無法解析 Microsoft.EntityFrameworkCore.DbContextOptions .net6 類型的服務

Question

我正在使用 .net 6

當我將使用 VS 創建 Controller 時：

嘗試激活“Biblioteca.Data.Contexto”時無法解析服務類型“Microsoft.Entity.FrameworkCore.DbContextOptions”1[Biblioteca.Data.Contexto]。

那是我的 Model：

using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace Biblioteca.Models
{
    [Table("Livro")]
    public class Livro
    {
        [Display(Name="Id")]
        [Column ("Id")]
        [Key]
        public int Id { get; set; }

        [Display(Name = "Nome")]
        [Column("Nome")]
        [Required]
        public string Nome { get; set; }

        [Display(Name = "Arquivo")]
        [Column("Livro")]
        [Required]
        public byte[] livro { get; set; }

    }
}

這是我的背景：

using Biblioteca.Models;
using Microsoft.EntityFrameworkCore;

namespace Biblioteca.Data
{
    public class Contexto :DbContext
    {
        public  Contexto(DbContextOptions<Contexto> options) :base (options)
            { }

        public DbSet<Livro> Livro { get; set; }


    }
}

程序.cs：

using Biblioteca.Data;
using Microsoft.EntityFrameworkCore;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddControllersWithViews();

var app = builder.Build();

builder.Services.AddDbContext<Contexto>
    (options => options.UseMySql(
        "server=localhost;initial catalog=LIVRODB;uid:root;pwd:123",
        Microsoft.EntityFrameworkCore.ServerVersion.Parse("8.0.30-mysql")));

Answer 1

我不認為您可以在執行builder.Build(); - 因此，您可能構建了沒有上下文的服務集合。

換個角度試試。 所以：

builder.Services.AddDbContext<Contexto>
    (options => options.UseMySql(
        "server=localhost;initial catalog=LIVRODB;uid:root;pwd:123",
        Microsoft.EntityFrameworkCore.ServerVersion.Parse("8.0.30-mysql")));
        
var app = builder.Build();