I have multiple .Net controllers that look like:

[HttpGet("{id}")]
public async Task<ActionResult<Int32>> GetById(Int32 id)
{
    id = FormatId(id);
    return lookupId(id);
}

Assume I have dozens of these endpoints in multiple controllers and some of them require the id to be formatted a certain way like an integer padded to 5 digits, so the FormatId pads it for me and if it’s more than 5 digits, it throws a BadHttpRequestException.

Now instead of littering all of the id related endpoints with:

try/catch { return BadRequest() }

Is there anyway I can attach a common exception handler to any/all endpoints/controllers?

Basically I just want to do something like:

Controller.OnException(Exception e)
{
    if (e.Type == BadHttpRequestException) // Ignore invalid C# syntax, just pseudocode
    {
        return BadRequest(e.Message);
    }
}

I assume that would be the supported way, or can I have access to the layer above the controller’s endpoint such that I could catch it myself and do something like:

public MyWrapperEndpoint(T endpoint)
{
    try {
        endpoint(); // call whatever endpoint was requested (GetById)
    } catch (BadHttpRequestException e) {
        return BadRequest(e.Message);  // Return the common exception message
    }
}