How to use #if to decide which platform is being compiled for in C#

Question

In C++ there are predefined macros:

#if defined(_M_X64) || defined(__amd64__)
    // Building for 64bit target
    const unsigned long MaxGulpSize = 1048576 * 128;// megabyte = 1048576;
    const unsigned long MaxRecsCopy = 1048576 * 16;
#else
    const unsigned long MaxGulpSize = 1048576 * 8;// megabyte = 1048576;
    const unsigned long MaxRecsCopy = 1048576;
#endif

Which allows me to set constants to control the amount of memory that will be used.

Of course I can define a preprocessor variable verbatim:

#define Is64bit 1

using System;
using System.Collections.Generic;

-later-

#if Is64bit
    // Building for 64bit target
    const long MaxGulpSize = 1048576 * 128;// megabyte = 1048576;
    const long MaxRecsCopy = 1048576 * 16;
#else
    const long MaxGulpSize = 1048576 * 8;// megabyte = 1048576;
    const long MaxRecsCopy = 1048576;
#endif

I cannot find a way to detect the platform based on the values set in the configuration manager which would allow for command line building:

set de=C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\devenv.exe
set sol=E:\Some\Path\to\my.sln
"%de%" %sol% /build "Release|x86"
"%de%" %sol% /build "Release|x64"

Is there a way to detect this or will I have to build, change platform and build again?

Update: The 32/64 bit question became a moot point when the last of the 32bit Windows 7 workstations were retired so needing to compile for both platforms was no longer necessary. I think though it's worthwhile to retain this thread as the concepts can help with other preprocessor directives, targeting MS Office vs Open Office for example.

Answer 1

You can add any constants you want to the .csproj file. These can be put into conditional property groups like the one below.

 <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release|x64'">
    <DefineConstants>TRACE;X64</DefineConstants>
    ...
 </PropertyGroup>

For my Release x64 build, I have defined a X64 constant that I can use like this:

#if X64

#endif