Blazor, Feature Request: Make @renderMode an attribute, similar to how @page works.

[fArtuCh]

Is there an existing issue for this?

• I have searched the existing issues

Is your feature request related to a problem? Please describe the problem.

I’m creating Razor components from code by inheriting from ComponentBase. This approach allows me to set attributes like [Route("/Address")] easily. However, I cannot do the same for @renderMode.

I’ve converted many of my pages to be built via code using:

protected override void BuildRenderTree(RenderTreeBuilder __builder)

While this approach works well and gives me benefits such as better hot reload and better project structure, I’ve lost the ability to control render modes.

Using .cs files that inherit from ComponentBase is convenient, but I need a way to specify the RenderMode for these programmatically-built components.

Describe the solution you'd like

I would like to be able to add Attribute [RenderMode(RederModeOption)]. This attribute will influence building and linking options for blazor project and could replace @rendermode directive in the .razor file.

Additional context

No response

[javiercn]

@fArtuCh thanks for contacting us.

If you are referring to using @rendermode in the class definition, this is already possible. You can do this the same way the compiler does it.

Extend RenderModeAttribute and implement Mode to return whatever mode you want to use for that component. Then you apply your attribute on the class.

[fArtuCh]

Thank you for response. It was as simple as doing :

public class RenderModeServerNoPrerender : RenderModeAttribute
{
    public override IComponentRenderMode Mode => new InteractiveServerRenderMode(prerender: false);
}

[RenderModeServerNoPrerender]
public class InteractiveComponent : ComponentBase
{
    //...
 }

Documentation, web search like this : Blazor "RenderModeAttribute", AI agents gave nothing, sorry for trouble.

Maybe it would be a good idea to add section in documentation about this or prepare default attributes like RenderModeServerNoPrerender e.t.c .

Issue could be closed, thanks for help.