脚手架的DbContext字符串参数“SQL”不能为空

这是我的数据库表脚手架的DbContext字符串参数“SQL”不能为空

CREATE TABLE `File` (
    `id` int(11) NOT NULL AUTO_INCREMENT, 
    `date` varchar(50) DEFAULT NULL, 
    `description` varchar(50) DEFAULT NULL, 
    `extension` varchar(50) DEFAULT NULL, 
    `path` varchar(50) DEFAULT NULL, 
    PRIMARY KEY (`id`) 
)

我用它来生成模型的命令：

Scaffold-DbContext "server=..;user id=..;password=..;database=..;sslmode=none;" MySql.Data.EntityFrameworkCore -OutputDir Models -f

的错误，我得到：

System.ArgumentException: The string argument 'sql' cannot be empty. 
    at Microsoft.EntityFrameworkCore.Utilities.Check.NullButNotEmpty(String value, String parameterName) 
    at Microsoft.EntityFrameworkCore.RelationalPropertyBuilderExtensions.HasComputedColumnSql(PropertyBuilder propertyBuilder, String sql) 
    at Microsoft.EntityFrameworkCore.Scaffolding.RelationalScaffoldingModelFactory.VisitColumn(EntityTypeBuilder builder, ColumnModel column) 
    at Microsoft.EntityFrameworkCore.Scaffolding.RelationalScaffoldingModelFactory.VisitColumns(EntityTypeBuilder builder, ICollection`1 columns) 
    at Microsoft.EntityFrameworkCore.Scaffolding.RelationalScaffoldingModelFactory.VisitTable(ModelBuilder modelBuilder, TableModel table) 
    at Microsoft.EntityFrameworkCore.Scaffolding.RelationalScaffoldingModelFactory.VisitTables(ModelBuilder modelBuilder, ICollection`1 tables) 
    at Microsoft.EntityFrameworkCore.Scaffolding.RelationalScaffoldingModelFactory.VisitDatabaseModel(ModelBuilder modelBuilder, DatabaseModel databaseModel) 
    at Microsoft.EntityFrameworkCore.Scaffolding.RelationalScaffoldingModelFactory.CreateFromDatabaseModel(DatabaseModel databaseModel) 
    at MySql.Data.EntityFrameworkCore.Design.Internal.MySQLScaffoldingModelFactory.Create(String connectionString, TableSelectionSet tableSelectionSet) 
    at Microsoft.EntityFrameworkCore.Scaffolding.Internal.ReverseEngineeringGenerator.GetMetadataModel(ReverseEngineeringConfiguration configuration) 
    at Microsoft.EntityFrameworkCore.Scaffolding.Internal.ReverseEngineeringGenerator.GenerateAsync(ReverseEngineeringConfiguration configuration, CancellationToken cancellationToken) 
    at Microsoft.EntityFrameworkCore.Design.Internal.DatabaseOperations.ScaffoldContextAsync(String provider, String connectionString, String outputDir, String dbContextClassName, IEnumerable`1 schemas, IEnumerable`1 tables, Boolean useDataAnnotations, Boolean overwriteFiles, CancellationToken cancellationToken) 
    at Microsoft.EntityFrameworkCore.Design.OperationExecutor.<ScaffoldContextImpl>d__22.MoveNext() 
    at System.Collections.Generic.EnumerableHelpers.ToArray[T](IEnumerable`1 source, Int32& length) 
    at System.Collections.Generic.EnumerableHelpers.ToArray[T](IEnumerable`1 source) 
    at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source) 
    at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.<>c__DisplayClass4_0`1.<Execute>b__0() 
    at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action) 
The string argument 'sql' cannot be empty.

它说sql参数不能为空，但我不会在任何地方使用'sql'。什么似乎是问题？

来源

2017-07-31 Thien Nguyen