.Net EF Core IEntityTypeConfiguration之CodeFirst實現（SqlServer）

針對.net core EF框架下的CodeFirst實現（Webapi項目）

1、配置文件appsettings.json配置數據庫連接

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

2、startup 數據庫連接

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

3、IEntityTypeConfiguration 實現數據表映射

創建.net core 類庫 Rextec.SOA.Configuring

實現代碼：

 數據表通用字段映射（基礎映射類）

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

namespace Rextec.SOA.Configuring
{
    /// <summary>
    /// 通用字段映射
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public abstract class BaseConfiguring<T> : IEntityTypeConfiguration<T> where T : BaseModel
    {
        public virtual void Configure(EntityTypeBuilder<T> 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");
        }
    }
}

以用戶表映射代碼

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

namespace Rextec.SOA.Configuring
{
    /// <summary>
    /// 人員表映射
    /// </summary>
    public  class UserInfoConfiguring:BaseConfiguring<UserInfo>
    {
        public override void Configure(EntityTypeBuilder<UserInfo> 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);
        }
    }
}

通用字段實體類對象代碼

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

namespace Rextec.SOA.Repository
{
    /// <summary>
    /// 通用字段實體類
    /// </summary>
    public abstract class BaseModel
    {
        /// <summary>
        /// 主鍵
        /// </summary>
        [Key,StringLength(50)]
        public string ID { get; set; } = Guid.NewGuid().ToString();
        /// <summary>
        /// 創建人
        /// </summary>
        [Required,StringLength(50)]
        public string CreateUserID { get; set; }
        /// <summary>
        /// 創建人姓名
        /// </summary>
        public string CreateUserName { get; set; }
        /// <summary>
        /// 創建時間
        /// </summary>
        public DateTime CreateTime { get; set; } = DateTime.Now;
        /// <summary>
        /// 修改人ID
        /// </summary>
        public string ModifyUserID { get; set; }
        /// <summary>
        /// 修改人姓名
        /// </summary>
        public string ModifyUserName { get; set; }
        /// <summary>
        /// 修改日期
        /// </summary>
        public DateTime? ModifyTime { get; set; }
    }
}

人員實體類對象代碼

using System.ComponentModel.DataAnnotations.Schema;

namespace Rextec.SOA.Repository
{
    /// <summary>
    /// 用戶信息表
    /// </summary>
    [Table("UserInfo")]
    public class UserInfo:BaseModel
    {
        /// <summary>
        /// 用戶名
        /// </summary>
        public string UserName { get; set; }
        /// <summary>
        /// 登錄名
        /// </summary>
        public string LoginAccount { get; set; }
        /// <summary>
        /// 登錄密碼
        /// </summary>
        public string LoginPassword { get; set; }
        /// <summary>
        /// 聯繫電話
        /// </summary>
        public string Tel { get; set; }
        /// <summary>
        /// 郵箱
        /// </summary>
        public string Email { get; set; }
        /// <summary>
        /// 性別 0：男 1：女
        /// </summary>
        public string Sex { get; set; }
        /// <summary>
        /// 性別描述
        /// </summary>
        [NotMapped]
        public string SexDescrib { get { return Sex == "0" ? "男" : (Sex == "1" ? "女" : ""); } }
        /// <summary>
        /// 是否可用 0 否 1：是 默認可用
        /// </summary>
        public int IsEnable { get; set; } = 1;
        /// <summary>
        /// 用戶數據權限 1：本人 2：不限  
        /// </summary>
        public int DataLimit { get; set; }
        /// <summary>
        /// 是否管理員 0：否 1：是 默認否
        /// </summary>
        public int IsAdmin { get; set; }
    }
}

4、數據庫上下文代碼

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

namespace Rextec.SOA.Repository
{
    /// <summary>
    /// 數據庫上下文
    /// </summary>
    public class SOADbContext:DbContext
    {
        /// <summary>
        /// 
        /// </summary>
        /// <param name="options"></param>
        public SOADbContext(DbContextOptions<SOADbContext> options):base(options)
        {
            //Database.Migrate();//如果數據庫不存在，則創建數據庫(migrations創建)
            Database.EnsureCreated();//如果數據庫不存在則創建則創建數據庫
        }
        #region dbSet
        public virtual DbSet<UserInfo> UserInfos { get; set; }
        #endregion

        /// <summary>
        /// 數據庫表初始化
        /// </summary>
        /// <param name="modelBuilder"></param>
        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);
            try
            {
                //modelBuilder.ApplyConfiguration(new UserInfoConfiguring());//單個文件映射
                //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)
            {

            }
        }
    }
}

親測：

使用Postman 調用接口；數據庫不存在時，會自動創建數據庫

自動創建的數據表如下