C# PlatformNotSupportedException:此平台不支持Microsoft.Data.SqlClient

可能是什么错误？ 我研究了类似的问题，将版本降级到2.0是一种解决方法，但事实并非如此

DAL.dll

<ItemGroup>
    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="3.1.4" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Proxies" Version="3.1.4" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="3.1.4" />
  </ItemGroup>

UIWEBAPP.dll

<ItemGroup>
    <PackageReference Include="CKEditor" Version="3.6.4" />
    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="3.1.4" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Proxies" Version="3.1.4" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="3.1.4" />
    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="3.1.3" />
    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
  </ItemGroup>

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嘿，伙计，试试这些步骤，因为这种方法很有效

一,

二,

dotnet tool install --global dotnet-ef --version 3.0.0

<ItemGroup>
<PackageReference Include="Microsoft.EntityFrameworkCore" Version="3.0.0" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="3.0.0" />
<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="3.0.0" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="3.0.0" />

dotnet ef dbcontext scaffold "Server=serveraddresst;Database=db_name;User=db_username;Password=db_password" Microsoft.EntityFrameworkCore.SqlServer -c DataBaseContext -o Models