EF Core基础入门教程

    public partial class TestContext : DbContext
    {
        public TestContext()
        {
        }

        public TestContext(DbContextOptions<TestContext> options)
            : base(options)
        {
        }

        public virtual DbSet<User> User { get; set; }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            if (!optionsBuilder.IsConfigured)
            {
#warning To protect potentially sensitive information in your connection string, you should move it out of source code. See http://go.microsoft.com/fwlink/?LinkId=723263 for guidance on storing connection strings.
                optionsBuilder.UseSqlServer("Data Source=.;Initial Catalog=Test;Integrated Security=True");
            }
        }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {}
    }

    public class HomeController : Controller
    {
        private DataContext _context;
        public HomeController(DataContext context)
        {
            _context = context;
        }
        public IActionResult Index()
        {
            _context.User.Add(new User() { Name="name",Password="123"});
            _context.SaveChanges();
            //查询
            var users = _context.User.ToList();
            return View();
        }

public class BlogContext:DbContext
    {
        public BlogContext(DbContextOptions<BlogContext> options)
            : base(options)
        {
        }

        public DbSet<Blog> Blog { get; set; }
        public DbSet<Post> Post { get; set; }
    }

public class Blog
    {
        public int BlogId { get; set; }
        public string Url { get; set; }
        public virtual List<Post> Posts { get; set; }
    }

public class Post
    {
        public int PostId { get; set; }
        public string Title { get; set; }
        public string Content { get; set; }
        public int BlogId { get; set; }
        public Blog Blog { get; set; }
    }

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;
            });

            var connectionString = Configuration.GetConnectionString("DefaultConnection");
            services.AddDbContext<BlogContext>(options =>
            options.UseSqlServer(connectionString));

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

{
  "ConnectionStrings": {
    "DefaultConnection": "Data Source=.;Initial Catalog=Blog;Integrated Security=True"
  },
  "Logging": {
    "LogLevel": {
      "Default": "Information"
    }
  },
  "AllowedHosts": "*"
}