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POWhy is $([System.Text.RegularExpressions.Regex]::IsMatch()) evaluated once in ItemGroupDefinition?
 

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  1. POWhy is $([System.Text.RegularExpressions.Regex]::IsMatch()) evaluated once in ItemGroupDefinition?
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    <p>So fiddling with MSBuild tasks, and I am finding that a Regex metadata property is evaluated once rather than per item.</p> <p>For example</p> <pre><code>&lt;!-- actual items, we use standard project reference items and extend via ItemDefinitionGroup. add project references through IDE to extend coverage --&gt; &lt;ItemGroup&gt; &lt;ProjectReference Include="..\Example.UnitTests-x86\Example.UnitTests-x86.csproj"&gt; &lt;Project&gt;{7e854803-007c-4800-80f9-be908655229d}&lt;/Project&gt; &lt;Name&gt;Example.UnitTests-x86&lt;/Name&gt; &lt;/ProjectReference&gt; &lt;ProjectReference Include="..\Example.UnitTests\Example.UnitTests.csproj"&gt; &lt;Project&gt;{eaac5f22-bfb8-4df7-a711-126907831a0f}&lt;/Project&gt; &lt;Name&gt;Example.UnitTests&lt;/Name&gt; &lt;/ProjectReference&gt; &lt;/ItemGroup&gt; &lt;!-- additional item properties, defined with respect to item declaring it --&gt; &lt;ItemDefinitionGroup&gt; &lt;ProjectReference&gt; &lt;Isx86&gt; $([System.Text.RegularExpressions.Regex]::IsMatch(%(Filename), '.*x86*')) &lt;/Isx86&gt; &lt;/ProjectReference&gt; &lt;/ItemDefinitionGroup&gt; &lt;!-- additional task target, invoke both x64 and x86 tasks here --&gt; &lt;Target Name="AdditionalTasks"&gt; &lt;Message Text="%(ProjectReference.Filename) Isx86 '%(Isx86)' Inline '$([System.Text.RegularExpressions.Regex]::IsMatch(%(Filename), '.*x86*'))'" Importance="high" /&gt; &lt;/Target&gt; </code></pre> <p>Produces this output</p> <pre><code>Example.UnitTests-x86 Isx86 'False' Inline 'True' Example.UnitTests Isx86 'False' Inline 'False' </code></pre>
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