CODEWITHSUNDEEP
c#c#-8.0non-nullable
BennoDual
BennoDual

Reputation: 6289

What does Nullable Annotation exactly mean?

In Visual Studio 2019 I can set the Nullable Option in the Build-Properties to Annotation. When I read in the docs for this settings:

Variables of a reference type, string for example, are non-nullable. All nullability warnings are disabled.

Now I wonder what the exact use of this setting is. The variables are non-nullable, but there are no warnings. The Non-Nullable-Feature of C# 8 only generates warnings. Why is there a setting which says the variables are non-nullable but there are no warnings?

Upvotes: 2

Views: 2408

Answers (1)

Julien Couvreur
Julien Couvreur

Reputation: 5003

The #nullable enable annotations directive and the corresponding project setting are useful to add annotations to a public API before being ready to deal with warnings in your code.

In such a nullable context, string means "not-nullable string", but no warnings are produced if you assigned null to a variable of that type or if you dereference a variable of type string?.

Upvotes: 2

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