note.txt

1/ Set web-project is the start-up project
2/ Add class "temp create db context factory" in web project:
example:
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Design;
using Microsoft.Extensions.Configuration;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using WebBlog.Database.Data;

namespace WebBlog.Api
{
    public class IdentityTempDbContextFactory : IDesignTimeDbContextFactory<ApplicationDbContext>
    {
        //////// 
        public ApplicationDbContext CreateDbContext(string[] args)
        {
            var builder = new DbContextOptionsBuilder<ApplicationDbContext>();
            IConfigurationRoot configuration = new ConfigurationBuilder()
              .SetBasePath(AppDomain.CurrentDomain.BaseDirectory)
              .AddJsonFile("appsettings.json")
              .Build();

            builder.UseSqlServer(configuration.GetConnectionString("WebBlogIdentityDBConnection"));
            return new ApplicationDbContext(builder.Options);
        }
    }
}

3/Copy appsettings.json to /bin/debug
4/ Run PowerShell command line: Add-Migration NameMigration -C DatabaseContextName
5/ Run PowerShell command line: Update-Database -C DatabaseContextName