无法解析类型 Microsoft.EntityFrameworkCore.DbContextOptions 的服务

Question

当我想使用 ASP.NET 带有视图的核心 MVC 添加控制器时：

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这是我的 DbContext class:

namespace Infrastructure
{
    public class DataContext : DbContext
    {
        public DataContext(DbContextOptions<DataContext> options) : base(options)
        {
        }

        public DbSet<Owner> owners { get; set; }
        public DbSet<ProtoFile> protoFiles { get; set; }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);
            modelBuilder.Entity<Owner>().Property(x => x.Id).HasDefaultValueSql("NEWID()");
            modelBuilder.Entity<ProtoFile>().Property(x => x.Id).HasDefaultValueSql("NEWID()");

            modelBuilder.Entity<Owner>().HasData(
                new Owner
                {
                    Id = Guid.NewGuid(),  
                    Avatar = "avatar.jpg",
                    FullName = "Mohammad AlMohammad AlMahmoud",
                    Profile = ".NET Full Stack Developer"
                }); 
        }
    }
}

我遇到了这个错误：

enter image description here

Answer 1

您必须将此代码添加到您的程序中class（如果您使用 net 6）

builder.Services.AddDbContext<DataContext>(options => 
options.UseSqlServer(builder.Configuration.GetConnectionString("DefaultConnection")));

或者如果您使用的是 net 5 或更低版本，请将其添加到启动程序中 class

services.AddDbContext<DataContext>(.....

并删除

base.OnModelCreating(modelBuilder);

Answer 2

I solved this problem when I added this code into Datacontext class


 protected override void OnConfiguring(DbContextOptionsBuilder DataContext)
    {
        optionsBuilder.UseSqlServer(@"Server=(localdb)\mssqllocaldb;Database=Test");
    }

and it was solved, but after generation the code i have some problem when i run the application , so i remove it and the app worked successfully


from Microsoft docs https://docs.microsoft.com/en-us/ef/core/dbcontext-configuration/

Answer 3

我终于通过添加 IDesignTimeDbContextFactory

修复了它

public class BloggingContextFactory : IDesignTimeDbContextFactory<BloggingContext>
{
    public BloggingContext CreateDbContext(string[] args)
    {
        var optionsBuilder = new DbContextOptionsBuilder<BloggingContext>();
        optionsBuilder.UseSqlite("Data Source=blog.db");

        return new BloggingContext(optionsBuilder.Options);
    }
}