30 lines
905 B
C#
30 lines
905 B
C#
using System;
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using System.Linq;
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using Microsoft.Extensions.Configuration;
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namespace GerstITS.Examples.Api.Configurations
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{
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public static class IConfigurationExtensions
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{
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#region Methods
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public static TEnum GetFlaggedEnum<TEnum>(this IConfiguration configuration, string key)
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where TEnum : struct, IConvertible
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{
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ThrowsAnExceptionIfTypeIsNotAnEnumeration<TEnum>();
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return (TEnum)(object)(configuration.GetSection(key)?
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.Get<TEnum[]>() ?? Enumerable.Empty<TEnum>())
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.Sum(i => (int)(object)i);
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}
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private static void ThrowsAnExceptionIfTypeIsNotAnEnumeration<TEnum>() where TEnum : struct, IConvertible
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{
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if (!typeof(TEnum).IsEnum)
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throw new InvalidOperationException($"{typeof(TEnum)} is not supported.");
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}
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#endregion
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}
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}
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