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?
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();
}
}
appsetting.json
{
"Settings": {
"ProjectName": "Sample Project"
}
}
定义一个具有相同属性名的类:
public class Settings
{
public string ProjectName { get; set; }
}
在Startup.cs中添加配置:
public void ConfigureServices(IServiceCollection services)
{
services.Configure<Settings>(Configuration.GetSection("Settings"));
}
注入控制器:
public class TestController : Controller
{
private readonly Settings _settings;
public TestController(IOptions<Settings> settings)
{
_settings = settings.Value;
}
[AllowAnonymous]
public async Task<IActionResult> test()
{
var _projectname = _settings.ProjectName;
return View();
}
}
这里是一个关于。net框架和Core: web的抽象。Config, app.config和appsettings.json
static SafeDictionary<string, string> _appSettings;
public static SafeDictionary<string, string> AppSettings {
get {
if (_appSettings == null)
{
_appSettings = ConfigurationManager.AppSettings
.ToDictionary()
.ToSafe();
BuildAppSettings( JsonAppSettings, "");
}
return _appSettings;
}
}
static SafeDictionary<string, string> _connectionStrings;
public static SafeDictionary<string, string> ConnectionStrings
{
get
{
if (_connectionStrings == null)
{
_connectionStrings = ConfigurationManager.ConnectionStrings
.Cast<ConnectionStringSettings>()
.ToDictionary(x => x.Name, x => x.ConnectionString)
.ToSafe();
foreach (var jp in JsonAppSettings["ConnectionStrings"].Cast<JProperty>())
_connectionStrings.Add(jp.Name, jp.Value.ToString() );
}
return _connectionStrings;
}
}
https://github.com/bitministry/common
假设在appsettings.json中有这样的值。
"MyValues": {
"Value1": "Xyz"
}
方法一:不进行依赖注入
在.cs文件中:
static IConfiguration conf = (new ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory()).AddJsonFile("appsettings.json").Build());
public static string myValue1= conf["MyValues:Value1"].ToString();
方法二:依赖注入(推荐)
在Startup.cs文件:
public IConfiguration Configuration { get; }
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public void ConfigureServices(IServiceCollection services)
{
...
services.AddServices(Configuration);
}
在你的控制器中:
public class TestController : ControllerBase
{
private string myValue1 { get; set; }
public TestController(IConfiguration configuration)
{
this.myValue1 = configuration.GetValue<string>("MyValues:Value1");
}
}