Programmatically Adding A User Control In C#?
Jan 12, 2010
I have a user control that needs to load a child control when a button is clicked. The trouble is that it has to request the control from another class.
So in the button click event, I call the function to get me my control, and add it to the page, like this:
UserControl ctrl = ExampleDataProvider.GetControl(some params...);
myDetailPane.Controls.Add(ctrl);
The GetControl method looks like:
public static UserControl GetControl(some params...)
{
ExampleDetailPane ctrl = new ExampleDetailPane();
ctrl.Value = "12";
ctrl.Comment = string.Empty;
return ctrl;
}
This isn't working due to the page's lifecycle - the Page_Load of the child control gets fired and its controls are null.
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Mar 25, 2011
I am trying to add a user control into a div at runtime. I can add the control no probelem but it overwrites the previous control added.Basically, I am trying to add passengers to a travel system - the passenger details are in the user control and I don't know in advance how many there will be. I have an add new passenger button which should append the new user control into the div without overwriting the previous passenger. The code is c#/.net 4. I have tried to save the control data into viewstate and re add it with the new one but that also doesn't work. Here is a snippet of the code I'm using
foreach (Control uc in p_passengers.Controls) {
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}
however, p.SaveAs() (just writes the control values into ViewState) is never hit.
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May 8, 2010
I am developing a custom Web Interface Browser for Subversion Repositories with C#/ASP.NET and SVNKit (Converted to .NET assemblies using IKVM.NET). Is there any clean way to locally add a new subversion user (that is added by the administrator) using C# code?
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Jan 8, 2010
I have the following code in Page_Init (actually in a function called by Page_Init in response to a __doPostBack call)
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May 21, 2010
I am stuck in chart controls...Here is my prob... There is a ListBox containing some items...when user selects multiple items from the list box I want to generate a dynamic table with the number of columns same as that of the number items selected in the listbox. And for each selected item I want to show a seperate chart in the columns...Currently I want the same chart control for every selected item (i.e. a static hard coded chart that i will replace later by dynamic values)....I am using a method that draws a chart control using a sample dataset... I am calling it each time when a new column is created..Also the DrawChart method executes for the first column only and throws an index out of range exception! after the first execution...my code is not working...here
my code...
[Code]....
[Code]....
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Nov 30, 2010
I'm trying to programmatically add a user control to an aspx page.
the problem is that any postback that happens on the page(even if i added the user control to an updatepanel) clears the user control from the page.
this happens also if the postback is generated from the user control itself.
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Mar 4, 2011
Is this possible and how?
I would like a single button that will fire a loading of a user control into a panel to simulate a wizard-type functionality.
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Jul 13, 2010
I'm trying to cache user controls and on some pages i want to cache single objects. There are multiple ways of implementing caching, and my head is breaking over it.
The way I see the caching options now:
You have the PartialCaching option which is set to cache the control for 30 minutes, and after that it clears itself... You have the varyByParam to identity the page by its querystring paramaters... or other vary options
But i just cant find an appropriate way to add caching to a control, and be able to clear the caching programmatically when i update one of the objects used in the control from the backend.
You can do HttpContext.Current.Cache.Insert(), which accepts a key on which you can destroy the caching item later by using remove... This can save objects in cache but can you use options like varyByParam?
My questions are burnt down to two:
Is there a way to clear the caching on specific user controls from the code? If yes, can this be done according to the varyby options? How would the object caching respond to logged in users or anonymous users using Insert()?
EDIT: I'm caching multiple things.... And I'm really flabbergasted in which choice to make referring to caching. Can the Cache.Insert be varied by Parameters?
The main problem is peopling editing things from the backend, which needs to trigger an event that reinstantiates or clears all caching items referring that object.
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Feb 11, 2010
I'm loading a user control programatically like this:
[code].....
The problem I have is that all the controls in my user controls are null, is there something else I have to do to load the child controls?
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Feb 12, 2011
I have an asp.net usercontrol which represents a "popup" dialog. Basically, it's a wrapper for the jQuery UI dialog which can be subclassed to easily make dialogs.
As part of this control, I need to inject a div into the page the control is used on, either at the very top or very bottom of the form so that when the popup is instantiated, it's parent is changed to this div. This allows "nested" popups without the child popup being trapped inside the parent popup. The trouble is, I can't find a safe way to inject this div into the page. A usercontrol doesn't have a preinit event, so I can't do it there, and calling Page.Form.Controls.Add(...) in Init, Load or PreRender causes the standard exception "The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases."
I thought I had found a solution by using...
ScriptManager.RegisterClientScriptBlock(Page, Me.GetType, UniqueID + "_Dialog_Div", containerDiv, False)
... which seemed to work well normally, but recently a coworker tried putting an UpdatePanel inside the dialog and now she's getting the error "The script tag registered for type 'ASP.controls_order_viewzips_ascx' and key 'ctl00$ContentBody$OViewZips_Dialog_Div' has invalid characters outside of the script tags: . Only properly formatted script tags can be registered."
How are you supposed to add controls to the pages control collection from inside a user control?
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Mar 11, 2010
I've got an existing asp.net project written in vb.net. Another person has written a user control in c#.
the steps for adding that C# user control to the vb.net app?
I've tried copying them to the folder and using "Add existing item", however it doesn't compile the code behind at all.
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Nov 3, 2010
I have a usercontrol (ascx) that I want to dynamically add to a page.
Neither the control nor the page has a namespace (thanks crappy vendor).
When I use the following, it tells me it cant find the "type or namespace"
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'System.Web.UI.UserControl' does not contain a definition for 'StayTunedID'
I was hoping that casting StayTunedControl as type (UserControler_StayTuned) would fix this.
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Sep 22, 2010
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Aug 28, 2010
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The control itself is simple and looks like this:
<%@ Control Language="VB" AutoEventWireup="false" CodeFile="item-lector.ascx.vb" Inherits="includes_usercontrols_item_selector" %>
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<%=Me.Output%>
</div>
The code behind file dynamically fills the control's "output" property so the final markup appears as follows:
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<li><a href="#">Item 3</a></li>
<li><a href="#">Item 4</a></li>
<li><a href="#">Item 5</a></li>
<li><a href="#">Item 6</a></li>
<li><a href="#">Item 7</a></li>
<li><a href="#">Item 8</a></li>
<li><a href="#">Item 9</a></li>
<li><a href="#">Item 10</a></li>
</ul>
</div>
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What I am trying to do is add click events to the list items. When the user clicks on one of the items in the list, I want to capture which item the user selects in the list (does this require a postback?) and do something with it in the code behind (< this is key).
I am more of a middle tier and db tier developer and UI development is not my strength so please consider me a newbie in that regard. I am not sure how to proceed or what to inject into the output string to enable this.
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to add a user control to a web form in Visual Studio 2008, but to not have its declaration added to the designer file?
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Jul 21, 2010
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Apr 26, 2010
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May 31, 2010
I want to add StyleSheets programmatically in the head section but one of the examples I saw seemed to need to many lines of code to add just one style sheet even though I may need a lot: Example Code:
HtmlLink css = new HtmlLink();
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foreach (Literal item in cssFiles)
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this.Header.Controls.Add(item);
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}
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Jun 30, 2010
What I would like to achieve:
I would like a user to be able in insert a row into the listview. BUT not into a database.
What I am stuck on:
Currently I am stuck on the OnItemCommand, i dont seem to be entering the method. Code below.
[Code]....
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Jun 14, 2010
I'm dynamically creating image buttons and want their click event to update an image in the update panel where only the panel updates- not the whole page.
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Here's my code:
[Code]....
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Aug 20, 2010
I have a problem with adding programatically FilteredTextBoxExtender (i put the code below).
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[Code]....
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Nov 25, 2010
recently i created a table programatically using c#.
now i want to format the table.
i want to give colors to the alternative rows of the table.
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TableRow tr=new
TableRow();
TableCell tc = new
TableCell();
tc.Controls.Add(new
LiteralControl("...."));
tr.Cells.Add(tc);
DriverTable.Rows.Add(tr);
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Apr 20, 2010
I need to do the following:
[Code]....
I've tried looking for examples but can only find something setting properties for animation. Is it actually possible?
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