39 lines
891 B
Markdown
39 lines
891 B
Markdown
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---
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title: "ASP0018: Unused route parameter"
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description: "Learn about analysis rule ASP0018: Unused route parameter"
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author: tdykstra
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monikerRange: '>= aspnetcore-8.0'
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ms.author: tdykstra
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ms.date: 11/22/2022
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uid: diagnostics/asp0018
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---
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# ASP0018: Unused route parameter
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| | Value |
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| **Rule ID** |ASP0018|
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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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A route parameter is specified but not used.
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## Rule description
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A route parameter is specified but not used. In the example below, the `name` parameter is defined in the route but not in the route handler.
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```csharp
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var app = WebApplication.Create();
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app.MapGet("/{id}", () => ...);
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```
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## How to fix violations
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To fix a violation of this rule, remove the route parameter or add code that uses the parameter.
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## When to suppress warnings
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Do not suppress a warning from this rule.
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