c#不支持宏定义，只支持编译开关。
======================================
我想加上#define xxx就编译a代码，否则编译b代码，像这样的：
#if xxx
a
#else
b
#endif
============================================
//#define Timing
#define Channel
上面两个，任意选一个，就说明开关打开了
#if Timing [#define Timing]
phy.StartInfo.FileName = "DrawTiming.exe";
#elif Channel
phy.StartInfo.FileName = "DrawChannel.exe";
#else
phy.StartInfo.FileName = "DrawPhysical.exe";
#endif
如果需要默认支持识别Debug的话
