33 lines
1.3 KiB
Markdown
33 lines
1.3 KiB
Markdown
|
---
|
||
|
|
title: "BL0005: Component parameter should not be set outside of its component"
|
||
|
|
description: "Learn about analysis rule BL0005: Component parameter should not be set outside of its component"
|
||
|
|
author: pranavkm
|
||
|
|
monikerRange: '>= aspnetcore-3.1'
|
||
|
|
ms.author: riande
|
||
|
|
ms.date: 10/21/2021
|
||
|
|
uid: diagnostics/bl0005
|
||
|
|
---
|
||
|
|
# BL0005: Component parameter should not be set outside of its component
|
||
|
|
|
||
|
|
| | Value |
|
||
|
|
|-|-|
|
||
|
|
| **Rule ID** |BL0005|
|
||
|
|
| **Category** |Usage|
|
||
|
|
| **Fix is breaking or non-breaking** |Non-breaking|
|
||
|
|
|
||
|
|
## Cause
|
||
|
|
|
||
|
|
A property on a type deriving from <xref:Microsoft.AspNetCore.Components.ComponentBase> annotated with [`[Parameter]`](xref:Microsoft.AspNetCore.Components.ParameterAttribute) is being assigned to from outside the component.
|
||
|
|
|
||
|
|
## Rule description
|
||
|
|
|
||
|
|
Component parameters should be assigned to as part of the component initialization or as part of `SetParametersAsync`. Assigning a value to a parameter from an external source results in the value being overwritten the next time the component renders.
|
||
|
|
|
||
|
|
## How to fix violations
|
||
|
|
|
||
|
|
Consider using a distinct property to receive values from other components. Additional code can then be written to decide which of the two values to use in the component.
|
||
|
|
|
||
|
|
## When to suppress warnings
|
||
|
|
|
||
|
|
Do not suppress a warning from this rule.
|