添加依赖项和更新模型后使用 EF 7 的应用程序出错 运行 类

Question

我正在 运行 宁 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，但是我收到一个错误并且不清楚根本原因是什么。

以下是我的 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 Method not found: 'Boolean Microsoft.Framework.DependencyInjection.ServiceCollectionExtensions.TryAdd(Microsoft.Framework.DependencyInjection.IServiceCollection, Microsoft.Framework.DependencyInjection.ServiceDescriptor). at Microsoft.Framework.DependencyInjection.LoggingServiceCollectionExtensions.AddLogging(IServiceCollection services) at Microsoft.AspNet.Hosting.WebHostBuilder.BuildHostingServices() at Microsoft.AspNet.Hosting.WebHostBuilder.Build() at Microsoft.AspNet.Loader.IIS.RuntimeHttpApplication.ApplicationStart(IHttpApplication application) at Microsoft.AspNet.Loader.IIS.HttpApplicationBase.InvokeApplicationStart(IHttpApplication application)

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 project.json 中的所有版本调整为 beta5 或 beta6。