Edit role in asp.net core

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In this video we will discuss how to edit an existing role in asp.net core using the Identity API.

Navigating to Edit Role View


The following view displays the list of all roles. 




When Edit button on one of the roles is clicked, we want to go to EditRole action in the AdministrationController. We are using asp-action and asp-controller tag helpers to do that. We also want to pass the ID of the role to edit. We pass the Role ID using asp-route-id tag helper.

<a asp-controller="Administration" asp-action="EditRole"

   asp-route-id="@role.Id" class="btn btn-primary">

    Edit

</a>

asp-route-id tag helper includes the Role ID in the URL 

/Administration/EditRole/7360350f-2662-4842-8a78-58a308043477

Edit Role View

We want the Edit Role View to be as shown below.

• Role ID is non-editable, so keep the input element disabled
• Only Role Name is editable
• Display the list of Users in the Role

Edit Role View Model

The following EditRoleViewModel class carries the data EditRole view needs. Users property holds the list of Users in this role. The constructor initializes Users property so we do not get NULL reference exceptions.

using System.Collections.Generic;

using System.ComponentModel.DataAnnotations;

namespace EmployeeManagement.ViewModels

{

    public class EditRoleViewModel

    {

        public EditRoleViewModel()

        {

            Users = new List<string>();

        }

        public string Id { get; set; }

        [Required(ErrorMessage = "Role Name is required")]

        public string RoleName { get; set; }

        public List<string> Users { get; set; }

    }

}

Edit Role Action Methods

// Role ID is passed from the URL to the action

[HttpGet]

public async Task<IActionResult> EditRole(string id)

{

    // Find the role by Role ID

    var role = await roleManager.FindByIdAsync(id);

    if (role == null)

    {

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

        return View("NotFound");

    }

    var model = new EditRoleViewModel

    {

        Id = role.Id,

        RoleName = role.Name

    };

    // Retrieve all the Users

    foreach (var user in userManager.Users)

    {

        // If the user is in this role, add the username to

        // Users property of EditRoleViewModel. This model

        // object is then passed to the view for display

        if (await userManager.IsInRoleAsync(user, role.Name))

        {

            model.Users.Add(user.UserName);

        }

    }

    return View(model);

}

// This action responds to HttpPost and receives EditRoleViewModel

[HttpPost]

public async Task<IActionResult> EditRole(EditRoleViewModel model)

{

    var role = await roleManager.FindByIdAsync(model.Id);

    if (role == null)

    {

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

        return View("NotFound");

    }

    else

    {

        role.Name = model.RoleName;

        // Update the Role using UpdateAsync

        var result = await roleManager.UpdateAsync(role);

        if (result.Succeeded)

        {

            return RedirectToAction("ListRoles");

        }

        foreach (var error in result.Errors)

        {

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

        }

        return View(model);

    }

}

Edit Role View

@model EditRoleViewModel

@{

    ViewBag.Title = "Edit Role";

}

<h1>Edit Role</h1>

<form method="post" class="mt-3">

    <div class="form-group row">

        <label asp-for="Id" class="col-sm-2 col-form-label"></label>

        <div class="col-sm-10">

            <input asp-for="Id" disabled class="form-control">

        </div>

    </div>

    <div class="form-group row">

        <label asp-for="RoleName" class="col-sm-2 col-form-label"></label>

        <div class="col-sm-10">

            <input asp-for="RoleName" class="form-control">

            <span asp-validation-for="RoleName" class="text-danger"></span>

        </div>

    </div>

    <div asp-validation-summary="All" class="text-danger"></div>

    <div class="form-group row">

        <div class="col-sm-10">

            <button type="submit" class="btn btn-primary">Update</button>

            <a asp-action="ListRoles" class="btn btn-primary">Cancel</a>

        </div>

    </div>

    <div class="card">

        <div class="card-header">

            <h3>Users in this role</h3>

        </div>

        <div class="card-body">

            @if (Model.Users.Any())

            {

                foreach (var user in Model.Users)

                {

                    <h5 class="card-title">@user</h5>

                }

            }

            else

            {

                <h5 class="card-title">None at the moment</h5>

            }

        </div>

        <div class="card-footer">

            <a href="#" class="btn btn-primary" style="width:auto">Add Users</a>

            <a href="#" class="btn btn-primary" style="width:auto">Remove Users</a>

        </div>

    </div>

</form>