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
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(); });
}
}
}
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"
}
}
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");
}
}
