How do I do #nullable enable in an aspnetcore razor view page (.cshtml)

Question

Possible Duplicate, but I've been unable to find anything on this.

I have an asp.net core MVC project, which makes use of normal views using Razor.

I have some ViewModel objects with nullable reference types, and I'm using the C# 8 null-safety feature to mark those appropriately (e.g. string? Name)

My problem is, when I use those variables in a cshtml file, as strongly typed Models, the null-safety isn't applied because I haven't enabled it for the file.

If it were a .cs file, I'd stick #nullable enable at the top, but what can I do for razor pages?

Update to clarify: If possible, I would like null-safety warnings on all @code blocks throughout the razor file. Tân's answer shows how to enable it for a specific block, but I'd like it for something like this

@Model.Name.ToUpper()

Specifically, I'd like a warning on Name.ToUpper() as Name is nullable and I didn't use the ? operator when calling ToUpper

user_10550549 · Answer

There isn't enough information in your question to say what you need to do (such as: adding some package(s), removing some package(s)...)

But by default, Razor syntax supports for #nullable, you can use it inside @{} block.

Example:

@{
    #nullable enable
    string name1 = User.Identity.Name.ToLower();
    #nullable disable

    // compiler won't complain anything here...
    string name2 = User.Identity.Name.ToLower();
}

Test:

My csproj file what I've used to test:



  
    netcoreapp3.1

How do I do #nullable enable in an aspnetcore razor view page (.cshtml)

1 Answers