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[Solved] FilterExpression does not work after upgrade to last version of Telerik

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Grid

This is a migrated thread and some comments may be shown as answers.

Ivan Aquino asked on 13 Aug 2009, 07:17 PM

Hi all. After upgrading to the 2009 Q2 version of ASP.NET AJAX controls, the filterexpression property of radgrid does not work anymore. I mean that the initial filter(When page load) is not filtering anything. My radgrid is binded using a list of custom objects, and the filterexpression code block that I use is:

if (Assembly.GetAssembly(typeof(ScriptManager)).FullName.IndexOf("3.5") != -1)
            {
                rgMenu.MasterTableView.FilterExpression = @"it[""ParentMenuID""] == Guid.Empty";
            }
            else
            {
                rgMenu.MasterTableView.FilterExpression = "ParentMenuID== Guid.Empty";
            }

In the avobe mentioned code, ParentMenuID is a property of my custom object, and I want to filter the list of this objects, showing only the ones who have ParentMenuID == Guid.Empty.

I will really appreciate your help and response.

Thanks a lot

Ivan Aquino

3 Answers, 1 is accepted

answered on 17 Aug 2009, 06:41 PM

It does not show any error, it just show all the items of the list of custom objects(without filtering). I reproduce the error in the following code.

    
            <%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %> 
        
            <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
        
            <%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %> 
        
            <html xmlns="http://www.w3.org/1999/xhtml"> 
        
            <head runat="server"> 
        
                <title></title> 
        
            </head> 
        
            <body> 
        
                <form id="form1" runat="server"> 
        
                <asp:ScriptManager ID="smMgr" runat="server"> 
        
            </asp:ScriptManager> 
        
                <div> 
        
                     <telerik:RadGrid ID="rgMenu" runat="server" OnNeedDataSource="OnNeedDataSource" 
        
                     AutoGenerateColumns="false" EnableLinqExpressions="false"> 
        
                        <MasterTableView runat="server" AllowSorting="true" AutoGenerateColumns="false" DataKeyNames="name,lastname"> 
        
                            <Columns> 
        
                                <telerik:GridBoundColumn DataField="name" > 
        
                                </telerik:GridBoundColumn> 
        
                                 <telerik:GridBoundColumn DataField="lastname" > 
        
                                </telerik:GridBoundColumn> 
        
                            </Columns> 
        
                        </MasterTableView> 
        
                     </telerik:RadGrid> 
        
                </div> 
        
                </form> 
        
            </body> 
        
            </html>

    
            using System; 
        
            using System.Collections.Generic; 
        
            using System.Linq; 
        
            using System.Web; 
        
            using System.Web.UI; 
        
            using System.Web.UI.WebControls; 
        
            using Telerik.Web.UI; 
        
            public partial class _Default : System.Web.UI.Page  
        
            { 
        
                protected void Page_Load(object sender, EventArgs e) 
        
                { 
        
                    rgMenu.MasterTableView.FilterExpression = @"lastname == Guid.Empty "; 
        
                } 
        
                protected void OnNeedDataSource(object source, GridNeedDataSourceEventArgs e) 
        
                { 
        
                    List<Customer> list = new List<Customer>(); 
        
                    list.Add(new Customer() { name = "Ivan", lastname = Guid.NewGuid() }); 
        
                    list.Add(new Customer() { name = "Gustavo", lastname = Guid.NewGuid() }); 
        
                    list.Add(new Customer() { name = "Ernesto", lastname = Guid.NewGuid() }); 
        
                    list.Add(new Customer() { name = "Richard", lastname = Guid.Empty }); 
        
                    list.Add(new Customer() { name = "Aldo", lastname = Guid.Empty }); 
        
                    list.Add(new Customer() { name = "Rony", lastname = Guid.Empty }); 
        
                    rgMenu.DataSource = list; 
        
                } 
        
                class Customer 
        
                { 
        
                    public string name { get; set; } 
        
                    public Guid lastname { get; set; } 
        
                } 
        
            }