内容纲要
https://docs.microsoft.com/zh-cn/ef/core/miscellaneous/configuring-dbcontext
有两种配置方式，一种是
Dbcontext 构造函数和依赖注入同时使用。
public void ConfigureServices(IServiceCollection services)
一种是在OnConfiguring内配置使用
EF 中配置 DbContext ，构造函数和 OnConfiguring
https://docs.microsoft.com/zh-cn/ef/core/miscellaneous/configuring-dbcontext
有两种配置方式，一种是
Dbcontext 构造函数和依赖注入同时使用。
public void ConfigureServices(IServiceCollection services)
一种是在OnConfiguring内配置使用
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