根据代码生成数据库（基于.Net5）

一、引入命名空间

创建项目后，先引入命名空间，创建两个文件夹（Infrastructure和Models）

Startup的代码如下

   public class Startup
    { 
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddRazorPages();
            services.AddSession();


            services.AddDbContextPool(
                options => options.UseSqlServer("server=.; database=TestDB;Trusted_Connection=true")//Configuration.GetConnectionString())
                );
             
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Error");
            }
            app.UseSession();

            app.UseStaticFiles();

            app.UseRouting();

            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapRazorPages();
            });
        }
    }

二、创建类

创建Student类，代码如下

 public class Student
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string Email { get; set; }
    }

创建AppDbContext类，代码如下

  public class AppDbContext : DbContext
    {
        public AppDbContext(DbContextOptions options) : base(options)
        {

        }

        public DbSet Student { get; set; }
        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {

            modelBuilder.Entity().HasData(
                new Student
                {
                    Email = "41321@qq.com",
                    Id = 1,
                    Name = "Name"
                }
                );
            ;

        }
    }

三、修改配置文件appsettings.json

 增加节点：

"ConnectionStrings": {
"DBConnectiong": "server=.; database=TestDB;Trusted_Connection=true"
},

说明：server=.; database=TestDB;Trusted_Connection=true 是链接数据库的字符串；TestDB是数据库的名称；

四、进入控制台

 输入命令：Add-Migration InitialCreate

再输入命令：Update-Database

结果如下图所示：

来查看一下数据库：

数据库创建完成；