Load user control dynamically with parameters

Question

I've created a user control.

public partial class Controls_pageGeneral : System.Web.UI.UserControl
{

    private int pageId;
    private int itemIndex;

    public int PageId
    {
        get { return pageId; }
        set { pageId = value; }
    }

    public int ItemIndex
    {
        get { return itemIndex; }
        set { itemIndex = value; }
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        // something very cool happens here, according to the values of pageId and itemIndex
    }

}

Now I want to dynamically create this control and pass it parameters. I've tried using the LoadControl function but it only has two constructor: one with string (path), and another with Type t and array of parameters.

The first method works, but because of my parameters and have to use the more complicated method of LoadControl, but I don't get how to use it. How can I case my path string of my Control to that weird object Type t?

user447356 · Accepted Answer · 2011-12-04 15:35:58Z

17

In your case it's not relevant, as the second method accepts parameters passed to proper constructor, but you don't have constructor at all to your control.

Just load the control using the path of the .ascx file, cast to proper type and set the properties one by one:

Controls_pageGeneral myControl = (Controls_pageGeneral)Page.LoadControl("path here");
myControl.PageId = 1;
myControl.ItemIndex = 2;

If you insist on using constructor, first add such:

public Controls_pageGeneral(int pageId, int itemIndex)
{
    //code here..
}

And then:

Page.LoadControl(typeof(Controls_pageGeneral), new object[] {1, 2});

Will do the same as the above as the runtime code will look for constructor accepting two integers and use it.

answered Dec 4, 2011 at 15:35

user447356

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5 Comments

SRachamim Over a year ago

which namespace do I need to use? I'm afraid my Controls_pageGeneral is unknown to the page.

user447356 Over a year ago

It's your class.. if it's in different web application you can't do that, otherwise just add it to your own application.

user447356 Over a year ago

web.config can't define controls as far as I know.. where does the code behind sit?

SRachamim Over a year ago

it's in a folder in my application, when all my user controls are. but none of them are "living" on other code-behind files, though i can use them on my aspx files any where (cause I've registered them in the web.config).

user447356 Over a year ago

If your page class got namespace, just add the same namespace to the code you posted in your question: wrap the Controls_pageGeneral class with the same namespace same way the page class is wrapped.

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