how to view all directories of drive ina listview

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hello friends,

i have a treeview control in which i am list all drive.....on selecting a drive i have to show all of its directories and files in a listview.....i am using following code..

C#

private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
       {
           //string[] omit = { ".doc", ".mp3", ".cs" };
           TreeNode newSelected = e.Node;
           listView1.Items.Clear();
           DirectoryInfo nodeDirInfo = (DirectoryInfo)newSelected.Tag;
           ListViewItem.ListViewSubItem[] subItems;
           ListViewItem item = null;

           foreach (DirectoryInfo dir in nodeDirInfo.GetDirectories())
           {
               item = new ListViewItem(dir.Name, 0);
               subItems = new ListViewItem.ListViewSubItem[]
                   {new ListViewItem.ListViewSubItem(item, "Directory"),
                    new ListViewItem.ListViewSubItem(item,
                       dir.LastAccessTime.ToShortDateString())};
               item.SubItems.AddRange(subItems);
               //      checkedListBox1.Items.Add(item);
               listView1.Items.Add(item);
           }

when it comes to DirectoryInfo nodeDirInfo=(DirectoryInfo)newSelected.Tag...line...it loads null value....
because it select C:\\ form e.node property....
how to solve this error....so it can select C:\..??

Posted 13-May-13 20:23pm

abhishekagrwl25

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Comments

toATwork 14-May-13 2:29am

Are you sure that you have assigned a DirectoryInfo object to the Tag of the "C:\" node? Otherwise the tag would not be null.

abhishekagrwl25 14-May-13 2:34am

i am using this code to populate the treeview

System.IO.DriveInfo[] drives = System.IO.DriveInfo.GetDrives();

foreach (System.IO.DriveInfo drive in drives)
{
if (drive.DriveType == System.IO.DriveType.CDRom)
{
continue;
}
else
{
TreeNode mn = new TreeNode(drive.Name);

treeView1.Nodes.Add(mn);
string str = mn.FullPath;
DirectoryInfo info1 = new DirectoryInfo(@str);
GetDirectories(info1.GetDirectories(), mn);
}
}

abhishekagrwl25 14-May-13 2:33am

e.node property returns the value "C:\\" not "C:\"...this is the exact problem...what to do so it can select "C:\" only..??

toATwork 14-May-13 2:45am

No, I do not think that this is your problem. If I see your code above, you never assign the Tag of the new node!

2 solutions

Solution 1

You should rather use System.IO.Directory.GetDirectories:
http://msdn.microsoft.com/en-us/library/c1sez4sc.aspx[^],
http://msdn.microsoft.com/en-us/library/6ff71z1w.aspx[^],
http://msdn.microsoft.com/en-us/library/ms143314.aspx[^].

Also, you should better be aware of one unpleasant Microsoft problem. Please see my past answer: Directory.Get.Files search pattern problem[^].

—SA

Posted 13-May-13 20:44pm

Sergey Alexandrovich Kryukov

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toATwork · Accepted Answer · 2013-05-13T20:48:00

Solution 2

For populating the drives, assign the DirectoryInfo to the Tag property of the new TreeNode:

C#

foreach (System.IO.DriveInfo drive in drives)
{
 if (drive.DriveType == System.IO.DriveType.CDRom)
 {
  continue;
 }
 else
 {
  TreeNode mn = new TreeNode(drive.Name);
  treeView1.Nodes.Add(mn);
  string str = mn.FullPath;
  DirectoryInfo info1 = new DirectoryInfo(@str);  // I guess the '@' has to (can) be removed
  mn.Tag = info1;  // this has to be added!
  GetDirectories(info1.GetDirectories(), mn);
 }
}

Posted 13-May-13 20:48pm

toATwork

Updated 13-May-13 20:51pm

v2

Comments

toATwork 14-May-13 3:07am

Why "just" a vote of "3" for a correct solution?

abhishekagrwl25 14-May-13 5:00am

now how to save the path of checked item of listview in a string array on button click...how to do it..??

toATwork 14-May-13 5:11am

I would rather use a list of strings. When the button is clicked, iterate recursive over all nodes. If it is checked and then add the path of the DirectoryInfo to your list.

abhishekagrwl25 14-May-13 5:19am

how to check for that item is checked...while listviewitem doesnt have item.checked property..?\

toATwork 14-May-13 5:24am

So you are looking for the selected items? Then use ListView.SelectedItems.
Or have you set the ListView.CheckBoxes property to true.
You are not providing sufficient information.

abhishekagrwl25 14-May-13 5:30am

yes i had set ListView.CheckBoxes property to true..

toATwork 14-May-13 5:33am

http://msdn.microsoft.com/en-us/library/system.windows.forms.listview.checkeditems.aspx

abhishekagrwl25 14-May-13 6:32am

but how to insert selected item's path to a list<string>.?

toATwork 14-May-13 6:36am

1. create a new list
2. iterate through the checked items
3. if the Tag of the checked item is a DirectoryInfo, cast it to DirectoryInfo, and add the FullName to the list

abhishekagrwl25 18-May-13 22:01pm

I have done this....now i have to find the selection size...how to do it..??

toATwork 21-May-13 2:28am

I am sorry, what do you mean by the selection size?

abhishekagrwl25 19-May-13 0:13am

one more question...i have listed the selected files in to an string array, if user select one file file more than once i handled it through file.exists, but if user deselect any file, now what to do for delete it from my array..??

toATwork 21-May-13 2:38am

If you have the data in a List, you can just call Remove(<item>). In a string array you must create a new array and copy all items (except the removed one) in the new array.