Error: The method or operation is not implemented. while scaffolding MYSQL Database

问题

I'm using .net core 2.0. I have installed the following nuget Packages: 1: Microsoft.AspNetCore.All 2: Microsoft.EntityFrameworkCore.Tools 3: MySql.Data.EntityFrameworkCore 4: MySql.Data.EntityFrameworkCore.Design

When I try to scaffold the database using the following command in the package manager console

Scaffold-DbContext "server=localhost;port=3306;user=root;password=mypass;database=SampleDB" MySql.Data.EntityFrameworkCore -OutputDir SampleEFMySQL -f

I get the following Error.

System.NotImplementedException: The method or operation is not implemented.
   at MySql.Data.EntityFrameworkCore.Scaffolding.Internal.MySQLDatabaseModelFactory.Create(String connectionString, IEnumerable`1 tables, IEnumerable`1 schemas)
   at Microsoft.EntityFrameworkCore.Scaffolding.Internal.RelationalScaffoldingModelFactory.Create(String connectionString, IEnumerable`1 tables, IEnumerable`1 schemas, Boolean useDatabaseNames)
   at Microsoft.EntityFrameworkCore.Scaffolding.Internal.ModelScaffolder.Generate(String connectionString, IEnumerable`1 tables, IEnumerable`1 schemas, String projectPath, String outputPath, String rootNamespace, String contextName, Boolean useDataAnnotations, Boolean overwriteFiles, Boolean useDatabaseNames)
   at Microsoft.EntityFrameworkCore.Design.Internal.DatabaseOperations.ScaffoldContext(String provider, String connectionString, String outputDir, 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 dbContextClassName, IEnumerable`1 schemaFilters, IEnumerable`1 tableFilters, Boolean useDataAnnotations, Boolean overwriteFiles, Boolean useDatabaseNames)
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.ScaffoldContext.<>c__DisplayClass0_1.<.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)
The method or operation is not implemented.

How do I work with MySQL using Entity Framwork Core(in .net core 2.0)

回答1:

This appears to be a bug in Connector/NET: bug 89310, also reported as bug 90368.

Many people (e.g., here and here) recommend switching to Pomelo.EntityFrameworkCore.MySql instead (to use MySQL with Entity Framework Core on .NET Core).

来源：https://stackoverflow.com/questions/48616506/error-the-method-or-operation-is-not-implemented-while-scaffolding-mysql-datab