SWP/List/FileSystemApi/Directory.cs

using System;
using System.Collections.Generic;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace FileSystemApi
{
    public class Directory
    {
        public static string[] GetFiles(string path, string searchString)
        {
            var fileList = new List<string>();

            IntPtr hFind = IntPtr.Zero;
            WIN32_FIND_DATA findData;

            string fullPathQuery = System.IO.Path.Combine(path, searchString);

            int ret = FileSystem.FindFirstFile(fullPathQuery, out findData, out hFind);

            if(ret == 0 || hFind == new IntPtr(-1))
            {
                return fileList.ToArray();
            }

            if( (findData.dwFileAttributes & FileAttributes.Directory) != FileAttributes.Directory )
            {
                fileList.Add(findData.cFileName);
            }
           
            while(true)
            {
                ret = FileSystem.FindNextFile(hFind, out findData);
    
                if(ret == 0)
                {
                    break;
                }

                if ((findData.dwFileAttributes & FileAttributes.Directory) != FileAttributes.Directory)
                {
                    fileList.Add(findData.cFileName);
                }
            }

            FileSystem.FindClose(hFind);
            return fileList.ToArray();
        }

        public static string[] GetDirectories(string path, string searchString)
        {
            var fileList = new List<string>();

            IntPtr hFind = IntPtr.Zero;
            WIN32_FIND_DATA findData;

            string fullPathQuery = System.IO.Path.Combine(path, searchString);

            int ret = FileSystem.FindFirstFile(fullPathQuery, out findData, out hFind);

            if (ret == 0 || hFind == new IntPtr(-1))
            {
                int err = Microsoft.Phone.InteropServices.Marshal.GetLastWin32Error();
                return fileList.ToArray();
            }

            if ((findData.dwFileAttributes & FileAttributes.Directory) == FileAttributes.Directory)
            {
                fileList.Add(findData.cFileName);
            }

            while (true)
            {
                ret = FileSystem.FindNextFile(hFind, out findData);

                if (ret == 0)
                {
                    break;
                }

                if ((findData.dwFileAttributes & FileAttributes.Directory) == FileAttributes.Directory)
                {
                    fileList.Add(findData.cFileName);
                }
            }

            FileSystem.FindClose(hFind);
            return fileList.ToArray();
        }

    }
}