refactoring fs

Yavsc/ViewModels/UserFiles/UserDirectoryInfo.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using Yavsc.Helpers;
+
+namespace Yavsc.ViewModels.UserFiles
+{
+    public class UserDirectoryInfo
+    {
+        public string SubPath { get; private set; }
+        public UserFileInfo [] Files {
+            get; private set;
+        }
+        public string [] SubDirectories { 
+            get; private set;
+        }
+        private DirectoryInfo dInfo;
+        public UserDirectoryInfo(string username, string path)
+        {
+            SubPath = (path==null) ? username : username +  Path.DirectorySeparatorChar + path;
+            if ( !SubPath.IsValidPath() )
+                throw new InvalidOperationException(
+                    $"File name contains invalid chars, using path {SubPath}");
+            
+            dInfo = new DirectoryInfo(
+                Path.Combine(Startup.UserFilesDirName,SubPath));
+            Files = dInfo.GetFiles().Select
+             ( entry => new UserFileInfo { Name = entry.Name, Size = entry.Length, 
+             CreationTime = entry.CreationTime, LastModified = entry.LastWriteTime  }).ToArray();
+             SubDirectories = dInfo.GetDirectories().Select 
+             ( d=> d.Name ).ToArray();
+        }
+    }
+}