C#: Iterate text files only once

Author: tamasvajk

csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/DependencyManager.cs

@@ -65,7 +65,7 @@ public DependencyManager(string srcDir, ILogger logger)
             var allFiles = GetAllFiles().ToList();
             var binaryFileExtensions = new HashSet<string>(new[] { ".dll", ".exe" }); // TODO: add more binary file extensions.
             var allNonBinaryFiles = allFiles.Where(f => !binaryFileExtensions.Contains(f.Extension.ToLowerInvariant())).ToList();
-            var smallNonBinaryFiles = allNonBinaryFiles.SelectSmallFiles(logger).SelectFileNames();
+            var smallNonBinaryFiles = allNonBinaryFiles.SelectSmallFiles(logger).SelectFileNames().ToList();
             this.fileContent = new FileContent(logger, smallNonBinaryFiles);
             this.nonGeneratedSources = allNonBinaryFiles.SelectFileNamesByExtension(".cs").ToList();
             this.generatedSources = new();