c# - 从特定数字获取枚举

Question

我有这样的enum：

   enum Numbers
    {
        SmallerThenThree = 3,
        SmallerThenFive = 5,
        SmallerThenTen = 10,
    }

是否可以通过特定编号获取 enum的项目？例如 ：

 var numberFour = 4;
        var enumOfNumber = (Numbers)numberFour; // There should be SmallerThenFive enum type
        var numberSix = 6;
        enumOfNumber = (Numbers)numberSix; // There should be SmallerThenTen enum type

Answer 1

您可以使用反射：

var number = 4;
var enumValue = (Numbers)Enum.GetValues(typeof(Numbers))
    .Cast<int>()
    .OrderBy(v => v)
    .FirstOrDefault(v => number < v);   

// Note: enumValue will be (Numbers)0 if the value is >= 10