how to delete users including roles and users from AspnetRoleUsers - asp.net-core

Question

I am making a project using asp.net core 3.1 and I can't find the right source of deleting users including roles in Asp.net core 3.1 using Web.api
This is the code I have tried but seems like not appropriate but haven't tried yet. Do you have any ideas of how to realize that?
I want to appropriately check the error using Web Api functions such as statuscode or any error messages to the frontend.
[HttpPost, ActionName("Delete")]
public async Task<ActionResult> DeleteUser(string id)
{
var user = await _userManager.FindByIdAsync(id);
var rolesForUser = await _userManager.GetRolesAsync(user);
if (rolesForUser.Count() > 0)
{
foreach (var item in rolesForUser.ToList())
{
// item should be the name of the role
var result = await _userManager.RemoveFromRoleAsync(user, item);
}
}
await _userManager.DeleteAsync(user);
return OkResult(result);
}

Answer 1

You don't need to loop the roles and delete , you can use RemoveFromRolesAsync :
public virtual Task<IdentityResult> RemoveFromRolesAsync(TUser user, IEnumerable<string> roles);
And each operation will return IdentityResult which could be used to check the operation status :
if (User.Identity.IsAuthenticated)
{
try
{
var user = await _userManager.FindByIdAsync(id);
var roles= await _userManager.GetRolesAsync(user);
var result = await _userManager.RemoveFromRolesAsync(user, roles);
if (result.Succeeded)
{
var resultdelete = await _userManager.DeleteAsync(user);
if (result.Succeeded)
{
return Ok();
}
else
{
List<string> errors = new List<string>();
foreach (var error in result.Errors)
{
errors.Add(error.Description);
}
return BadRequest(errors);
}
}
else
{
List<string> errors = new List<string>();
foreach (var error in result.Errors)
{
errors.Add(error.Description);
}
return BadRequest(errors);
}
}
catch (Exception exception)
{
List<string> errors = new List<string>() { exception.Message };
return StatusCode(StatusCodes.Status500InternalServerError, errors);
}
}
But use database stored procedures with transaction is always a good choice .