Question

当我尝试

dotnet ef dbcontext scaffold name=myconnection Npgsql.EntityFrameworkCore.PostgreSQL -o Models -v^

失败，并显示以下

System.TypeLoadException: Could not load type 'Microsoft.EntityFrameworkCore.Metadata.RelationalAnnotations' from assembly 'Microsoft.EntityFrameworkCore.Relational, Version=3.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.
   at Npgsql.EntityFrameworkCore.PostgreSQL.Scaffolding.Internal.NpgsqlDatabaseModelFactory.GetExtensions(NpgsqlConnection connection, DatabaseModel databaseModel)
   at Npgsql.EntityFrameworkCore.PostgreSQL.Scaffolding.Internal.NpgsqlDatabaseModelFactory.Create(DbConnection dbConnection, DatabaseModelFactoryOptions options)
   at Npgsql.EntityFrameworkCore.PostgreSQL.Scaffolding.Internal.NpgsqlDatabaseModelFactory.Create(String connectionString, DatabaseModelFactoryOptions options)
   at Microsoft.EntityFrameworkCore.Scaffolding.Internal.ReverseEngineerScaffolder.ScaffoldModel(String connectionString, DatabaseModelFactoryOptions databaseOptions, ModelReverseEngineerOptions modelOptions, ModelCodeGenerationOptions codeOptions)
   at Microsoft.EntityFrameworkCore.Design.Internal.DatabaseOperations.ScaffoldContext(String provider, String connectionString, String outputDir, String outputContextDir, String dbContextClassName, IEnumerable`1 schemas, IEnumerable`1 tables, Boolean useDataAnnotations, Boolean overwriteFiles, Boolean useDatabaseNames)
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.ScaffoldContextImpl(String provider, String connectionString, String outputDir, String outputDbContextDir, String dbContextClassName, IEnumerable`1 schemaFilters, IEnumerable`1 tableFilters, Boolean useDataAnnotations, Boolean overwriteFiles, Boolean useDatabaseNames)
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.ScaffoldContext.<>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)
Could not load type 'Microsoft.EntityFrameworkCore.Metadata.RelationalAnnotations' from assembly 'Microsoft.EntityFrameworkCore.Relational, Version=3.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.

我尝试了很多东西。我需要使用v3，因为设计数据库的天才决定不向多个表添加主键。

要重现此内容： -在postgres中创建没有主键的数据库 -安装.netcore sdk 3x -创建一个新项目（我尝试过控制台和mvc都无济于事），然后将连接字符串添加到appsettings.json

-安装以下nuget软件包

<PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="3.0.0-preview6.19307.2" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="3.0.0-preview6.19304.10" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="3.0.0-preview6.19304.10" />
<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="3.0.0-preview6.19304.10" />
<PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="3.0.0-preview5" />

-

AFAIK，此过程应为所有表格提供模型。我想念什么？

Postgres：为什么不使用CLI的EF Core 3支架

0 个答案: