dynamically load a user control in the aspx page
Question
I have the following aspx page for eg: called choosemenu.aspx
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
</div>
<div id="renderhere" runat="server">render user control here </div>
</form>
</body>
</html>
I have a list of ascx pages called
english.ascx
commerce.ascx
maths.ascx
I have to dynamically load the ascx files in my aspx page depending on the querystring in the aspx page.
I have the following contents in my aspx page in page_load event.
var control = (English)Page.LoadControl("/ascx/english.ascx");
How will I render the contents of the english.ascx page in the choosemenu.aspx that too in this tag
Also I have to pass some value in the ascx file. This is the static stuff.
<Menu:MNU ID="english" runat="server" HiLiter="<%#h %>"></Menu:MNU>
2 answers
solution1
3 ACCPTED 2018-03-29 18:58:55
Loading a control from the server side
protected void Page_Load(object sender, EventArgs e)
{
Page.Controls.Add(Page.LoadControl("~/ascx/english.ascx")); //CHECK THE PATH
}
Loading a control from the server side and rendering it into a div If you want to render it in a specific div you might write:
protected void Page_Load(object sender, EventArgs e)
{
UserControl uc = (UserControl)Page.LoadControl("~/ascx/english.ascx");
uc.MyParameter = 1;
uc.Id = 2;
uc.someMethodToInitialize();
div1.Controls.Add(uc);
}
and in your aspx page:
<div id="div1" runat="server">
</div>
Loading a control from the server side initializing the control with parameters
If your control has a constructor with parameters , you have to use:
public English_Control(int MyParameter, int Id) { //code here.. }
In you aspx.cs file you can initialize with:
UserControl uc = (UserControl)Page.LoadControl(typeof(English_Control), new object[] {1, 2});
div1.Controls.Add(uc);
solution2
1 2018-03-29 19:15:34
In order for the control's postback values to be available, you must load and reload it no later than PreInit. Here is the code you need to do that.
protected override void OnPreInit(EventArgs e)
{
string controlToLoad = String.Empty;
//logic to determine which control to load
UserControl userControl = (UserControl)LoadControl(controlToLoad);
renderhere.Controls.Add(userControl);
base.OnPreInit(e);
}
As per MSDN :
Pre-Init event used to "Create or re-create dynamic controls."
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