前文讲获取配置文件内容的时候,是获取默认的appsettings.json配置文件的配置,下面说明下如何进行自定义配置文件获取
1. Json Provider
1.1 构建独立的IConfiguration
编写方法
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构造函数的时候进行赋值替换IConfiguration
private readonly IConfiguration _configuration; public Startup(IWebHostEnvironment env) { _configuration = env.LoadSettings(); }
该操作添加的配置项,只在startup范围生效。
1.2 在Progrom全局自定义配置
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:添加自定义文件的目录要注意,可能会存在因为目录问题所以找不到配置文件的情况。
2. Memory Provider
允许我们将一个应用程序配置直接配置到内存中,而不是像传统方式那样子必须制定一个物理文件。
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>(); });
然后就可以通过IConfiguration实例去获取了。
3. 公共类获取配置文件
引用组件
Microsoft.Extensions.Configuration.Json
public class AppSettings { private static IConfiguration Configuration { get; set; } public AppSettings(IConfiguration configuration) { Configuration = configuration; } /// <summary> /// 封装要操作的字符 /// </summary> /// <param name="sections"></param> /// <returns></returns> public static string GetValue(params string[] sections) { try { if (sections.Any()) return Configuration[string.Join(":", sections)]; } catch (Exception) { } return ""; } /// <summary> /// 递归获取配置信息数组 ///引用 Microsoft.Extensions.Configuration.Binder 包 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="sections"></param> /// <returns></returns> public static List<T> App<T>(params string[] sections) { List<T> list = new List<T>(); Configuration.Bind(string.Join(":", sections), list); return list; } }
ConfigureServices中配置
services.AddSingleton(new AppSettings(Configuration));
获取指定配置
var info = AppSettings.GetValue("Logging", "LogLevel");
到此这篇关于.NET Core自定义配置文件的文章就介绍到这了。希望对大家的学习有所帮助,也希望大家多多支持阿兔在线工具。