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title BL0002: Component has multiple CaptureUnmatchedValues parameters
description Learn about analysis rule BL0002: Component has multiple CaptureUnmatchedValues parameters
author guardrex
monikerRange >= aspnetcore-3.1
ms.author riande
ms.date 10/21/2021
uid diagnostics/bl0002

BL0002: Component has multiple CaptureUnmatchedValues parameters

Value
Rule ID BL0002
Category Usage
Fix is breaking or non-breaking Non-breaking

Cause

More than one parameter on a type deriving from xref:Microsoft.AspNetCore.Components.ComponentBase is annotated with CaptureUnmatchedValues = true.

Rule description

For a component, exactly one parameter is expected to have the xref:Microsoft.AspNetCore.Components.ParameterAttribute.CaptureUnmatchedValues set to true.

@code
{
    [Parameter(CaptureUnmatchedValues = true)] public Dictionary<string, object> Parameter1 { get; set; }

    [Parameter(CaptureUnmatchedValues = true)] public Dictionary<string, object> Parameter2 { get; set; }
}

How to fix violations

Limit a single parameter to have CaptureUnmatchedValues set.

@code
{
    [Parameter(CaptureUnmatchedValues = true)] public Dictionary<string, object> Parameter1 { get; set; }

    [Parameter] public Dictionary<string, object> Parameter2 { get; set; }
}

When to suppress warnings

Do not suppress a warning from this rule.