Question

我将数据模型从EF4移植到EF6 Code First。我在尝试创建数据库时收到以下消息。我无法理解造成这种情况的原因。我没有任何Context，AstNode或JSParser实体。它也没有查看Models名称空间：

var context = QPDataContext.Create();
var session = context.DataSessions.FirstOrDefault(ds => ds.DataSessionId = sessionId);

引发此异常：

{"One or more validation errors were detected during model generation:

   QPWebRater.DAL.Context: : EntityType 'Context' has no key defined. Define the key for this EntityType. 
   QPWebRater.DAL.AstNode: : EntityType 'AstNode' has no key defined. Define the key for this EntityType.
   QPWebRater.DAL.JSParser: : EntityType 'JSParser' has no key defined. Define the key for this EntityType.
   (many more similar errors snipped). 
"}

这是我的数据库上下文（我已经简化了一点）：

QPWebRater.DAL.QPDataContext.cs：

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Data.Entity.Core;
using System.Data.Entity.Validation;
using System.Diagnostics;
using System.Linq;
using System.Text.RegularExpressions;
using System.Web;
using Microsoft.Ajax.Utilities;
using QPWebRater.Models;
using QPWebRater.Utilities;

namespace QPWebRater.DAL
{
    public class QPDataContext : DbContext
    {
        public QPDataContext()
            : base("DefaultConnection")
        {
            Database.SetInitializer<QPDataContext>(new CreateDatabaseIfNotExists<QPDataContext>());
        }

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

        public DbSet<DataSession> DataSession { get; set; }
        public DbSet<Document> Documents { get; set; }
        public DbSet<Driver> Drivers { get; set; }
        public DbSet<Location> Locations { get; set; }
        public DbSet<Lookup> Lookups { get; set; }
        public DbSet<Quote> Quotes { get; set; }
        public DbSet<Vehicle> Vehicles { get; set; }
        public DbSet<Violation> Violations { get; set; }
     }
}

QPWebRater.Models.DatabaseModels.cs：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace QPWebRater.Models
{

    public partial class DataSession
    {
        public DataSession()
        {
            this.Vehicles = new HashSet<Vehicle>();
            this.Drivers = new HashSet<Driver>();
            ...
        }

        public string DataSessionId { get; set; }
        public System.DateTime Timestamp { get; set; }

        ...
    }

    public partial class Document
    {
        public int DocumentId { get; set; }
        public int QuoteId { get; set; }
        public string DocumentType { get; set; }
        public string Url { get; set; }
        public string Description { get; set; }

        public virtual Quote Quote { get; set; }
    }

    public partial class Driver
    {
        public Driver()
        {
            this.Violations = new HashSet<Violation>();
        }

        public int DriverId { get; set; }
        public string DataSessionId { get; set; }
        ...
    }
}

Answer 1

我通过检查所有DbSet定义来解决这个问题。我在削减数据模型的同时也进行了升级。我删除了Lookup模型类，但忽略了删除DbSet<Lookup> Lookups { get; set; }属性。

这导致课程被解析为Microsoft.Ajax.Utilities.Lookup。在运行时，EntityFramework尝试添加一个失败的相应数据库表。如果遇到类似问题，请仔细检查DbSet属性中的泛型类型。

实体类型＆＃39; AstNode＆＃39;没有定义键

1 个答案: