如何在ASP.NET 5 AppSettings中处理属性的层次结构
本文关键字:处理 属性 层次结构 AppSettings ASP NET | 更新日期: 2023-09-27 18:00:20
在ASP.NET 4中,为了组织设置,我在设置键前面加了一个小字,指示该配置的使用位置(例如key="dms:url"、"sms:fromNumber"…等)。
在ASP.NET 5中,AppSettings配置被映射到一个强类型类。我需要为"dms:url"构建什么属性?如何映射破折号&ASP.NET 5中C#属性的特殊字符?
您可以在config.json 中的层次结构中组织配置文件
{
"AppSettings": {
"SiteTitle": "PresentationDemo.Web",
"Dms": {
"Url": "http://google.com",
"MaxRetries": "5"
},
"Sms": {
"FromNumber": "5551234567",
"APIKey": "fhjkhededeudoiewueoi"
}
},
"Data": {
"DefaultConnection": {
"ConnectionString": "MyConnectionStringHere. Included to show you can use the same config file to process both strongly typed and directly referenced values"
}
}
}
我们将AppSettings定义为一个POCO类。
public class AppSettings
{
public AppSettings()
{
Dms = new Dms(); // need to instantiate (Configuration only sets properties not create the object)
Sms = new Sms(); // same
}
public string SiteTitle { get; set; }
public Dms Dms { get; set; }
public Sms Sms { get; set; }
}
public class Dms
{
public string Url { get; set; }
public int MaxRetries { get; set; }
}
public class Sms
{
public string FromNumber { get; set; }
public string ApiKey { get; set; }
}
然后,我们将配置加载到IConfigurationSourceRoot
的实例中,然后使用GetSubKey设置AppSettings的值。最佳做法是在ConfigureServices中执行此操作,并将其添加到DI容器中。
public class Startup
{
public Startup(IHostingEnvironment env)
{
// Setup configuration sources.
var configuration = new Configuration()
.AddJsonFile("config.json")
.AddJsonFile($"config.{env.EnvironmentName}.json", optional: true);
}
public void ConfigureServices(IServiceCollection services)
{
// Add Application settings to the services container.
services.Configure<AppSettings>(Configuration.GetSubKey("AppSettings"));
//Notice we can also reference elements directly from Configuration using : notation
services.AddEntityFramework()
.AddSqlServer()
.AddDbContext<ApplicationDbContext>(options =>
options.UseSqlServer(Configuration["Data:DefaultConnection:ConnectionString"]));
}
}
我们现在可以通过构造函数在控制器中提供访问权限。我在构造函数中明确设置了设置值,但您可以使用整个IOptions
public class HomeController : Controller
{
private string _title;
private string _fromNumber;
private int _maxRetries;
public HomeController(IOptions<AppSettings> settings)
{
_title = settings.Options.SiteTitle;
_fromNumber = settings.Options.Sms.FromNumber;
_maxRetries = settings.Options.Dms.MaxRetries;
}
如果你想像以前一样保持一切平坦并使用伪层次结构,你可以,但":"不是变量名的有效符号。您需要使用诸如"_"或"-"之类的有效符号。