MSBuild merge item groups

问题

Need some help with this MSBuild code.

I want to generate 4 app.config files with different settings and create 2 setup files for QA and production.

Each setup file will have 2 physical installations (Production lines).

So QA setup should include 2 app.configs with qa settings for production line 1 and 2, the same for production setup.

Here is a extract of the msbuild I have so far.

<ItemGroup>
  <BuildEnvironment Include="QA">
    <Server>qa-server</Server>
  <BuildEnvironment/>
  <BuildEnvironment Include="Prod">
    <Server>prod-server</Server>
  <BuildEnvironment/>

  <Line Include="1">
    <Setting>A</Setting>
  </Line>
  <Line Include="2">
    <Setting>B</Setting>
  </Line>
<ItemGroup>

<Target Name="PublishSetup" Inputs="@(BuildEnvironment)" Outputs="%(BuildEnvironment.Identity)">
  <!-- Doesn't work at all -->
  <ItemGroup>
    <AppConfig Include="@(BuildEnvironment);@(Line)">
      <Path>$(MyOutDir)\App.Config-%(Identity)</Path>
    </AppConfig>
  </ItemGroup>

  <!-- Copy app.config to the four new files -->
  <Copy SourceFiles="$(AppConfigFile)" DestinationFiles="%(AppConfig.Path)" />    

  <!-- Update each new app.config with XmlUpdate (community task), something like the following -->
  <XmlUpdate XmlFileName="%(AppConfig.Path)" XPath=".." Value="%(AppConfig.Server)" />
  <XmlUpdate XmlFileName="%(AppConfig.Path)" XPath=".." Value="%(AppConfig.Setting)" />

  <!-- Build 2 setup.exe, one for qa and one prod using a Exec-task passing in qa and prod as command line argument -->
  <Exec Command="setupcompiler.exe /d%(BuildEnvironment.Identity)" />
</Target>

The 4 resulting app.configs should be like this

app.config-QA-1
<connectionstring datasource="qa-server" ../>
<applicationSetting name="aName" value="A" />

app.config-QA-2
<connectionstring datasource="qa-server" ../>
<applicationSetting name="aName" value="B" />

app.config-Prod-1
<connectionstring datasource="prod-server" ../>
<applicationSetting name="aName" value="A" />

app.config-Prod-2
<connectionstring datasource="prod-server" ../>
<applicationSetting name="aName" value="B" />

回答1:

The idea is to first build a 'cross-product', an ItemGroup containing the 4 combinations. Can be done by combining @ and % for the two groups, as shown here. Then in a second step populate the ItemGroup with extra metadata based on existing metadata (adding metadata is just declaring the group again and adding metadata). It's a bit tricky here, because from Line you both want Identity and Setting - I don't know a nice msbuild way of doing this so I resorted to building a string with Identity|Setting, then splitting on the | later on.

<Target Name="PublishSetup">
  <ItemGroup>
    <AppConfig Include="@(BuildEnvironment)">
      <Mod>%(Line.Identity)|%(Line.Setting)</Mod>
    </AppConfig>
    <AppConfig>
      <Line>$([System.String]::Copy('%(Mod)').Split('|')[0])</Line>
      <Setting>$([System.String]::Copy('%(Mod)').Split('|')[1])</Setting>
    </AppConfig>
    <AppConfig>
      <Path>app.config-%(Identity)-%(Line)</Path>
    </AppConfig>
  </ItemGroup>

  <Message Text="Path=%(AppConfig.Path) Server=%(AppConfig.Server) Setting=%(AppConfig.Setting)" />
</Target>

Output:

Path=app.config-QA-1 Server=qa-server Setting=A
Path=app.config-Prod-1 Server=prod-server Setting=A
Path=app.config-QA-2 Server=qa-server Setting=B
Path=app.config-Prod-2 Server=prod-server Setting=B

来源：https://stackoverflow.com/questions/37186867/msbuild-merge-item-groups

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msbuild