bl0004.md

title	description	author	monikerRange	ms.author	ms.date	uid
BL0004: Component parameter should be public	Learn about analysis rule BL0004: Component parameter should be public	pranavkm	>= aspnetcore-3.1	riande	10/21/2021	diagnostics/bl0004

BL0004: Component parameter should be public

	Value
Rule ID	BL0004
Category	Usage
Fix is breaking or non-breaking	Breaking

Cause

A property on a type deriving from xref:Microsoft.AspNetCore.Components.ComponentBase annotated with [Parameter] is not public.

Rule description

Component parameters are required to be public and must have a public setter.

@code
{
    [Parameter] int Parameter1 { get; set; }
}

How to fix violations

• Make the property and its setter public.

@code
{
    [Parameter] public int Parameter1 { get; set; }
}

• If making the property non-public is not possible, consider implementing SetParametersAsync manually.

When to suppress warnings

Do not suppress a warning from this rule.