asp.net-core – 运行Add-Migration时无法加载程序集Microsoft.E

发布时间：2020-12-16 07:34:35 所属栏目：asp.Net 来源：网络整理

导读：我用以下.csproj创建了一个类库项目： Project Sdk="Microsoft.NET.Sdk" PropertyGroup TargetFrameworknetcoreapp1.1/TargetFramework /PropertyGroup ItemGroup PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="1.1.1" / Packa

我用以下.csproj创建了一个类库项目：

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>netcoreapp1.1</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="1.1.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="1.1.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.sqlserver.Design" Version="1.1.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="1.1.0" />
  </ItemGroup>

</Project>

运行命令时：

Add-Migration -Name Test -Context TestContext

我收到以下错误：

System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.EntityFrameworkCore.Design,Culture=neutral,PublicKeyToken=null'. The system cannot find the file specified.
File name: 'Microsoft.EntityFrameworkCore.Design,PublicKeyToken=null'
   at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName,String codeBase,Evidence assemblySecurity,RuntimeAssembly locationHint,StackCrawlMark& stackMark,IntPtr pPrivHostBinder,Boolean throwOnFileNotFound,Boolean forIntrospection,Boolean suppressSecurityChecks,IntPtr ptrLoadContextBinder)
   at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef,RuntimeAssembly reqAssembly,IntPtr ptrLoadContextBinder)
   at System.Reflection.Assembly.Load(AssemblyName assemblyRef)
   at Microsoft.EntityFrameworkCore.Tools.ReflectionOperationExecutor..ctor(String assembly,String startupAssembly,String projectDir,String contentRootPath,String dataDirectory,String rootNamespace,String environment)
   at Microsoft.EntityFrameworkCore.Tools.Commands.ProjectCommandBase.CreateExecutor()
   at Microsoft.EntityFrameworkCore.Tools.Commands.MigrationsAddCommand.Execute()
   at Microsoft.DotNet.Cli.CommandLine.CommandLineApplication.Execute(String[] args)
   at Microsoft.EntityFrameworkCore.Tools.Program.Main(String[] args)
Could not load file or assembly 'Microsoft.EntityFrameworkCore.Design,PublicKeyToken=null'. The system cannot find the file specified.

但是,已经安装了Microsoft.EntityFrameworkCore.Design.

我正在使用Visual Studio Community 2017(VisualStudio / 15.0.0 26228.9)

我错过了什么？

解决方法

它在添加Microsoft.EntityFrameworkCore.Tools.DotNet并将dotnet工具的版本更改为1.0.0-msbuild2-final后工作,现在我的.csproj是：

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>netcoreapp1.1</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="1.1.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="1.1.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.sqlserver.Design" Version="1.1.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="1.0.0-msbuild2-final" />
    <DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="1.0.0-msbuild2-final" />
  </ItemGroup>

</Project>

（编辑：李大同）

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