Finding events to be processed in ASP.NET

问题

On PostBack, from clicking on an ImageButton, it first hits

protected void Page_Load(object sender, EventArgs e)

Then it hits

protected void ImageButton_Click(object sender, EventArgs e)

My problem is that in my Page_Load it refreshes a ListBox before the selected items can be processed by ImageButton_Click.

Is there a way to tell what events are yet to be processed, so I can handle them?

回答1:

Populate/databind your ListBox within Page_Load only on the first load, not after postback. Viewstate will maintain the items in your ListBox subsequently.

protected void Page_Load(object sender, EventArgs e) {

    if(!IsPostBack) //if not postback
    {
       //populate your listbox
    }

}

Here's a good read on the Page's Lifecycle, you'll understand the sequence/order of page/child-controls' events and their purposes.

http://msdn.microsoft.com/en-us/library/ms178472.aspx

来源：https://stackoverflow.com/questions/1647307/finding-events-to-be-processed-in-asp-net