, you no longer access the method from within the class. This also causes confusion when using protected members declared in C# (see for example <a href="https://stackoverflow.com/questions/2366490/f-how-to-access-protected-member">this SO question</a>). If you could declare a <code>protected</code> member, the following code could be surprising: </p> <pre><code>type Base() = protected member x.Test(a) = a > 10 type Inherited() = inherit Base() member x.Filter(list) = list |> List.filter (fun a -> x.Test(a)) </code></pre> <p>This code wouldn't work, because you're calling <code>Test</code> from a lambda function (which is a different object than the current instance of <code>Test</code>), so the code wouldn't work. I think this is tha main reason for not supporting the <code>protected</code> modifier in F#.</p> <p>In F# you typically use implementation inheritance (that is, inheriting from a base class) much less frequently than in C#, so you shouldn't need <code>protected</code> as often. Instead, it is usually preferred to use interfaces (in the object-oriented F# code) and higher-order functions (in the functional code). However, it is difficult to say how to avoid the need for <code>protected</code> in general (other than by avoiding implementation inheritance). Do you have some specific example which motivated your question?</p>

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