使用Add-Migration xxx时报错汇总

前言：abp中使用这个命令时，会出现比较多的问题，有无法识别的，也有缺少组件的，这里汇总以下我遇到情况，也解决下遇到同样问题的同学

报错目录：

问题1描述：使用Add-Migration xxx，控制台输出

 

Your target project 'xxx.EntityFrameworkCore.DbMigrations' doesn't reference EntityFramework. 
This package is required for the Entity Framework Core Tools to work. 
Ensure your target project is correct, install the package, and try again.

 

 

 

问题1解决方案：

打开NuGet，所有项目已安装的EntityFrameworkCore.Tools(下文用Tools代替)与EntityFrameworkCore.Design(下文用Design代替)卸载，DbMigrations重新安装Tools与Design，保证EntityFrameworkCore.Tools与EntityFrameworkCore.Design版本对应，过程中可能要求其他层安装Tools与Design，根据提示的错误说那个项目缺少引用就引用Tools或者Design。

问题1备注：解决Tools与Design后，可能会出现

 

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
 ---> System.TypeLoadException: Method 'Create' in type 'Microsoft.EntityFrameworkCore.SqlServer.Query.Internal.SqlServerSqlTranslatingExpressionVisitorFactory' from assembly 'Microsoft.EntityFrameworkCore.SqlServer, Version=3.1.6.0, Culture=neutral, PublicKeyToken=adb9793829ddae60' does not have an implementation.
   at Microsoft.Extensions.DependencyInjection.SqlServerServiceCollectionExtensions.AddEntityFrameworkSqlServer(IServiceCollection serviceCollection)
   at Microsoft.EntityFrameworkCore.SqlServer.Infrastructure.Internal.SqlServerOptionsExtension.ApplyServices(IServiceCollection services)
   at Microsoft.EntityFrameworkCore.Internal.ServiceProviderCache.ApplyServices(IDbContextOptions options, ServiceCollection services)
   at Microsoft.EntityFrameworkCore.Internal.ServiceProviderCache.<>c__DisplayClass4_0.<GetOrAdd>g__BuildServiceProvider|3()
   at Microsoft.EntityFrameworkCore.Internal.ServiceProviderCache.<>c__DisplayClass4_0.<GetOrAdd>b__2(Int64 k)
   at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
   at Microsoft.EntityFrameworkCore.Internal.ServiceProviderCache.GetOrAdd(IDbContextOptions options, Boolean providerRequired)
   at Microsoft.EntityFrameworkCore.DbContext..ctor(DbContextOptions options)
   at Volo.Abp.EntityFrameworkCore.AbpDbContext`1..ctor(DbContextOptions`1 options)
   at Pro212.EntityFrameworkCore.DbMigrations.EntityFrameworkCore.Pro212MigrationsDbContext..ctor(DbContextOptions`1 options) in D:\abp\Pro212\src\Pro212.EntityFrameworkCore.DbMigrations\EntityFrameworkCore\Pro212MigrationsDbContext.cs:line 11
   at Pro212.EntityFrameworkCore.DbMigrations.EntityFrameworkCore.Pro212MigrationsDbContextFactory.CreateDbContext(String[] args) in D:\abp\Pro212\src\Pro212.EntityFrameworkCore.DbMigrations\EntityFrameworkCore\Pro212MigrationsDbContextFactory.cs:line 20
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
   at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.CreateContextFromFactory(Type factory, Type contextType)
   at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.<>c__DisplayClass16_0.<FindContextFactory>b__1()
   at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.CreateContext(Func`1 factory)
   at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.CreateContext(String contextType)
   at Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.AddMigration(String name, String outputDir, String contextType, String namespace)
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.AddMigrationImpl(String name, String outputDir, String contextType, String namespace)
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.AddMigration.<>c__DisplayClass0_0.<.ctor>b__0()
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.<>c__DisplayClass3_0`1.<Execute>b__0()
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)
Exception has been thrown by the target of an invocation.

 

此错误说EntityFrameworkCore.SqlServer版本问题，重新安装EntityFrameworkCore.SqlServer，同样与Tools与Design版本对应即可。

 

其他错误待更新。