如何从代码后面调用回发？

Question

I am having an issue with my usercontrol being loaded too late in the "post back timeline", because they are being loaded in as a result of a custom event.

As a result the button click events on this usercontrol don't fire on the first click (the entire post-back occurs only the event-handlers for the click don't get raised). On the second click (and hence second post-back), however, the event-handlers work fine.

How can I invoke a second post-back automatically right after one has just finished? So my usercontrol gets loaded correctly.

Default Page

public interface IEventProvider
{
    void TriggerEvent(String path);
}


public partial class Default : System.Web.UI.Page, IEventProvider
{
    private string LastLoadedControl
    {
        get
        {
            return Session[Paths.CURRENTCTRL] as string;
        }
        set
        {
            Session[Paths.CURRENTCTRL] = value;
        }
    }

    private void LoadUserControl()
    {
        string controlPath = LastLoadedControl;

        ContentPlaceholder.Controls.Clear();

        if (string.IsNullOrEmpty(controlPath))
            controlPath = Utils.Paths.USERCTRL_BASE + "Main.ascx";

        Control uc = Page.LoadControl(controlPath);
        ContentPlaceholder.Controls.Add(uc);
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        LoadUserControl();
    }

    public void TriggerEvent(String path)
    {
        if (path.Equals("logout"))
        {
            Session.Clear();
            Session.Abandon();
            LastLoadedControl = null;
        }
        else LastLoadedControl = Paths.USERCTRL_BASE + path + ".ascx";
        LoadUserControl();
    }
}

Usercontrol code

protected void profileBtn_Click(object sender, EventArgs e)
    {
        Utils.Events.triggerRedirectPage(this.Page, "Login");
    }

events code

 public static void triggerRedirectPage(Page p, String path)
    {
        IEventProvider eventProvider = p as IEventProvider;
        if (eventProvider != null)
            eventProvider.TriggerEvent(path);
    }

Answer 1

您可以使用AllowPostBack=true添加按钮（或其他控件），然后在此按钮上触发单击事件。