ASP.NET 2.0 C# Generics List Collection Folder Control

 

This page demonstrates using a Generics List Collection in C# how to retrieve all folders, subfolder, and folders within subfolders.

/**//*

In this example, we are getting all folders, subfolders, and folders within

subfolders. Then we can load them into any control.

*/

 

using System;

using System.Collections.Generic;

using System.IO;

using System.Web.UI;

 

namespace StrongTypes

...{

    public class FolderExample

    ...{

        private List<string> ListFolders = new List<string>();

 

        public void PopulateFolders(string strFolderLocation, Control ctrl)

        ...{

            LoadFolders(strFolderLocation);

 

            foreach (string str in ListFolders)

            ...{

                //Add code here to add folders and subfolders to Control

            }

        }

 

        private void LoadFolders(string strFolderLocation)

        ...{

            DirectoryInfo dir = null;

 

            try

            ...{

                dir = new DirectoryInfo(strFolderLocation);

 

                FileSystemInfo[] info = dir.GetFileSystemInfos();

 

                foreach (FileSystemInfo fsi in info)

                ...{

                    if (fsi is DirectoryInfo)

                    ...{

                        ListFolders.Add(fsi.FullName);

                    }

 

                    AddDirectoriesToList(info);

                }

            }

            catch

            ...{

                if (strFolderLocation == null)

                ...{

                    throw new NullReferenceException("The property FileLocation cannot be null");

                }

 

                if (!(dir.Exists))

                ...{

                    throw new DirectoryNotFoundException("The directory you are trying to search does not exist.");

                }

            }

        }

 

        private void AddDirectoriesToList(FileSystemInfo[] info)

        ...{

            foreach (FileSystemInfo fsi in info)

            ...{

                if (fsi is DirectoryInfo)

                ...{

                    if (!(ListFolders.Contains(fsi.FullName)))

                    ...{

                        ListFolders.Add(fsi.FullName);

                    }

 

                    DirectoryInfo dir = (DirectoryInfo)fsi;

                    AddDirectoriesToList(dir.GetFileSystemInfos());

                }

            }

        }

    }

}