枚举0值不一致

问题描述

示例代码：

    public enum Foods
    {
        Burger,
        Pizza,
        Cake
    }

    private void button1_Click(object sender, EventArgs e)
    {
        Eat(0);   // A
        Eat((Foods)0);  // B
        //Eat(1);  // C : won't compile : cannot convert from 'int' to 'Foods'
        Eat((Foods)1);  // D
    }

    private void Eat(Foods food)
    {
        MessageBox.Show("eating : " + food);
    }

C行代码无法编译，但A行编译正常。
有一些特殊的枚举与0值，有特殊的治疗在这种情况下吗？

Code at line C won't compile, but line A compiles fine.Is there something special about an enum with 0 value that gets it special treatment in cases like this ?

推荐答案

是的，字面值0可隐式转换为任何枚举类型，并表示该类型的默认值。根据C＃语言规范，特别是关于枚举的1.10节：

Yes, the literal 0 is implicitly convertible to any enum type and represents the default value for that type. According to the C# language specification, in particular section 1.10 on enums:

这篇关于枚举0值不一致的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！