msbuild - How to pass ItemGroup with metadata between targets? -

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from understanding, using dependsontargets necessary pass itemgroup between targets. not sure if there other ways pass targets without dependsontargets.

i have tested itemgroup cannot pass calltarget or msbuild task. workaround solution convert itemgroup property (flatten it) , use properties pass over.

i define itemgroup of file. file has value metadata. execute target , remove 1 file item each recursive loop. here script:

<target name="mygroup">   <itemgroup>     <file include="5">       <value>5a</value>     </file>     <file include="4">       <value>4a</value>     </file>     <file include="3">       <value>3a</value>     </file>     <file include="2">       <value>2a</value>     </file>     <file include="1">       <value>1a</value>     </file>   </itemgroup> </target>  <target name="recursive" dependsontargets="mygroup" condition="$(value) > 0">   <itemgroup>     <file remove="$(value)" />   </itemgroup>    <propertygroup>     <value>$([msbuild]::subtract($(value), 1))</value>   </propertygroup>    <message text="file: @(file->'%(value)') value=$(value)" importance="high" />   <msbuild projects="$(msbuildprojectfile)" targets="recursive" properties="value=$(value)"/> </target>  <target name="build" dependsontargets="mygroup">   <msbuild projects="$(msbuildprojectfile)" targets="recursive" properties="value=5" /> </target>

the output is:

file: 4a;3a;2a;1a value=4 file: 5a;3a;2a;1a value=3 file: 5a;4a;2a;1a value=2 file: 5a;4a;3a;1a value=1 file: 5a;4a;3a;2a value=0

i expect output be:

file: 4a;3a;2a;1a value=4 file: 3a;2a;1a value=3 file: 2a;1a value=2 file: 1a value=1 file: value=0

is there solution?

not really, trying circumvent idea of msbuild build target once (unless inputs\outputs changes). , can't pass itemgroups between msbuild contexts (when call msbuild task - new context created). in script - itemgroup scoped target - need define globally it'll available other targets. can is:

  • define global property value condition use 1 passed script if exists.
  • change itemgroup mygroup target global scope.
  • define conditions on each element of itemgroup emitted depending on value of value property

e.g. script this:

<?xml version="1.0" encoding="utf-8"?> <project  xmlns="http://schemas.microsoft.com/developer/msbuild/2003">   <propertygroup>     <value condition="$(value) == ''">5</value>   </propertygroup>   <itemgroup>     <file include="5" condition="$(value) >5">       <value>5a</value>     </file>     <file include="4" condition="$(value) >4">       <value>4a</value>     </file>     <file include="3" condition="$(value) >3">       <value>3a</value>     </file>     <file include="2" condition="$(value) >2">       <value>2a</value>     </file>     <file include="1" condition="$(value) >1">       <value>1a</value>     </file>   </itemgroup>   <target name="recursive" condition="$(value) >0">     <propertygroup>       <value>$([msbuild]::subtract($(value), 1))</value>     </propertygroup>     <message text="file: @(file->'%(value)') value=$(value)" importance="high" />     <msbuild projects="$(msbuildprojectfile)" targets="recursive" properties="value=$(value)"/>   </target>   <target name="build">     <msbuild projects="$(msbuildprojectfile)" targets="recursive" properties="value=5" />   </target> </project>

as alexey shcherbak points out, can't pass itemgroup msbuild task. resolve problem introducing new property done keep list of item has processed.

<target name="mygroup">     <itemgroup>         <file include="5">             <value>5a</value>         </file>         <file include="4">             <value>4a</value>         </file>         <file include="3">             <value>3a</value>         </file>         <file include="2">             <value>2a</value>         </file>         <file include="1">             <value>1a</value>         </file>     </itemgroup> </target>  <target name="recursive" dependsontargets="mygroup" condition="$(value) > 0" >     <itemgroup>         <file remove="$(value)" />         <file remove="$(done)" />     </itemgroup>      <message text="file: @(file->'%(value)') value=$(value)" importance="high" />      <propertygroup>         <done>$(done);$(value)</done>         <value>$([msbuild]::subtract($(value), 1))</value>     </propertygroup>      <msbuild projects="$(msbuildprojectfile)" targets="recursive" properties="value=$(value);done=$(done)" /> </target>  <target name="build" dependsontargets="mygroup">     <msbuild projects="$(msbuildprojectfile)" targets="recursive" properties="value=5" /> </target>

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