具体来说，就像这样在C＃中：

  #if（DEBUG）
调试东西
 #endif 
 

C＃具有以下预处理指令：

  #if 
 #else 
 #elif //否如果
 #endif 
 #define 
 #undef // Undefine 
 #warning / /导致预处理器触发警告
 #error //导致预处理器触发致命错误
 #line //让预处理程序知道这个源代码行来自
 #region // Codefolding 
 #endregion 
 

So I have about 10 short css files that I use with mvc app. There are like error.css login.css etc... Just some really short css files that make updating and editing easy (At least for me). What I want is something that will optimize the if else branch and not incorporate it within the final bits. I want to do something like this

if(Debug.Mode){

<link rel="stylesheet" type="text/css" href="error.css" /> 
<link rel="stylesheet" type="text/css" href="login.css" /> 
<link rel="stylesheet" type="text/css" href="menu.css" /> 
<link rel="stylesheet" type="text/css" href="page.css" /> 
} else {
<link rel="stylesheet" type="text/css" href="site.css" /> 
}

I'll have a msbuild task that will combine all the css files, minimize them and all that good stuff. I just need to know if there is a way to remove the if else branch in the final bits.

Specifically, like this in C#:

#if (DEBUG)
   Debug Stuff
#endif

C# has the following preprocessor directives:

#if 
#else 
#elif // Else If
#endif
#define
#undef // Undefine
#warning // Causes the preprocessor to fire warning
#error // Causes the preprocessor to fire a fatal error
#line // Lets the preprocessor know where this source line came from
#region // Codefolding
#endregion