CancellationToken in templates

[Tyrrrz]

Hi!

It would be nice to have some sort of CancellationToken inside a template, that you can pass by calling Render() or RenderAsync().

The motivation is such that a template may invoke async methods that support cancellation, so it could be nice to propagate a token during rendering.

In MiniRazor, I just exposed a CancellationToken property:

https://github.com/Tyrrrz/MiniRazor/blob/c83bf8b9d4ed1d07dc4a377b30b308f6cecc44e2/MiniRazor.Runtime/TemplateBase.cs#L27-L28

Which is set when calling RenderAsync():

https://github.com/Tyrrrz/MiniRazor/blob/c83bf8b9d4ed1d07dc4a377b30b308f6cecc44e2/MiniRazor.CodeGen/TemplateClassGenerator.cs#L95-L103

[ltrzesniewski]

Hi!

That's a good idea. Adding a CancellationToken property and a RenderAsync overload/default argument makes sense. I suppose I should also add this to Render for parity's sake.

In the meantime, you can work around the lack of this feature by adding the property to the template, or by creating an intermediate base class. It's a bit cumbersome though.

@functions
{
	public CancellationToken CancellationToken { get; init; }
}

[Tyrrrz]

That's a good workaround, thanks!

[ltrzesniewski]

This is released in https://github.com/ltrzesniewski/RazorBlade/releases/tag/v0.3.0