从 Startup 类访问 Configuration 对象 [英] Access to Configuration object from Startup class

问题描述

我想从我的 ASP.NET vNext 项目的许多控制器中访问我公司的 Active Directory，并且我将域名插入到我的 config.json 文件中，因此我可以从 Configuration 类中访问它.我发现每次我想访问我的 config.json 时总是实例化一个新的 Configuration 对象很重，有没有办法通过 IConfiguration API 访问初始化到 Startup 类中的 Configuration 类?

I would like to access to the Active Directory from my company in many controllers from my ASP.NET vNext project, and I inserted the domain name into my config.json file, so I can access it from the Configuration class. I find it heavy to always instantiate a new Configuration object at every time I want to access to my config.json, is there any way through the IConfiguration API to access to the Configuration class initialized into the Startup class ?

推荐答案

如何做到这一点的示例:

An example of how you can do this:

假设您有一个如下所示的 config.json:

Let's assume you have a config.json like below:

{
    "SomeSetting1": "some value here",
    "SomeSetting2": "some value here",
    "SomeSetting3": "some value here",
    "ActiveDirectory": {
        "DomainName": "DOMAIN-NAME-HERE"
    }
}

创建一个包含您的选项信息的 POCO 类型:

Create a POCO type having your option information:

public class ActiveDirectoryOptions
{
    public string DomainName { get; set; }
}

在 Startup.cs 中，配置服务时:

In Startup.cs, when configuring services:

services.Configure<ActiveDirectoryOptions>(optionsSetup =>
{
    //get from config.json file
    optionsSetup.DomainName = configuration.Get("ActiveDirectory:DomainName");
});

在所有想要获取此配置设置的控制器中，执行类似...这里的选项由 DI 系统注入:

In all controllers which want to get this config setting, do something like...Here the options is injected by the DI system:

public class HomeController : Controller
{
    private readonly IOptions<ActiveDirectoryOptions> _activeDirectoryOptions;

    public HomeController(IOptions<ActiveDirectoryOptions> activeDirectoryOptions)
    {
        _activeDirectoryOptions = activeDirectoryOptions;
    }

    public IActionResult Index()
    {
        string domainName = _activeDirectoryOptions.Options.DomainName;

        ........
    }
}

<小时>

回复评论:
我能想到几个选项:

---

Responding to the comment:
There are couple of options that I can think of:

1. 在动作中，你可以做

1. From within the action, you can do

var options = HttpContext.RequestServices.GetRequiredService

你可以有一个用FromServicesAttribute修饰的动作参数.该属性将导致从 DI 中检索参数值.示例:

You can have a parameter to the action which is decorated with FromServicesAttribute. This attribute will cause the parameter value to be retrieved from the DI. Example:

public IActionResult Index([FromServices] IOptions options)

我更喜欢 #2 而不是 #1，因为在单元测试的情况下，它会为您提供所有相关部分的信息.

I prefer #2 over #1 as in case of unit testing it gives you information on all dependent pieces.

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