MSBuild属性范围

Question

我再次与MSBuild作战.我希望使用根路径定义属性值.作为构建的一部分,路径将使用版本信息进行更新.但是,MSBuild似乎有自己的范围规则似乎完全倒退.拿第一个例子:

<?xml version="1.0" encoding="utf-8"?>
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="3.5">

  <PropertyGroup>
    <MyPath>\\server\folder</MyPath>
  </PropertyGroup>

  <Target Name="Main">
    <Message Text="In Main Before - MyPath = $(MyPath)"/>
    <CallTarget Targets="Task1" />
    <CallTarget Targets="Task2" />
    <CallTarget Targets="Task3" />
    <Message Text="In Main After - MyPath = $(MyPath)"/>
  </Target>

  <Target Name="Task1">
    <PropertyGroup>
        <MyPath>$(MyPath)\version5</MyPath>
    </PropertyGroup>
    <Message Text="In Task1 - MyPath = $(MyPath)"/>
  </Target>

  <Target Name="Task2">
    <Message Text="In Task2 - MyPath = $(MyPath)"/>
  </Target>

  <Target Name="Task3">
    <Message Text="In Task3 - MyPath = $(MyPath)"/>
  </Target>

</Project>

这是使用此命令行的输出: msbuild PropertyScopeTest1.proj /target:Main

Project "C:\Temp\PropertyScopeTest1.proj" on node 1 (Main target(s)).
Main:
  In Main Before - MyPath = \\server\folder
Task1:
  In Task1 - MyPath = \\server\folder\version5
Task2:
  In Task2 - MyPath = \\server\folder\version5
Task3:
  In Task3 - MyPath = \\server\folder\version5
Main:
  In Main After - MyPath = \\server\folder
Done Building Project "C:\Temp\PropertyScopeTest1.proj" (Main target(s)).

现在,这是一个稍微不同的版本,在Main目标中设置MyPath变量:

<?xml version="1.0" encoding="utf-8"?>
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="3.5">

  <PropertyGroup>
    <MyPath>\\server\path</MyPath>
  </PropertyGroup>

  <Target Name="Main">
    <Message Text="In Main Before - MyPath = $(MyPath)"/>
    <PropertyGroup>
        <MyPath>$(MyPath)\version5</MyPath>
    </PropertyGroup>
    <Message Text="In Main After PropertyGroup - MyPath = $(MyPath)"/>
    <CallTarget Targets="Task1" />
    <CallTarget Targets="Task2" />
    <CallTarget Targets="Task3" />
    <Message Text="In Main After - MyPath = $(MyPath)"/>
  </Target>

  <Target Name="Task1">
    <Message Text="In Task1 - MyPath = $(MyPath)"/>
  </Target>

  <Target Name="Task2">
    <Message Text="In Task2 - MyPath = $(MyPath)"/>
  </Target>

  <Target Name="Task3">
    <Message Text="In Task3 - MyPath = $(MyPath)"/>
  </Target>

</Project>

这是使用此命令行的输出: msbuild PropertyScopeTest2.proj /target:Main

Project "C:\Temp\PropertyScopeTest2.proj" on node 1 (Main target(s)).
Main:
  In Main Before - MyPath = \\server\path
  In Main After PropertyGroup - MyPath = \\server\path\version5
Task1:
  In Task1 - MyPath = \\server\path
Task2:
  In Task2 - MyPath = \\server\path
Task3:
  In Task3 - MyPath = \\server\path
Main:
  In Main After - MyPath = \\server\path\version5
Done Building Project "C:\Temp\PropertyScopeTest2.proj" (Main target(s)).

我已经查看了这个网站上类似的其他链接,但似乎都在MSBuild项目文件中调用MSBuild任务.我想要做的就是更新路径并让它在项目的任何地方都可用.有任何想法吗？

Answer 1

基于sll的答案,使设置新路径而不是使用的目标CallTarget将产生预期的行为:

<?xml version="1.0" encoding="utf-8"?>
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="3.5">

  <PropertyGroup>
    <MyPath>\\server\folder</MyPath>
  </PropertyGroup>

  <Target Name="Main" DependsOnTargets="SetMyPathProperty">
    <Message Text="In Main Before - MyPath = $(MyPath)"/>
    <CallTarget Targets="Task1" />
    <Message Text="In Main After - MyPath = $(MyPath)"/>
  </Target>

  <Target Name="SetMyPathProperty">
    <PropertyGroup>
      <MyPath>$(MyPath)\version5</MyPath>
    </PropertyGroup>
  </Target>

  <Target Name="Task1">
    <Message Text="In Task1 - MyPath = $(MyPath)"/>
  </Target>

</Project>

构建输出:

Main:
  In Main Before - MyPath = \\server\folder\version5
Task1:
  In Task1 - MyPath = \\server\folder\version5
Main:
  In Main After - MyPath = \\server\folder\version5

使SetMyPathProperty成为Task1而不是Main的依赖项将导致与PropertyScopeTest1.proj相同的行为.

Answer 2

这是一个非常有趣的问题,深入研究以下文章中的示例:MSBuild脚本中的属性和项目的范围

基本上有一些技巧,在目标执行中有本地和全局上下文切换:

• 为脚本创建了一个Project类实例,并包含全局上下文中属性和项的所有值.
• 执行目标时,全局上下文将复制到目标将使用的本地上下文中.
• 作为目标执行端,本地上下文更新将合并回全局上下文.
• 在目标执行完成之前,使用CallTarget或MSBuild任务调用的目标无法访问本地更新