asp.net-core – ASP.NET Core 2迁移错误.找不到匹配命令“dotnet-ef”的可执行文件

当我想向我的项目添加迁移时,我收到以下错误：

dotnet : No executable found matching command “dotnet-ef”

为了解决这个问题,我添加了以下包,但我仍然得到相同的错误.

Microsoft.EntityFrameworkCore.Design(2.0.0)
Microsoft.EntityFrameworkCore.Tools.DotNet(2.0.0)

我找到了一些解决方案,但这些解决方案基于.net-core-1而在.net-core-2中我们没有project.json文件.

更新：

这是我的.csproj文件：

<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>netcoreapp2.0</TargetFramework>
</PropertyGroup>

<ItemGroup>
<packagereference Include="Microsoft.AspNetCore.Hosting" Version="2.0.0" />
<packagereference Include="Microsoft.EntityFrameworkCore" Version="2.0.0" />
<packagereference Include="Microsoft.EntityFrameworkCore.Design" Version="2.0.0" />
<packagereference Include="Microsoft.EntityFrameworkCore.InMemory" Version="2.0.0" />
<packagereference Include="Microsoft.EntityFrameworkCore.Tools" Version="2.0.0" />
<packagereference Include="Microsoft.EntityFrameworkCore.sqlServer" Version="2.0.0" />
<packagereference Include="Microsoft.Extensions.Configuration.Json" Version="2.0.0" />
</ItemGroup>
<ItemGroup>
    <DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="2.0.0" />
</ItemGroup>
<ItemGroup>
<Reference Include="Microsoft.Extensions.Configuration">
      <HintPath>C:\Program Files\dotnet\sdk\NuGetFallbackFolder\microsoft.extensions.configuration\2.0.0\lib\netstandard2.0\Microsoft.Extensions.Configuration.dll</HintPath>
   </Reference>
</ItemGroup>

</Project>

解决方法

为了使dotnet ef工作,你需要在.csproj中添加一个DotNetCliToolReference元素,如下所示：

<DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="2.0.0" />

这需要住在ItemGroup内,例如：

<ItemGroup>
    <DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="2.0.0" />
</ItemGroup>

您还需要确保从与.csproj文件相同的位置运行dotnet ef.