在appsettings.json

{
      "MyArray": [
          "str1",
          "str2",
          "str3"
      ]
}

在Startup.cs

public void ConfigureServices(IServiceCollection services)
{
     services.AddSingleton<IConfiguration>(Configuration);
}

在HomeController

public class HomeController : Controller
{
    private readonly IConfiguration _config;
    public HomeController(IConfiguration config)
    {
        this._config = config;
    }
    
    public IActionResult Index()
    {
        return Json(_config.GetSection("MyArray"));
    }
}

上面是我的代码。结果是零。 如何获取数组?


当前回答

在ASP。NET Core 2.2及以后版本,我们可以在应用程序的任何地方注入IConfiguration 就像在你的例子中,你可以在HomeController中注入IConfiguration并像这样使用来获取数组。

string[] array = _config.GetSection("MyArray").Get<string[]>();

其他回答

对于从配置返回复杂JSON对象数组的情况,我调整了@djangojazz的答案,以使用匿名类型和动态而不是元组。

给定的设置部分:

"TestUsers": [
{
  "UserName": "TestUser",
  "Email": "Test@place.com",
  "Password": "P@ssw0rd!"
},
{
  "UserName": "TestUser2",
  "Email": "Test2@place.com",
  "Password": "P@ssw0rd!"
}],

你可以这样返回对象数组:

public dynamic GetTestUsers()
{
    var testUsers = Configuration.GetSection("TestUsers")
                    .GetChildren()
                    .ToList()
                    .Select(x => new {
                        UserName = x.GetValue<string>("UserName"),
                        Email = x.GetValue<string>("Email"),
                        Password = x.GetValue<string>("Password")
                    });

    return new { Data = testUsers };
}

如果你想要选择第一项的值,那么你应该这样做-

var item0 = _config.GetSection("MyArray:0");

如果你想选择整个数组的值,那么你应该这样做-

IConfigurationSection myArraySection = _config.GetSection("MyArray");
var itemArray = myArraySection.AsEnumerable();

理想情况下,您应该考虑使用官方文档建议的选项模式。这会给你带来更多的好处。

你可以像这样使用Microsoft.Extensions.Configuration.Binder包:

在你的appsettings.json中

{
      "MyArray": [
          "str1",
          "str2",
          "str3"
      ]
}

创建保存配置的对象:

 public class MyConfig
 {
     public List<string> MyArray { get; set; }
 }

在你的控制器绑定配置:

public class HomeController : Controller
{
    private readonly IConfiguration _config;
    private readonly MyConfig _myConfig = new MyConfig();

    public HomeController(IConfiguration config)
    {
        _config = config;
    }

    public IActionResult Index()
    {
        return Json(_config.Bind(_myConfig));
    }
}

从appsettings.json中获取所有section的所有值

        public static string[] Sections = { "LogDirectory", "Application", "Email" };
        Dictionary<string, string> sectionDictionary = new Dictionary<string, string>();

        List<string> sectionNames = new List<string>(Sections);
        
        sectionNames.ForEach(section =>
        {
            List<KeyValuePair<string, string>> sectionValues = configuration.GetSection(section)
                    .AsEnumerable()
                    .Where(p => p.Value != null)
                    .ToList();
            foreach (var subSection in sectionValues)
            {
                sectionDictionary.Add(subSection.Key, subSection.Value);
            }
        });
        return sectionDictionary;

在应用程序设置中添加一个级别。json:

{
  "MySettings": {
    "MyArray": [
      "str1",
      "str2",
      "str3"
    ]
  }
}

创建一个代表你的section的类:

public class MySettings
{
     public List<string> MyArray {get; set;}
}

在你的应用启动类中,绑定你的模型并将其注入到DI服务中:

services.Configure<MySettings>(options => Configuration.GetSection("MySettings").Bind(options));

在你的控制器中,从DI服务中获取配置数据:

public class HomeController : Controller
{
    private readonly List<string> _myArray;

    public HomeController(IOptions<MySettings> mySettings)
    {
        _myArray = mySettings.Value.MyArray;
    }

    public IActionResult Index()
    {
        return Json(_myArray);
    }
}

你也可以把你的整个配置模型存储在控制器的属性中,如果你需要所有的数据:

public class HomeController : Controller
{
    private readonly MySettings _mySettings;

    public HomeController(IOptions<MySettings> mySettings)
    {
        _mySettings = mySettings.Value;
    }

    public IActionResult Index()
    {
        return Json(_mySettings.MyArray);
    }
}

ASP。NET Core的依赖注入服务就像一个魔法一样:)