I have the following controller method:
[HttpGet]
[Route("api/users/{lookup}/{id?}")]
public async Task<IHttpActionResult> GetUsers(string lookup, [FromUri]string[] id = null) { //Can a parameter than comes FromUri ever be null?
var repo = _uProvider.GetRepository(lookup);
if (repo == null) {
return Content(HttpStatusCode.NotFound, String.Concat(lookup, " is not a valid lookup type."));
}
if (id == null || id.Length == 0) { //added id.Length check because id was never null
var all = await repo.GetAll();
return Ok(all);
}
var users = await repo.GetUsersByIds(id);
if (users == null) {
return NotFound();
}
return Ok(users);
}
Why is it that when I submit a Get request to api/users/domain, the string[] id
is never null? I had to add the id.Length == 0
check to catch the use case where a client would like a full list of users within the domain.
I do not believe that it can be null. I think that it would default to an empty array, as in the JSON string sent would be as "[]".
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