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[Solved] Problems with binding a Hierarchal RadGrid

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Grid

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Nkululeko Mthethwa asked on 05 Jan 2010, 12:18 PM

Hi,
I am using a Hierarchal RadGrid to display the list of classrooms in a school and a list of student in each classroom
but when I try to expand a classroom to show the students, my grid still show me the list of classrooms under a classroom instead of showing the lsit of students. I bind my grid to business objects, what am I doing wrong?
below is my code;
aspx:

    
            <%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %> 
        
            <%@ Register assembly="Telerik.Web.UI" namespace="Telerik.Web.UI" tagprefix="telerik" %> 
        
            <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
        
            <html xmlns="http://www.w3.org/1999/xhtml"> 
        
            <head runat="server"> 
        
                <title>Untitled Page</title> 
        
            </head> 
        
            <body> 
        
                <form id="form1" runat="server"> 
        
                <div> 
        
                    <asp:ScriptManager ID="ScriptManager1" runat="server"> 
        
                    </asp:ScriptManager> 
        
                    <telerik:RadGrid ID="RadGrid1" runat="server" GridLines="None"  
        
                        onneeddatasource="RadGrid1_NeedDataSource"> 
        
            <MasterTableView> 
        
                <DetailTables> 
        
                    <telerik:GridTableView runat="server" Name="details"> 
        
                        <RowIndicatorColumn> 
        
                            <HeaderStyle Width="20px" /> 
        
                        </RowIndicatorColumn> 
        
                        <ExpandCollapseColumn> 
        
                            <HeaderStyle Width="20px" /> 
        
                        </ExpandCollapseColumn> 
        
                    </telerik:GridTableView> 
        
                </DetailTables> 
        
            <RowIndicatorColumn> 
        
            <HeaderStyle Width="20px"></HeaderStyle> 
        
            </RowIndicatorColumn> 
        
            <ExpandCollapseColumn visible="True"> 
        
            <HeaderStyle Width="20px"></HeaderStyle> 
        
            </ExpandCollapseColumn> 
        
            </MasterTableView> 
        
            <FilterMenu EnableTheming="True"> 
        
            <CollapseAnimation Type="OutQuint" Duration="200"></CollapseAnimation> 
        
            </FilterMenu> 
        
                    </telerik:RadGrid> 
        
                </div> 
        
                </form> 
        
            </body> 
        
            </html>

    
            using System; 
        
            using System.Configuration; 
        
            using System.Data; 
        
            using System.Linq; 
        
            using System.Web; 
        
            using System.Web.Security; 
        
            using System.Web.UI; 
        
            using System.Web.UI.HtmlControls; 
        
            using System.Web.UI.WebControls; 
        
            using System.Web.UI.WebControls.WebParts; 
        
            using System.Xml.Linq; 
        
            using Telerik.Web.UI; 
        
            public partial class _Default : System.Web.UI.Page  
        
            { 
        
                protected void Page_Load(object sender, EventArgs e) 
        
                {    
        
                    if (!Page.IsPostBack) 
        
                    { 
        
                        RadGrid1.DetailTableDataBind += new Telerik.Web.UI.GridDetailTableDataBindEventHandler(RadGrid1_DetailTableDataBind); 
        
                    } 
        
                } 
        
                protected override void OnInit(EventArgs e) 
        
                { 
        
                    base.OnInit(e); 
        
                    if (!Page.IsPostBack) 
        
                    { 
        
                        RadGrid1.DetailTableDataBind += new Telerik.Web.UI.GridDetailTableDataBindEventHandler(RadGrid1_DetailTableDataBind); 
        
                    } 
        
                } 
        
                void RadGrid1_DetailTableDataBind(object source, Telerik.Web.UI.GridDetailTableDataBindEventArgs e) 
        
                { 
        
                    (source as RadGrid).DataSource = (e.DetailTableView.ParentItem.DataItem as ClassRoom).students; 
        
                } 
        
                public School MySchool 
        
                { 
        
                    get 
        
                    { 
        
                        if (Session["school"] == null) 
        
                            Session["school"] = new School(); 
        
                        return Session["school"] as School; 
        
                    } 
        
                } 
        
                protected void RadGrid1_NeedDataSource(object source, Telerik.Web.UI.GridNeedDataSourceEventArgs e) 
        
                { 
        
                    RadGrid1.DataSource = MySchool.classes; 
        
                } 
        
            }

app_code(c#)

    
            using System; 
        
            using System.Data; 
        
            using System.Configuration; 
        
            using System.Linq; 
        
            using System.Web; 
        
            using System.Web.Security; 
        
            using System.Web.UI; 
        
            using System.Web.UI.HtmlControls; 
        
            using System.Web.UI.WebControls; 
        
            using System.Web.UI.WebControls.WebParts; 
        
            using System.Xml.Linq; 
        
            using System.Collections.Generic; 
        
            /// <summary> 
        
            /// Summary description for Class1 
        
            /// </summary> 
        
            public class School 
        
            { 
        
                public List<ClassRoom> classes; 
        
                public School() 
        
                { 
        
                    classes = new List<ClassRoom>(); 
        
                    ClassRoom cr1 = new ClassRoom("Grade1"); 
        
                    cr1.students.Add(new Student("Nifty", "Morafo")); 
        
                    cr1.students.Add(new Student("Nathi", "Xulu")); 
        
                    cr1.students.Add(new Student("Nkululeko", "Nkuruza")); 
        
                    classes.Add(cr1); 
        
                    ClassRoom cr2 = new ClassRoom("Gravy"); 
        
                    cr2.students.Add(new Student("Jerry", "Skosana")); 
        
                    cr2.students.Add(new Student("Brian", "Baloyi")); 
        
                    classes.Add(cr2); 
        
                    ClassRoom cr3 = new ClassRoom("SuperGrade"); 
        
                    cr3.students.Add(new Student("Anele", "Ndlela")); 
        
                    cr3.students.Add(new Student("Sindi", "")); 
        
                    classes.Add(cr3); 
        
                    ClassRoom cr4 = new ClassRoom("Casanova"); 
        
                    cr4.students.Add(new Student("Good", "Night")); 
        
                    classes.Add(cr4); 
        
                } 
        
            } 
        
            public class ClassRoom 
        
            { 
        
                public ClassRoom(string gradeName) 
        
                { 
        
                    students = new List<Student>(); 
        
                    GradeName = gradeName; 
        
                } 
        
                public List<Student> students; 
        
                public string GradeName; 
        
                public string Grade 
        
                { 
        
                    get 
        
                    { 
        
                        return GradeName; 
        
                    } 
        
                } 
        
            } 
        
            public class Student 
        
            { 
        
                public Student(string name, string surname) 
        
                { 
        
                    this.Name = name; 
        
                    this.Surname = surname; 
        
                } 
        
                public string FirstName 
        
                { 
        
                    get { return Name; } 
        
                } 
        
                public string LastName 
        
                { 
        
                    get { return Surname; } 
        
                } 
        
                public string Name; 
        
                public string Surname; 
        
            }

Thanks in advance,

Nkululeko Mthethwa.

3 Answers, 1 is accepted

answered on 05 Jan 2010, 02:23 PM

Hello Nkululeko,

Try to change your code as shown bellow and let me know about the result:
C#:

protected void RadGrid1_NeedDataSource(object source, Telerik.Web.UI.GridNeedDataSourceEventArgs e)

{

if (!e.IsFromDetailTable)

{

RadGrid1.DataSource = MySchool.classes;

}

Additionally, I recommend you examine this online example, which elaborates on this subject:
http://demos.telerik.com/aspnet-ajax/grid/examples/programming/detailtabledatabind/defaultcs.aspx

I hope this helps.

Regards,
Pavlina
the Telerik team

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