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Purpose of FileItem.Extension

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FileExplorer
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Michael
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Michael asked on 26 Jul 2010, 04:17 PM
Hi guys!
What is the purpose of FileItem.Extension property?
I'd like to show files without extensions with proper icons. So my original thought was to use FileItem.Extension but after debugging I have discovered that only file extension is used as additional class name.
Is this an issue that Extension property is ignored and how can I show files with proper icons?

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Petio Petkov
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answered on 29 Jul 2010, 02:31 PM
Hello Michael,

My suggestion is to add custom columns as in the "Add Custom Columns" example - all you need to do is to add a column with filename(without file extension) and hide the original fileName column. The code below illustrates how to show files without  their extensions:.
Codebehind:
    public partial class DefaultCS : System.Web.UI.Page
    {
  
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                //be sure to set content provider first before doing anything involving paths (e.g. set InitialPath)
                RadFileExplorer1.Configuration.ContentProviderTypeName = typeof(CustomColumnsContentProvider).AssemblyQualifiedName;
                RadFileExplorer1.InitialPath = Page.ResolveUrl("~/FileExplorer/Examples/Default/Images/Northwind/Customers/");
            }
            AddDateAndOwnerColumns();
        }
  
        private void AddGridColumn(string name, string uniqueName, bool sortable)
        {
              
            // Add a new column with the specified name
            GridTemplateColumn gridTemplateColumn1 = new GridTemplateColumn();
            gridTemplateColumn1.HeaderText = name;
            if (sortable)
                gridTemplateColumn1.SortExpression = uniqueName;
            gridTemplateColumn1.UniqueName = uniqueName;
            gridTemplateColumn1.DataField = uniqueName;
  
            RadFileExplorer1.Grid.Columns.Add(gridTemplateColumn1);
        }
  
        private void AddDateAndOwnerColumns()
        {   
                AddGridColumn("Creation Date", "Date", true);
                AddGridColumn("Owner Name", "Owner", false);
                AddGridColumn("FileWithoutExt", "FileWithoutExt", false);
        }
  
        protected void RadFileExplorer1_ExplorerPopulated(object sender, RadFileExplorerPopulatedEventArgs e)
        {
            //implement sorting for the custom Date column
            string sortingColumn = e.SortColumnName;
            if (sortingColumn == "Date")
            {
                DateComparer dc = new DateComparer();
                e.List.Sort(dc);
                if (e.SortDirection.IndexOf("DESC") != -1)
                {
                    //reverse order
                    e.List.Reverse();
                }
            }
        }
        public class DateComparer : IComparer<FileBrowserItem>
        {
            int IComparer<FileBrowserItem>.Compare(FileBrowserItem item1, FileBrowserItem item2)
            {
                //treat folders separate from files
                DateTime date1 = DateTime.Parse(item1.Attributes["Date"]);
                DateTime date2 = DateTime.Parse(item2.Attributes["Date"]);
                if (item1 is DirectoryItem)
                {
                    if (item2 is DirectoryItem)
                    {
                        return DateTime.Compare(date1, date2);
                    }
                    else
                    {
                        return -1;
                    }
                }
                else
                {
                    if (item2 is DirectoryItem)
                    {
                        return 1;
                    }
                    else
                    {
                        return DateTime.Compare(date1, date2);
                    }
                }
            }
        }
  
        public class CustomColumnsContentProvider : FileSystemContentProvider
        {
            public CustomColumnsContentProvider(HttpContext context, string[] searchPatterns, string[] viewPaths, string[] uploadPaths, string[] deletePaths, string selectedUrl, string selectedItemTag)
                : base(context, searchPatterns, viewPaths, uploadPaths, deletePaths, selectedUrl, selectedItemTag)
            {
                // Declaring a constructor is required when creating a custom content provider class
            }
  
            public override DirectoryItem ResolveDirectory(string path)
            {
                // Update all file items with the additional information (date, owner)
                DirectoryItem oldItem = base.ResolveDirectory(path);
  
                foreach (FileItem fileItem in oldItem.Files)
                {
                    // Get the information from the physical file
                    FileInfo fInfo = new FileInfo(Context.Server.MapPath(VirtualPathUtility.AppendTrailingSlash(oldItem.Path) + fileItem.Name));
  
                    // Add the information to the attributes collection of the item. It will be automatically picked up by the FileExplorer
                    // If the name attribute matches the unique name of a grid column
                      
                    fileItem.Attributes.Add("Date", fInfo.CreationTime.ToString());
                    fileItem.Attributes.Add("FileWithoutExt", fInfo.Name.Remove(fInfo.Name.LastIndexOf(fInfo.Extension)) );
                    // Type targetType = typeof(System.Security.Principal.NTAccount);
                    // string value = fInfo.GetAccessControl().GetOwner(targetType).Value.Replace("\\", "\\\\");
                    string ownerName = "Telerik";
                    fileItem.Attributes.Add("Owner", ownerName);
                }
  
                return oldItem;
            }
  
            public override DirectoryItem ResolveRootDirectoryAsTree(string path)
            {
                // Update all directory items with the additional information (date, owner)
                DirectoryItem oldItem = base.ResolveRootDirectoryAsTree(path);
  
                foreach (DirectoryItem dirItem in oldItem.Directories)
                {
                    // Get the information from the physical directory
                    DirectoryInfo dInfo = new DirectoryInfo(Context.Server.MapPath(VirtualPathUtility.AppendTrailingSlash(dirItem.Path)));
  
                    // Add the information to the attributes collection of the item. It will be automatically picked up by the FileExplorer
                    // If the name attribute matches the unique name of a grid column
  
                    dirItem.Attributes.Add("Date", dInfo.LastWriteTime.ToString());
  
                    //Type targetType = typeof(System.Security.Principal.NTAccount);
                    //string value = dInfo.GetAccessControl().GetOwner(targetType).Value.Replace("\\", "\\\\");
                    string ownerName = "Telerik";
                    dirItem.Attributes.Add("Owner", ownerName);
                }
                return oldItem;
            }
        }
    }
}
Please note that I'm using fInfo.Extension property and everything is fine.
Hope this helps.


Best wishes,
Petio Petkov
the Telerik team
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Michael
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answered on 02 Aug 2010, 08:05 AM
Hi Petio!
Ok, thank you. I'll try this approach.
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grant
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answered on 18 Aug 2010, 06:45 AM
Hi Petio

it's a great direction you provide.
however, Could you tell me how to add image icon before the name?

thank you very much!
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grant
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answered on 18 Aug 2010, 06:48 AM
hi Michael

have you solve your problem?
the problem is to show files without extensions with proper icons.
if yes, could you tell me how?
i have the same problem. it really freak me out.

thank you very much! 
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Michael
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answered on 18 Aug 2010, 08:56 AM
Hi grant!
I was scared by the number of lines of code proposed by Petio, so decided to show files with extensions.
If file name includes extension- everything works fine and I can see proper icons.
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Fiko
Telerik team
answered on 20 Aug 2010, 03:34 PM
Hello Guys,

In case that you need to override the icon for the unknown files (used when a file does not have any extension, for example) then you need to change the sprite fileextensionsprites.png. (icon number 22). More details how to do that can be found in this forum thread.


Kind regards,
Fiko
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Petio Petkov
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Michael
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grant
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Fiko
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