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public class DateTimeFormatOptions
{
    ...
    public string LongDatePattern { get; set; }
    public string LongTimePattern { get; set; }
    public string ShortDatePattern { get; set; }
    public string ShortTimePattern { get; set; }
}

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public class DateTimeFormatOptions
{
    ...
    public DateTimeFormatOptions (IConfiguration config)
    {
        LongDatePattern = config["LongDatePattern"];
        LongTimePattern = config["LongTimePattern"];
        ShortDatePattern = config["ShortDatePattern"];
        ShortTimePattern = config ["ShortTimePattern"];
    }
}

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public class Program
{
    public static void Main()
    {
        var source = new Dictionary<string, string>
        {
            ["longDatePattern"] = "dddd, MMMM d, yyyy",
            ["longTimePattern"] = "h:mm:ss tt",
            ["shortDatePattern"] = "M/d/yyyy",
            ["shortTimePattern"] = "h:mm tt"
        };

        var config = new ConfigurationBuilder()
            .Add(new MemoryConfigurationSource { InitialData = source })
            .Build();

        var options = new DateTimeFormatOptions(config);
        Console.WriteLine($"LongDatePattern: {options.LongDatePattern}");
        Console.WriteLine($"LongTimePattern: {options.LongTimePattern}");
        Console.WriteLine($"ShortDatePattern: {options.ShortDatePattern}");
        Console.WriteLine($"ShortTimePattern: {options.ShortTimePattern}");
    }
}

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public class CurrencyDecimalFormatOptions
{
    public int Digits { get; set; }
    public string Symbol { get; set; }

    public CurrencyDecimalFormatOptions (IConfiguration config)
    {
        Digits = int.Parse(config["Digits"]);
        Symbol = config["Symbol"];
    }
}

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public class FormatOptions
{
    public DateTimeFormatOptions DateTime { get; set; }
    public CurrencyDecimalFormatOptions CurrencyDecimal { get; set; }

    public FormatOptions (IConfiguration config)
    {
        DateTime = new DateTimeFormatOptions ( config.GetSection("DateTime"));
        CurrencyDecimal = new CurrencyDecimalFormatOptions (config.GetSection("CurrencyDecimal"));
    }
}

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Key	Value
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
Format:CurrencyDecimal:Digits	2
Format:CurrencyDecimal:Symbol	$

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public class Program
{
    public static void Main()
    {
        var source = new Dictionary<string, string>
        {
            ["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",

            ["format:currencyDecimal:digits"] = "2",
            ["format:currencyDecimal:symbol"] = "$",
        };
        var configuration = new ConfigurationBuilder()
                .Add(new MemoryConfigurationSource { InitialData = source })
                .Build();

        var options = new FormatOptions(configuration.GetSection("Format"));
        var dateTime = options.DateTime;
        var currencyDecimal = options.CurrencyDecimal;

        Console.WriteLine("DateTime:");
        Console.WriteLine($"\tLongDatePattern: {dateTime.LongDatePattern}");
        Console.WriteLine($"\tLongTimePattern: {dateTime.LongTimePattern}");
        Console.WriteLine($"\tShortDatePattern: {dateTime.ShortDatePattern}");
        Console.WriteLine($"\tShortTimePattern: {dateTime.ShortTimePattern}");

        Console.WriteLine("CurrencyDecimal:");
        Console.WriteLine($"\tDigits:{currencyDecimal.Digits}");
        Console.WriteLine($"\tSymbol:{currencyDecimal.Symbol}");
    }
}

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