c# - 添加 Controller 时无法检索模型的元数据

Question

我作为新手正在“Visual Studio 2015 社区”上学习 ASP.NET MVC 5。我正在尝试添加一个带有 Entity Framework 模型的 Controller 。

然后出现错误。我很困惑。

这是我的代码:

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

namespace TwiApp.Models
{
    public class Twilio
    {
        [Key]
        public int id { get; set; }
        public string userId { get; set; }
        public string sid { get; set; }
        public string authToken { get; set; }
        public string fromNumber { get; set; }
        public string toNumber { get; set; }
        public bool status { get; set; }
        [ForeignKey("userId")]
        public virtual ApplicationUser twi_appuser_ref { get; set; }
    }
}

我到 SQL Server 2014 的连接字符串:

<connectionStrings>
    <add name="DefaultConnection" connectionString="Data Source=localhost;Initial Catalog=TwiAppDB;Integrated Security=True"
  providerName="System.Data.SqlClient" />
</connectionStrings>

最后，我的数据库上下文文件:

using Microsoft.AspNet.Identity.EntityFramework;
using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Data.Entity.ModelConfiguration.Conventions;
using System.Linq;
using System.Web;
using TwiApp.Models;

namespace TwiApp.DAL
{
    public class DatabaseContext : IdentityDbContext<ApplicationUser>
    {
        public DatabaseContext() : base("DefaultConnection", throwIfV1Schema: false)
        {
        }

        public DbSet<Twilio> Twilio_Db { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {          
            modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
            base.OnModelCreating(modelBuilder);
        }

        public static DatabaseContext Create()
        {
            return new DatabaseContext();
        }
    }
}

到目前为止我尝试了什么:

1. ASP.NET MVC/EF Code First error: Unable to retrieve metadata for model
2. Unable to retrieve metadata - MVC application
3. Unable to Retrieve Metadata
4. MVC4 Scaffolding Add Controller gives error "Unable to retrieve metadata..."
5. Cannot create controller with Entity framework - Unable to retrieve metadata for ' '

任何答案将不胜感激。谢谢。

Answer 1

尝试按照以下方式更新您的 Twilio 类，EF 将计算出键和关系:

 public class Twilio
{
    //  [Key]
    public int Id { get; set; }
    public string sid { get; set; }
    public string authToken { get; set; }
    public string fromNumber { get; set; }
    public string toNumber { get; set; }
    public bool status { get; set; }
    //   [ForeignKey("userId")]
    public string userId { get; set; }
    public virtual ApplicationUser ApplicationUser { get; set; }
}