MSBuild supports non-quoted strings in conditions

test.proj

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">

	<Target Name="Build">
		<Message Condition="$(Message) != ''" Text="Message: $(Message)" />
	</Target>

	<Import Project="$(ProjectFile)" Condition="$(ProjectFile) != ''" />
	
</Project>

Behavior:

• Run: msbuild test.proj -> nothing is done, no imports, no message

Build started 16/06/2014 03:53:22 p.m..

Build succeeded.
    0 Warning(s)
    0 Error(s)

• Run: msbuild test.proj /p:Message=Hello:

Build started 16/06/2014 03:53:31 p.m..
Project "C:\Code\Personal\vsx\DynamicSolution\test.proj" on node 1 (default targets).
Build:
  Message: Hello
Done Building Project "C:\Code\Personal\vsx\DynamicSolution\test.proj" (default targets).


Build succeeded.
    0 Warning(s)
    0 Error(s)

• Run msbuild test.proj /p:Message=Hello /p:ProjectFile=Foo.proj

Build started 16/06/2014 03:53:38 p.m..
Project "C:\Code\Personal\vsx\DynamicSolution\test.proj" on node 1 (default targets).
C:\Code\Personal\vsx\DynamicSolution\test.proj(8,2): error MSB4019: The imported project "C:\Code\Personal\vsx\DynamicS
olution\Foo.proj" was not found. Confirm that the path in the <Import> declaration is correct, and that the file exists
 on disk.
Done Building Project "C:\Code\Personal\vsx\DynamicSolution\test.proj" (default targets) -- FAILED.


Build FAILED.

"C:\Code\Personal\vsx\DynamicSolution\test.proj" (default target) (1) ->
  C:\Code\Personal\vsx\DynamicSolution\test.proj(8,2): error MSB4019: The imported project "C:\Code\Personal\vsx\Dynami
cSolution\Foo.proj" was not found. Confirm that the path in the <Import> declaration is correct, and that the file exis
ts on disk.

    0 Warning(s)
    1 Error(s)