您的启动项目“项目”未引用 Microsoft.EntityFrameworkCore.Design

Question

您的启动项目“项目”未引用 Microsoft.EntityFrameworkCore.Design

Bla*_*tus 8 entity-framework nuget-package

我正在使用 EntityFrameworkCore 版本 2.2.2 构建 WPF 应用程序

但是，当我想Add-Migration输出错误时...

Your startup project 'project' doesn't reference Microsoft.EntityFrameworkCore.Design. This package is required for the Entity Framework Core Tools to work. Ensure your startup project is correct, install the package, and try again.

我不知道为什么会发生这种情况，因为我可以在出现此错误之前使用它。

这是我的packages.config文件

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="Costura.Fody" version="3.3.2" targetFramework="net461" />
  <package id="Fody" version="4.0.2" targetFramework="net461" developmentDependency="true" />
  <package id="Microsoft.CSharp" version="4.5.0" targetFramework="net461" />
  <package id="Microsoft.Data.Sqlite.Core" version="2.2.2" targetFramework="net461" />
  <package id="Microsoft.DotNet.PlatformAbstractions" version="2.1.0" targetFramework="net461" />
  <package id="Microsoft.EntityFrameworkCore" version="2.2.2" targetFramework="net461" />
  <package id="Microsoft.EntityFrameworkCore.Abstractions" version="2.2.2" targetFramework="net461" />
  <package id="Microsoft.EntityFrameworkCore.Analyzers" version="2.2.2" targetFramework="net461" />
  <package id="Microsoft.EntityFrameworkCore.Design" version="2.2.2" targetFramework="net461" />
  <package id="Microsoft.EntityFrameworkCore.Relational" version="2.2.2" targetFramework="net461" />
  <package id="Microsoft.EntityFrameworkCore.Sqlite" version="2.2.2" targetFramework="net461" />
  <package id="Microsoft.EntityFrameworkCore.Sqlite.Core" version="2.2.2" targetFramework="net461" />
  <package id="Microsoft.EntityFrameworkCore.Tools" version="2.2.2" targetFramework="net461" developmentDependency="true" />
  <package id="Microsoft.Extensions.Caching.Abstractions" version="2.2.0" targetFramework="net461" />
  <package id="Microsoft.Extensions.Caching.Memory" version="2.2.0" targetFramework="net461" />
  <package id="Microsoft.Extensions.Configuration" version="2.2.0" targetFramework="net461" />
  <package id="Microsoft.Extensions.Configuration.Abstractions" version="2.2.0" targetFramework="net461" />
  <package id="Microsoft.Extensions.Configuration.Binder" version="2.2.0" targetFramework="net461" />
  <package id="Microsoft.Extensions.DependencyInjection" version="2.2.0" targetFramework="net461" />
  <package id="Microsoft.Extensions.DependencyInjection.Abstractions" version="2.2.0" targetFramework="net461" />
  <package id="Microsoft.Extensions.DependencyModel" version="2.1.0" targetFramework="net461" />
  <package id="Microsoft.Extensions.Logging" version="2.2.0" targetFramework="net461" />
  <package id="Microsoft.Extensions.Logging.Abstractions" version="2.2.0" targetFramework="net461" />
  <package id="Microsoft.Extensions.Options" version="2.2.0" targetFramework="net461" />
  <package id="Microsoft.Extensions.Primitives" version="2.2.0" targetFramework="net461" />
  <package id="Newtonsoft.Json" version="9.0.1" targetFramework="net461" />
  <package id="Remotion.Linq" version="2.2.0" targetFramework="net461" />
  <package id="SQLitePCLRaw.bundle_green" version="1.1.12" targetFramework="net461" />
  <package id="SQLitePCLRaw.core" version="1.1.12" targetFramework="net461" />
  <package id="SQLitePCLRaw.lib.e_sqlite3.linux" version="1.1.12" targetFramework="net461" />
  <package id="SQLitePCLRaw.lib.e_sqlite3.osx" version="1.1.12" targetFramework="net461" />
  <package id="SQLitePCLRaw.lib.e_sqlite3.v110_xp" version="1.1.12" targetFramework="net461" />
  <package id="SQLitePCLRaw.provider.e_sqlite3.net45" version="1.1.12" targetFramework="net461" />
  <package id="System.Buffers" version="4.4.0" targetFramework="net461" />
  <package id="System.Collections.Immutable" version="1.5.0" targetFramework="net461" />
  <package id="System.ComponentModel.Annotations" version="4.5.0" targetFramework="net461" />
  <package id="System.Diagnostics.DiagnosticSource" version="4.5.0" targetFramework="net461" />
  <package id="System.Interactive.Async" version="3.2.0" targetFramework="net461" />
  <package id="System.Memory" version="4.5.1" targetFramework="net461" />
  <package id="System.Numerics.Vectors" version="4.4.0" targetFramework="net461" />
  <package id="System.Runtime.CompilerServices.Unsafe" version="4.5.1" targetFramework="net461" />
  <package id="System.Runtime.InteropServices.RuntimeInformation" version="4.0.0" targetFramework="net461" />
</packages>

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该软件包已安装。

非常感谢任何帮助。

Answer 1

Sim*_*mon 7

Add-Migration由于您使用 Costura 嵌入程序集，因此可能会感到困惑。尝试删除 costura 以查看是否可以解决问题。

#$&&$*&$** 我刚刚花了 3 个小时在这上面，这就是 Costura!!!!!,! (2认同)

Answer 2

Tah*_*aha 5

我确实使用此命令安装了它并且它有效！

我正在使用 .net core 版本 3.1.1

dotnet add package Microsoft.EntityFrameworkCore.Design --version 3.1.1

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太棒了，它对我有用:)只需根据“youproject.context.csproj”适应正确的“--version” (2认同)

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