MSBuild 筛选条件文件的 ItemGroup [英] MSBuild Filtering ItemGroup of files with condition

问题描述

这感觉很简单，但我无法让它工作.

This feels like it's so simple, but I cannot get it to work.

我想要实现的只是一个过滤后的嵌入资源列表.我尝试了各种方法，但似乎都做对了.

All I'm trying to achieve is a filtered list of the embedded resources. I've tried various approaches but I can't seem to get it right.

以下是我认为正确的解决方案:

Here's what I thought was the right solution:

<ItemGroup>
  <AllEmbeddedResources Include="@(EmbeddedResource)" Condition="$(FullPath.Contains('Change')"/>
</ItemGroup>

编辑...澄清一下，结果是没有条件的，列表是所有嵌入的资源，有条件的，组为空.

Edit... To clarify, the results are without the condition, the list is all embedded resources, with the condition, the group is empty.

我在目标的内部和外部都尝试过这个，我尝试在一个组中获取完整列表，然后在一个单独的组中进行过滤.我知道我只是误解了 msbuild 语法的一些基本部分，我似乎无法解决.期待看到我愚蠢的错误！

I've tried this inside and outside of target's, and I've tried getting the full list in one group, and then filtering in a separate group. I know I'm just misunderstanding some fundamental part of msbuild syntax, I just can't seem to work it out. Looking forward to being shown my stupid mistake!

推荐答案

在目标内部，这可以使用项目的批处理语法和使用 System.String.Copy 方法来完成在字符串上调用实例函数:

Inside a target, this can be done using the batching syntax for items and using the System.String.Copy method to be able to call instance functions on the string:

<Target Name="ListAllEmbeddedResources">
  <ItemGroup>
    <AllEmbeddedResources Include="@(EmbeddedResource)" Condition="$([System.String]::Copy(%(FullPath)).Contains('Change'))" />
  </ItemGroup>
  <Message Importance="high" Text="AllEmbeddedResources: %(AllEmbeddedResources.Identity)" />
</Target>

请注意，此语法仅适用于目标内部，而不适用于静态评估(直接在 节点下的项目组).

Note that this syntax only works inside a target and not during static evaluation (item group directly under the <Project> node).

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