BL0001: Component parameter should have public setters

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.