How to execute the Environment Variables (env.) from Teamcity in Nant script - teamcity

Question

I am using TeamCity to build the.Net Solution using Nant script and everything works fine if I hard Code the solution path. I want to use Environment Variables from TeamCity (env.) to be used as Solution Path -->env.solution.path----- C:\a\testteamcity\Demo\deptest.sln inside Nant script test.build file:
<?xml version="1.0"?>
<project name ="first Nant file" default="compile-solution" >
<property name="bin.folder.svn" value="C:\a\testteamcity\Demo\bin123"/>
<property name="bin.folder.sln" value="C:\cicheckout\webapp\bin"/>
<target name="compile-solution">
<exec program="C:\Program Files (x86)\MSBuild\12.0\Bin\Msbuild.exe" verbose="true" >
<arg line="${environment::get-variable('env.solution.path')}" />
<arg value="/p:Configuration=Release" />
</exec>
<copy todir="${bin.folder.sln}" overwrite="true" failonerror="true">
<fileset basedir="${bin.folder.svn}">
</fileset>
</copy>
</target>
</project>
Error:Unexpected token 'Punctuation'.
Expression: ${environment::get-variable(‘env.solution.path’)}
Any Help would be great.Thanks

Answer 1

Create system.solution.path --> C:\a\testteamcity\demo\deptest.sln under System Properties (system.) in Teamcity and in Nant script-->
<?xml version="1.0"?>
<project name ="Build-Solution" default="build-solution" >
<property name="solution.path" value="${system.solution.path}" dynamic="true" unless="${property::exists('solution.path')}"/>
<!-- Build solution -->
<target name="build-solution">
<exec program="C:\Program Files (x86)\MSBuild\12.0\Bin\Msbuild.exe" verbose="true" >
<arg line="${solution.path}" />
<arg value="/p:Configuration=Release" />
</exec>
</target>
</project>