AspNetCore.Docs/aspnetcore/diagnostics/bl0001.md

title	description	author	monikerRange	ms.author	ms.date	uid
BL0001: Component parameter should have public setters	Learn about analysis rule BL0001: Component parameter should have public setters	pranavkm	>= aspnetcore-3.1	riande	10/21/2021	diagnostics/bl0001

BL0001: Component parameter should have public setters

	Value
Rule ID	BL0001
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] has a missing or non-public setters.

Rule description

Component parameters are required to have publicly accessible setters to allow the framework to assign values. All of the parameter declarations in the following example result in this diagnostic.

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

    [Parameter] public int Parameter2 { get; }

    [Parameter] public int Parameter3 { get; private set; }
}

How to fix violations

• Make the property and its setter public.

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

    [Parameter] public int Parameter2 { get; set; }

    [Parameter] public int Parameter3 { 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.