C/C++/C#是否支持基于string的switch-case？？

C/C++只支持整型值(用字符常量也可以,但编译器事实上也是把字符常量量转化成了整型值的).

其实：

C/C++支持 int 和char，switch语句中的case只能是常量.是整型,字符或枚举三种.
C#支持int、char、string。

Enum其实也就是int……

From MSDN:

In ANSI C, the expressions that define the value of an enumerator constant always have int type; thus, the storage associated with an enumeration variable is the storage required for a single int value. An enumeration constant or a value of enumerated type can be used anywhere the C language permits an integer expression.

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From MSDN:

switch (expression)
{
   case constant-expression:
      statement
      jump-statement
   [default:
      statement
      jump-statement]
}

C++
The expression must be of an integral type or of a class type for which there is an unambiguous conversion to integral type.
（参考地址：http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclang/html/_pluslang_The_C.2b2b_.switch_Statement.asp）

C#
expression
An integral or string type expression.
（参考地址：http://msdn.microsoft.com/library/default.asp?url=/library/en-us/csref/html/vclrfTheSwitchStatement.asp）

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