如何使用MSBuild和XSLT实现条件XAML编译？

问题描述 投票：0回答：1

按照这个问题，我想根据预处理器指令在构建时有条件地包含/排除 XAML 元素，类似于 #if/#else

 在 C# 中的工作方式。我尝试过使用 XSLT 来转换 XAML，但它没有按预期工作。

我想要实现的目标

我在我的

.csproj

中定义预处理器常量：

<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' "> <DefineConstants>DEBUG;TRACE;fix_issue_001</DefineConstants> </PropertyGroup> 
然后在 XAML 中，我想有条件地包含基于这些常量的元素：


<Window x:Class="XamlPreprocessDemo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="450" Width="800">
    <StackPanel>
        <!-- fix_issue_001:true -->
        <Button Content="Original version" Click="Button_Click" />
        <!-- end fix_issue_001:true -->
        <!-- fix_issue_001:false -->
        <Button Content="New version" Background="LightGreen" Click="Button_Click" />
        <!-- end fix_issue_001:false -->
    </StackPanel>
</Window>

我尝试的解决方案


这是我的 XSLT (Transform.xslt)：


<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" 
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    
    <xsl:param name="DefineConstants" select="''"/>
    
    <!-- Identity transform -->
    <xsl:template match="@*|node()">
        <xsl:copy>
            <xsl:apply-templates select="@*|node()"/>
        </xsl:copy>
    </xsl:template>

    <!-- Skip end markers -->
    <xsl:template match="comment()[starts-with(normalize-space(.), 'end fix_')]"/>

    <!-- Handle conditional comments -->
    <xsl:template match="comment()[starts-with(normalize-space(.), 'fix_')]">
        <xsl:variable name="content" select="normalize-space(.)"/>
        <xsl:variable name="endMarker" select="concat('end ', substring-before($content, ':'))"/>
        
        <xsl:choose>
            <!-- True condition -->
            <xsl:when test="contains($content, ':true')">
                <xsl:variable name="constant" select="substring-before($content, ':true')"/>
                <xsl:if test="contains($DefineConstants, $constant)">
                    <xsl:variable name="endComment" select="following-sibling::comment()
                        [normalize-space(.) = concat('end ', $constant, ':true')][1]"/>
                    <xsl:apply-templates select="following-sibling::node()
                        [generate-id(preceding-sibling::comment()
                            [contains(., concat($constant, ':true'))][1]) = generate-id(current())
                        and following-sibling::comment()
                            [normalize-space(.) = concat('end ', $constant, ':true')][1]
                            and generate-id(.) != generate-id($endComment)]"/>
                </xsl:if>
            </xsl:when>
            <!-- False condition -->
            <xsl:when test="contains($content, ':false')">
                <xsl:variable name="constant" select="substring-before($content, ':false')"/>
                <xsl:if test="not(contains($DefineConstants, $constant))">
                    <xsl:variable name="endComment" select="following-sibling::comment()
                        [normalize-space(.) = concat('end ', $constant, ':false')][1]"/>
                    <xsl:apply-templates select="following-sibling::node()
                        [generate-id(preceding-sibling::comment()
                            [contains(., concat($constant, ':false'))][1]) = generate-id(current())
                        and following-sibling::comment()
                            [normalize-space(.) = concat('end ', $constant, ':false')][1]
                            and generate-id(.) != generate-id($endComment)]"/>
                </xsl:if>
            </xsl:when>
        </xsl:choose>
    </xsl:template>
</xsl:stylesheet>

这是我的 MSBuild 集成 (XamlPreprocess.targets)：


<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <UsingTask TaskName="XamlPreprocessTask"
             TaskFactory="RoslynCodeTaskFactory"
             AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.Core.dll">
    <ParameterGroup>
      <InputFile ParameterType="System.String" Required="true" />
      <OutputFile ParameterType="System.String" Required="true" />
      <DefineConstants ParameterType="System.String" Required="true" />
      <TransformFile ParameterType="System.String" Required="true" />
    </ParameterGroup>
    <Task>
      <Using Namespace="System"/>
      <Using Namespace="System.IO"/>
      <Using Namespace="System.Xml"/>
      <Using Namespace="System.Xml.Xsl"/>
      <Code Type="Fragment" Language="cs">
        <![CDATA[
          try {
              var transform = new XslCompiledTransform();
              transform.Load(TransformFile);
              
              var args = new XsltArgumentList();
              args.AddParam("DefineConstants", "", DefineConstants);
              
              var outputDir = Path.GetDirectoryName(OutputFile);
              if (!Directory.Exists(outputDir))
                  Directory.CreateDirectory(outputDir);
              
              using (var writer = new XmlTextWriter(OutputFile, System.Text.Encoding.UTF8)) {
                  writer.Formatting = Formatting.Indented;
                  transform.Transform(InputFile, args, writer);
              }
              
              return true;
          }
          catch (Exception ex) {
              Log.LogError($"XAML preprocessing failed: {ex.Message}");
              return false;
          }
        ]]>
      </Code>
    </Task>
  </UsingTask>

  <PropertyGroup>
    <XamlPreprocessDir>$(IntermediateOutputPath)PreprocessedXaml\</XamlPreprocessDir>
    <XamlTransformFile>$(MSBuildThisFileDirectory)Transform.xslt</XamlTransformFile>
  </PropertyGroup>

  <Target Name="PreprocessXaml" BeforeTargets="MarkupCompilePass1;XamlMarkupCompilePass1">
    <ItemGroup>
      <XamlFiles Include="**\*.xaml" 
                Exclude="$(XamlPreprocessDir)**\*.xaml;**\.vshistory\**\*.xaml;App.xaml;bin\**\*.xaml;obj\**\*.xaml" />
    </ItemGroup>

    <MakeDir Directories="$(XamlPreprocessDir)" />

    <XamlPreprocessTask
      InputFile="%(XamlFiles.FullPath)"
      OutputFile="$(XamlPreprocessDir)%(XamlFiles.RecursiveDir)%(XamlFiles.Filename)%(XamlFiles.Extension)"
      DefineConstants="$(DefineConstants)"
      TransformFile="$(XamlTransformFile)">
    </XamlPreprocessTask>

    <!-- Copy the preprocessed files to a temporary backup -->
    <Copy SourceFiles="@(XamlFiles)" 
          DestinationFiles="@(XamlFiles->'$(XamlPreprocessDir)%(RecursiveDir)%(Filename).original%(Extension)')" />

    <!-- Copy the preprocessed files over the originals -->
    <Copy SourceFiles="@(XamlFiles->'$(XamlPreprocessDir)%(RecursiveDir)%(Filename)%(Extension)')"
          DestinationFiles="@(XamlFiles)" />
  </Target>

  <Target Name="RestoreXaml" AfterTargets="MarkupCompilePass1;XamlMarkupCompilePass1">
    <!-- Restore the original files -->
    <Copy SourceFiles="@(XamlFiles->'$(XamlPreprocessDir)%(RecursiveDir)%(Filename).original%(Extension)')"
          DestinationFiles="@(XamlFiles)" />
  </Target>

  <Target Name="CleanPreprocessedXaml" BeforeTargets="Clean">
    <RemoveDir Directories="$(XamlPreprocessDir)" />
  </Target>
</Project>

问题


XSLT 转换似乎没有效果 - 无论是否定义 
fix_issue_001
，两个按钮都会显示在最终应用程序中。我希望在定义 
fix_issue_001
 时仅看到“原始版本”按钮，未定义时仅看到“新版本”按钮。


enter image description here

要求




    必须与 Visual Studio 2019 配合使用
  • 

    • 应保留 XAML 设计器功能
  • 

    • 不应永久修改源文件
  • 

    • 与 MSBuild 流程完美集成
  • 

    • 

问题




    为什么我的 XSLT 转换不起作用？
  1. 

    2. 有没有更好的方法来实现条件XAML编译？
  2. 

    3. 
    

	


c#

xml

wpf

xaml

xslt


1个回答




    
    
    

        

            

                

                    
0
投票

                    
                

            

        

        
在 XSLT 3 中，您可以使用类似的代码


<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="3.0" 
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    exclude-result-prefixes="#all">
    
    <xsl:accumulator name="collect-to-delete" as="xs:boolean" initial-value="false()">
      <xsl:accumulator-rule match="comment()[matches(., '^\s*fix_issue_[0-9]*:false\s*$')]" select="true()"/>
      <xsl:accumulator-rule match="comment()[matches(., '^\s*end fix_issue_[0-9]*:false\s*$')]" select="false()"/>
    </xsl:accumulator>
    
    <xsl:accumulator name="delete" as="element()*" initial-value="()">
      <xsl:accumulator-rule match="*[accumulator-before('collect-to-delete')]" select="$value, ."/>
    </xsl:accumulator>
    
    <xsl:mode on-no-match="shallow-copy" use-accumulators="collect-to-delete delete"/>
    
    <xsl:template match="comment()[matches(., '^\s*fix_issue_[0-9]*:(true|false)\s*$')]"/>

    <xsl:template match="comment()[matches(., '^\s*end fix_issue_[0-9]*:(true|false)\s*$')]"/>
      
    <xsl:template match="*[accumulator-before('delete') intersect .]"/>

</xsl:stylesheet>

转变


<Window x:Class="XamlPreprocessDemo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="450" Width="800">
    <StackPanel>
        <!-- fix_issue_001:true -->
        <Button Content="Original version" Click="Button_Click" />
        <!-- end fix_issue_001:true -->
        <!-- fix_issue_001:false -->
        <Button Content="New version" Background="LightGreen" Click="Button_Click" />
        <!-- end fix_issue_001:false -->
    </StackPanel>
</Window>

进入


<?xml version="1.0" encoding="UTF-8"?><Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Class="XamlPreprocessDemo.MainWindow" Title="MainWindow" Height="450" Width="800">
    <StackPanel>
        
        <Button Content="Original version" Click="Button_Click"/>
        
        
        
        
    </StackPanel>
</Window>

例如，可以使用 .NET Framework/C# 和 Saxon HE 10 运行。而且它应该比 XSLT 1.0 更容易适应和调试。

    

	

    

    


  

  

    
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