以前，一切正常，当我安装EFCore.Bulk扩展时，出现一个错误询问Microsoft.Bcl.AsyncInterfaces，安装它时，出现了一个异常：
InvalidOperationException: The database provider attempted to register an implementation of the 'IRelationalTypeMappingSource' service. This is not a service defined by EF and as such must be registered as a provider-specific service using the 'TryAddProviderSpecificServices' method.
我在此配置中使用PostgreSQL， “ Npgsql”版本=“ 4.1.3.1” “ Npgsql.EntityFrameworkCore.PostgreSQL” Version =“ 3.1.1.1”
我不知道为什么会这样吗。