MSBuild：给定绝对路径，如何获取文件的相对路径？

Question

我遇到这样一种情况，我有一堆 absolute 路径，我想将它们转换为 relative paths based on MSBuild 的另一个目录。这是我到目前为止的代码：

<PropertyGroup>
    <FromPath>$(Bar)</FromPath>
</PropertyGroup>
<ItemGroup>
    <AbsolutePaths Include="@(Foo)" Exclude="@(Baz)" />
    <PathsRelativeToBar Include="@(AbsolutePaths->'???')" /> <!-- What goes here? -->
</ItemGroup>

任何帮助将不胜感激，谢谢！

编辑： 我在 this Whosebug 问题中找到了一个基于 C# 的解决方案，但我不确定如何（或如果可能）将其转换为MSBuild.

Answer 1

MSBuild 中有一个名为 "MakeRelative"

的本机函数

这里是你如何使用它。

<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="Build" ToolsVersion="4.5" >
    <PropertyGroup>
        <Bar>c:\temp\msbuild-sample</Bar>
        <FromPath>$(Bar)</FromPath>
    </PropertyGroup>
    <ItemGroup>
        <AbsolutePaths Include="c:\temp\msbuild-sample\**\*.txt" />
    </ItemGroup>
    <Target Name="Build">
        <ItemGroup>
            <PathsRelativeToBar Include="@(AbsolutePaths)">
                <!-- Here is the magic... we're adding a piece of metadata with the relative path -->
                <RelativePath>$([MSBuild]::MakeRelative($(FromPath), %(AbsolutePaths.FullPath)))</RelativePath>
            </PathsRelativeToBar>
        </ItemGroup>
        <Message Text="----- Absolute paths -----" />
        <Message Text="%(AbsolutePaths.FullPath)" />
        <Message Text="----- Relative paths (showing full path) -----" />
        <Message Text="%(PathsRelativeToBar.FullPath)" />
        <Message Text="----- Relative paths (relative to $(FromPath)) -----" />
        <Message Text="%(PathsRelativeToBar.RelativePath)" />
    </Target>
</Project>

这是我当前环境的快速视图

C:\temp\msbuild-sample>dir /s /b

C:\temp\msbuild-sample
C:\temp\msbuild-sample\sample.build
C:\temp\msbuild-sample.1
C:\temp\msbuild-sample.txt
C:\temp\msbuild-sample.txt
C:\temp\msbuild-sample.1.txt
C:\temp\msbuild-sample.1.txt

这是输出。

----- Absolute paths -----
c:\temp\msbuild-sample.1.txt
c:\temp\msbuild-sample.1.txt
c:\temp\msbuild-sample.txt
c:\temp\msbuild-sample.txt
----- Relative paths (showing full path) -----
c:\temp\msbuild-sample.1.txt
c:\temp\msbuild-sample.1.txt
c:\temp\msbuild-sample.txt
c:\temp\msbuild-sample.txt
----- Relative paths (relative to c:\temp\msbuild-sample) -----
...1.txt
...1.txt
...txt
...txt

希望这对您有所帮助:)

MSBuild：给定绝对路径，如何获取文件的相对路径？

MSBuild: How to get the relative path to a file, given an absolute one?

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