ASP0018: Unused route parameter

Cause

A route parameter is specified but not used.

Rule description

A route parameter is specified but not used. In the example below, the id parameter is defined in the route but not in the route handler.

var app = WebApplication.Create();

app.MapGet("/{id}", () => ...);

How to fix violations

To fix a violation of this rule, remove the route parameter or add code that uses the parameter.

var app = WebApplication.Create();

app.MapGet("/{id}", (string id) => ...);

When to suppress warnings

In general, do not suppress a warning from this rule without validating the route parameter is used. Currently properties within the bound model for FromRoute attributes may not be analyzed. For more information, see GitHub issue #54212.