Delete identity role in asp.net core

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In this video we will discuss how to delete IdentityRole from the AspNetRoles database table using the identity api.


When the Delete button is clicked, the respective role must be deleted from the AspNetRoles table

<form asp-action="DeleteRole" asp-route-id="@role.Id" method="post">

    <span id="confirmDeleteSpan_@role.Id" style="display:none">

        <span>Are you sure you want to delete?</span>

        <button type="submit" class="btn btn-danger">Yes</button>

        <a href="#" class="btn btn-primary"

            onclick="confirmDelete('@role.Id', false)">No</a>

    </span>

    <span id="deleteSpan_@role.Id">

        <a href="#" class="btn btn-danger"

            onclick="confirmDelete('@role.Id', true)">Delete</a>

    </span>

</form>

• Delete button type is set to submit
• It is placed inside the form element and the method attribute is set to post
• So when the Delete button is clicked a POST request is issued to DeleteRole() action passing it the ID of the role to delete
• The span elements that surround the Delete, Yes and No buttons will be dynamically generated for every role on the list page.
• If you have more than one role on the page there will be more than one span element
• To ensure these span elements have unique ID's we are appending Role.Id which is a Guid and guaranteed to be unique

confirmDelete JavaScript function

function confirmDelete(uniqueId, isTrue) {

    var deleteSpan = 'deleteSpan_' + uniqueId;

    var confirmDeleteSpan = 'confirmDeleteSpan_' + uniqueId;

    if (isTrue) {

        $('#' + deleteSpan).hide();

        $('#' + confirmDeleteSpan).show();

    } else {

        $('#' + deleteSpan).show();

        $('#' + confirmDeleteSpan).hide();

    }

}

DeleteRole Action in the Controller

Use the RoleManager service DeleteAsync() method to delete the role

public class AdministrationController : Controller

{

    private readonly RoleManager<IdentityRole> roleManager;

    public AdministrationController(RoleManager<IdentityRole> roleManager)

    {

        this.roleManager = roleManager;

    }

    [HttpPost]

    public async Task<IActionResult> DeleteRole(string id)

    {

        var role = await roleManager.FindByIdAsync(id);

        if (role == null)

        {

            ViewBag.ErrorMessage = $"Role with Id = {id} cannot be found";

            return View("NotFound");

        }

        else

        {

            var result = await roleManager.DeleteAsync(role);

            if (result.Succeeded)

            {

                return RedirectToAction("ListRoles");

            }

            foreach (var error in result.Errors)

            {

                ModelState.AddModelError("", error.Description);

            }

            return View("ListRoles");

        }

    }

}