Asp.net - Dynamically Loading User Control In MVC?
Sep 16, 2011
I have a UserControl.ascx which essentially outputs the Name and Email of the user currently logged in (stored in session variables, for the record) at the top of every page on my website. Said control is currently called by Site.Master using <%Html.RenderPartial("UserControl")%>.
It works fine when I log in for the first time and my details are displayed correctly, but when I log out and try to log in again something strange happens...
The Control itself tests the condition Session("auth"), which my controller sets to true upon authenticating a user and which it forces to false when the logout button is pressed. All session variables are cleared upon logging out.
(For the record, my user control used to check Request.IsAuthenticated rather than Session("auth") to determine the current Session State. The same issue arised.)
The problem is that when I try to log in as a different user, instead of showing the new user's information in the header, nothing appears beside Name: and Email: (see code below). I suspect this is because UserControl.ascx is not updating its state.
Ideally, I'd like a solution which would force UserControl to check Session variables every time a page is loaded. Is there a clean way to achieve this?
<%@ Control Language="VB" AutoEventWireup = "false" Inherits="System.Web.Mvc.ViewUserControl" %>
<%-- The following line works around an ASP.NET compiler warning --%>
[Code].....
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Apr 22, 2010
I have a created a user control. This user control I dynamically load on a page inside Telerik Panelbar control. I have done all necessary coding to save the viewstate and load this dynamically created usercontrol every time page loads.On this User control I have a asp panel. By default this panel is invisible. When user clicks a button on this user control panel is made visible. On page load of this user control I populate all the controls on this panel.Everything works fine if I dont load this use control dynamically but when I load this user control dynamically and if I make panel visible by default then only all fields on the panel are populated. But if I make by default invisible and on button click make panel visible none of the text boxes or comboboxes are populated. I populate comboboxes on page load of the userControl but inbetween postbacks all the comboboxes on the user control loose data.[code]...
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Apr 14, 2012
I have a user control that is created within a tab control every time a user creates a new tab, so each tab on a tab control contains a new instance of the user control. From within the user control I would like to get the parent tab's index, so that I can dynamically alter properties of the tab, such as the tab's title.
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Oct 27, 2011
I have two usercontrols. One is loaded statically another dynamically.In the aspx page I can write as follows for static user control.
ProgramAddSchedule.onNewProgram += new AddProgram.OnNewProgramClick(onNewProgram_btnHandler);
But dynamically loaded control's event I am not able to get
Control myUserControl = (Control)Page.LoadControl("~/View/EditScheduleProgram.ascx");
How do I get the event of the dynamically loaded control?
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Feb 8, 2011
I have created a User Control in VB 2005 that adds other controls dynamically. This is a fairly simple test project, with checkboxes added to the control at run-time. Here's the user control:
Public
Class UserControl1
Public x
[Code]......
Then I built the test control and tried to added it to the Toolbox. When I did this--i.e., browsed to the dll and double-clicked it, I got the errror message:
"There are no components in ... that can be placed in the toolbox."
Is it even possible to add a User Control to the Toolbox without compile-time components?
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Nov 26, 2011
I have a user control which is essentially a main menu I can place it into my MasterPage hard-coded, but I don't want that, I want to be able to dynamically place it with the code behind of the MasterPage.
<controls:mainMenu ID='MainMenu1' runat='server' />
So what I am looking to do is something like
if **condition is true ** _ response.write('<controls:mainMenu ID='MainMenu1' runat='server' />')
Of course, I know that won't work, but how would I place the control based on a condition in code behind on the master page?
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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?
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Jun 20, 2011
I have the user control that is loaded dynamically. When the user save the data by clicking on the Save button, a raise event is passed.
Public Sub RaiseCloseEvent(ByVal sender As Object, ByVal e As System.EventArgs)
RaiseEvent Close(sender, e)
Debug.Print(String.Format("The control {{0}} was closed by {{1}}.", Me.Name, sender.ToString))
End Sub
In the save button I have called the RaiseCloseEvent as follows:
RaiseCloseEvent(sender, e)
Now, how can I close the user control form? Any Idea? I have used VB.Net language.
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Nov 20, 2009
i've read this somewhere before and was able to make it work, unfortunatelyi lost my sample codes and couldn't recall some parts, anyway, here's what i'm trying to doi have a couple of DLL with same methods and properties, instead of referencing them directlyto my main program i have a common interface which i have reference to in both main program and DLLs (implements), the main program is suppose to load whichever DLL it requires (so i was thinking of making it more like plug able), here's what i have so farINTERFACE CLASS
Code:
Imports System.Reflection
Public Interface MyInterface
[code]......
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May 25, 2009
I am writing a program and I want the program to support plugins. I created an interface that the program must implement. I am using the following code from my main program to call the plugin:
Dim asm As Assembly = Assembly.LoadFrom(ff.FullName)
' Get the type
Dim myType As System.Type = asm.GetType(asm.GetName.Name + "." + asm.GetName.Name)
' If the type is null then we try again without the root namespace name
[code]....
I set this property from my main program and everything works. Except, after a while, m_PanelObject gets set to Nothing for some odd reason. I'm not setting it to Nothing anywhere in my program and there is no place in the plugin code that sets it to Nothing.
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May 24, 2010
We've built a small component which takes an Id, looks up an entry in the database for an assembly/namespace/class, and dynamically loads an instance of the class that we're after. It has been working fine up until now, but when running this code in VS 2010, it's failing.
Private Function AssemblyLoaded(ByVal assemblyFile As String) As Assembly
Dim assemblies() As Assembly = AppDomain.CurrentDomain.GetAssemblies
For Each asmb As Assembly In assemblies
[Code]....
But it feels dirty. Is there a better way of checking if an assembly is already loaded, and handing that back to the caller? Are the issues above specific to .NET 4.0 or Visual Studio 2010? I haven't tried this outside the IDE as it requires fairly significant configuration.
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Aug 26, 2011
I have an asp.net web app that allows users to customize some GUI aspects (such as font color, add a custom logo etc). This information is stored in the user profile database. I have a css file that populates font colors etc. The main page, loads the users profile from the database, and customizes the page accordingly.Aside from having each label with its own "font-color=", how can I display the CSS elements, based on the user profile information returned from the database?
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Mar 25, 2009
I want to load picture dynamically within VB.NET and the following code does not work due to 'loadpicture' not existing in VB.NET.
picturebox.image=Loadpicture("tick.jpg")
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Oct 9, 2010
how to Load Image in Crystal report Dynamically?Im creating students id in crystal report.the image is accessible through path "C:mysoftwarepicturesstudent001.jpg"
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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.
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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.
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Oct 17, 2011
I have an aspx page that has two different user controls. I want to find user control A and be able to set properties, etc., from user control B.
I was thinking I could do something like this:
Dim CMFilters As Control = Me.Parent.FindControl("CMFilters")
...but that doesnt work to be able to set properties and call methods. I somehow need to get the user control and and declare it as that user control type.
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Jul 16, 2009
I have an application that dynamically creates winforms.
Dim NewS As New Form
Dim NewT as new Timer
NewT.Interval = 5000
[Code].....
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Dec 22, 2010
In a user control I have the code shown below.
I now realize that it is incorrect because the container's InitializeComponent property initializations have not run yet and they must be run prior to Refresh being called.
How (where) can I run Refreash after the container has initialized this user control.[cod]e...
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Aug 31, 2009
i am using vb.net 2005 to developed desktop application I am having two windows form user control , the first control name con.vb containing the design and code for connecting to database and getting a list of my project values in combo box.
Now the second user control report.vb which i am using to generate some reports , since the code behind is using connection to connect to various project database , so i want to get the value of
First user control into another how i can get the i have tried the below but its giving me error in run time but no error in design or code behind -
MR.MainForm.Connection1.project_combobox.SelectedV alue.ToString
Error i am getting is :
System.NullReferenceException was unhandled
Message="Object reference not set to an instance of an object."
Source="MDR"
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Aug 15, 2009
I am adding some controls to a panel at run-time. After I add them I need to loop through the panel in a different sub and test for a specific control. I was assuming that if I named the variable that the control is set to to "a", that I could then test for this by saying
[Code]...
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Jul 16, 2009
I have an application that dynamically creates winforms.
Dim NewS As New Form
Dim NewT as new Timer
NewT.Interval = 5000
[code]......
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Apr 25, 2011
I have a Windows Service that runs, and currently, it runs under whatever account installed the service onto the computer.Is there some way, using code, that I can switch the active user that the service runs as, dynamically, without any user interaction or GUI?
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Jun 23, 2012
I have been set a project from school to design snake in VB.Net but i am struggling to dynamically add the user control which acts as one of the dots in the body of the snake. Every time i add a dot on to the snake the previous vanishes. I assume this is due to me overwriting the previous one by creating a new instance of the object but i cannot find a way of adding a new one in.[code]I have tried using body(i) and other ways of adding a new instance of the object but am stuck.The subroutine will be called up when a new control is needed.
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Apr 15, 2010
In my .aspx page I have;
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" AspCompat="True" %>
<%@ Register src="Modules/Content.ascx" tagname="Content" tagprefix="uc1" %>
<!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">
[code]....
The result is an empty placeholder and no errors. P.S after Fat_Tony's answer I changed the code to;
Try
Dim loadmodule As ASP.ContentModule
loadmodule = CType(LoadControl("~ModulesContent.ascx"), ASP.ContentModule)
[code]....
But still no results unfortunately.
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Jun 22, 2010
Ive been working on a checkbook application for my visual basic class and I'm a little stumped..
To preface, the values I need to mess with include:
transaction type (checking or deposit)
DTP
check number ("dep" if deposit)
[Code].....
Below is the Change I need to make to my program...
"You will create a set of either collections or arrays (your choice but use just one or the other--don't mix them) scoped at the form/module level. These structures will store all of the input data needed for your checkbook transactions except for the running balance which will continue to be stored in a single module-scoped variable. That is, every input that users made in Assignment 3 will be stored in one of these arrays but you will not store any calculated values. You will not store the transaction type but will store "Dep" or a number in the check number array which will also indicate the transaction type. The Record button will add the current sale's data to these structures using either ReDim for the arrays or an appropriate technique for the collections. (You must ReDim your arrays so that the have just enough space for the data that is in them. Declaring the arrays with a large size with no facility to resize them is not allowed. Don't forget to use the ReDim Preserve syntax to retain the existing array contents when you resize them.)"
I don't know if I make a single array for all the values or if I create a separate one for each. If its a separate one for each I don't understand why an array is needed.
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Apr 16, 2012
Ok, as you can see I am totaly new with Visual Basic. I have learned all those loops, if&else statements, byval, byref and etc. But now, I want to create this kind of application. I have 3 textboxes. One will contain URL, second username, and last password. There is a listbox also and a button. I want when user add a values inside textboxes , that values go to listbox as one variable and then save those settings for user so when he start up application again there are saved variables inside listbox. I just dont know how to do that.
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Mar 27, 2009
I am trying to build a tournament bracket application. In order to build the application efficiently I would like to make a user control "GameControl" that represents a game and give it attributes that represent the names of the competitors "TeamNameA" and "TeamNameB" ,an attribute "Winner" to represent which team should move on, and an attribute "NextRoundGame" that assigns another instance of the user control so that it can assign the "winner" to one of the "TeamName" attributes of the next round in the competition. If the controls were native to VB I feel like I could do it easily (I have only spent about 30 hours self teaching/tutorial following) but I can't seem to find out how to pass values to custom attributes of custom user controls through code.
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Feb 27, 2012
I have a User Control which returns a table of data, which in some cases needs to be looped, displaying one on top of another. I am able to dynamically add a single instance of this by placing a fixed placeholder in the page. I am now trying to work out how to add more than one, given that I don't know how many might be needed I don't want to hard code the Placeholders. I've tried the following, but I am just getting one instance, presumably the first is being overwritten by the second
My HTML
<div id="showHere" runt="server"/>
VB
Dim thisPh As New PlaceHolder
thisPh.Controls.Add(showTable)
showHere.Controls.Add(thisPh)
Dim anotherPh As New PlaceHolder
anotherPh .Controls.Add(showTable)
showHere.Controls.Add(anotherPh)
How do I make it add repeated tables within the showHere div?
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Dec 14, 2011
I'm working with ASP.NET and VB.NET. I have a page which contains 5 user controls. the page itself does nothing, it just presents the user controls to the user.
The user controls work fine when I come on the page, or when I refresh, but when I go to another page, and press 'Back' only two of my user controls shows up, and they don't work like they're supposed to!
Short description of the controls:
2 controls which look if the user has to create something and shows an option to do so. (goes to the DB)
2 controls show an overview if needed (goes to the DB)1 control looks if the user is an admin (does not go to the DB, but looks in the securityContext)
[Code]...
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