Windows 批处理文件中等效的 Switch 语句 [英] Switch statement equivalent in Windows batch file

问题描述

我想知道是否有一种简单的方法可以根据单个表达式的值在 Windows 批处理文件中分支执行.类似于 C、C++、C#、Java、JavaScript、PHP 和其他实际编程语言中的 switch/case 块.

I wonder if there is a simple way to branch execution in a Windows batch file depending on the value of one single expression. Something akin to switch/case blocks in C, C++, C#, Java, JavaScript, PHP, and other real programming languages.

我唯一的解决方法是一个简单的 if/else 块，其中重复检查相同表达式与不同值的相等性:

My only workaround is a plain if/else block where the same expression is repeatedly checked for equality against different values:

IF "%ID%"=="0" (
  REM do something
) ELSE IF "%ID%"=="1" (
  REM do something else
) ELSE IF "%ID%"=="2" (
  REM do another thing
) ELSE (
  REM default case...
)

太蠢了.有没有更好的解决方案?

So dumb. Is there a better solution?

推荐答案

我最终使用了包含 AjV Jsy 建议的 case 表达式值的标签名称.无论如何，我使用 CALL 而不是 GOTO 跳转到正确的 case 块和 GOTO :EOF 跳转回来.以下示例代码是一个完整的批处理脚本，用于说明该想法.

I ended up using label names containing the values for the case expressions as suggested by AjV Jsy. Anyway, I use CALL instead of GOTO to jump into the correct case block and GOTO :EOF to jump back. The following sample code is a complete batch script illustrating the idea.

@ECHO OFF

SET /P COLOR="Choose a background color (type red, blue or black): "

2>NUL CALL :CASE_%COLOR% # jump to :CASE_red, :CASE_blue, etc.
IF ERRORLEVEL 1 CALL :DEFAULT_CASE # If label doesn't exist

ECHO Done.
EXIT /B

:CASE_red
  COLOR CF
  GOTO END_CASE
:CASE_blue
  COLOR 9F
  GOTO END_CASE
:CASE_black
  COLOR 0F
  GOTO END_CASE
:DEFAULT_CASE
  ECHO Unknown color "%COLOR%"
  GOTO END_CASE
:END_CASE
  VER > NUL # reset ERRORLEVEL
  GOTO :EOF # return from CALL

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