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CompositeControl and XML Deserialization on design-time problem

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User-1598340850 posted

<strike>I get "Error rendering control" error that only happens when I place the control on the webform in desgin-mode, if I run the page the control is displayed correctly.</strike>

The first sentence is not important, because this error occurs due to returned toolbars object as null.

After debugging, the problem is in a function that is called from CeateChildControls():

public static ToolBars LoadToolbarsFromConfigFile()
{

ToolBars toolbars;
Assembly executingAssembly = Assembly.GetExecutingAssembly();
string resource = "Editor.ConfigFiles.ToolBars.xml";
using (Stream stream = executingAssembly.GetManifestResourceStream(resource))
{
XmlSerializer serializer = new XmlSerializer(typeof(ToolBars));
toolbars = (serializer.Deserialize(stream)) as ToolBars;

}
return c;
}

the returned toolbars is null! (in design-mode)
But when I run the page, returned toolbars gets appropriate data.

It must be something with Assembly, because if I use file stream instead stream, with specified file, it does work.
Friday, November 27, 2009 9:43 AM

Answers

User-16411453 posted

When I design a control , I use two forms of rendering. One is runtime, and the other is design mode. I model the control in design mode, and then when perfected, I make theruntime control. You be able to adjust for CSharp code

Render the controls first to the screen. In Protected OnLoad, go ahead and serialize your data, after the controls have been rendered.

Here's a simple sample control, that makes a webpage header, OnInit is theruntime, renderdesignmode is the designmode, onrender forks the program into design or runtime mode

Don't run the code in design mode, it can't render it.

Imports System
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Text
Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls


<DefaultProperty("Text"), ToolboxData("<{0}:Display_EmbeddedHeader runat=server></{0}:Display_EmbeddedHeader>")> _
Public Class Display_EmbeddedHeader
	Inherits WebControl

	Private Panel As Panel

	Protected Overrides Sub Render(ByVal writer As HtmlTextWriter)

		If Not Me.Context Is Nothing Then
			RenderContents(writer)
		Else
			RenderDesignMode(writer)
		End If

	End Sub
	Protected Overrides Sub OnInit(ByVal e As System.EventArgs)
		MyBase.OnInit(e)

		Controls.Clear()

		Dim cs As ClientScriptManager = Me.Page.ClientScript
		Dim rsType As Type = Me.GetType()

		Dim Comment As LiteralControl
		Comment = New LiteralControl
		Comment.Text = "<!-- Internet Commerce Engine 5 Display_EmbeddedHeader Control V1.4.2 for ASP.NET -->" & vbCrLf
		Controls.Add(Comment)

		Panel = New Panel
		With Panel
			.ID = [ID] & "_EmbeddedHeader"
			.Width = 960
			.Style.Add(HtmlTextWriterStyle.Width, "960px")
			.Style.Add(HtmlTextWriterStyle.TextAlign, "center")
			.Style.Add(HtmlTextWriterStyle.Margin, "0px auto")
		End With
		Controls.Add(Panel)

		Dim table_Header As Table
		table_Header = New Table
		With table_Header
			.CellPadding = 0
			.CellSpacing = 0
			.Width = 960
			.Height = 65
			.Style.Add(HtmlTextWriterStyle.Width, "960px")
			.Style.Add(HtmlTextWriterStyle.Width, "65px")
		End With
		Panel.Controls.Add(table_Header)

		Dim tr_Header As TableRow
		tr_Header = New TableRow
		With tr_Header
		End With
		table_Header.Controls.Add(tr_Header)

		Dim td_Header As TableCell
		td_Header = New TableCell
		With td_Header
			'.CssClass = "DefaultHeader"
			.Width = [Width]
			.Height = 65
			.Style.Add(HtmlTextWriterStyle.Width, [Width].ToString)
			.Style.Add(HtmlTextWriterStyle.Height, "65px")
			.VerticalAlign = VerticalAlign.Middle
		End With
		tr_Header.Controls.Add(td_Header)

		Dim img_header As Image
		img_header = New Image
		With img_header
			.ImageAlign = ImageAlign.AbsMiddle
			.ImageUrl = cs.GetWebResourceUrl(rsType, "redCopper.ice5.admin.Header-TestDrive-Right.gif")
		End With
		td_Header.Controls.Add(img_header)


	End Sub
	Private Sub RenderDesignMode(ByVal writer As HtmlTextWriter)

		Controls.Clear()

		Dim cs As ClientScriptManager = Me.Page.ClientScript
		Dim rsType As Type = Me.GetType()

		Dim Comment As LiteralControl
		Comment = New LiteralControl
		Comment.Text = "<!-- Internet Commerce Engine 5 Display_EmbeddedHeader Control V1.4.2 for ASP.NET -->" & vbCrLf
		Controls.Add(Comment)

		Panel = New Panel
		With Panel
			.ID = [ID] & "_EmbeddedHeader"
			.Width = 960
			.Style.Add(HtmlTextWriterStyle.Width, "960px")
			.Style.Add(HtmlTextWriterStyle.TextAlign, "center")
			.Style.Add(HtmlTextWriterStyle.Margin, "0px auto")
		End With
		Controls.Add(Panel)

		Dim table_Header As Table
		table_Header = New Table
		With table_Header
			.CellPadding = 0
			.CellSpacing = 0
			.Width = 960
			.Height = 65
			.Style.Add(HtmlTextWriterStyle.Width, "960px")
			.Style.Add(HtmlTextWriterStyle.Width, "65px")
		End With
		Panel.Controls.Add(table_Header)

		Dim tr_Header As TableRow
		tr_Header = New TableRow
		With tr_Header
		End With
		table_Header.Controls.Add(tr_Header)

		Dim td_Header As TableCell
		td_Header = New TableCell
		With td_Header
			'.CssClass = "DefaultHeader"
			.Width = [Width]
			.Height = 65
			.Style.Add(HtmlTextWriterStyle.Width, [Width].ToString)
			.Style.Add(HtmlTextWriterStyle.Height, "65px")
			.VerticalAlign = VerticalAlign.Middle
		End With
		tr_Header.Controls.Add(td_Header)

		Dim img_header As Image
		img_header = New Image
		With img_header
			.ImageAlign = ImageAlign.AbsMiddle
			.ImageUrl = cs.GetWebResourceUrl(rsType, "redCopper.ice5.admin.Header-TestDrive-Right.gif")
		End With
		td_Header.Controls.Add(img_header)

		Panel.RenderControl(writer)

	End Sub
	<Bindable(True)> _
 <Category("Appearance")> _
 <DefaultValue("")> _
 <Localizable(True)> Property CssStyle_Text() As String
		Get
			Dim s As String = CStr(ViewState("CssStyle_Text"))
			If s Is Nothing Then
				Return String.Empty
			Else
				Return s
			End If
		End Get

		Set(ByVal Value As String)
			ViewState("CssStyle_Text") = Value
		End Set
	End Property

End Class

Marked as answer by Anonymous Thursday, October 7, 2021 12:00 AM

Saturday, December 5, 2009 2:44 AM

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User-1635004338 posted

Hi markiz,

Declare your control in web.config with namespace and assembly:

http://markitup.com/Posts/Post.aspx?postId=3c0625ff-d86f-4e2f-aabe-f47c9cca0999

Or a incompatibility issue:

http://www.codenewsgroups.net/group/microsoft.public.dotnet.framework.aspnet.webcontrols/topic9496.aspx

Thanks,

Sunday, November 29, 2009 10:40 PM
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User-16411453 posted

RenderDesignMode is for just rendering the control, so you can set properties, and adjust the look and feel of the control.

When you run the control, you can do anything you want with it. The render mode is sort of dumb, and is not a web browser. Some folks out there will differ with me, but design mode has it's limitations. So that why you have 2 routines, one for runtime, and one for designmode. You make a call to detect what mode your in, and display the appropiate code for it.

Sunday, November 29, 2009 11:03 PM
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User-1598340850 posted

Hi markiz,

Declare your control in web.config with namespace and assembly:

http://markitup.com/Posts/Post.aspx?postId=3c0625ff-d86f-4e2f-aabe-f47c9cca0999

Or a incompatibility issue:

http://www.codenewsgroups.net/group/microsoft.public.dotnet.framework.aspnet.webcontrols/topic9496.aspx

Thanks,

web.config didn't work, anyway why should it if the control already declared on the page like:

<%@ Register assembly="Editor" namespace="Editor" tagprefix="cc1" %>

And for the ncompatibility issue I use VS 2008 for both control and the web page.

Monday, November 30, 2009 2:16 AM
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User-1598340850 posted

RenderDesignMode is for just rendering the control, so you can set properties, and adjust the look and feel of the control.

When you run the control, you can do anything you want with it. The render mode is sort of dumb, and is not a web browser. Some folks out there will differ with me, but design mode has it's limitations. So that why you have 2 routines, one for runtime, and one for designmode. You make a call to detect what mode your in, and display the appropiate code for it.

So what are you saying is that i should display,on the design-time, "dummy" control?

I am sure there must be a way to do what I need....

Again this only happens when I try to deserialize a stream from resource, if I deserialize from filestream, ii works for both cases , design and run time.

Monday, November 30, 2009 2:25 AM