.net core 3.1 ef Migrations using the CLI data migration and synchronization

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4.1 Open cmd, execute: dotnet tool install --global dotnet-ef version as too low Enter: dotnet tool install --global dotnet-ef

4.2. Install the latest .NET Core SDK 3.0

4.3 cd D:. \ Work \ project folder (directory into the project), install the EF Design dotnet add package Microsoft.EntityFrameworkCore.Design

<ItemGroup>
    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="3.1.0">
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
      <PrivateAssets>all</PrivateAssets>
    </PackageReference>
</ItemGroup>

4.4. Verification tool is already installed

    dotnet restore
    dotnet ef

                     _/\__
               ---==/    \\
         ___  ___   |.    \|\
        | __|| __|  |  )   \\\
        | _| | _|   \_/ |  //|\\
        |___||_|       /   \\\/\\

Entity Framework Core .NET Command-line Tools 3.1.0

4.5. The first execution (new migrations)

dotnet ef migrations add initial

Build started... Build succeeded. Done. To undo this action, use 'ef migrations remove'

4.6. When there is a change model, execute change task dotnet ef migrations add testTable

And then run the program can automatically synchronize the data structure of data to initialize see MigrateHostedService.cs, can also be performed dotnet ef database update, synchronized to the database