Unable to create an object of type 'xxContext'. Add an implementation of

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net  core 新搭建基架或操作数据库迁移时报错：

Unable to create an object of type xxContext'. Add an implementation of 'IDesignTimeDbContextFactory<xxxContext>' to the project, or see https://go.microsoft.com/fwlink/?linkid=851728 for additional patterns supported at design time.

查找相关资料，解决办法如下：

在Data文件夹，创建一个名称为：xxContextFactory 的类，类代码如下：

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