ASP.NET MVC：在程序集中找不到上下文类型

Question

这是我的第一个 asp.net mvc 项目。我使用 EF 代码优先 方法并创建了一个 单独的 class 库 来编写我的模型和上下文。我还在 mvc 项目中引用了 class 库。但是现在在我尝试启用迁移时创建了几个新模型之后，它给了我一个错误。我还尝试了这里提到的所有可能的解决方案：No context type found in the assembly. ASP.NET MVC4

问题依旧。我错过了什么吗？

这是上下文 Class 的代码：

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.Entity.ModelConfiguration.Conventions;
using FYPPharmAssistant.Domain.Models;


namespace FYPPharmAssistant.Domain.DAL
{
    public class MyContext : DbContext
    {
        public MyContext()
            : base("MyConnectionString")
        {

        }
        public DbSet<GenericName> GenericNames { get; set; }
        public DbSet<Item> Items { get; set; }
        public DbSet<Manufacturer> Manufacturers { get; set; }
        public DbSet<Stock> Stocks { get; set; }
        public DbSet<PaymentStatus> PaymentStatus { get; set; }
        public DbSet<Purchase> Purchase { get; set; }
        public DbSet<PurchaseItem> PurchaseItems { get; set; }
        public DbSet<Supplier> Suppliers { get; set; }

        //avoids pluralizing table names
        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
        }
    }
}

还有我的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>
  <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>
  <connectionStrings>
    <add name="MyConnectionString" connectionString="Data Source=AVISHEKH\SQLEXPRESS; Initial Catalog= FYPPharmAssistant; Integrated Security=SSPI;" providerName="System.Data.SqlClient"/>
  </connectionStrings>
  <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>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="Microsoft.Owin" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="Microsoft.Owin.Security.OAuth" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="Microsoft.Owin.Security.Cookies" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="Microsoft.Owin.Security" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="Newtonsoft.Json" culture="neutral" publicKeyToken="30ad4fe6b2a6aeed" />
        <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Optimization" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="1.1.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-1.5.2.14234" newVersion="1.5.2.14234" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-5.2.2.0" newVersion="5.2.2.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
  <entityFramework>
    <!--
    <contexts>
      <context type="FYPPharmAssistant.Domain.DAL.MyContext, FYPPharmAssistant">
        <databaseInitializer type="FYPPharmAssistant.Domain.DAL.PharmacyInitializer, FYPPharmAssistant" />
      </context>
    </contexts> -->
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
    </providers>
  </entityFramework>
</configuration>

Answer 1

这可能对以后的人有帮助。所以我又来写了。

I just changed the Default Project to FYPPharmacyAssistant.Domain from the dropdown list in PackageManager Console and the problem is solved. FYPPharmacyAssistant.Domain is my seperate project or class library consisting of all my entities and database context class.

Answer 2

上下文需要与您的迁移配置位于同一个项目中

ASP.NET MVC：在程序集中找不到上下文类型

ASP.NET MVC : Context type not found in assembly

c#

asp.net-mvc

entity-framework

ef-code-first

asp.net-mvc-5