EF CodeFirst mysql 迁移异常Unable to create a 'DbContext' of type

问题过程

终端执行 dotnet ef migrations add init
出现如下错误：

Pomelo.EntityFrameworkCore.MySql
Microsoft.EntityFrameworkCore.Tools
Unable to create a 'DbContext' of type ''. The exception 'Method not found: 'Void CoreTypeMappingParameters..ctor(System.Type, Microsoft.EntityFrameworkCore.Storage.ValueConversion.ValueConverter, Microsoft.EntityFrameworkCore.ChangeTracking.ValueComparer, Microsoft.EntityFrameworkCore.ChangeTracking.ValueComparer, Microsoft.EntityFrameworkCore.ChangeTracking.ValueComparer, System.Func`3<Microsoft.EntityFrameworkCore.Metadata.IProperty,Microsoft.EntityFrameworkCore.Metadata.IEntityType,Microsoft.EntityFrameworkCore.ValueGeneration.ValueGenerator>)'.' was thrown while attempting to create an instance. For the different patterns supported at design time, see https://go.microsoft.com/fwlink/?linkid=851728

解决

在nuget上重新搜了相关的包，然后配置如下：

<PackageReference Include="Pomelo.EntityFrameworkCore.MySql" Version="8.0.0-beta.2" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="8.0.0">
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
</PackageReference>

问题得到解决：

posted @   leafroc  阅读(1387)  评论(1)  编辑  收藏  举报
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