CODEWITHSUNDEEP
.net-coreentity-framework-core.net-core-3.1ef-core-3.1
Mohanraj Periyannan
Mohanraj Periyannan

Reputation: 318

System.TypeLoadException: Could not load type 'Microsoft.EntityFrameworkCore.Infrastructure.DesignTimeProviderServicesAttribute'

I have using .net core 3.1 to update the model from existing database.

Try to add entity using below comment in package manager console,

dotnet ef dbcontext scaffold "Server=xxxxxxxx;Database=Test;Trusted_Connection=True;" Microsoft.EntityFrameworkCore.SqlServer --output-dir UserEntity --table users

Got the below exception,

Build started...
Build succeeded.
System.TypeLoadException: Could not load type 'Microsoft.EntityFrameworkCore.Infrastructure.DesignTimeProviderServicesAttribute' from assembly 'Microsoft.EntityFrameworkCore, Version=3.1.6.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.
   at System.ModuleHandle.ResolveTypeHandleInternal(RuntimeModule module, Int32 typeToken, RuntimeTypeHandle[] typeInstantiationContext, RuntimeTypeHandle[] methodInstantiationContext)
   at System.Reflection.RuntimeModule.ResolveType(Int32 metadataToken, Type[] genericTypeArguments, Type[] genericMethodArguments)
   at System.Reflection.CustomAttribute.FilterCustomAttributeRecord(MetadataToken caCtorToken, MetadataImport& scope, RuntimeModule decoratedModule, MetadataToken decoratedToken, RuntimeType attributeFilterType, Boolean mustBeInheritable, ListBuilder`1& derivedAttributes, RuntimeType& attributeType, IRuntimeMethodInfo& ctor, Boolean& ctorHasParameters, Boolean& isVarArg)
   at System.Reflection.CustomAttribute.AddCustomAttributes(ListBuilder`1& attributes, RuntimeModule decoratedModule, Int32 decoratedMetadataToken, RuntimeType attributeFilterType, Boolean mustBeInheritable, ListBuilder`1 derivedAttributes)
   at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, Int32 pcaCount, RuntimeType attributeFilterType)
   at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeAssembly assembly, RuntimeType caType)
   at System.Reflection.RuntimeAssembly.GetCustomAttributes(Type attributeType, Boolean inherit)
   at System.Attribute.GetCustomAttributes(Assembly element, Type attributeType, Boolean inherit)
   at System.Attribute.GetCustomAttribute(Assembly element, Type attributeType, Boolean inherit)
   at System.Reflection.CustomAttributeExtensions.GetCustomAttribute[T](Assembly element)
   at Microsoft.EntityFrameworkCore.Design.Internal.DesignTimeServicesBuilder.ConfigureProviderServices(String provider, IServiceCollection services, Boolean throwOnError)
   at Microsoft.EntityFrameworkCore.Design.Internal.DesignTimeServicesBuilder.Build(String provider)
   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.Infrastructure.DesignTimeProviderServicesAttribute' from assembly 'Microsoft.EntityFrameworkCore, Version=3.1.6.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.

Note :

Using the below entity version,

  1. Microsoft.EntityFrameworkCore.Design - 3.1.6
  2. Microsoft.EntityFrameworkCore.SqlServer - 1.1.6

Could any one help me to resolve this issue?

Thanks in advance.

Upvotes: 3

Views: 3350

Answers (1)

Karan
Karan

Reputation: 12619

Why you are using older version of Microsoft.EntityFrameworkCore.SqlServer? Try updating it to Microsoft.EntityFrameworkCore.SqlServer 3.1.6.

As I searched for the error it looks like DesignTimeProviderServicesAttribute was only supported till Entity Framework Core 1.1 which was under Microsoft.EntityFrameworkCore.Infrastructure.

As you are using newer versions Microsoft.EntityFrameworkCore.Infrastructure does not include DesignTimeProviderServicesAttribute. Verify same on MSDN here

Upvotes: 1

Related Questions