AmbiguousMatchException: The request matched multiple endpoints.

AmbiguousMatchException: The request matched multiple endpoints.

By: Manoj in Asp.net Tutorials on 2023-06-01

The AmbiguousMatchException you encountered means that there are multiple endpoints in your code that match the incoming request. This can happen when you have multiple actions in a controller with the same name and same HTTP verb.

To resolve this issue, you need to make sure that each endpoint has a unique name or route. Here are a few possible solutions:

Rename the conflicting action methods: Give each action method in your controller a unique name that reflects its purpose. For example, instead of having two Index methods, you can rename them to Index1 and Index2.

Use attribute routing: Decorate your action methods with specific route attributes to differentiate them. By using [Route] attribute, you can specify unique routes for each action method. For example:

[Route("api/controller/action1")]
public IActionResult Action1()
{
    // Action1 implementation
}

[Route("api/controller/action2")]
public IActionResult Action2()
{
    // Action2 implementation
}

Use HTTP verbs to differentiate: If the actions have the same name but serve different HTTP verbs, you can use the [HttpGet], [HttpPost], [HttpPut], etc. attributes to specify the appropriate HTTP verb for each action. For example:
```
[HttpGet]
public IActionResult Index()
{
    // GET Index implementation
}

[HttpPost]
public IActionResult Index()
{
    // POST Index implementation
}
```

By making these changes, you ensure that each endpoint has a unique identifier, and the AmbiguousMatchException should be resolved.

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