Azure Pipeline CmdLine@2调用OpenCover.Console报错求助

修正后的任务代码 #

- task: CmdLine@2
  displayName: Test solution
  inputs:
    script: |
      "%OPENCOVER%\opencover.console.exe" "-target:vstest.console.exe" "-targetargs:\"$(Build.BinariesDirectory)\**\*Tests.dll\"" "-output:$(Agent.BuildDirectory)\TestResults\$(Build.Repository.Name).coverage.xml" "-excludebyfile:**/Migrations/*;**moq*;**FluentAssertions*" "-excludebyattribute:*.ExcludeFromCodeCoverage;*.ExcludeFromCodeCoverageAttribute;*.ExcludeFromCoverage;*.ExcludeFromCoverageAttribute;*.GeneratedCode;*.GeneratedCodeAttribute" -register:path64 -mergebyhash -hideskipped:all

问题分析与修复说明 #

1. YAML多行字符串格式：原代码未用|标记多行字符串，YAML解析器会将整个脚本视为单行字符串，其中的转义字符（如\"）被错误解析，触发"unknown escape character"报错。添加|后，YAML会保留脚本的原始换行与转义结构，交由Cmd.exe处理。
2. 路径与变量转义：%OPENCOVER%是Cmd环境变量，无需额外转义；路径中的反斜杠\作为Cmd路径分隔符，在YAML多行字符串中保持原始写法即可。
3. 参数引号处理：-targetargs:\"...\"中的转义双引号用于确保测试dll路径作为整体参数传递给vstest.console.exe，在YAML多行字符串中该写法合法。

替代方案（单引号包裹脚本） #

也可将整个脚本用单引号包裹，避免YAML解析转义问题：

- task: CmdLine@2
  displayName: Test solution
  inputs:
    script: '"%OPENCOVER%\opencover.console.exe" "-target:vstest.console.exe" "-targetargs:\"$(Build.BinariesDirectory)\**\*Tests.dll\"" "-output:$(Agent.BuildDirectory)\TestResults\$(Build.Repository.Name).coverage.xml" "-excludebyfile:**/Migrations/*;**moq*;**FluentAssertions*" "-excludebyattribute:*.ExcludeFromCodeCoverage;*.ExcludeFromCodeCoverageAttribute;*.ExcludeFromCoverage;*.ExcludeFromCoverageAttribute;*.GeneratedCode;*.GeneratedCodeAttribute" -register:path64 -mergebyhash -hideskipped:all'

内容的提问来源于stack exchange，提问作者Lee Hongsing