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Super Lloyd wrote:

541 projects

            string basePath = @"D:\Documents\AA Backed Up\My Projects";
            string[] projects = Directory.GetFiles(basePath, "*.csproj", SearchOption.AllDirectories);
            var solutions = projects.GroupBy(p => ExtractSolution(p, basePath))
                                    .Select(g => new { Solution = g.Key, ProjectCount = g.Count() })
                                    .OrderByDescending(a => a.ProjectCount);
            foreach (var solution in solutions)
                {
                Console.WriteLine($"{solution.Solution} : {solution.ProjectCount}");
                }
...
        string ExtractSolution(string p, string b)
            {
            string result = p.Substring(b.Length + 1);
            result = result.Substring(0, result.IndexOf('\\'));
            return result;
            }

Greg Utas wrote:

Over 30M lines of source code in all.