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A Roslyn analyzer which requires that classes be sealed, abstract, or attributed with [Open].
Design and document for inheritance or else prohibit it
– Item 19, Effective Java, Third Edition
C# creates new types as open by default which can be dangerous. This analyzer ensures that the intent to leave a class open is explicitly declared.
using Nopen.NET.Attributes;
sealed class Foo {}
abstract class Bar {}
[Open] class Baz {}Non-sealed, non-abstract classes without the [Open] attribute will be marked with an error.
class Bad {}Bad.cs(1,1): error Nopen: Class 'Bad' is implicitly open. Classes should be explicitly marked sealed, abstract, or [Open].
For more information see Item 19 of Effective Java, Third Edition.
<ItemGroup>
<PackageReference Include="Nopen.NET" Version="<version_here>" PrivateAssets="All" />
</ItemGroup>Thanks to Jake Wharton and his Nope'n project for the idea.
Copyright 2019 Marius Volkhart Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.