添加依赖项和更新模型类后,使用EF 7运行应用程序时出错

Question

我正在运行MVC 6和EF 7并且已经更改了我的模型并希望运行应用程序,但是我收到错误并且不清楚根本原因是什么.

下面是我的project.json的片段

"dependencies": {
"EntityFramework.Commands": "7.0.0-beta5",
"EntityFramework.SqlServer": "7.0.0-beta5",
"Microsoft.AspNet.Antiforgery": "1.0.0-beta6",
"Microsoft.AspNet.Authentication.Cookies": "1.0.0-beta5",
"Microsoft.AspNet.Authentication.Facebook": "1.0.0-beta5",
"Microsoft.AspNet.Authentication.Google": "1.0.0-beta5",
"Microsoft.AspNet.Authentication.MicrosoftAccount": "1.0.0-beta5",
"Microsoft.AspNet.Authentication.Twitter": "1.0.0-beta5",
"Microsoft.AspNet.Diagnostics": "1.0.0-beta5",
"Microsoft.AspNet.Diagnostics.Entity": "7.0.0-beta5",
"Microsoft.AspNet.Identity.EntityFramework": "3.0.0-beta5",
"Microsoft.AspNet.Mvc": "6.0.0-beta5",
"Microsoft.AspNet.Mvc.TagHelpers": "6.0.0-beta5",
"Microsoft.AspNet.Server.IIS": "1.0.0-beta5",
"Microsoft.AspNet.Server.WebListener": "1.0.0-beta5",
"Microsoft.AspNet.Session": "1.0.0-beta6",
"Microsoft.AspNet.StaticFiles": "1.0.0-beta5",
"Microsoft.AspNet.Tooling.Razor": "1.0.0-beta5",
"Microsoft.Framework.Configuration.Abstractions": "1.0.0-beta5",
"Microsoft.Framework.Configuration.Json": "1.0.0-beta5",
"Microsoft.Framework.Configuration.UserSecrets": "1.0.0-beta5",
"Microsoft.Framework.Logging": "1.0.0-beta5",
"Microsoft.Framework.Logging.Console": "1.0.0-beta5",
"Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0-beta5"
},

以下是网页错误.

System.MissingMethodException未找到方法:'Boolean Microsoft.Framework.DependencyInjection.ServiceCollectionExtensions.TryAdd(Microsoft.Framework.DependencyInjection.IServiceCollection,Microsoft.Framework.DependencyInjection.ServiceDescriptor).Microsoft.AspNet.Loader.IIS.RuntimeHttpApplication.ApplicationStart上的Microsoft.AspNet.Hosting.WebHostBuilder.Build()中的Microsoft.AspNet.Hosting.WebHostBuilder.BuildHostingServices()上的Microsoft.Framework.DependencyInjection.LoggingServiceCollectionExtensions.AddLogging(IServiceCollection services) (IHttpApplication应用程序)在Microsoft.AspNet.Loader.IIS.HttpApplicationBase.InvokeApplicationStart(IHttpApplication应用程序)

Answer 1

从一个测试版到另一个测试版有很多重大变化.

因此,我建议您将所有版本project.json与beta5或beta6 对齐.