EFCore7Study/EFCore7Study.DataService/AppDbContext2.cs

using EFCore7Study.DataService.Models;

using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Infrastructure.Internal;
using Microsoft.Extensions.DependencyInjection;

namespace EFCore7Study.DataService
{
    /// <summary>
    /// 多构造函数
    /// 为使用工厂方式注册，合并为一个
    /// </summary>
    public class AppDbContext2 : DbContext
    {
        private string? _connectString;

        //因为先执行的 base(options),到此处时AppDbContext2已经注册完成，连接字符串实际上是用不了的。当然换成其它参数或用在其它地方是可以的。
        public AppDbContext2(DbContextOptions<AppDbContext2> options, string? connectString = null)
        : base(options)
        {
            _connectString = connectString;
        }


        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            if (!optionsBuilder.IsConfigured)
            {
                if (string.IsNullOrWhiteSpace(_connectString))
                {
                    _connectString = @"Server=127.0.0.1\SQL2019;Database=EFCore7Study;User Id=sa;Password=gly-bicijinlian;Encrypt=True;TrustServerCertificate=True;";
                }

                optionsBuilder
                    .UseSqlServer(_connectString)
                    .EnableSensitiveDataLogging();
            }
        }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.Entity<Account>().ToTable("Account");

            base.OnModelCreating(modelBuilder);
        }

        public DbSet<Account> Accounts { get; set; }
    }
}