c# - 使用默认大小写打开枚举将无法编译。

Question

我正在尝试对枚举使用 switch 语句，如下所示:-

public enum myEnum
{
    This = 0,
    That = 1,
    TheOther = 2
}

private void doo_foo (myEnum input)
{
    switch (input)
    {
        case myEnum.This:
            // do something;
            break;
        case myEnum.That:
            // do something;
            break;
        case myEnum.TheOther:
            // do something
            break;
        case default:
            // do something;
            break;
    }
}

但这会在 case default: 行返回一个编译错误:-

Syntax error, '(' expected.

冒号下有红色小下划线。谁能看出这是怎么回事？

Answer 1

从 default 行中删除 case:

switch (input)
{
    case myEnum.This:
        // do something;
        break;
    case myEnum.That:
        // do something;
        break;
    case myEnum.TheOther:
        // do something
        break;
    default:
        // do something;
        break;
}