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?
这通常发生在vscode中，因为配置launch.json的方式不同。
基于这个答案，我不得不重新配置基本路径，配置正在搜索的DLL的路径，因为默认设置是可选的，很难在.net core 3.1和net 5.0应用程序中追踪到这一点。以下是我如何重新配置的
Program.cs:
using System;
using System.IO;
using System.Reflection;
using Microsoft.Extensions.Configuration;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Hosting;
namespace API
{
public class Program
{
public static int Main(string[] args)
{
CreateHostBuilder(args).Build().Run();
return 0;
}
public static IHostBuilder CreateHostBuilder(string[] args)
{
return Host.CreateDefaultBuilder(args)
.ConfigureAppConfiguration(c =>
{
var codeBase = Assembly.GetExecutingAssembly().Location;
var uri = new UriBuilder(codeBase);
var path = Uri.UnescapeDataString(uri.Path);
var assembyDirectory = Path.GetDirectoryName(path);
c.SetBasePath(assembyDirectory);
})
.ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.UseStartup<Startup>();
})
;
}
}
}
我可以在Startup.cs中访问配置:
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Model;
namespace API
{
public class Startup
{
public IConfiguration Configuration { get; }
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
var myOptions = Configuration.To<ApiConfig>();
services.AddAuthentication(myOptions.Secret);
services.AddControllers();
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
app.UseRouting();
app.UseAuthentication();
app.UseAuthorization();
app.UseEndpoints(endpoints => { endpoints.MapControllers(); });
}
}
}
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
只需创建一个AnyName.cs文件并粘贴以下代码。
using System;
using System.IO;
using Microsoft.Extensions.Configuration;
namespace Custom
{
static class ConfigurationManager
{
public static IConfiguration AppSetting { get; }
static ConfigurationManager()
{
AppSetting = new ConfigurationBuilder()
.SetBasePath(Directory.GetCurrentDirectory())
.AddJsonFile("YouAppSettingFile.json")
.Build();
}
}
}
必须替换YouAppSettingFile。Json文件名与您的文件名。
您的.json文件应该如下所示。
{
"GrandParent_Key" : {
"Parent_Key" : {
"Child_Key" : "value1"
}
},
"Parent_Key" : {
"Child_Key" : "value2"
},
"Child_Key" : "value3"
}
现在你可以使用它了。
不要忘记在你想要使用的类中添加引用。
using Custom;
检索值的代码。
string value1 = ConfigurationManager.AppSetting["GrandParent_Key:Parent_Key:Child_Key"];
string value2 = ConfigurationManager.AppSetting["Parent_Key:Child_Key"];
string value3 = ConfigurationManager.AppSetting["Child_Key"];
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();
}
}
这通常发生在vscode中，因为配置launch.json的方式不同。
基于这个答案，我不得不重新配置基本路径，配置正在搜索的DLL的路径，因为默认设置是可选的，很难在.net core 3.1和net 5.0应用程序中追踪到这一点。以下是我如何重新配置的
Program.cs:
using System;
using System.IO;
using System.Reflection;
using Microsoft.Extensions.Configuration;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Hosting;
namespace API
{
public class Program
{
public static int Main(string[] args)
{
CreateHostBuilder(args).Build().Run();
return 0;
}
public static IHostBuilder CreateHostBuilder(string[] args)
{
return Host.CreateDefaultBuilder(args)
.ConfigureAppConfiguration(c =>
{
var codeBase = Assembly.GetExecutingAssembly().Location;
var uri = new UriBuilder(codeBase);
var path = Uri.UnescapeDataString(uri.Path);
var assembyDirectory = Path.GetDirectoryName(path);
c.SetBasePath(assembyDirectory);
})
.ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.UseStartup<Startup>();
})
;
}
}
}
我可以在Startup.cs中访问配置:
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Model;
namespace API
{
public class Startup
{
public IConfiguration Configuration { get; }
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
var myOptions = Configuration.To<ApiConfig>();
services.AddAuthentication(myOptions.Secret);
services.AddControllers();
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
app.UseRouting();
app.UseAuthentication();
app.UseAuthorization();
app.UseEndpoints(endpoints => { endpoints.MapControllers(); });
}
}
}
