Enterprise Framework

Entity Framework Error:

Unable to resolve service for type 'Microsoft.EntityFrameworkCore.Migrations.IMigrator'. This is often because no database provider has been configured for this DbContext. A provider can be configured by overriding the DbContext.OnConfiguring method or by using AddDbContext on the application service provider. If AddDbContext is used, then also ensure that your DbContext type accepts a DbContextOptions<TContext> object in its constructor and passes it to the base constructor for DbContext.

Solution:

Verify the connectionstring in the appsettings.json file.

{
  "ConnectionStrings": {
    "CustomerDb":  "Server=(localdb)\\mssqllocaldb;Database=Customer;Trusted_Connection=True;"
  }
}

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.Configure<CookiePolicyOptions>(options =>
            {
                // This lambda determines whether user consent for non-essential cookies is needed for a given request.
                options.CheckConsentNeeded = context => true;
                options.MinimumSameSitePolicy = SameSiteMode.None;
            });

            services.AddDbContext<AppDbContext>(options => options.UseSqlServer(Configuration.GetConnectionString("CustomerDb")));

            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
        }

How To: Unobtrusive Javascript - Manually Add/Remove Required Rule and Message.  

<script type="text/javascript">
    $(function () {

        var addRequired = function () {
            // Manually add required fields to certain fields
            $('#scheduledLockDate').rules('add', {
                required: true,
                messages: {
                    required: "The Scheduled Lock Date is required"
                }
            });
            $('#scheduledDisposeDate').rules('add', {
                required: true,
                messages: {
                    required: "The Scheduled Dispose Date is required"
                }
            });
            $('#issueDate').rules('add', {
                required: true,
                messages: {
                    required: "The Issue Date is required"
                }
            });
        }

        // This will remove the manually required fields
        var removeRequired = function () {
            // Manually remove required fields to certain controls
            $('#scheduledLockDate').rules('remove', 'required');
            $('#scheduledDisposeDate').rules('remove', 'required');
            $('#issueDate').rules('remove', 'required');
        }

        // Handle the form submit method
        $('#workspaceForm').submit(function (e) {
            e.preventDefault();
            var form = this;

            // Trigger Form Validation
            var isValid = $('#workspaceForm').valid();

            if (!isValid) {
                // Exit out
                return false;
            }

            form.submit();
        });

        //Manually add the required fields
        addRequired();

        //Manually remvoe the required fields
        removeRequired();
    });
</script>