. NET core 2.0 MVC get configuration information

Mvc_core_config

在.net core mvc中 配置文件格式更改为json且移除了ConfigurationManager.AppSettings[xmlkey]的方法,那么，如何来获取配置信息呢？

The first step is to add the JSON file to the application

<default code> public static void Main (string[] args) {buildwebhost (args).    Run (); } public static Iwebhost Buildwebhost (string[] args) = Webhost.createdefaultbuilder (args). Usestartup<startup> ().      Build (); If you use the default method to start, you can skip this step <reason> view the source code in the Createdefaultbuilder method has been used to add profile//configuration information Processing--for the second step of the read configuration info . Configureappconfiguration ((Action<webhostbuildercontext, iconfigurationbuilder>) ((hostingContext, config) =              > {//Inject operating environment ihostingenvironment hostingenvironment = hostingcontext.hostingenvironment; Load configuration file CONFIG. Addjsonfile ("Appsettings.json", True, true). Addjsonfile (String. Format ("appsettings.{          0}.json ", (object) hostingenvironment.environmentname), True, true); Load the appropriate file according to the running environment if (hostingenvironment.isdevelopment ()) {Assembly Assembly = ASSEMBLY.L Oad (New AssemblyName (Hostingenvironment.applicationname));              if (assembly! = (assembly) null) CONFIG.            Addusersecrets (assembly, true); } config.            Addenvironmentvariables ();            if (args = = null) return; Config.      Addcommandline (args); }) To customize the Add profile please refer to the above code

Second Step reading configuration information

<code>    <Startup>    //由于在程序启动时已经配置了configuration 则可以直接通过构造方法获取配置信息    public Startup(IConfiguration configuration)    {        Configuration = configuration;    }    public IConfiguration Configuration { get; }

The third step is to get the configuration information in the controller

<code> <Startup> <method-configureservices>//Add options services.        AddOptions (); Use the configuration information for Di injection services. Configure<appsetting> (Configuration.getsection (nameof (appsetting));< related method notes > Getsection:key-value The value is similar to the dictionary value operation Configure: Di injection Key code://di injection Addsingleton global share a ioption The type services that correspond to the schangetokensource<toptions> injection parameters.                 Addsingleton<ioptionschangetokensource<toptions>> ((ioptionschangetokensource<toptions>)            New configurationchangetokensource<toptions> (name, config)); That is, actually using Addsingleton injection to achieve <source code>//<summary>//registers a Configuratio n instance which toptions would bind against. Bind the configuration instance as option to the parameter///</summary>//<typeparam name= "toptions" >the type of options be ING Configured.</typeparam>//<param name= "Services" >the <see cref= "T:microsoft.extensions.dependenc Yinjection.iservicecollection "/> To add the services to.</param>//<param name=" config ">the c Onfiguration being bound.</param>//<returns>the <see cref= "T:microsoft.extensions.dependencyi Njection. Iservicecollection "/> So, additional calls can be chained.</returns> public static Iservicecollec            tion configure<toptions> (This iservicecollection services, iconfiguration config) where toptions:class {return services.            Configure<toptions> (Microsoft.Extensions.Options.Options.DefaultName, config);            }//<summary>//registers a configuration instance which toptions would bind against. Ibid. </summary>//<typeparam name= "toptions" >the type of options being Configured.</typ Eparam>            <param name= "Services" >the <see cref= "T:microsoft.extensions.dependencyinjection.iservicecollecti On "/> To add the services to.</param>//<param name=" name ">the name of the options instance.& lt;/param>//<param name= "config" >the configuration being bound.</param>//<re Turns>the <see cref= "t:microsoft.extensions.dependencyinjection.iservicecollection"/> so that additional Calls can chained.</returns> public static iservicecollection configure<toptions> (This ISERVICEC Ollection Services, string name, IConfiguration config) where Toptions:class {if (services = = N              ull) throw new ArgumentNullException (nameof (services));                    if (config = = null) throw new ArgumentNullException (nameof (config)); Perform di injection Addsingleton globally share a type that corresponds to a ioptionschangetokensource<toptions> injection parameter                     Services. Addsingleton<ioptionschangetokensource<toptions>> ((ioptionschangetokensource<toptions>) New              configurationchangetokensource<toptions> (name, config)); Return services. Addsingleton<iconfigureoptions<toptions>> ((iconfigureoptions<toptions>) New            namedconfigurefromconfigurationoptions<toptions> (name, config));  } <Controller> public abstract class Basecontroller:controller {protected appsetting            appsetting {get; set;} Protected Basecontroller (ioptions<appsetting> option) = appsetting = option.        Value; } intro: Since the configuration information is often used in MVC, I encapsulate the related processing of getting configuration information in an abstract controller, so I just need to inherit this controller from the controller with configuration information and then get the configuration information through appsetting in the controller.

Extension description

在Startup中直接获取配置文件:public Startup(IApplicationEnvironment appEnv, IHostingEnvironment env) {   _config = new ConfigurationBuilder()            .AddJsonFile("config.json")            .AddJsonFile("appsettings.json")        .AddEnvironmentVariables()        .Build();}[https://docs.microsoft.com/zh-cn/aspnet/core/fundamentals/configuration/?view=aspnetcore-2.1&tabs=basicconfiguration](https://docs.microsoft.com/zh-cn/aspnet/core/fundamentals/configuration/?view=aspnetcore-2.1&tabs=basicconfiguration "官方教程")

Note: The appsetting that I use is the entity class that corresponds to my configuration information "can be named according to the actual situation"

欢迎各位大佬评论并指出我的错误 :)

Author:monster

since:6/4/2018 11:12:45 AM

Direction:.net Core 2.0 MVC configuration file Usage

. NET core 2.0 MVC get configuration information