Edit this page

Adding Custom Grid Columns

Since Telerik® UI for ASP.NET AJAX Q2 2009 it is possible to add custom columns in the embedded RadGrid. There are two main steps that need to be done in order to achieve this.

  1. Implement a custom FileSystemContentProvider. The easiest way to do this is to override the FileSystemContentProvider class. We need to override the ResolveDirectory and ResolveRootDirectoryAsTree methods (Example 1 and Example 2) in order to add two additional properties in the every DirectoryItem and FileItem respectively.

  2. Build two GridTemplateColumns on the server and add them to the columns collection of the Grid (Example 3).

Example 1: Override the ResolveDirectory method

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());
        // 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 Overloads Overrides Function ResolveDirectory(ByVal path As String) As DirectoryItem
    ' Update all file items with the additional information (date, owner)
    Dim oldItem As DirectoryItem = MyBase.ResolveDirectory(path)
    For Each fileItem As FileItem In oldItem.Files
        ' Get the information from the physical file
        Dim fInfo As 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())
        ' Type targetType = typeof(System.Security.Principal.NTAccount);
        ' string value = fInfo.GetAccessControl().GetOwner(targetType).Value.Replace("\\", "\\\\");
        Dim ownerName As String = "Telerik"
        fileItem.Attributes.Add("Owner", ownerName)
    Next
    Return oldItem
End Function

Example 2: Override the Resolve RootDirectoryAsTree:

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;
}
Public Overloads Overrides Function ResolveRootDirectoryAsTree(ByVal path As String) As DirectoryItem
    ' Update all directory items with the additional information (date, owner)
    Dim oldItem As DirectoryItem = MyBase.ResolveRootDirectoryAsTree(path)
    For Each dirItem As DirectoryItem In oldItem.Directories
        ' Get the information from the physical directory
        Dim dInfo As 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("\\", "\\\\");
        Dim ownerName As String = "Telerik"
        dirItem.Attributes.Add("Owner", ownerName)
    Next
    Return oldItem
End Function

Example 3: Adding two GridTemplateColumns columns collection of the Grid.

// Add a new “”column for the date
GridTemplateColumn gridTemplateColumn1 = new GridTemplateColumn();
gridTemplateColumn1.HeaderText = "Creation Date";
gridTemplateColumn1.SortExpression = "Date";
gridTemplateColumn1.UniqueName = "Date";
gridTemplateColumn1.DataField = "Date";
RadFileExplorer1.Grid.Columns.Add(gridTemplateColumn1); // Add the first column
// Add a new “”column for the file owner
GridTemplateColumn gridTemplateColumn2 = new GridTemplateColumn();
gridTemplateColumn2.HeaderText = "Owner Name";
gridTemplateColumn2.SortExpression = "Owner";
gridTemplateColumn2.UniqueName = "Owner";
gridTemplateColumn2.DataField = "Owner";
RadFileExplorer1.Grid.Columns.Add(gridTemplateColumn2);// Add the second column 
' Add a new “Date” column for the date
Dim gridTemplateColumn1 As New GridTemplateColumn()
gridTemplateColumn1.HeaderText = "Creation Date"
gridTemplateColumn1.SortExpression = "Date"
gridTemplateColumn1.UniqueName = "Date"
gridTemplateColumn1.DataField = "Date"
' Add the first column
RadFileExplorer1.Grid.Columns.Add(gridTemplateColumn1)
' Add a new “Owner” column for the file owner
Dim gridTemplateColumn2 As New GridTemplateColumn()
gridTemplateColumn2.HeaderText = "Owner Name"
gridTemplateColumn2.SortExpression = "Owner"
gridTemplateColumn2.UniqueName = "Owner"
gridTemplateColumn2.DataField = "Owner"
' Add the second column
RadFileExplorer1.Grid.Columns.Add(gridTemplateColumn2)
important

Set the newly added properties name (“Date” and “Owner”)to the UniqueName property of the newly created column

See Also