.Net之配置文件自定义

dotNET跨平台 今天

以下文章来源于鹏祥 ，作者AZRNG

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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;        }    }

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

ConfigureServices中配置

services.AddSingleton(new AppSettings(Configuration));

获取指定配置

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