Core 3.0 升级后，无法使用 EF Core 3.0 添加迁移

Question

升级core 3.0后，无法在包管理器中添加迁移。这是我的错误

PM> Add-Migration UpdateAlertTable -Context OozymContext
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
 ---> System.TypeLoadException: Could not load type 'Microsoft.EntityFrameworkCore.Internal.ProductInfo' from assembly 'Microsoft.EntityFrameworkCore, Version=3.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor..ctor(Object reportHandler, IDictionary args)
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
   at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture)
   at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
   at System.Activator.CreateInstance(Type type, Object[] args)
   at Microsoft.EntityFrameworkCore.Tools.ReflectionOperationExecutor..ctor(String assembly, String startupAssembly, String projectDir, String dataDirectory, String rootNamespace, String language)
   at Microsoft.EntityFrameworkCore.Tools.Commands.ProjectCommandBase.CreateExecutor()
   at Microsoft.EntityFrameworkCore.Tools.Commands.MigrationsAddCommand.Execute()
   at Microsoft.EntityFrameworkCore.Tools.Commands.CommandBase.<>c__DisplayClass0_0.<Configure>b__0()
   at Microsoft.DotNet.Cli.CommandLine.CommandLineApplication.Execute(String[] args)
   at Microsoft.EntityFrameworkCore.Tools.Program.Main(String[] args)
Exception has been thrown by the target of an invocation.

Answer 1

我在升级到 3.0 版本后遇到了同样的问题。看了this，安装了Microsoft.EntityFrameworkCore.Designnuget包，问题解决

Answer 2

我在具有数据库连接字符串的链接项目中引用了 Microsoft.EntityFrameworkCore 版本 2.2.6。我升级了并且可以使用

Answer 3

包管理器控制台中的命令已更改。根据 Nuget Gallery 参考。按照下面。

Add-Migration
Drop-Database
Get-DbContext
Scaffold-DbContext
Script-Migrations
Update-Database

Answer 4

就我而言，根本原因是链接项目在 NuGet 中具有不同的 EF 版本。

Core 3.0 升级后，无法使用 EF Core 3.0 添加迁移

After Core 3.0 upgrade, impossible to add-migration with EF Core 3.0

c#

.net

.net-core-3.0

ef-core-3.0