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Alexandru Bucur
Alexandru Bucur

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How to get the user id after registering an user in ASP .NET Core Identity

Getting back to work on my side project I got into finishing the user registration trough the API. Following the JSON API spec, it requires returning a 201 created and the resource id when creating a database entry.

For somebody used with ASP this might seem trivial but it's not that obvious when creating a new user.

Let's take a simple example:

var user = new ApplicationUser { UserName = model.Email, Email = model.Email };
var result = await _userManager.CreateAsync(user, model.Password);
if (result.Succeeded)
    // do stuff here
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Usually you would think that result would somehow contain the user's id but that's not the case.
However, if your operation succeeded, the user variable will contain the newly created database properties.

So you can do something like:

return StatusCode(StatusCodes.Status201Created, new {
    data = new { id = user.Id }
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Top comments (2)

pbouillon profile image
Pierre Bouillon

Hey, I was exactly looking for this, thanks for sharing ! 😄

salimalitarikz profile image

I am quite new to this thing. I am sure of this is what I need. Maybe this is a very basic question but how can I get and use data.