.NET Core 配置

下面的代碼演示瞭如何在.NET Core中使用「內存配置」：

    /// <summary>
    /// 獲取格式設置
    /// </summary>
    /// <returns></returns>
    public static FormatSettings GetFormatSettings()
    {
      // Key使用冒號：分隔路徑，實現層級化
      Dictionary<string, string> initialData = new Dictionary<string, string>
      {
        // 時間格式化
        ["Format:DateTime:LongDatePattern"] = "dddd, MMMM d, yyyy",
        ["Format:DateTime:LongTimePattern"] = "h:mm:ss tt",
        ["Format:DateTime:ShortDatePattern"] = "M/d/yyyy",
        ["Format:DateTime:ShortTimePattern"] = "h:mm tt",

        // 金額格式化
        ["Format:CurrencyDecimal:Digits"] = "2",
        ["Format:CurrencyDecimal:Symbol"] = "$",
      };
      var source = new MemoryConfigurationSource
      {
        InitialData = initialData
      };

      IConfiguration configuration = new ConfigurationBuilder()
              .Add(source)
              .Build().GetSection("Format");


      IOptions<FormatSettings> optionsAccessor = new ServiceCollection()
          .AddOptions()
          .Configure<FormatSettings>(configuration)
          .BuildServiceProvider()
          .GetService<IOptions<FormatSettings>>();

      FormatSettings settings = optionsAccessor.Value;

      return settings;
    }

    /// <summary>
    /// 格式設置類
    /// </summary>
    public class FormatSettings
    {
      public DateTimeFormatSettings DateTime { get; set; }
      public CurrencyDecimalFormatSettings CurrencyDecimal { get; set; }

    }

    /// <summary>
    /// 時間格式化設置
    /// </summary>
    public class DateTimeFormatSettings
    {
      public string LongDatePattern { get; set; }
      public string LongTimePattern { get; set; }
      public string ShortDatePattern { get; set; }
      public string ShortTimePattern { get; set; }
    }

    /// <summary>
    /// 貨幣格式化設置
    /// </summary>
    public class CurrencyDecimalFormatSettings
    {
      public int Digits { get; set; }
      public string Symbol { get; set; }
    }