#nullable enable annotations: Sets the nullable annotation context to enabled.

#nullable disable annotations: Sets the nullable annotation context to disabled.

#nullable restore: Restores the nullable annotation and warning contexts to project settings.

#nullable enable: Sets the nullable annotation and warning contexts to enabled.

#nullable disable: Sets the nullable annotation and warning contexts to disabled.

The effect of the directives is as follows: A directive sets the context(s) it controls until another directive overrides it, or until the end of the source file. The #nullable directive controls the annotation and warning contexts and takes precedence over the project-level settings. Each context is either disabled or enabled.īoth contexts can be specified at the project level (outside of C# source code). This directive controls whether nullable annotations have effect, and whether nullability warnings are given. The #nullable preprocessor directive sets the nullable annotation context and nullable warning context.

A preprocessor directive must be the only instruction on a line. Unlike C and C++ directives, you can't use these directives to create macros. You use them to help in conditional compilation. Although the compiler doesn't have a separate preprocessor, the directives described in this section are processed as if there were one.

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