ASP.NET核心-来自静态类的访问配置
ASP.NET核心-来自静态类的访问配置
提问于 2017-08-26 00:16:23
我想要一个访问Configuration对象的简单静态类。所有配置信息都已经从Startup类中的appsettings.json文件中读入。我只需要一个简单的方法来访问它。这个是可能的吗？
namespace MyNamespace
{
public static class Config
{
public string Username => Configuration["Username"];
public string Password => Configuration["Password"];
}
}应用程序中的任何其他位置：
string username = Config.Username;
string password = Config.Password;回答 12
Stack Overflow用户
发布于 2018-11-07 08:11:14
一个稍短的版本，基于与上面相同的原理……
public Startup(IConfiguration configuration)
{
Configuration = configuration;
StaticConfig = configuration;
}
public static IConfiguration StaticConfig { get; private set; }要在另一个静态类中使用：
string connString = Startup.StaticConfig.GetConnectionString("DefaultConnection");Stack Overflow用户
发布于 2019-04-10 02:03:44
经过大量研究，这个方法(在ASPNetCore 2.2中)可以从静态类访问appsettings.json配置，但由于某种原因，appsettings.development.json不再正确加载，这可能是我的项目中的其他原因造成的。reloadOnChange工作正常。作为奖励，它还拥有IHostingEnvironment和IHttpContextAccessor。虽然这是可行的，但我最近决定切换回更依赖注入的方法，以遵循其他人提到的范式转换。
因此，这里是访问静态类中的一些DI内容(包括配置)的许多方法之一：
AppServicesHelper.cs：
public static class AppServicesHelper
{
static IServiceProvider services = null;
/// <summary>
/// Provides static access to the framework's services provider
/// </summary>
public static IServiceProvider Services
{
get { return services; }
set
{
if (services != null)
{
throw new Exception("Can't set once a value has already been set.");
}
services = value;
}
}
/// <summary>
/// Provides static access to the current HttpContext
/// </summary>
public static HttpContext HttpContext_Current
{
get
{
IHttpContextAccessor httpContextAccessor = services.GetService(typeof(IHttpContextAccessor)) as IHttpContextAccessor;
return httpContextAccessor?.HttpContext;
}
}
public static IHostingEnvironment HostingEnvironment
{
get
{
return services.GetService(typeof(IHostingEnvironment)) as IHostingEnvironment;
}
}
/// <summary>
/// Configuration settings from appsetting.json.
/// </summary>
public static MyAppSettings Config
{
get
{
//This works to get file changes.
var s = services.GetService(typeof(IOptionsMonitor<MyAppSettings>)) as IOptionsMonitor<MyAppSettings>;
MyAppSettings config = s.CurrentValue;
return config;
}
}
}
}Startup.cs：
public Startup(IHostingEnvironment env)
{
var builder = new ConfigurationBuilder()
.SetBasePath(env.ContentRootPath)
.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true, reloadOnChange: true)
.AddEnvironmentVariables();
Configuration = builder.Build();
}
public void ConfigureServices(IServiceCollection services)
{
//...
services.AddHttpContextAccessor();//For HttpContext.
// Register the IOptions object
services.Configure<MyAppSettings>(Configuration.GetSection(nameof(MyAppSettings)));
//Explicitly register the settings object by delegating to the IOptions object so that it can be accessed globally via AppServicesHelper.
services.AddSingleton(resolver => resolver.GetRequiredService<IOptionsMonitor<MyAppSettings>>().CurrentValue);
}
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
//...
AppServicesHelper.Services = app.ApplicationServices;
//...
}控制器：
public class MyController: Controller
{
public MyController()
{
}
public MyAppSettings Config => AppServicesHelper.Config;
public async Task<IActionResult> doSomething()
{
testModel tm = await myService.GetModel(Config.Setting_1);
return View(tm);
}
}另一个类库：
public static class MyLibraryClass
{
public static string GetMySetting_ => AppServicesHelper.Config.Setting_1;
public static bool IsDev => AppServicesHelper.HostingEnvironment.IsDevelopment();
}MyAppSettings.cs是映射到appsettings.json中的MyAppSettings部分的任何类：
public class MyAppSettings
{
public string Setting_1 {get;set;}
}appsettings.json：
{
"Logging": {
"LogLevel": {
"Default": "Warning"
}
},
"AllowedHosts": "*",
"MyAppSettings": {
"Setting_1": "something"
}
}Stack Overflow用户
发布于 2017-09-05 15:37:16
我同意mcbowes，它在docs中，但是第一个例子看起来更像你need...want：
public class Program
{
public static IConfigurationRoot Configuration { get; set; }
public static void Main(string[] args = null)
{
var builder = new ConfigurationBuilder()
.SetBasePath(Directory.GetCurrentDirectory())
.AddJsonFile("appsettings.json");
Configuration = builder.Build();
Console.WriteLine($"option1 = {Configuration["option1"]}");
// Edit:
IServiceCollection services = new ServiceCollection();
services.AddOptions();
services.Configure<HelloWorldOptions>(_configuration.GetSection("HelloWorld"));
// And so on...
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/45885615
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