C ＃ "learning code snippet" - recursively obtain all files under the folder

introduction ： Record C# Recursively get under folder All the files code snippet

One 、 code snippet

       /// <summary>
        ///  Get the final required folder path string collection 
        /// </summary>
        /// <param name="folderName"></param>
        /// <returns></returns>
        private List<string> getFiles(string folderName, bool useOnlyName = false)
        {
    
            List<string> fileNameList = new List<string>() {
     };
            DirectoryInfo theFolder = new DirectoryInfo(folderName);
            DirectoryInfo[] dirInfo = theFolder.GetDirectories();

            fileNameList = getFileList(dirInfo, fileNameList, useOnlyName);
            FileInfo[] fileInfo = theFolder.GetFiles();
            for (int i = 0; i < fileInfo.Length; i++)
            {
    
                if(useOnlyName)
                {
    
                    fileNameList.Add(fileInfo[i].Name);
                }
                else
                {
    
                    fileNameList.Add(fileInfo[i].FullName);
                }                
            }
            return fileNameList;
        }

        /// <summary>
        ///  Recursively get all files in the folder （ Include files in subfolders ）
        /// </summary>
        /// <param name="dirInfos"></param>
        /// <param name="fileNameList"></param>
        /// <returns></returns>
        private List<string> getFileList(DirectoryInfo[] dirInfos, List<string> fileNameList, bool useOnlyName = false)
        {
    
            foreach (DirectoryInfo sonFolder in dirInfos)
            {
    
                FileInfo[] fileInfo = sonFolder.GetFiles();
                for (int i = 0; i < fileInfo.Length; i++)
                {
    
                    if(useOnlyName)
                    {
    
                        fileNameList.Add(fileInfo[i].Name);
                    }
                    else
                    {
    
                        fileNameList.Add(fileInfo[i].FullName);
                    }
                    
                }
                if (sonFolder.GetDirectories() != null)
                {
    
                    getFileList(sonFolder.GetDirectories(), fileNameList, useOnlyName);
                }
            }
            return fileNameList;
        }

   }

Two 、 Use cases

// Get the full path of the file 
List<string> fileWithPath = getFiles("./Documents/Help/Pages");

// Just get the file name 
List<string> fileWithPath = getFiles("./Documents/Help/Pages", true);

3、 ... and 、 test result

Get the full path ：

Get the file name