Generic enum to int

Редактировал(а) Alexandr Fokin 2024/09/10 13:02
  
 How do I cast a generic enum to int?
https://stackoverflow.com/questions/16960555/how-do-i-cast-a-generic-enum-to-int
 public static class EnumHelper        
{
   /// <summary>
    /// Использует ExpressionTree для производительности (no boxing object)
    /// </summary>
    public static int EnumToInt<T>(this T value)
       where T : struct, Enum
        => EnumHelper.GenericEnum<T>.EnumToInt(value);

   private static class GenericEnum<T>
       where T : struct, Enum
    {
       public static readonly Func<T, int> EnumToInt;

       static GenericEnum()
        {
            {
               var inputParameter = Expression.Parameter(typeof(T));
               var body = Expression.Convert(inputParameter, typeof(int));
               var lambda = Expression.Lambda<Func<T, int>>(body, inputParameter);
                EnumToInt = lambda.Compile();
            }
        }
    }
}

 

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