c# - 何时在 DbContext 构造函数中提供 DbContextOptions 与 OnConfiguring？

Question

提供DbContext有什么区别？接受 DbContextOptions<MyFileContext> 的构造函数与包含 OnConfiguring连接数据库的方法？

两者等价吗？

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

using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.SqlServer;

namespace MyApp.Models
{
    public class MyDbContext : DbContext
    {
        // OPTION 1
        public MyDbContext(DbContextOptions<MyFileContext> options) : base(options)
        {
        }

        public DbSet<MyTable> MyTables { get; set; }

        // OPTION 2
        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            base.OnConfiguring(optionsBuilder);

            optionsBuilder.UseSqlServer(AppSettingsProvider.MySqlServerConnection);
        }

    }
}

Answer 1

Are the two are equivalent ?

这很复杂。 (但理想情况下不是)；

The DbContextOptions can be supplied to the DbContext by overriding the OnConfiguring method or externally via a constructor argument.

If both are used, OnConfiguring is applied last and can overwrite options supplied to the constructor argument.

强调我的

引用Configuring a DbContext