How to Fix: A route named "x" is already in the route collection. Route names must be unique. Exception with ASP.NET MVC 3
Duplicate route names must be unique in ASP.NET MVC 3.
📋 Table of Contents
The exception 'A route named '' is already in the route collection. Route names must be unique.' occurs when you try to add a duplicate route name to your ASP.NET MVC application.
🛑 Root Causes of the Error
- Using the same route name in multiple controllers or actions.
🔧 Proven Troubleshooting Steps
Method 1: Check for Duplicate Route Names
- Step 1: Open the RouteConfig.cs file and review all route definitions.
Method 2: Use Unique Route Names
- Step 1: Update all route names to be unique and descriptive.
🎯 Final Words
To resolve this issue, simply review your route definitions and update any duplicate or non-descriptive names. This will ensure that all routes are unique and functioning correctly.
❓ Frequently Asked Questions
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