我有一个.NET Core 1.1应用程序,在HomeController中的动作上设置了自定义属性。鉴于我需要在属性逻辑中使用配置文件(appsettings.json)中的值,是否可以在属性级别访问配置?
appsettings.json
{
"Api": {
"Url": "http://localhost/api"
}
}
HandleSomethingAttribute.cs
public class HandleSomethingAttribute : Attribute, IActionFilter
{
public void OnActionExecuting(ActionExecutingContext context)
{
// read the api url somehow from appsettings.json
}
public void OnActionExecuted(ActionExecutedContext context)
{
}
}
HomeController.cs
public class HomeController: Controller
{
[HandleSomething]
public IActionResult Index()
{
return View();
}
}
public HandleSomethingAttribute ()
{
var builder = new ConfigurationBuilder()
.SetBasePath(Directory.GetCurrentDirectory())
.AddJsonFile("appsettings.json");
Configuration = builder.Build();
string url = Configuration.GetSection("Api:Url").Value;
}
嗨,在Attribute构造函数中尝试这个。它应该工作!
我也在做同样的事情。我做了类似于Dzhambazov的解决方案,但为了获得环境名称,我使用了Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT")
。我把它放在一个静态类中的静态变量中,我可以从项目的任何地方读取它。
public static class AppSettingsConfig
{
public static IConfiguration Configuration { get; } = new ConfigurationBuilder()
.SetBasePath(Directory.GetCurrentDirectory())
.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
.AddJsonFile($"appsettings.{Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT") ?? "Production"}.json", optional: true)
.Build();
}
我可以从属性中调用它,如下所示:
public class SomeAttribute : Attribute
{
public SomeAttribute()
{
AppSettingsConfig.Configuration.GetValue<bool>("SomeBooleanKey");
}
}