不确定我在这里错过了什么，但我无法从我的应用程序设置中获得值。Json在我的。net核心应用程序。我有我的appsettings。json:
{
"AppSettings": {
"Version": "One"
}
}
启动:
public class Startup
{
private IConfigurationRoot _configuration;
public Startup(IHostingEnvironment env)
{
_configuration = new ConfigurationBuilder()
}
public void ConfigureServices(IServiceCollection services)
{
//Here I setup to read appsettings
services.Configure<AppSettings>(_configuration.GetSection("AppSettings"));
}
}
模型:
public class AppSettings
{
public string Version{ get; set; }
}
控制器:
public class HomeController : Controller
{
private readonly AppSettings _mySettings;
public HomeController(IOptions<AppSettings> settings)
{
//This is always null
_mySettings = settings.Value;
}
}
_mySettings总是空的。我是不是遗漏了什么?
我在WPF中遇到了类似的问题。NET Framework 5.0)
我所要做的就是登记。
services.AddSingleton<IConfiguration>(_configuration);
配置本身是这样配置的(在App.xaml.cs中):
var builder = new ConfigurationBuilder()
.SetBasePath(Directory.GetCurrentDirectory())
.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);
_configuration = builder.Build();
在我的例子中，它就像在Configuration对象上使用Bind()方法一样简单。然后将对象作为单例添加到DI中。
var instructionSettings = new InstructionSettings();
Configuration.Bind("InstructionSettings", instructionSettings);
services.AddSingleton(typeof(IInstructionSettings), (serviceProvider) => instructionSettings);
Instruction对象可以非常复杂。
{
"InstructionSettings": {
"Header": "uat_TEST",
"SVSCode": "FICA",
"CallBackUrl": "https://UATEnviro.companyName.co.za/suite/webapi/receiveCallback",
"Username": "s_integrat",
"Password": "X@nkmail6",
"Defaults": {
"Language": "ENG",
"ContactDetails":{
"StreetNumber": "9",
"StreetName": "Nano Drive",
"City": "Johannesburg",
"Suburb": "Sandton",
"Province": "Gauteng",
"PostCode": "2196",
"Email": "ourDefaultEmail@companyName.co.za",
"CellNumber": "0833 468 378",
"HomeNumber": "0833 468 378",
}
"CountryOfBirth": "710"
}
}
ASP。NET Core 3.1你可以遵循以下指南:
https://learn.microsoft.com/en-us/aspnet/core/fundamentals/configuration/?view=aspnetcore-3.1
当您创建一个新的ASP。在Program.cs中，你会有如下的配置行:
Host.CreateDefaultBuilder(args)
这将启用以下功能:
ChainedConfigurationProvider : Adds an existing IConfiguration as a
source. In the default configuration case, adds the host
configuration and setting it as the first source for the app
configuration.
appsettings.json using the JSON configuration
provider.
appsettings.Environment.json using the JSON configuration
provider. For example, appsettings.Production.json and
appsettings.Development.json.
App secrets when the app runs in the
Development environment.
Environment variables using the Environment
Variables configuration provider.
Command-line arguments using the
Command-line configuration provider.
这意味着您可以注入IConfiguration并使用字符串键获取值，甚至是嵌套值。像IConfiguration“父母:孩子”;
例子:
appsettings.json
{
"ApplicationInsights":
{
"Instrumentationkey":"putrealikeyhere"
}
}
WeatherForecast.cs
[ApiController]
[Route("[controller]")]
public class WeatherForecastController : ControllerBase
{
private static readonly string[] Summaries = new[]
{
"Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
};
private readonly ILogger<WeatherForecastController> _logger;
private readonly IConfiguration _configuration;
public WeatherForecastController(ILogger<WeatherForecastController> logger, IConfiguration configuration)
{
_logger = logger;
_configuration = configuration;
}
[HttpGet]
public IEnumerable<WeatherForecast> Get()
{
var key = _configuration["ApplicationInsights:InstrumentationKey"];
var rng = new Random();
return Enumerable.Range(1, 5).Select(index => new WeatherForecast
{
Date = DateTime.Now.AddDays(index),
TemperatureC = rng.Next(-20, 55),
Summary = Summaries[rng.Next(Summaries.Length)]
})
.ToArray();
}
}
