ResolveRootDirectoryAsTree being called multiple times

[Chris]

I am implementing my own File Browser Content Provider and have observed "ResolveRootDirectoryAsTree" being called for the subdirectory paths as well as my intended root (the first ViewPath). Am I misunderstanding what ResolveRootDirectoryAsTree is for?

I have my FileExplorer in a UserControl and I'm initializing it during the Init event of the UserControl.

 

<rad:RadFileExplorer ID="radFileExplorer" runat="server" EnableOpenFile="false" OnClientFileOpen="ClientFileOpenHandler" Width="588"></rad:RadFileExplorer>

        Private Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Init
            Dim path = String.Format("{0}/{1}", myOwnerID, myOwnerType)

            If myOwnerType = DocumentOwnerType.Employee Then
                radFileExplorer.Upload.OnClientAdded = "AddFieldsForEEDocuments"
                radFileExplorer.WindowManager.Height = 100
            Else
                radFileExplorer.Upload.OnClientAdded = "AddFields"
                radFileExplorer.WindowManager.Height = 150
            End If
            radFileExplorer.Upload.InitialFileInputsCount = 1
            radFileExplorer.Upload.ControlObjectsVisibility = Telerik.Web.UI.ControlObjectsVisibility.None

            radFileExplorer.VisibleControls = _
             Telerik.Web.UI.FileExplorer.FileExplorerControls.ContextMenus Or _
             Telerik.Web.UI.FileExplorer.FileExplorerControls.Grid Or _
             Telerik.Web.UI.FileExplorer.FileExplorerControls.Toolbar Or _
             Telerik.Web.UI.FileExplorer.FileExplorerControls.TreeView

            radFileExplorer.Configuration.ContentProviderTypeName = GetType(DocumentStorageContentProvider).AssemblyQualifiedName

            radFileExplorer.Configuration.ViewPaths = New String() {path}

End Sub

[Lini]

Hi Chris,

We plan to update the FileExplorer online documentation next week as part of our RadControls service pack release and offer much more detailed information about the file browser content provider model.

The ResolveRootDirectoryAsTree method is called when the FileExplorer control wants to get the subfolders of a particular folder. Since the folders in the explorer tree are expanded using ajax requests, the function is called for each expanded folders. If you are concerned about the performance of your provider, you should make the function return only one level of child folders. For example if you have the following folder structure:

root_folder
   - sub_folder1
   - sub_folder2
      -sub_sub_folder1
      -sub_sub_folder2
    - sub_folder3

If you call the ResolveRootDirectoryAsTree method for the "root_folder" above, you should only return "sub_folder1","sub_folder2", and "sub_folder3" in the list of sub-folders. There is no need to go further down in the folder structure and return the subfolders of "sub_folder2". Note that you can also skip the files. Only the folders are important in the return value of this method.

The ResolveDirectory method is called for two reasons - to get the files in a particular folder and to check a folder's permissions.

To populate the file explorer's grid control, we first call ResolveRootDirectoryAsTree to get the sub-folders of the current folder and then ResolveDirectory to get the files.

Best wishes,
Lini
the Telerik team

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[Chris]

Thanks for the reply.
I wish your explanation was in the documentation a week ago! :-)