Questions on UI for ASP.NET AJAX Forum

4 answers

197 views

[Solved] Exception when handling ItemCreated in CompositeControl

I am working on a project that would benefit from adding a RadGrid to a CompositeControl. The grid works as expected until I attempt to handle the ItemCreated event which results in the following exception: Unable to cast object of type 'Telerik.Web.UI.GridItemEventHandler' to type 'Telerik.Web.UI.GridItemEventHandler'.

I have submitted a Telerik support ticket requesting assistance with this exception and to see if there is a different way of doing what I need. Unfortunatly after several exchanges with support I have found myself stuck in a "it works for me" loop.

Is there anyone in the community who can see an issue with the way I have coded this CompositeControl or is there a better/different way to create a CompositeControl containing a RadGrid that handles events that I can test?

Thank you!

CustomControls.dll (The CompositeControl with RadGrid)

    
            using System.ComponentModel; 
        
            using System.Web.UI; 
        
            using System.Web.UI.WebControls; 
        
            using Telerik.Web.UI; 
        
            namespace Company.CustomControls 
        
            { 
        
                [ToolboxData("<{0}:CustomGrid runat=server></{0}:CustomGrid>")] 
        
                public class CustomGrid : CompositeControl, INamingContainer 
        
                { 
        
                    private RadGrid _MainGridView; 
        
                    public CustomGrid() { 
        
                        _MainGridView = new RadGrid(); 
        
                    } 
        
                    public object DataSource { 
        
                        get { return _MainGridView.DataSource; } 
        
                        set { _MainGridView.DataSource = value; } 
        
                    } 
        
                    protected override void CreateChildControls() { 
        
                        Controls.Add(new LiteralControl("Custom Grid:<br />")); 
        
                        _MainGridView.AutoGenerateColumns = true; 
        
                        Controls.Add(_MainGridView); 
        
                    } 
        
                    public event GridItemEventHandler ItemCreated { 
        
                        add { _MainGridView.ItemCreated += value; } 
        
                        remove { _MainGridView.ItemCreated -= value; } 
        
                    } 
        
                } 
        
            }

Default.aspx

    
            <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> 
        
            <%@ Register assembly="CustomControls" namespace="Company.CustomControls" tagprefix="cc1" %> 
        
            <!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>CustomGrid Test</title></head> 
        
            <body> 
        
                <form id="form1" runat="server"> 
        
                <div> 
        
                    <asp:ScriptManager ID="ScriptManager1" runat="server"> 
        
                    </asp:ScriptManager> 
        
                    <cc1:CustomGrid runat="server" ID="mainCustomGrid" onitemcreated="mainCustomGrid_ItemCreated"></cc1:CustomGrid> 
        
                </div> 
        
                </form> 
        
            </body> 
        
            </html>

Default.aspx.cs

    
            using System; 
        
            using System.Collections.Generic; 
        
            public partial class _Default : System.Web.UI.Page 
        
            { 
        
                protected void Page_Load(object sender, EventArgs e) 
        
                { 
        
                    List<TestData> GridData = new List<TestData>(); 
        
                    for (int i = 1000; i < 1025; i++) 
        
                        GridData.Add(new TestData { Name = "Name " + i.ToString(), Phone = "555-555-" + i.ToString() }); 
        
                    mainCustomGrid.DataSource = GridData; 
        
                } 
        
                protected void mainCustomGrid_ItemCreated(object sender, Telerik.Web.UI.GridItemEventArgs e) { 
        
                    // Do work here... 
        
                } 
        
            } 
        
            public class TestData 
        
            { 
        
                public string Name { get; set; } 
        
                public string Phone { get; set; } 
        
            }

Exception
[InvalidCastException: Unable to cast object of type 'Telerik.Web.UI.GridItemEventHandler' to type 'Telerik.Web.UI.GridItemEventHandler'.]
   Telerik.Web.UI.RadGrid.OnItemCreated(GridItemEventArgs e) +110
   Telerik.Web.UI.RadGrid.CallOnItemCreated(GridItemEventArgs e) +39
   Telerik.Web.UI.GridItem.SetupItem(Boolean dataBind, Object dataItem, GridColumn[] columns, ControlCollection rows) +986
   Telerik.Web.UI.GridTableView.CreateHeaderItem(Boolean useDataSource, GridColumn[] copiedColumnSet, GridTHead thead) +126
   Telerik.Web.UI.GridTableView.CreateControlHierarchy(Boolean useDataSource) +980
   Telerik.Web.UI.GridTableView.CreateChildControls(IEnumerable dataSource, Boolean useDataSource) +802
   System.Web.UI.WebControls.CompositeDataBoundControl.PerformDataBinding(IEnumerable data) +57
   System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable data) +114
   System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) +31
   System.Web.UI.WebControls.DataBoundControl.PerformSelect() +142
   Telerik.Web.UI.GridTableView.PerformSelect() +28
   System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +73
   Telerik.Web.UI.GridTableView.DataBind() +368
   Telerik.Web.UI.RadGrid.DataBind() +165
   Telerik.Web.UI.RadGrid.AutoDataBind(GridRebindReason rebindReason) +3855
   Telerik.Web.UI.RadGrid.OnLoad(EventArgs e) +177
   System.Web.UI.Control.LoadRecursive() +50
   System.Web.UI.Control.AddedControl(Control control, Int32 index) +265
   System.Web.UI.ControlCollection.Add(Control child) +80
   Company.CustomControls.CustomGrid.CreateChildControls() in C:\Data\CompositeControlGrid\TelerikTesting\CustomControls\CustomGrid.cs:28
   System.Web.UI.Control.EnsureChildControls() +87
   System.Web.UI.Control.PreRenderRecursiveInternal() +44
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +84

Grid

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I just installed the new "aspnet video" controls and realised that all my telerik controls diasappeared from the toolbox. Is it a bug? How can I get the controls back in my tool box?

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I have 4 pages in my website and iam uploading a file using rad controls in 2nd page and im redirected to 3rd page....if i want to go back to 2nd page again using "back screen" then iam getting "Webpage expired" message... and if i refresh the 2nd page again, then im getting the values... What could be the reason?

any idea?????

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I want to know how and where the MOSS RAD Editor content will be stored?Will RAD Editor maintain any own database or will it be stored in MOSS content database ? Will it maintain versions?

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i need some help.
I am using the RadEditor for SharePoint in a WCM Cenario, the Version is 4.3.1.0.

I need to add some special Company-Specific-colors into the color picker (The small window you can change the background or font color).

Can anybody help me?

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I am trying to use the RadEditor as an in-place editor for sections of a HTML page by using several radeditor controls on the same page. One control for each editable part of the page.

The problem I have is that whenever the editor controls are 'enabled', a 1px black border is showing around the text.

How can I get rid of this border? I haven't been able to identify which CSS class for the control is creating this border.

My code is exactly like your demo for 'using RadEditor as a textbox' (http://demos.telerik.com/aspnet-ajax/Editor/Examples/EditorAsTextBox/DefaultCS.aspx), except that I don't want a border on the text box.

I hope somebody can help. Thanks in advance.

Editor

answered on 16 Jan 2009

	using System.ComponentModel;
	using System.Web.UI;
	using System.Web.UI.WebControls;
	using Telerik.Web.UI;

	namespace Company.CustomControls
	{
	[ToolboxData("<{0}:CustomGrid runat=server></{0}:CustomGrid>")]
	public class CustomGrid : CompositeControl, INamingContainer
	{
	private RadGrid _MainGridView;

	public CustomGrid() {
	_MainGridView = new RadGrid();
	}

	public object DataSource {
	get { return _MainGridView.DataSource; }
	set { _MainGridView.DataSource = value; }
	}

	protected override void CreateChildControls() {
	Controls.Add(new LiteralControl("Custom Grid:<br />"));
	_MainGridView.AutoGenerateColumns = true;
	Controls.Add(_MainGridView);
	}

	public event GridItemEventHandler ItemCreated {
	add { _MainGridView.ItemCreated += value; }
	remove { _MainGridView.ItemCreated -= value; }
	}
	}
	}

	<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
	<%@ Register assembly="CustomControls" namespace="Company.CustomControls" tagprefix="cc1" %>
	<!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>CustomGrid Test</title></head>
	<body>
	<form id="form1" runat="server">
	<div>
	<asp:ScriptManager ID="ScriptManager1" runat="server">
	</asp:ScriptManager>
	<cc1:CustomGrid runat="server" ID="mainCustomGrid" onitemcreated="mainCustomGrid_ItemCreated"></cc1:CustomGrid>
	</div>
	</form>
	</body>
	</html>

	using System;
	using System.Collections.Generic;

	public partial class _Default : System.Web.UI.Page
	{
	protected void Page_Load(object sender, EventArgs e)
	{
	List<TestData> GridData = new List<TestData>();
	for (int i = 1000; i < 1025; i++)
	GridData.Add(new TestData { Name = "Name " + i.ToString(), Phone = "555-555-" + i.ToString() });
	mainCustomGrid.DataSource = GridData;
	}

	protected void mainCustomGrid_ItemCreated(object sender, Telerik.Web.UI.GridItemEventArgs e) {
	// Do work here...
	}
	}

	public class TestData
	{
	public string Name { get; set; }
	public string Phone { get; set; }
	}