Re: Dynamically adding custom control

From: stcheng@xxxxxxxxxxxxxxxxxxxx (Steven Cheng[MSFT])
Date: Sat, 19 Nov 2005 14:01:55 GMT

You're welcome Terry,

Regards,

Steven Cheng
Microsoft Online Support

Get Secure! www.microsoft.com/security
(This posting is provided "AS IS", with no warranties, and confers no
rights.)
--------------------
| From: "Terry Holland" <terryeholland@xxxxxxxxxxxxxxxx>
| References: <#l8Ze376FHA.1188@xxxxxxxxxxxxxxxxxxxx>
<jlvfhG$6FHA.832@xxxxxxxxxxxxxxxxxxxxx>
| Subject: Re: Dynamically adding custom control
| Date: Fri, 18 Nov 2005 15:12:33 -0000
| Lines: 218
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microsoft.public.dotnet.framework.aspnet.buildingcontrols:14006
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|
| We meet again Steven.
|
| Ive modified my code to remove the New keyword and added the LoadControl
| method in my page to load the control and now the user control appears on
| the screen.
|
| Thanks
|
| Terry Holland
|
|
| "Steven Cheng[MSFT]" <stcheng@xxxxxxxxxxxxxxxxxxxx> wrote in message
| news:jlvfhG$6FHA.832@xxxxxxxxxxxxxxxxxxxxxxxx
| > Hi Terry,
| >
| > As for ASP.NET Usercontrol(ascx...), the Control instances are all
defined
| > in the .ascx template file(if not dynamically adding control...), so we
| > should not declare "New" for control reference like:
| >
| > Protected WithEvents txt As New System.Web.UI.WebControls.TextBox
| >
| > If you get error when not using "New", there must have something
incorrect
| > in our page or code logic. Would you also provide the ascx template
| > together with the code behind?
| >
| > In addition, for dynamically adding Usercontrol onto aspx page, we
should
| > use the Page.LoadControl method to load the "xxx.ascx" so as to create
the
| > UserControl instance and add it into Container control in each Page
| > Request....
| >
| > If there're anything unclear, please feel free to post here.
| >
| > Regards,
| >
| > Steven Cheng
| > Microsoft Online Support
| >
| > Get Secure! www.microsoft.com/security
| > (This posting is provided "AS IS", with no warranties, and confers no
| > rights.)
| >
| >
| > --------------------
| > | From: "Terry Holland" <terryeholland@xxxxxxxxxxxxxxxx>
| > | Subject: Dynamically adding custom control
| > | Date: Thu, 17 Nov 2005 21:28:24 -0000
| > | Lines: 149
| > | X-Priority: 3
| > | X-MSMail-Priority: Normal
| > | X-Newsreader: Microsoft Outlook Express 6.00.2900.2527
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| > | X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527
| > | Message-ID: <#l8Ze376FHA.1188@xxxxxxxxxxxxxxxxxxxx>
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| > microsoft.public.dotnet.framework.aspnet.buildingcontrols:13997
| > | X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet.buildingcontrols
| > |
| > | Im trying to dynamically add a user control for a webform but it is
not
| > | appearing when I run the form.
| > |
| > | I have pasted the code that I am using. Can someone advise what Im
| > doing
| > | wrong. My user control (ctlTextBox) contains one textbox. When I
| > dragged
| > | this onto the control, the line
| > |
| > | Protected WithEvents txt As System.Web.UI.WebControls.TextBox
| > |
| > | was added the declarations area of the code module. Without changing
| > this
| > | to
| > |
| > | Protected WithEvents txt As New System.Web.UI.WebControls.TextBox
| > |
| > | An error is generated on my page as soon as I hit the line
| > |
| > | .Text = "Tesing Control"
| > |
| > | Also, if I drag ctlTextBox onto my form at design time, it displays OK
| > |
| > |
| > | ==========================
| > | User Control Code
| > | ==========================
| > | Public Class ctlTextBox
| > | Inherits System.Web.UI.UserControl
| > |
| > | #Region " Web Form Designer Generated Code "
| > |
| > | 'This call is required by the Web Form Designer.
| > | <System.Diagnostics.DebuggerStepThrough()> Private Sub
| > | InitializeComponent()
| > |
| > | End Sub
| > |
| > | '############################################################
| > | '## This is the code that was generated
| > | ############
| > | '## but without the New keyword, a runtime error is generated
| > | ############
| > | '## when I try to set the Text property on the page
| > | ############
| > | '############################################################
| > | 'Protected WithEvents txt As System.Web.UI.WebControls.TextBox
| > | Protected WithEvents txt As New System.Web.UI.WebControls.TextBox
| > |
| > | 'NOTE: The following placeholder declaration is required by the
Web
| > Form
| > | Designer.
| > | 'Do not delete or move it.
| > | Private designerPlaceholderDeclaration As System.Object
| > |
| > | Private Sub Page_Init(ByVal sender As System.Object, ByVal e As
| > | System.EventArgs) Handles MyBase.Init
| > | 'CODEGEN: This method call is required by the Web Form
Designer
| > | 'Do not modify it using the code editor.
| > | InitializeComponent()
| > | End Sub
| > |
| > | #End Region
| > |
| > | Public Property Width() As Integer
| > | Get
| > | Return txt.Width.Value
| > | End Get
| > | Set(ByVal Value As Integer)
| > | txt.Width = Unit.Pixel(Value)
| > | End Set
| > | End Property
| > |
| > | Public Property Text() As String
| > | Get
| > | Return txt.Text
| > | End Get
| > | Set(ByVal Value As String)
| > | txt.Text = Value
| > | End Set
| > | End Property
| > |
| > | Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
| > | System.EventArgs) Handles MyBase.Load
| > | 'Put user code to initialize the page here
| > | txt.CssClass = "Editable"
| > | End Sub
| > |
| > | End Class
| > | ===========================
| > | End User Control Code
| > | ===========================
| > |
| > |
| > | ===========================
| > | Page Code
| > | ===========================
| > | Public Class pgeTest
| > | Inherits System.Web.UI.Page
| > |
| > | #Region " Web Form Designer Generated Code "
| > |
| > | 'This call is required by the Web Form Designer.
| > | <System.Diagnostics.DebuggerStepThrough()> Private Sub
| > | InitializeComponent()
| > |
| > | End Sub
| > |
| > | Protected WithEvents Panel1 As System.Web.UI.WebControls.Panel
| > |
| > | 'NOTE: The following placeholder declaration is required by the
Web
| > Form
| > | Designer.
| > | 'Do not delete or move it.
| > | Private designerPlaceholderDeclaration As System.Object
| > |
| > | Private Sub Page_Init(ByVal sender As System.Object, ByVal e As
| > | System.EventArgs) Handles MyBase.Init
| > | 'CODEGEN: This method call is required by the Web Form
Designer
| > | 'Do not modify it using the code editor.
| > | InitializeComponent()
| > | End Sub
| > |
| > | #End Region
| > |
| > | Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
| > | System.EventArgs) Handles MyBase.Load
| > | BuildControls()
| > | End Sub
| > |
| > |
| > | Sub BuildControls()
| > | Dim tb As New ctlTextBox
| > | With tb
| > | .Text = "Tesing Control"
| > | End With
| > | Panel1.Controls.Add(tb)
| > |
| > | Dim txt As New TextBox
| > | txt.Text = "Hello"
| > | Panel1.Controls.Add(txt)
| > |
| > | Dim lbl As New Label
| > | lbl.Text = "Label"
| > | Panel1.Controls.Add(lbl)
| > |
| > | End Sub
| > |
| > | End Class
| > | ===============================
| > | End of Page Code
| > | ===============================
| > |
| > |
| > |
| >
|
|
|

.

Follow-Ups:
- Unable to access my user control.
  - From: DS

References:
- Dynamically adding custom control
  - From: Terry Holland
- RE: Dynamically adding custom control
  - From: Steven Cheng[MSFT]
- Re: Dynamically adding custom control
  - From: Terry Holland

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