如何从用户控件更改MasterPage中的控件值？

Question

I want to change control value exists in Master page from user control and the scenario is like this:
On user control load method I use a query string parameter called "catID" to get category entity, then I want to set the category title as value of title tag (Category title) ,which locate in Master page .
I tried to change the title in user control page load control but the Master page load method executes earlier.

Any ideas ?

Answer 1

Provide a public method in your MasterPage that sets the title, for example:

public void setTitle(string title)
{
    this.LblTitle.Text = title;
}

Then you can call it from your UserControl( YourMasterPage is the actual type of the MasterPage):

((YourMasterPage)this.Page.Master).setTitle("new Title");

Answer 2

If it's a query string parameter you should be able to read "catId" ie from Masterpage code behind as well and set the title.

EDIT:

Try a property then: In usercontrol

protected void Page_Load(object sender, EventArgs e)
{
    this.MyTitle = "SomeTitle";
}
public string MyTitle { get; set; }

On masterpage:

protected void Page_Load(object sender, EventArgs e)
{
    WebUserControl.PreRender += new EventHandler(WebUserControl_PreRender);
}

void WebUserControl_PreRender(object sender, EventArgs e)
{
    string str = WebUserControl.MyTitle;
    this.Header.Title = str;
}

Answer 3

 ((Label)Master.FindControl("loadlbl")).Text = "your text";