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Dotnet core 3.1 web api-当前上下文中不存在 “配置” 名称

我正在使用dotnet core 3.1创建一个Web API，并且无法简单地获取配置设置。这里是错误:
当前上下文中不存在 “配置” 名称
开始.

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。Net Framework API Controller无法识别路由属性

我已经创建了一个API控制器使用。Net Framework如下所示:
Public class ApplicationUsersController : ApiController
{
[路由 ("api/ApplicationUser/{username}/{password}")]
[

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