支架-DbContext“未实现该方法或操作”。

问题描述

玩得不开心。

PM>命令运行

Scaffold-DbContext "Server=myserver;Database=mysqlserverdb;Trusted_Connection=True;" Microsoft.EntityFrameworkCore.SqlServer -Tables Settings -verbose

错误：

System.NotImplementedException：未实现该方法或操作。 $。 Scaffolding.Internal.CSharpDbContextGenerator.GenerateClass（IModel模型，字符串contextName，字符串connectionString，布尔useDataAnnotations，布尔hibitConnectionStringWarning）
at Microsoft.EntityFrameworkCore.Scaffolding.Internal.CSharpDbContextGenerator.WriteCode（IModel模型，字符串名称空间，字符串contextName，字符串connectionString，布尔值useDataAnnotations，布尔值detectConnectionStringWarning）Microsoft.EntityFrameworkCore.Scaffolding.Internal.CSharpModelGenerator.GenerateModel（IModel模型，字符串命名空间，字符串contextDir，字符串contextName，字符串connectionString，ModelCodeGenerationOptions选项）
在Microsoft.EntityFrameworkCore.Design.Internal.DatabaseOperations.ScaffoldContext（字符串提供程序，字符串connectionString，字符串outputDir，字符串outputContextDir，字符串dbContextClassName，IEnumerable 1模式，IEnumerable 1表，布尔值useDataAnnotations，布尔值overwriteFiles，布尔值useDatabaseNames）Microsoft.EntityFrameworkCore.Design.OperationExecutor.ScaffoldContextImpl（String provider，String connectionString，String outputDir，String outputDbContextDir，String dbContextClassName，IEnumerable 1 schemaFilters，IEnumer 1个表过滤器，布尔useDataAnnotations，布尔overwriteFiles，布尔useDatabaseNames）
在Microsoft.EntityFrameworkCore.Design.OperationExecutor.ScaffoldContext。<> c__DisplayClass0_1。< .ctor&b; b__0（）
<> c__DisplayClass3_0 1.b__0（）
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.Ope rationBase.Execute（Action action）`

System.NotImplementedException: The method or operation is not implemented. at Microsoft.EntityFrameworkCore.Scaffolding.ProviderCodeGenerator.GenerateUseProvider(String connectionString) at Microsoft.EntityFrameworkCore.Scaffolding.Internal.CSharpDbContextGenerator.GenerateOnConfiguring(String connectionString, Boolean suppressConnectionStringWarning) at Microsoft.EntityFrameworkCore.Scaffolding.Internal.CSharpDbContextGenerator.GenerateClass(IModel model, String contextName, String connectionString, Boolean useDataAnnotations, Boolean suppressConnectionStringWarning) at Microsoft.EntityFrameworkCore.Scaffolding.Internal.CSharpDbContextGenerator.WriteCode(IModel model, String namespace, String contextName, String connectionString, Boolean useDataAnnotations, Boolean suppressConnectionStringWarning) at Microsoft.EntityFrameworkCore.Scaffolding.Internal.CSharpModelGenerator.GenerateModel(IModel model, String namespace, String contextDir, String contextName, String connectionString, ModelCodeGenerationOptions options) 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.<>c__DisplayClass0_1.<.ctor>b__0() at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.<>c__DisplayClass3_01.b__0() at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)`

推荐答案

在安装 EF电动工具和之间>最新的Core 2.2.xx SDK ，我现在可以更改项目，以使用对.net core 2.2的下拉更改（以前只能执行2.1。

Between installing the EF power Tools and the Latest Core 2.2.x.x SDK I am now able to change my project to use dropdown change to the .net core 2.2 (it was previously only able to do 2.1.

然后使用Nuget更新等。，它终于可以工作了！

Then with Nuget updates etc.. , it finally works!

这篇关于支架-DbContext“未实现该方法或操作”。的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！