How do I prepend a prefix to Ant's srcfile marker within the apply task?

Given the f开发者_如何学Pythonollowing ant task:

    <apply executable="${mstest}" addsourcefile="false">
        <arg value="/resultsfile:TestResults.trx" />
        <arg value="/testsettings:ReleaseCodeCoverage.testsettings" />
        <arg value="/detail:errormessage" />
        <srcfile />
        <fileset dir="bin/${buildType}">
            <patternset>
                <include name="*Tests.dll" />
            </patternset>
        </fileset>
    </apply>

How can I apply the prefix /TestContainer: to the contents of <srcfile />?

MSTest delimits switch names with a semicolon, not a space, so I can't just append it as <arg value="/TestContainer">. I've also tried <srcfile prefix="/TestContainer:" /> as suggested here, but this is not supported in my version (1.7).

This is a bit of a cheat, but you might be able to adapt it to your case. The apply task has a nested element targetfile that can be used in the same way as srcfile - placed between the command arguments where needed. The value of targetfile is derived from srcfile using a mapper element. So you can attach prefixes. Something like this perhaps:

<apply executable="${mstest}" addsourcefile="false" relative="true">
    <arg value="/resultsfile:TestResults.trx" />
    <arg value="/testsettings:ReleaseCodeCoverage.testsettings" />
    <arg value="/detail:errormessage" />
    <targetfile/>
    <fileset dir="bin/${buildType}">
        <patternset>
            <include name="*Tests.dll" />
        </patternset>
    </fileset>
    <mapper type="regexp" from="(.*)" to="/TestContainer:bin/${buildType}/\1" />
</apply>

Note the use of the relative attribute, otherwise the path gets prefixed in front of the target 'filename'.