Re: UserControl event & method call sequence

You might also find this helpful:

It is very important to understand the ASP.NET page life cycle. If you have
a usercontrol on an aspx page, following are the order of events.

1) User control Page_Init fires first
2) Page's Page_Init fires
3) Page's Page_Load fires
4) User control's Page_Load fires
5) Page's Prerender event
6) User control's Prerender event

You can test this by putting breakpoints for each events.


"James Identity" wrote:

> The host aspx file is very dynamic. It does not always use this user control
> after
> the page has been posted back. If the aspx file is posted back then the user
> control
> will show as being posted back even if it is just loaded for the first time.
>
> When the user control is loaded for the first time I set the data record:
> SetDataRecord(myRecord);//
> Then I call a method to bind the page from the record.
>
> When the page is posted back I set the data record:
> SetDataRecord(myRecord);//
> Then I call a function to bind the record from the page. So I get any
> changes to the
> user control form to update the record.
>
> Then I remove the user control from the aspx file and load it again and set
> a new record
> to bind the data.
>
> When the page first loads it calls Load then SetDataRecord() is called then
> BindPage();
> >> Control c1 = LoadControl("UserControl1.ascx");
> >> PlaceHolderControl.Controls.Add(c1);
> >> UserControl1 myControl = (UserControl1) c1;
> >> myControl.Id = "myControl";
> >> myControl.SetDataRecord(myRecord);//Record that contains data needed by
> >> the
> myControl.BindPage();
>
> When the page is posted back with the user control it changes seqence.
>
> >> Control c1 = LoadControl("UserControl1.ascx");
> >> PlaceHolderControl.Controls.Add(c1);
> >> UserControl1 myControl = (UserControl1) c1;
> >> myControl.Id = "myControl";
> >> myControl.SetDataRecord(myRecord);//Record that contains data needed by
> >> the
> myControl.BindRecordFromPage();
>
> It is called like this:
> <p>SetDataRecord Called</p>
> <p>BindRecordFromPage Called</p>
> <p>User Control Load Method</p>
>
> You can see how this causes a problem.
>
>
> "Curt_C [MVP]" <software_at_darkfalz.com> wrote in message
> news:E814875A-E78A-41E0-BBB0-637628718EF1@xxxxxxxxxxxxxxxx
> > Have you tried wrapping the IsPostBack() check to ensure you aren't
> > rebinding
> > when un-needed?
> >
> > --
> > Curt Christianson
> > site: http://www.darkfalz.com
> > blog: http://blog.darkfalz.com
> >
> >
> >
> > "James Identity" wrote:
> >
> >> I have an aspx page that loads an ascx user control.
> >>
> >> This is what happens:
> >> 1. As the aspx page loads it then loads the ascx usercontrol.
> >> 2. After loading the user control the aspx page calls a method in the
> >> user
> >> control
> >>
> >> Control c1 = LoadControl("UserControl1.ascx");
> >> PlaceHolderControl.Controls.Add(c1);
> >> UserControl1 myControl = (UserControl1) c1;
> >> myControl.Id = "myControl";
> >> myControl.SetDataRecord(myRecord);//Record that contains data needed by
> >> the
> >> control.
> >>
> >> When the control first loads it is ok because the Load method of the user
> >> control is
> >> called and then the SetDataRecord(MyRecord myRecord) is called.
> >>
> >> When the page is posted back there is a problem.
> >> The SetDataRecord is called first and then the Load method of the user
> >> control is called.
> >> This is causing a problem.
> >>
> >> I need the control to load in a consistent way so that I can program it.
> >> I need the control to load first every time and then I need to set the
> >> data
> >> record and then there are more functions in the PreRender event.
> >>
> >> On postback, the difference is that there is ViewState data.
> >> How does the method get called on the control after it loads
> >> and how does the method get called before it loads. How do I make this
> >> consistant.
> >>
> >> Also.
> >> What determines when the user control life cycle evens are called and how
> >> does that synchronize to the life cycle events to the aspx page that
> >> loads
> >> the control ?
> >>
> >> Thanks for any advice.
> >> James
> >>
> >>
> >>
> >>
> >>
> >>
>
>
>
.

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