.Net EF Core IEntityTypeConfiguration之CodeFirst实现（SqlServer）

针对.net core EF框架下的CodeFirst实现（Webapi项目）

1、配置文件appsettings.json配置数据库连接

 "ConnectionStrings": {
    "SOADBContext": "Data Source=.;Initial Catalog=RextecSOA;User=sa;Password=123456" //sqlserver
  }

2、startup 数据库连接

services.AddDbContext(options => options.UseSqlServer(Configuration.GetConnectionString("SOADBContext")));

3、IEntityTypeConfiguration 实现数据表映射

创建.net core 类库 Rextec.SOA.Configuring

实现代码：

 数据表通用字段映射（基础映射类）

using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata.Builders;
using Rextec.SOA.Repository;

namespace Rextec.SOA.Configuring
{
    /// 

    /// 通用字段映射
    /// 
    /// 
    public abstract class BaseConfiguring : IEntityTypeConfiguration where T : BaseModel
    {
        public virtual void Configure(EntityTypeBuilder builder)
        {
            builder.HasKey(x => x.ID);
            builder.Property(x => x.CreateUserID).HasMaxLength(50).IsRequired();
            builder.Property(x => x.CreateUserName).HasMaxLength(50);
            builder.Property(x => x.CreateTime).HasColumnType("datetime");
            builder.Property(x => x.ModifyUserID).HasMaxLength(50);
            builder.Property(x => x.ModifyUserName).HasMaxLength(50);
            builder.Property(x => x.ModifyTime).HasColumnType("datetime");
        }
    }
}

以用户表映射代码

using Microsoft.EntityFrameworkCore.Metadata.Builders;
using Rextec.SOA.Repository;

namespace Rextec.SOA.Configuring
{
    /// 

    /// 人员表映射
    /// 
    public  class UserInfoConfiguring:BaseConfiguring
    {
        public override void Configure(EntityTypeBuilder builder)
        {
            builder.Property(x => x.UserName).HasMaxLength(50);
            builder.Property(x => x.LoginAccount).HasMaxLength(50);
            builder.Property(x => x.LoginPassword).HasMaxLength(50);
            builder.Property(x => x.Tel).HasMaxLength(50);
            builder.Property(x => x.Email).HasMaxLength(50);
            builder.Property(x => x.Sex).HasMaxLength(50);
            builder.Property(x => x.IsEnable).HasMaxLength(1);
            builder.Property(x => x.DataLimit).HasMaxLength(1);
            builder.Property(x => x.IsAdmin).HasMaxLength(1);
        }
    }
}

通用字段实体类对象代码

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Text;

namespace Rextec.SOA.Repository
{
    /// 

    /// 通用字段实体类
    /// 
    public abstract class BaseModel
    {
        /// 

        /// 主键
        /// 
        [Key,StringLength(50)]
        public string ID { get; set; } = Guid.NewGuid().ToString();
        /// 

        /// 创建人
        /// 
        [Required,StringLength(50)]
        public string CreateUserID { get; set; }
        /// 

        /// 创建人姓名
        /// 
        public string CreateUserName { get; set; }
        /// 

        /// 创建时间
        /// 
        public DateTime CreateTime { get; set; } = DateTime.Now;
        /// 

        /// 修改人ID
        /// 
        public string ModifyUserID { get; set; }
        /// 

        /// 修改人姓名
        /// 
        public string ModifyUserName { get; set; }
        /// 

        /// 修改日期
        /// 
        public DateTime? ModifyTime { get; set; }
    }
}

人员实体类对象代码

using System.ComponentModel.DataAnnotations.Schema;

namespace Rextec.SOA.Repository
{
    /// 

    /// 用户信息表
    /// 
    [Table("UserInfo")]
    public class UserInfo:BaseModel
    {
        /// 

        /// 用户名
        /// 
        public string UserName { get; set; }
        /// 

        /// 登录名
        /// 
        public string LoginAccount { get; set; }
        /// 

        /// 登录密码
        /// 
        public string LoginPassword { get; set; }
        /// 

        /// 联系电话
        /// 
        public string Tel { get; set; }
        /// 

        /// 邮箱
        /// 
        public string Email { get; set; }
        /// 

        /// 性别 0：男 1：女
        /// 
        public string Sex { get; set; }
        /// 

        /// 性别描述
        /// 
        [NotMapped]
        public string SexDescrib { get { return Sex == "0" ? "男" : (Sex == "1" ? "女" : ""); } }
        /// 

        /// 是否可用 0 否 1：是 默认可用
        /// 
        public int IsEnable { get; set; } = 1;
        /// 

        /// 用户数据权限 1：本人 2：不限  
        /// 
        public int DataLimit { get; set; }
        /// 

        /// 是否管理员 0：否 1：是 默认否
        /// 
        public int IsAdmin { get; set; }
    }
}

4、数据库上下文代码

using System;
using System.IO;
using System.Linq;
using System.Reflection;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata.Builders;

namespace Rextec.SOA.Repository
{
    /// 

    /// 数据库上下文
    /// 
    public class SOADbContext:DbContext
    {
        /// 

        /// 
        /// 
        /// 
        public SOADbContext(DbContextOptions options):base(options)
        {
            //Database.Migrate();//如果数据库不存在，则创建数据库(migrations创建)
            Database.EnsureCreated();//如果数据库不存在则创建则创建数据库
        }
        #region dbSet
        public virtual DbSet UserInfos { get; set; }
        #endregion

        /// 

        /// 数据库表初始化
        /// 
        /// 
        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);
            try
            {
                //modelBuilder.ApplyConfiguration(new UserInfoConfiguring());//单个文件映射
                //var typesToRegister = Assembly.GetExecutingAssembly().GetTypes().Where(q => q.GetInterface(typeof(IEntityTypeConfiguration<>).FullName) != null);
                string path = AppDomain.CurrentDomain.BaseDirectory;
                var files = Directory.GetFiles(path, "Rextec.SOA.Configuring.dll");
                if (files.Length > 0)
                {
                    var typesToRegister = Assembly.LoadFile(files[0]).GetTypes().Where(q => q.GetInterface(typeof(IEntityTypeConfiguration<>).FullName) != null);
                    foreach (var type in typesToRegister)
                    {
                        if (!type.FullName.Contains("BaseConfiguring"))
                        {
                            dynamic configurationInstance = Activator.CreateInstance(type);
                            modelBuilder.ApplyConfiguration(configurationInstance);
                        }
                    }
                }
            }
            catch (Exception ex)
            {

            }
        }
    }
}

亲测：

使用Postman 调用接口；数据库不存在时，会自动创建数据库

自动创建的数据表如下