使用EF Core的CodeFirt 出现的问题The specified framework version '2.1' could not be parsed
今天使用了一下EF Core的Code First，进行数据库迁移的的时候报错了：数据库
The specified framework version '2.1' could not be parsed框架
解决方法：在DbContext的csporj工程文件里指定一下运行时框架3d
<RuntimeFrameworkVersion>2.1.6</RuntimeFrameworkVersion>blog
添加完成后再次运行迁移指令：dotnet ef migrations add <记录名>继承
结果又爆出了新的错误接口
Unable to create an object of type 'EFDbContext'. Add an implementation of 'IDesignTimeDbContextFactory<EFDbContext>' to the project, or see https://go.microsoft.com/fwlink/?linkid=851728 for additional patterns supported at design time.ci
出现这种错误是由于Dbcontext没有在Web项目里面，因此他找不到连接字符串，没办法实例化DbContext字符串
解决方案：咱们在Dbcontext的同级目录新建一个类DesignTimeDbContextFactoryget
让这个类继承IDesignTimeDbContextFactory接口it
写完后再次执行迁移指令，发现迁移成功
出现这种问题，我我的认为应该是个人DbContext没有建到Web项目下的缘由，我以为若是引入一下Nuget的Asp.NETMVC包应该也能解决问题，不过我就不去试了哈哈哈哈哈
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每一个你不满意的现在，都有一个你没有努力的曾经。
- 1. The SDK 'Microsoft.NET.Sdk' specified could not be found.
- 2. 记今天用Qt遇到的"the pro could not be parsed"
- 3. 错误DateTimeParseException could not be parsed at index 0
- 4. 解决“ImportError: DLL load failed: The specified module could not be found”问题
- 5. oracle出现The Network Adapter could not establish the connection的问题
- 6. The specified module could not be found的解决办法
- 7. The '_imaging' module for the PIL could not be imported: DLL load failed: The specified module could
- 8. XenDesktop Error: The hosting infrastructure could not be reached at the specified address
- 9. ImportError: No module named 'gdal' 与 DLL load failed: The specified procedure could not be found
- 10. 出现The user specified as a definer ('root'@'%') does not exist 的问题