Pass variables and access methods of User Control from CodeBehind

Question

So I have a function renderWidget() in default.aspx.cs . The idea of this is to add a User Control to a page.

public void renderWidget(string data) {
    Control ctrl = Page.LoadControl("/widgets/widget.ascx");
    dataPanel.Controls.Add(ctrl);
}

This all works fine, lovely jubbly. Now in the other end, at the User Control, I have the following code in widget.ascx.cs :

public class WidgetControl : System.Web.UI.UserControl
{
    public string testString = "";
    public void test() {
        Response.Write("test");
    }

}

The problem arises when I try to access either of the properties in the User Control. When I try to add ctrl.test() or ctrl.testString = "test" to default.aspx.cs, I get the error "'System.Web.UI.Control' does not contain a definition for 'test'". I feel like there's probably something very basic I'm missing here.

Any help appreciated, thanks!

Answer 1

您需要将实例转换为WidgetControl 。

Answer 2

You have to cast to the correct type:

WidgetControl widget = (WidgetControl)ctrl;
widget.testString = "Foo";
widget.test();

LoadControl returns Control and not the actual type of your UserControl .