If you're an Azure DevOps user looking for both where and how to exclude files and folders, here ya go:
Example:
# Additional properties that will be passed to the scanner,
# Put one key=value per line, example:
# sonar.exclusions=**/*.bin
sonar.exclusions=MyProjectName/MyWebContentFolder/**
Note: If you're not sure on the path, you can go into sonarqube, view your project, look at all or new 'Code Smells' and the path you need is listed above each grouping of issues. You can grab the full path to a file or use wilds like these examples:
If you don't have the 'Run Code Analysis' task added, do that and place it somewhere after the 'Build solution **/*.sln' task.
Save and Queue and then check out your sonarqube server to see if the exclusions worked.