ItemGroup With Custom Metadata regarding files

问题

I’m trying to create a “Files” task item group with a metadata attribute called “TargetPath” populated with the relative path to a file.

Example:
For these paths:

D:\Test\Blah.exe
D:\Test\Config\fun.config
D:\Test\en-US\my.resources.dll

The output should be:

File Target = Blah.exe
File Target = Config\fun.config
File Target = en-US\my.resources.dll

Here is my best attempt... hopefully this makes my question clearer:

<ItemGroup>
     <Files Include="d:\test\**\*" >
        <TargetPath>%(RecursiveDir)%(Filename)%(Extension)</TargetPath>
     </Files>
 </ItemGroup>

<Message Text="File Target = @(Files->'%(TargetPath)')"/>

I'd like "TargetPath" populated correctly... currently it appears to be null or empty. Anyone know what I'm missing?

Edit:

Yes, I realize I can do this:

<Message Text="File Target = @(Files->'%(RecursiveDir)%(Filename)%(Extension)')"/>

However, I'm building up this ItemGroup to use the ResolveManifestFiles MSBuild task, which requires that I build up a TaskItem with the TargetPath metadata attribute to be able to customize that value.

回答1:

You're trying to assign dynamic metadata to an itemgroup before it's created. In your example there's no need to create custom metadata since this information is already part of the well-known metadata, so you can just do:

<ItemGroup>
   <Files Include="d:\test\**\*" ></Files>
</ItemGroup>

<Message Text="File Target = @(Files->'%(RecursiveDir)%(Filename)%(Extension)')"/>

Or:

<Message Text="File Target = %(Files.RecursiveDir)%(Files.Filename)%(Files.Extension)"/>

EDIT:

This example uses CreateItem task to dynamically update the itemgroup:

<ItemGroup>
    <Files Include="d:\test\**\*" ></Files>
</ItemGroup>

<CreateItem
    Include="@(Files)"
    AdditionalMetadata="TargetPath=%(RecursiveDir)%(Filename)%(Extension)">
      <Output TaskParameter="Include" ItemName="Files"/>
</CreateItem>

回答2:

Modern MSBuild doesn't require CreateTask (since .NET 3.5).

You can do it like this:

<ItemGroup>
    <Files Include="d:\test\**\*" />
    <FilesWithMetadata Include="%(Files.Identity)" >
        <TargetPath>%(RecursiveDir)%(Filename)%(Extension)</TargetPath>
    </FilesWithMetadata>
</ItemGroup>

回答3:

I am liking the CreateItem method to use like this:

  <ItemGroup>
    <Reference Include="Newtonsoft.Json, Version=8.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
      <HintPath>..\packages\Newtonsoft.Json.8.0.2\lib\net45\Newtonsoft.Json.dll</HintPath>
       <Private>True</Private>
    </Reference>
    ...
  </ItemGroup>

  <CreateItem Include="@(Reference)" Condition="'%(Reference.Private)' == 'True'" AdditionalMetadata="TargetPath=$([System.IO.Path]::GetFileName(%(Reference.HintPath)))">
    <Output TaskParameter="Include" ItemName="DLLFiles"/>
  </CreateItem>

  <Message Text="HintPaths:  &quot;@(DLLFiles->'$(OutputPath)%(TargetPath)')&quot;" Importance="high" />

I am using Transforms to just get only the file name.

Output:

HintPaths: "bin\Release\log4net.dll;bin\Release\Newtonsoft.Json.dll;bin\Release\RabbitMQ.Client.dll;bin\Release\ReflectSoftware.Insight.dll"

来源：https://stackoverflow.com/questions/2010655/itemgroup-with-custom-metadata-regarding-files

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msbuild