如何在本地创建 IConfiguration 的实例? [英] How can I create an instance of IConfiguration locally?

问题描述

我想问一下如何创建 ASP.NET Core 配置的实例，这与我在知道 appsettings.json 文件的 Controller 的构造函数中需要它时创建的实例相同

like _config = ActivatorUtilities.CreateInstance(null);

<块引用>

System.InvalidOperationException: '找不到适合类型 'Microsoft.Extensions.Configuration.IConfiguration' 的构造函数.确保类型是具体的，并且为公共构造函数的所有参数注册了服务.'

这是有道理的，因为它是接口，但它在控制器的构造函数情况下是如何工作的呢?以及如何创建一个实例?

我正在使用 MS DI

谢谢

解决方案

您可以创建一个本地的配置实例，如下所示.

IConfigurationRoot configuration = new ConfigurationBuilder().SetBasePath([PATH_WHERE_appsettings.json_RESIDES]).AddJsonFile("appsettings.json").建造();

有关详细信息，请参阅 ASP 中的配置.NET 核心

I'd want to ask how to create an instance of ASP.NET Core's Configuration, the same that's being created when I require it in Controller's constructor which knows about the appsettings.json file

like _config = ActivatorUtilities.CreateInstance<IConfiguration>(null);

System.InvalidOperationException: 'A suitable constructor for type 'Microsoft.Extensions.Configuration.IConfiguration' could not be located. Ensure the type is concrete and services are registered for all parameters of a public constructor.'

It makes sense because it is interface, but how it does work in Controller's Constructor case? and how can I create an instance of that?

I'm using MS DI

Thanks

解决方案

You can create a local instance of configuration as shown below.

IConfigurationRoot configuration = new ConfigurationBuilder()
            .SetBasePath([PATH_WHERE_appsettings.json_RESIDES])
            .AddJsonFile("appsettings.json")
            .Build();

For further information see Configuration in ASP.NET Core

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