前文講獲取配置文件內容的時候，是獲取默認的appsettings.json配置文件的配置，下面說明下如何進行自定義配置文件獲取

1. Json Provider

1.1 構建獨立的IConfiguration

編寫方法

????????public?static?IConfigurationRoot?LoadSettings(this?IHostEnvironment?env){return?new?ConfigurationBuilder().SetBasePath(AppDomain.CurrentDomain.BaseDirectory).AddJsonFile("common.json",?optional:?true,?reloadOnChange:?false).AddJsonFile("appsettings.json",?optional:?true,?reloadOnChange:?false).AddJsonFile($"appsettings.{env.EnvironmentName}.json",?optional:?true,?reloadOnChange:?false).AddEnvironmentVariables().Build();}

在Startup構造函數的時候進行賦值替換IConfiguration

????????private?readonly?IConfiguration?_configuration;public?Startup(IWebHostEnvironment?env){_configuration?=?env.LoadSettings();}

該操作添加的配置項，只在startup范圍生效。

1.2 在Progrom全局自定義配置

?public?static?IHostBuilder?CreateHostBuilder(string[]?args)?=>Host.CreateDefaultBuilder(args).ConfigureAppConfiguration((hostingContext,?config)?=>{var?env?=?hostingContext.HostingEnvironment;config.SetBasePath(env.ContentRootPath);config.AddJsonFile("devappsettings.json",?optional:?false,?reloadOnChange:?true);}).ConfigureWebHostDefaults(webBuilder?=>{webBuilder.UseStartup<Startup>();});

注意：添加自定義文件的目錄要注意，可能會存在因為目錄問題所以找不到配置文件的情況。

2. Memory Provider

允許我們將一個應用程序配置直接配置到內存中，而不是像傳統方式那樣子必須制定一個物理文件。

????????????var?builder?=?new?ConfigurationBuilder();var?profileCollection?=?new?Dictionary<string,?string>{{"AuthorProfile:FirstName",?"Joydip"},{"AuthorProfile:LastName",?"Kanjilal"},{"AuthorProfile:Address",?"Hyderabad,?India"}};builder.AddInMemoryCollection(profileCollection);Configuration?=?builder.Build();

使用

????????public?static?IHostBuilder?CreateHostBuilder(string[]?args)?=>Host.CreateDefaultBuilder(args).ConfigureAppConfiguration((hostingContext,?config)?=>{var?builder?=?new?ConfigurationBuilder();var?profileCollection?=?new?Dictionary<string,?string>{{"AuthorProfile:FirstName",?"Joydip"},{"AuthorProfile:LastName",?"Kanjilal"},{"AuthorProfile:Address",?"Hyderabad,?India"}};builder.AddInMemoryCollection(profileCollection);config.AddConfiguration(builder.Build());}).ConfigureWebHostDefaults(webBuilder?=>{webBuilder.UseStartup<Startup>();});

然后就可以通過IConfiguration實例去獲取了。

3. 公共類獲取配置文件

引用組件

Microsoft.Extensions.Configuration.Json

????public?class?AppSettings{private?static?IConfiguration?Configuration?{?get;?set;?}public?AppSettings(IConfiguration?configuration){Configuration?=?configuration;}///?<summary>///?封裝要操作的字符///?</summary>///?<param?name="ps"></param>///?<returns></returns>public?static?string?GetValue(params?string[]?ps){try{if?(ps.Any())return?Configuration[string.Join(":",?ps)];}catch?(Exception){?}return?"";}///?<summary>///?遞歸獲取配置信息數組///引用?Microsoft.Extensions.Configuration.Binder?包///?</summary>///?<typeparam?name="T"></typeparam>///?<param?name="ps"></param>///?<returns></returns>public?static?List<T>?App<T>(params?string[]?ps){List<T>?list?=?new?List<T>();Configuration.Bind(string.Join(":",?ps),?list);return?list;}}

參考自：https://gitee.com/laozhangIsPhi/Blog.Core

ConfigureServices中配置

services.AddSingleton(new?AppSettings(Configuration));

獲取指定配置

var?info?=?AppSettings.GetValue("Logging",?"LogLevel");

總結

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