**System.NotImplementedException: The method or operation is not implemented.**

[rumesh-smec]

I am tring to implment this for .net core 2.2 project. But getting System.NotImplementedException. Any idea?

System.NotImplementedException: The method or operation is not implemented. at Microsoft.EntityFrameworkCore.Scaffolding.ProviderCodeGenerator.GenerateUseProvider(String connectionString) at EntityFrameworkCore.Scaffolding.Handlebars.HbsCSharpDbContextGenerator.GenerateOnConfiguring(String connectionString, Boolean suppressConnectionStringWarning) at EntityFrameworkCore.Scaffolding.Handlebars.HbsCSharpDbContextGenerator.GenerateClass(IModel model, String contextName, String connectionString, Boolean useDataAnnotations, Boolean suppressConnectionStringWarning) at EntityFrameworkCore.Scaffolding.Handlebars.HbsCSharpDbContextGenerator.WriteCode(IModel model, String namespace, String contextName, String connectionString, Boolean useDataAnnotations, Boolean suppressConnectionStringWarning) at EntityFrameworkCore.Scaffolding.Handlebars.HbsCSharpModelGenerator.GenerateModel(IModel model, String namespace, String contextDir, String contextName, String connectionString, ModelCodeGenerationOptions options) at Microsoft.EntityFrameworkCore.Scaffolding.Internal.ReverseEngineerScaffolder.ScaffoldModel(String connectionString, IEnumerable1 tables, IEnumerable1 schemas, String namespace, String language, String contextDir, String contextName, ModelReverseEngineerOptions modelOptions, ModelCodeGenerationOptions codeOptions) at Microsoft.EntityFrameworkCore.Design.Internal.DatabaseOperations.ScaffoldContext(String provider, String connectionString, String outputDir, String outputContextDir, String dbContextClassName, IEnumerable1 schemas, IEnumerable1 tables, Boolean useDataAnnotations, Boolean overwriteFiles, Boolean useDatabaseNames) at Microsoft.EntityFrameworkCore.Design.OperationExecutor.ScaffoldContextImpl(String provider, String connectionString, String outputDir, String outputDbContextDir, String dbContextClassName, IEnumerable1 schemaFilters, IEnumerable1 tableFilters, Boolean useDataAnnotations, Boolean overwriteFiles, Boolean useDatabaseNames) at Microsoft.EntityFrameworkCore.Design.OperationExecutor.ScaffoldContext.<>cDisplayClass0_1.<.ctor>b0() at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.<>cDisplayClass3_0`1.b0() at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action) The method or operation is not implemented.

[tonysneed]

I need more information on what you are trying to do.

[rumesh-smec]

Thanks for your reply. I was tring to generate classes for my database at first place without any customizations, just following the steps metnioned here https://blog.tonysneed.com/2018/05/27/customize-ef-core-scaffolding-with-handlebars-templates/

The only diffrence is my database is hosted in Azure.

I will need to dig in to futher to give you more information. Will share any information if I able to troubleshoot in to further.

Do you think as per above error am I missing anything?

[tonysneed]

Can you generate entities without adding Handlebars?

[rumesh-smec]

Yes of course.

[tonysneed]

So you do not have a ScaffoldingDesignTimeServices in your project? If this class is present (with the call to AddHandlebarsScaffolding), then Handlebars templates will be used.

[tonysneed]

Can you paste here the dotnet ef command you are using?

[rumesh-smec]

Please refer below. I removed the full connection string. Other paramters are same. I have 10+ tables, but I need only one table to generate, so I am passing the -t parameter. This same cammned works when I removed the ScaffoldingDesignTimeServices class from the project.

dotnet ef dbcontext scaffold "connection-string" Microsoft.EntityFrameworkCore.SqlServer -o Models -c MyDbContext -t Status

System.NotImplementedException: The method or operation is not implemented. at Microsoft.EntityFrameworkCore.Scaffolding.ProviderCodeGenerator.GenerateUseProvider(String connectionString) at EntityFrameworkCore.Scaffolding.Handlebars.HbsCSharpDbContextGenerator.GenerateOnConfiguring(String connectionString, Boolean suppressConnectionStringWarning) at EntityFrameworkCore.Scaffolding.Handlebars.HbsCSharpDbContextGenerator.GenerateClass(IModel model, String contextName, String connectionString, Boolean useDataAnnotations, Boolean suppressConnectionStringWarning) at EntityFrameworkCore.Scaffolding.Handlebars.HbsCSharpDbContextGenerator.WriteCode(IModel model, String namespace, String contextName, String connectionString, Boolean useDataAnnotations, Boolean suppressConnectionStringWarning) at EntityFrameworkCore.Scaffolding.Handlebars.HbsCSharpModelGenerator.GenerateModel(IModel model, String namespace, String contextDir, String contextName, String connectionString, ModelCodeGenerationOptions options) at Microsoft.EntityFrameworkCore.Scaffolding.Internal.ReverseEngineerScaffolder.ScaffoldModel(String connectionString, IEnumerable1 tables, IEnumerable1 schemas, String namespace, String language, String contextDir, String contextName, ModelReverseEngineerOptions modelOptions, ModelCodeGenerationOptions codeOptions) at Microsoft.EntityFrameworkCore.Design.Internal.DatabaseOperations.ScaffoldContext(String provider, String connectionString, String outputDir, String outputContextDir, String dbContextClassName, IEnumerable1 schemas, IEnumerable1 tables, Boolean useDataAnnotations, Boolean overwriteFiles, Boolean useDatabaseNames) at Microsoft.EntityFrameworkCore.Design.OperationExecutor.ScaffoldContextImpl(String provider, String connectionString, String outputDir, String outputDbContextDir, String dbContextClassName, IEnumerable1 schemaFilters, IEnumerable1 tableFilters, Boolean useDataAnnotations, Boolean overwriteFiles, Boolean useDatabaseNames) at Microsoft.EntityFrameworkCore.Design.OperationExecutor.ScaffoldContext.<>cDisplayClass0_1.<.ctor>b0() at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.<>cDisplayClass3_0`1.b0() at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action) The method or operation is not implemented.

[rumesh-smec]

FYI - We used the same with PowerTools and it works well. Thanks for your time on helping this out.

[tonysneed]

What version of the EF Core NuGet packages are you referencing?

[tonysneed]

Do the Power Tools work when you check "Use Handlebars"?

[tonysneed]

I’m having difficulty understanding and reproducing your issue. If you still require assistance, would you please create a small sample and publish it to GitHub so I can clone and see the errors firsthand?

[tonysneed]

Closing this issue, as I'm unable to reproduce.