Using [NotNull] for a method's parameters

Question

Consider this code from ASP.NET MVC\'s source code:

public static IApplicationBuilder UseMvc(
            [NotNull] this IApplicationBuilder app,
            [No         


        

Answer 1

If you wish to move Null checks to be implemented by aspects and not need to be done by hand. The clear solution is to use Fody the open source build weaver. Specifically you want to leverage the NullGuard Fody

PM> Install-Package NullGuard.Fody

Should be everything required to get set up to use Fody with null guards. The documentation shows how you can have fine grain control if you desire.

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2019 Update

C# 8 and .NET Core 3.0 permanently eliminate null reference exceptions.

Tutorial: Migrate existing code with nullable reference types

Tutorial: Express your design intent more clearly with nullable and non-nullable reference types