Question

程序包管理器控制台抛出错误，无法启用迁移。

错误消息是：

的类型初始值设定项＆＃39; System.Data.Entity.Migrations.DbMigrationsConfiguration`1＆＃39;扔了一个异常。

这是我的模特[员工]：

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

namespace MVCCMigration.Models
{
    public enum Gender {Male,Female,Other }
    public class Employee
    {
        [Key]
        public int EmpId { get; set; }

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

        [Required]
        public Gender Gender { get; set; }

        [Required]
        [Display(Name = "Department")]
        public int DepartmentId { get; set; }
        public virtual Department DepartmentName { get; set; }
    }

    public class Department
    { 
        [Key]
        public int DepartmentId { get; set; }

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

    }

}

我的模型[EmployeeContext]：

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

namespace MVCCMigration.Models
{
    public class EmployeeContext : DbContext
    {
        public EmployeeContext() : base("name=EmployeeContext") {


        }

        public DbSet<Department> department { get; set; }
        public DbSet<Employee> employee { get; set; }
    }
}

这是我的Web.Config：

<?xml version="1.0" encoding="utf-8"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=301880
  -->
<configuration>
 <connectionStrings>
    <add name="EmployeeContext" connectionString=" Data Source=LAPTOP-TL0BA7EM\LOCAL; Initial Catalog= EmployeeContext2016; user id = sa; Password= aaa; Integrated Security=False" providerName ="System.Data.Client"/>
  </connectionStrings>
  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  </configSections>
  <appSettings>
    <add key="webpages:Version" value="3.0.0.0" />
    <add key="webpages:Enabled" value="false" />
    <add key="ClientValidationEnabled" value="true" />
    <add key="UnobtrusiveJavaScriptEnabled" value="true" />
  </appSettings>
  <system.web>
    <compilation debug="true" targetFramework="4.5" />
    <httpRuntime targetFramework="4.5" />
  </system.web>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="v11.0" />
      </parameters>
    </defaultConnectionFactory>
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
    </providers>
  </entityFramework>
</configuration

＆GT;

在我输入enable-migrations -contexttypename EmployeeContext之后，它会抛出如上所述的错误消息：

的类型初始值设定项＆＃39; System.Data.Entity.Migrations.DbMigrationsConfiguration`1＆＃39;扔了一个异常。

请帮助。我是C＃/ ASP.NET的初学者，以及Code First迁移，我正在为教育目的尝试一些东西。非常感谢你！

程序包管理器控制台抛出错误，无法启用迁移

0 个答案: