Web Forms :: Dynamically Loading UserControl From DLL?
Nov 15, 2010
I would like to load UserControl dynamically from DLL in the bin directory.
The dll contains several usercontrols which dynamically create webcontrols within them.
I do not have Virtual Path of the UserControls to use in LoadControl(String virtualpath) and LoadControl(Type, object[]) does not work(why the heck is it there in the first place anyways).
provide me some sample code which takes either the path of dll or assembly name "ServerControls" to load usercontrol "UserControl1" dynamically into placeholder "PlaceHolder1"
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Similar Messages:
Feb 16, 2011
So I'm trying to dynamically load a usercontrol into a placeholder in another usercontrol inside a updatepanel.
basically I've got this markup:
<asp:UpdatePanel ID="upPopup" runat="server">
<ContentTemplate>
<UC:Popup runat="server" ID="UC_Popup" />
</ContentTemplate>
</asp:UpdatePanel>
And then this markup inside that usercontrol (Popup):
<div id="modal">
<asp:PlaceHolder ID="phPopupPlaceholder" runat="server"></asp:PlaceHolder>
<asp:Label ID="lblModal" runat="server"></asp:Label>
</div>
In the codebehind of the popup usercontrol I have:
public void Show(UserControl control) {
this.phPopupPlaceholder.Controls.Add(control);
this.lblModal.Text = "Loaded";
}
And I call this show method elsewhere with:
Popup.show(new MyUserControl());
Nothing loads into the placeholder though.
But in the show method I can load regular server-controls fine like this:
this.phPopupPlaceholder.Controls.Add(new Label(){ Text = "Label!" });
Can anyone explain to me why regular controls are loaded fine, but my usercontrol isn't loaded?
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Jun 25, 2013
Yesterday i asked from u 'Adding-WebUserControl-to-the-page-or-panel-by-client-side-code'.
from scratch it do'snt work properly. but today I downlowded again. its work rightly.
but it just show one control on it (just show lblMessage).
How Can i shows any number of controls on the WebUserControl. ex: button, picture, ...?
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Jul 28, 2010
if Panel have any aspnet control,panel not popups.otherwise working.whats wrong here ? is it impossible ?
[Code]....
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Mar 17, 2011
I've a ASP.Net page (Default.aspx) which will load UserControl (ucontrol.ascx) dynamically into an UpdatePanel. By using UpdatePanel, we believe we're able to prevent the entire page to be posted-back.
My problem is, within the UserControl, we have some form controls, such as inputs and buttons; after the UserControl is loaded, clicking on any button inside the UserControl will cause the UpdatePanel to be blanked. During the investigation, I found that, breakpoints within the Button1_Click() in the code-behind for the UserControl is never reached. Please reference to the code below, this references to [REFERENCE]1.
[code]....
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Feb 14, 2011
I ma trying to load a usercontrol into a table. My usercontrol contains some literal controls.
I can't set the text of these literal controls to anythign, as in my code-behind of my control, whenever I try to access my controls, they come back as null.
My user control code:
[code]....
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Mar 14, 2011
I have an asp.net page that has menu which loads user control dynamically when the menu item is clicked.Now in the user control i have some buttons calling javascript on clientClick.When i click this button,it throws javascript error
Microsoft JScript runtime error: '(function name)' is undefined
Here is the code snippet:
function CheckUpload() {
var flag = validatePage();
var Checktext = $("#HyperLinkUploadFile").val();
if (Checktext != '' && flag)
flag = true;
return flag;
}
<asp:LinkButton ID="btnNotifyOA" runat="server" Text="Recommend Award and Notify OA & AO"
ValidationGroup="Notify" OnClick="btnNotifyOA_Click" OnClientClick="return CheckUpload();" />
The above linkbutton and javascript is inside a usercontrol.
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Oct 12, 2010
In the process of migrating an old VS2003 web app to VS2008, I'm running into this issue and haven't been able to find a resolution. Sample code: "Default.aspx" has a PlaceHolder(ToolHeader). In the Page_Load(), we dynamically load a user control passing in the virtual path to a helper method [public Control ParseUserControl(string virtualPath)]. This reads the content from the physical path, returns
a Control from ParseControl() method. I immediately get the following error when I open the default.aspx page in browser.
Parser Error
Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately. Parser Error Message: Could not load type 'DynamicUC.UcControl'.
Source Error:
Line 1: <%@ Control AutoEventWireup="true" CodeBehind="UcControl.ascx.cs" Inherits="DynamicUC.UcControl" %>
Can't figure out why it can't load the type. Namespaces are looking right. I try removing the Inherits="DynamicUC.UcControl" attribute from the "ucControl.ascx", it loads the page fine. Also, this control is a simple one and has no code behind. There are others with actual code behind. They won't work if I remove the Inherits attribute.
[Code]..........
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Jun 5, 2010
I have usercontrols which are loading at runtime in my aspx... (This part is working fine).
Now i need to invoke the methods of the user control which has been loaded..
How to invoke those methods??
like if i have 3 methods in usercontrol which is loaded at runtime:
[Code]....
Now how to invoke these methods at runtime?
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Apr 23, 2010
I have added usercontrols to aspx webpage. But usercontrols page_load event is firing twice every time. tell me how to resolve this issue.
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Jan 29, 2011
On my page I have a placeholder where I load a usercontrol when I select an item in dropdownlist.
protected void ddlLoadCtr_SelectedIndexChanged(object sender, EventArgs e)
{
Control userControl = LoadControl("../AleSettings1.ascx");
plchldSettingsControl.Controls.Add(userControl);
}
If I press F5 (IE) after user control was rendered, I get IE's warning window that IE needs to resend the information....
How can I prevent it and why does it happen?
UPDATE:Maybe there is another approach? I want to load specific control (with it's markup) when user selects it from the dropdownlist.
if a postback is made the control shouldn't disappear(only if another control was selected from the dropdownlist) Everything is inside update panel!
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Jan 28, 2011
Is there a way of stopping the main page waiting for a usercontrol to load before it can finish loading?
I have a usercontrolthat has to do a lot of DB calls which can take a few seconds making the page slow to load. Ideally I'd like the main page to load straight away and then the usercontrol content appear when it is ready.
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Mar 29, 2010
I am trying to add UserControl dynamically to the page. UserControl is added only once (when the page loads) but on postback it doesn't add again (Only one control is alwasys there).I want to add user control Whenever user clicks "btnAddUCWingControl" so when the page loads for first time, there will be only one control, on postback there must be TWO controls and so on
Here is my .aspx (this is content page)
[Code]....
My .aspx.cs file is
[Code]....
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Jan 19, 2010
Im trying to add a new "Question UserControl" dynamically to my page each time the user presses "Add question". This works fine and the last control gets deleted when the "Delete question" is pressed. My problem is that in each of the "Question UserControls" i have a placeholder where i would like to add a new Textbox when the user presses "Add answer" and then delete it once the "Delete answer is pressed". The way it works now when i press add answer, an Answer Textbox gets added to the placeholders in all the added Usercontrols. But i only want to add it to the one UserControl where the user pressed "Add answer".
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May 3, 2010
i want load a usercontrol dynamically and pass a string to it ho do i do it..
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Jan 19, 2011
I have UserControl that has asp control(<asp:Button runat="server" ID="btn" />) and I want to render it.
I tried 1
[Code]....
It doesn't works because it says that each control that has runat="server" must be in Form.I also tried 2:Because loader.Form is null, I create HtmlForm and added the ctrl to it and then added HtmlForm to loader's Control, BUT it says that it has 2 HtmlForm. So, instead I "injected" HtmlForm to loader like this
[Code]....
Now no error is occurred, BUT StringWriter is empty. don't tell me to add Page to solution and override OnRender. I want to do it as I mentioned above.
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Oct 9, 2010
I was wondering if it is possible to upload the .ascx and .ascx.vb of a custom usercontrol into my project directory at runtime via an upload control and then after that use through a database query point my page to load that newly uploaded control via (LoadControl(<newlyUploadedControl>)?
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Nov 16, 2010
When it comes to the usercontrol specially when they are loaded dynamically on the basis of certain conditions then it becomes a very confusing work. I have read in many forums that the dynamic controls have to be loaded in OnpreInit or OnInit. Some of those links are[URL] But this is useful only when if the we know that we have to load UserControl1, UserControl2 without considering any conditions. But what if I have a Tab control and for each Tab Click I have to load the UserControl dynamically. In that situation how can we add the control in either OnPreInit or OnInit. If I am not mistaken then in such case, then we can add usercontrol in certain events. If we are using a TabControl then we load in Tab_Click , if we are using Menu Control then we use Menu_Click and depending
upon the particular tab or Menu we load associated usercontrols. Hence in these conditions, how can we go with the logic mentioned by above links. I have this confusion for very long time . I am posting little portion of my project here. I am using RadTabControl but it doesnt matter if it is Microsoft TabControl. In the aspx, I have a code to define RadTabControl.
<telerik:RadTabStrip
ID="tabMemberDetails"
runat="server"
Skin="WebBlue"
MultiPageID="tabDetails" SelectedIndex="0"
Align="Justify"
ClickSelectedTab="true"
EnableViewState="false"
ReorderTabsOnSelect="true"
Width="1139px"
OnTabClick="tabMemberDetails_Click" ScrollChildren="true">
</telerik:RadTabStrip>
In the code behind, I am loading usercontrol on the basis of the particular TabClick. tabMeberDetails_Click fires whenever I click on the tabs.ViewState["ControlName"] stores UserControlName on the basis of certain condition and finally i load the usercontrol.
proteced void tabMemberDetails_Click(object sender,
RadTabStripEventArgs e)
{
Conditions......
{
ViewState["ControlName"]=........
}
viewDef=ViewState["ControlName"]
UserControl control = (UserControl)LoadControl("~/Controls/"
+ viewDef + ".ascx");
after this I add control to the RadTabStrip.................. and call bind method.........
}
As you can see from above, I am loading my usercontrol in tabMemberDetails_Click event. I see no other choice to do it in OnPreInit. Can anyone answer if this is the right way to do or there is another way that complies with the logic in the links given above.
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Aug 7, 2010
I have this user control :
[Code]....
and i load it dynamicly in Default.aspx like this :
[Code]....
How can I pass the title value ?
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Jan 19, 2011
i have a BaseMasterUserControl.ascx and i have create a another ChildUserControl1.ascx
and ChildUserControl2.ascx, both are inherit from a BaseMasterUserControl.ascx.
i have hosted the BaseMasterUserControl.ascx in an aspx page. At runtime i am deciding
which usercontrol should be load. so i am loading a specific usercontrol dynamically and
assigning it to baseusecontrol but content are not visual, is this possible?
Code:
[code]....
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Sep 22, 2010
I have a table where each cell contains an ImageButton, with an iterative ID:
[Code]....
I am then trying to assign a URL to each imagebutton dynamically in a separate code file
[Code]....
Everything compiles, but when I run this I throw a Null Reference Exception: {"Object reference not set to an instance of an object."}
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Aug 25, 2010
i would like to load a banner on to the page based on the registration count we have in the DB. if the registration count is >70, i will have to load banner2 on to the page. i am doing like this On the webForm.aspx
<img src="images/banner1.jpg"
runat="server"
id="imgs"/>
in the code behind
protected void Page_Load(object sender,
EventArgs e){
if (!Page.IsPostBack)
{
if(isSessionOneFilled())
{
imgs.Src = "images/banner2.jpg";
}
}
}
The above code works. is it Good Programming to load html files from codebehind? is there any alternative way? how does this impact when internet speed is slow?
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Nov 15, 2010
The web page I am trying to (slowly) build should allow users to add whichever user controls they want on their page, and order them whichever way they like. This is saved in a database.
So each user could have a different number of controls on the page.
This is the design code, at the minute the user controls are fixed and are not loaded dynamically. They user controls are stored in 'blocks' which look like widgets on the page and can be dragged about to different columns. For each user the layout is stored in the DB i.e. which blocks are in column 1 and which blocks in column 2 etc.
How could I change this so that it can create a 'block' div for each user control returned from the database and put the user control in that block and in the right column?
[Code]....
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Jun 21, 2010
I am trying to dynamically load query form as a user control and build a sql statement based on user selection. I have a dropdownbox for Tablename, FieldName, ConditionalOperators and Value Field. Once the user makes a choice and causes a postback I loose my QueryForm (UserControl) and the selection Changed event never gets fired. I tried reloading the QueryForm on Page Init, still no luck.
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Nov 2, 2010
I have ASPX page named ArtifactReporting.aspx where I have 3 linkbuttons. For each button I have 3 different UserControls to be loaded dynamically. So I have written for each click
UserControl uc = (UserControl)this.LoadControl("<ASCX page name>");
divArtifact.Controls.Add(uc);
Now in one of the ASCX page I have a server side button. When I click on the button, the content of the ascx is going off, which is correct, because the page post back is happening and in Page_Load I have not written anything that will load the ASCX page.
how to go about this? I need if I load an usercontrol dynamically, I should be let the users carryout operation that usercontrol.
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