I often find myself in the situation of looking for files matching a certain pattern within a folder or below.

Here is a typical use case

As of today, executing dotnet test on a solution will try to find and execute tests on every project filling the log with errors because no testable project was found. This is why I prefer to find every project file within the tests directory hive.

Task("Test")
    .IsDependentOn("Build")
    .Does(() => 
{
    var testProjects = FindFilesInDirectory(testDirectory, "*.csproj", SearchScope.Recursive);

    foreach (var project in testProjects)
    {
        DotNetCoreTest(project.FullPath);
    }
});

I am aware that the same functionality is offered by IFileSystem but the result of IFileSystem.GetFiles is a list of IFile instead of FilePath. This is not convenient since most of the aliases work with FilePath.