-Scaffold-DbContext 中无法识别命名空间选项

Question

根据MS Docs，Scaffold-DbContext应该接受一个可选参数-Namespace。不过，似乎Scaffold-DbContext无法识别这个参数。我错过了什么？

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命令错误：

Scaffold-DbContext "Server=.\SQLExpress;Database=Stock;Trusted_Connection=True;User Id=sa;Password=P@ssw0rd;" Microsoft.EntityFrameworkCore.SqlServer -Namespace Stock.Models.DTO

Scaffold-DbContext : A parameter cannot be found that matches parameter name 'Namespace'.
At line:1 char:151
+ ... P@ssw0rd;" Microsoft.EntityFrameworkCore.SqlServer -Namespace Stock.M ...
+                                                        ~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (:) [Scaffold-DbContext], ParameterBindingException
    + FullyQualifiedErrorId : NamedParameterNotFound,Scaffold-DbContext

安装的软件包：

  <ItemGroup>
    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="3.1.4" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="3.1.4">
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </PackageReference>
    <PackageReference Include="Microsoft.EntityFrameworkCore.Relational.Design" Version="1.1.6" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="3.1.4" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="3.1.4">
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </PackageReference>
  </ItemGroup>

Answer 1

-Namespace适用于 EF Core 5.0 及以上版本。你的版本比那个低。请升级 EF Core