.net - Load User Control Programmatically Using LoadControl(Type, Object())?
Feb 25, 2012
I'm adding web user controls to a page dynamically. Using the LoadControl method that only takes a virtual path pointing to the .ascx works pretty nicely. However, the overload of LoadControl that takes a type and an array of parameters is causing me some headaches. The web user control is instantiated as expected, but the controls contained within the web user control are null and I get an exception as soon as I try to work with them. Strange, because it's working when use the first version of LoadControl.
The web user control, simple, with a Literal control:
<%@ Control Language="vb" AutoEventWireup="false" CodeBehind="MyControl.ascx.vb" Inherits="MyControl" %>
<asp:Literal ID="myLiteral" runat="server"></asp:Literal>
The controls' code behind:
Public Class MyControl
Inherits System.Web.UI.UserControl
Public Property Data As MyData
[code]....
And the relevant code from the .aspx from which I'm trying to dynamically load the control:
Private Sub Page_Init(sender As Object, e As System.EventArgs) Handles Me.Init
Dim x = LoadControl(GetType(MyControl), New Object() {New MyData With {.ID = 117}})
Page.Controls.Add(x)
[code]....
View 2 Replies
ADVERTISEMENT
Jan 16, 2009
I'm helping a colleague develop a "catch all" type error handler for some controls his application. What he wants to do is pass the object that has the error, and the type of that object, such a TextBox or ComboBox, and then call the DirectCast method within his handler to properly address the Text attribute within it. In general, the method is looking like this:
Protected Sub SpecialErrorHandler(ByVal TargetControl As Object, ByVal ControlType As String)
MessageBox.Show("Bad Juice: " & DirectCast(TargetControl, ControlType(ObjType)).Text)
End Sub
So far any attempts to do a type conversion within the DirectCast method (since it is expecting an object in the general signature) or to even pass in the a Type object properly set is not working.
Any ideas here, or is this one of those "Casting doesn't work that way." type scenarios?
View 2 Replies
Apr 27, 2011
For example we generally apply threading to make application faster and unnecessary timetaking not related to UI things can go in secondary threads.Now If I have a user control
This control contains a public function LoadControl() Function is called from the form which is using the user control In side function
[Code]...
View 1 Replies
Feb 7, 2012
I have a UserControl that has a simple repeater inside. It has a property called data which when passed into the control populates the repeater using the standard databinding.
On a page I have a placeholder.
I have a loop which does the following
Dim qDetail As New UserControls_ReportDataTable
qDetail = DirectCast(LoadControl("~/UserControls/ReportDataTable.ascx"), UserControls_ReportDataTable)
[Code].....
View 1 Replies
Jun 5, 2012
How to add a control like picturebox programatically and Allow user to move it with mouse? on google but cant find anything. Thats why I am here. In my application user creates a picturebox and a label at runtime by selecting a file from drag drop. User can create as many files he wants. But the problem is that I dont know that how to move both picturebox and label to change their location in a flowlayoutpanel which contains these controls with mouse. I know that how to add a control like picturebox programatically but dont know how to move it. I add picturebox by:
dim picturebox as new picturebox
flowlayoutpanel1.controls.add(picturebox)
View 3 Replies
Dec 22, 2011
I am upgrading user control from vb6 to vb.net.In the vb6 application I am loading 3000 labels using a label control array.In vb.net I am doing same but it's taking too much time to load.In vb6 it's taking 1-2 seconds, but in vb.net it's taking 30-40 seconds for same work. Why does it take too much time in vb.net for same work?Code is given below, here Led is the label control array.
For l = 1 To 3000
Led.Load(ledCounter)
ColLed.Add(Led(ledCounter))
[code]....
View 1 Replies
Feb 10, 2012
I have created a custom user control (JCUserControl), and I am using it in the Main Window. And my Main Window has no codebehind. I have this in the JCUserControl codebehind:
Private Sub ImmediateRadioButton_Checked(sender As System.Object, e As System.Windows.RoutedEventArgs) Handles ImmediateRadioButton.Checked
SomeTextBox.IsEnabled = False
End Sub
When I run it, it fails with the NullReferenceException. If I comment out the SomeTextBox.IsEnabled = false, it runs without any problems.
Edit: Found out that I could just check if the radio buttons are loaded before doing whatever I want to do.
Private Sub ImmediateRadioButton_Checked(sender As System.Object, e As System.Windows.RoutedEventArgs) Handles ImmediateRadioButton.Checked
If ImmediateRadioButton.IsLoaded Then
SomeTextBox.IsEnabled = False
End If
End Sub
View 1 Replies
Jan 21, 2012
I have a User Control which is a customer input form.I'm working on a sales system, when generating a sale, the customer data is populated by a Javascript Auto Complete, but when loading a saved sale, I need to paste a User ID into the control programatically.
<controls:customerDataForm ID='customerForm1' partExchangeMenu="true" showBankDetails="false" customerID="****" runat='server' />
Renders my control on the page within the markup of the parent document (in this case it's called newSale.aspx)In the code behind in newSale.aspx.vb I need to be able to programmtically change the value of the Controls customerID attribute. I can't seem to do it.This is what I have done, following various Googling attempts, but it is always leaving the customerID as zero
Protected Sub Page_Init(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Init
customerForm1.customerID = "0" '// default Customer ID if no invoice number
If Request.QueryString("invno") <> "" Then
[code]....
View 1 Replies
Jun 22, 2010
I have a simple application, that was working just fine then all of the sudden I open the file and the design pages will not show up and I get the following warnings:
Warning 1 Could not load type 'System.Object' from assembly 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' because the parent does not exist. G:ProgramsCONNS v 1.0ConnectionsFrontPage.Designer.vb 149 0
View 4 Replies
Feb 25, 2009
Anyone can suggest what's wrong to the code below as the User Control objects ONLY appear in the first tab and NOT in the balance tabs ?
1) User Control name - usRFQDetail
2) Tab Control name - tcRFQDetail
View 1 Replies
Jan 13, 2010
what's wrong to the code below as the User Control objects ONLY appear in the first tab and NOT in the balance tabs ?
1) User Control name - usRFQDetail
2) Tab Control name - tcRFQDetail
Dim tcPage As New TabPage
[code].....
View 2 Replies
Nov 11, 2010
When control passes to the textbox I type one character and control immediately goes to the next object(lbxAnnl)). I suspect it may be related to the "TextChanged" event but I didn't see any other events that looked relivent. I was expecting to terminate the input with a carriage return.
[Code]...
View 5 Replies
Apr 26, 2011
I dynamically load a user control in a form (Form 1).
In my user control there are two things :
a Textbox (TxtBox1) and a Command Button
WHen the button is clicked, it opens a new form (Form 2) Form2.ShowDialog()
My question is, in Form 2, how can i set a value to TxtBox1 of the user control?
View 2 Replies
May 17, 2012
I have a project which has a couple of tabs on form, an usercontrol is on the 2nd tab, when the form loads, i want the load event method of the usercontrol to fire, and the message box should pop up.Please see the attach file, the message box only pop up after the form is loaded and the 2nd tab is clicked, not when just the parent form is loaded.
View 5 Replies
Apr 4, 2011
I can load a generic user control just fine in my WCF service doing the following:
UserControl userControl= (UserControl) new Page().LoadControl("~/UserControls/MyControl.ascx");
However i can't seem to find any way to do this
[code].....
View 2 Replies
Nov 30, 2009
I am trying to create a vertical progressbar type user control.
I want to be able to set the max / min of the progressbar as well as setting the value
But the thing I want is able to have green at the bottom fading into red up the top like in this image: [URL]
But I don�t know how or where to start.
Is there a custom progressbar I can use?
View 1 Replies
Jan 5, 2012
creating a user control object in runtime using createobject function or whatever better function in vb.net.
here is my code:
Dim b As New Security.Sec_Role
b.Name = "Sec_Role"
b.visible = true
[Code]....
View 3 Replies
Mar 8, 2012
I am creating a User Control where I have a property called Items. Items is of type LibraryPanelBarItem Collection (custom class) which contains a collection of LibraryPanelBarItem objects. I would like to be able to add these at design time by using the Collection editor that VS uses for adding things such as treenodes/listviewitems. Ideally I would also be able to declaratively add them to the html syntax. I can get the Items property to show up but I get no intellisense to add the items between the opening and closing tags. [Code]
View 1 Replies
Nov 29, 2011
Is it possible to create a user control with a list of custom class type property? If it is, how can I? The issue is that, in designer mode the property is not displayed in property window. I can add the list on markup but when i switch to the designer mode it gives an error which is 'The user control does not have a public property named BookList'.
View 1 Replies
May 7, 2009
This error makes no sense to me[code]...
Unable to cast object of type 'DynamicTreeNode' to type 'DynamicTreeNode'.
I have an inherited TreeView with an inherited class called DynamicTreeNode inside it. I am trying to loop through the DynamicTreeNodes in the TreeView.Nodes property which is causing this error.
View 10 Replies
Jan 25, 2011
For I = 0 To 10
If Items.Count = 0 Then Exit For
Dim T As New Thread(AddressOf Thread)
T.Start(New Object() {"Test", "Test"})
[code]....
When I put same code in empty project it works.
View 5 Replies
Jul 5, 2010
I've got a piece of code in a project (MyProject) that contains early bound object from a referenced assembly (We'll call it CommonAssembly):
Dim myObject As CommonAssembly.MyEarlyBoundType
now I have another assembly that is dynamically loaded because it is not present in all projects:
Dim myLateBoundObject As Object = AppDomain.CurrentDomain.CreateInstanceAndUnwrap("Utils", "Utils.MyLateBoundType")
MyLateBoundType derives from CommonAssembly.MyEarlyBoundType, and I want to cast myObject to myLateBoundObject and then programmatically invoke the additional
[Code].....
View 1 Replies
Apr 5, 2009
i always get this error when i tried to update my table: Unable to cast object of type 'System.Object[]' to type 'System.String[]'.
i only want to update STATUS, ENDTIME, and PRICE
the data type of each field are:
STATUS = nvarchar
ENDTIME = smalldatetime
PRICE = money
[Code]....
View 1 Replies
Dec 30, 2009
how I can dynamically load a control inside of a shared/static function?The function itself is inside of a mustinherit/abstract class.(It's an ASP.NET project in VB) I want to do something like this:[code]I'm getting "Cannot refer to an instance member of a class from within a shared method or shared member initializer without an explicit instance of the class.",but I don't understand this error.I understand what it means, I just don't understand why calling LoadControl isn't seen by the compiler as being an explicit instance of the class. What's not explicit about using LoadControl to create a new control from a file? I tried creating a new user control and initializing it, then setting it to a different control with LoadControl to no avail.I also don't want to do a DirectCast because I'm trying to put this in a shared, mustinheret (abstract) class, which therefore doesn't have an .aspx file to write in a <%@ Reference Control="~/SomeControlPath.ascx" %>, so the class name is unavailable.What I'm trying to do is write a static function that takes some value and returns a control based only on that control's source file location.The end result is a user-modifiable list of controls.They get a column of controls that they freely add, remove, or reorder based on a static list of available child controls that I specify.
View 4 Replies
Nov 6, 2009
I have an application going here Form1 has a panel on it named TargetPnl. I need my TargetPnl to display my user control named Vviewer when I click my SearchBtn and also need it to disappear when I click another button.
View 1 Replies
May 11, 2012
I have a string which contains XML. I want to create an XMLdocument from this. I am using Load and LoadXMl methods like this:
Dim doc As XmlDocument
doc.LoadXml(applicationXml)
but they are retuning:
Object reference not set to an instance of an object.
My XML looks like this:
<gate.util.persistence.GateApplication>
<urlList class="gate.util.persistence.CollectionPersistence">
<localList>
[Code]....
View 1 Replies
Apr 28, 2011
I have code like this which loads a control from an .ascx file, calls some methods of the control, then renders it:
Option Explicit Off
Sub renderMyControl(p As Page)
Dim ctrl as Object = p.LoadControl("path/to/myControl.ascx")
' ... do stuff with ctrl ...
[Code]...
This code only works because Explicit is off. I would like to use CType to convert the control to its "strong type" (and get rid of Option Explicit Off) but I don't know how to add a reference to the type. How can I do this?
View 1 Replies
Jul 4, 2010
I want to dynamically load UserControls with LoadControl which contain their own updatepanels, and when they're on the page, be able to trigger their updates individually via their children.
To explain better, see my extremely simplified example of my issue:
Default.aspx
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
[Code].....
View 1 Replies
Jun 16, 2010
I created a simple user control and everything went fine.Then I created another of the same control (as a different project) from scratch (creating the controls in a different configuration; but pasting code from the previous one from a text file).As far as I know I did everything the same for creating a user controlCreate a Class Library project Then Project>Add New Item> User Control Then delete the initial class that was added automatically (usually named Class1.vb) Put all of my code and components into the user control class.However, when I wanted to run it in the debugger as I did in the previous project, I now get an error message:"A project with an Output Type of Class Library cannot be started directly."
View 6 Replies
Apr 11, 2009
how can i call a VB function - deleteevent() in usercontrol.ascx.vb from a javascript function in clickhandler(e) in usercontrol.ascx. The call should cause a postback because I need the usercontrol to display the changes.I am currently trying to do it by using a linkbutton with style display:none, and calling its click event from the javascript function. But i dunno how to call the click event.
View 2 Replies
