使用VS Code开发.NET Core 0007 - 添加AppsettingsHelper公共方法

一、在 Common 中创建AppsettingsHelper.cs

安裝 Nugget 包：Microsoft.Extensions.Configuration.Json

    public class AppsettingsHelper
    {
        static IConfiguration Configuration { get; set; }
        static string contentPath { get; set; }

        public AppsettingsHelper(string contentPath)
        {
            string Path = "appsettings.json";

            //根据环境变量区分appsettings
            Path = $"appsettings.{Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT")}.json";

            Configuration = new ConfigurationBuilder()
               .SetBasePath(contentPath)//引用Microsoft.Extensions.Configuration.Json 包
               .Add(new JsonConfigurationSource { Path = Path, Optional = false, ReloadOnChange = true })//这样的话，可以直接读目录里的json文件，而不是 bin 文件夹下的，所以不用修改复制属性
               .Build();
        }

        public AppsettingsHelper(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        /// <summary>
        /// 封装要操作的字符
        /// </summary>
        /// <param name="sections">节点配置</param>
        /// <returns></returns>
        public static string app(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
        /// </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>();
            // 引用 Microsoft.Extensions.Configuration.Binder 包
            Configuration.Bind(string.Join(":", sections), list);
            return list;
        }
    }

二、在 Startup 中引用

//添加拓展services
services.AddSingleton(new AppsettingsHelper(Configuration));