51 lines
1.4 KiB
Markdown
51 lines
1.4 KiB
Markdown
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---
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title: "BL0002: Component has multiple CaptureUnmatchedValues parameters"
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description: "Learn about analysis rule BL0002: Component has multiple CaptureUnmatchedValues parameters"
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author: pranavkm
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monikerRange: '>= aspnetcore-3.1'
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ms.author: riande
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ms.date: 10/21/2021
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uid: diagnostics/bl0002
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---
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# BL0002: Component has multiple CaptureUnmatchedValues parameters
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| | Value |
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| **Rule ID** |BL0002|
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| **Category** |Usage|
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| **Fix is breaking or non-breaking** |Non-breaking|
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## Cause
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More than one parameter on a type deriving from <xref:Microsoft.AspNetCore.Components.ComponentBase> is annotated with `CaptureUnmatchedValues = true`.
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## Rule description
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For a component, exactly one parameter is expected to have the <xref:Microsoft.AspNetCore.Components.ParameterAttribute.CaptureUnmatchedValues> set to `true`.
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```razor
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@code
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{
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[Parameter(CaptureUnmatchedValues = true)] public Dictionary<string, object> Parameter1 { get; set; }
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[Parameter(CaptureUnmatchedValues = true)] public Dictionary<string, object> Parameter2 { get; set; }
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}
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```
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## How to fix violations
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Limit a single parameter to have `CaptureUnmatchedValues` set.
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```razor
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@code
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{
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[Parameter(CaptureUnmatchedValues = true)] public Dictionary<string, object> Parameter1 { get; set; }
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[Parameter] public Dictionary<string, object> Parameter2 { get; set; }
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}
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```
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## When to suppress warnings
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Do not suppress a warning from this rule.
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