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Item Type: NewsGroup Date Entered: 8/1/2004 8:31:37 PM Date Modified: Subscribers: 0 Subscribe Alert
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WhatThe12
Asp.Net User
IPostBackEventHandler and IPostBackDataHandler8/1/2004 8:31:37 PM

0/0

Hi,

If a control implements both IPostBackEventHandler and IPostBackDataHandler, will it ever raise a postback event?

I ask this because looking at the framework code using Reflector, it seems that when loading postback data, the framework checks to see if a control implements IPostBackDataHandler and if it does, it doesn't even atempt to see if the control also implements IPostBackEventHandler.
Web dev - spending forever achieving nothing.
joteke
Asp.Net User
Re: IPostBackEventHandler and IPostBackDataHandler8/2/2004 1:05:00 PM

0/0

Hi,

If control implements both interfaces, IPostBackDataHandler goes over by default. If you still want to raise with IPostBackEventHandler, you'd call Page.RegisterRequiresRaiseEvent (in IPostBackDataHandler implementation) to get the other one called (raised).
Thanks,

Teemu Keiski
Finland, EU
WhatThe12
Asp.Net User
Re: IPostBackEventHandler and IPostBackDataHandler8/2/2004 6:27:26 PM

0/0

Ok thanks. Do you know of a reason why both don't get automatically called?
Web dev - spending forever achieving nothing.
joteke
Asp.Net User
Re: IPostBackEventHandler and IPostBackDataHandler8/2/2004 6:51:34 PM

0/0

Well, you had digged the implementation. :-)

But I'd think that because basically IPostBackDataHandler.LoadPostData would be called on every postback whereas IPostBackEventHandler.RaisePostBackEvent would be called usually only when your control has itself caused the postback (is the one that actually should raise a postback event), so I guess there is no room for assumptions in the Framework but in this particular scenario it has been left up to the user to explicitly decide what to do.

I suppose they have wanted to keep it as general as possible and keep both interfaces separate because their usage is usually in different scenarios. You can raise events via IPostBackDataHandler too, I mean that it is technically just as possible (TextBox does it, like you know).
Thanks,

Teemu Keiski
Finland, EU
4 Items, 1 Pages 1 |< << Go >> >|


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Web:
Software/Technology Discussion : IPostBackDataHandler and ... IPostBackDataHandler and IPostBackEventHandler. I've been messing around with post back handler in ASP.NET today, and I found out a few points of interest. ...
Joteke's Blog : IPostBackDataHandler and IPostBackEventHandler in ... Sep 26, 2005 ... In ASP.NET 1.1 if your custom control implemented both IPostBackDataHandler and IPostBackEventHandler interfaces, it had to manually call ...
IPostBackEventHandler - microsoft.public.dotnet.framework.aspnet ... public class MyCustomControl : WebControl, IPostBackEventHandler, IPostBackDataHandler { ....... void IPostBackEventHandler. ...
CodeProject: Myth Regarding ViewState in ASP.NET. Free source code ... Sep 6, 2006 ... Re: Controls which are not inherited IPostBackDataHandler/ IPostBackEventHandler , member, GuenaVan, 1:22 16 Aug '05 ...
Safari Books Online - 0735615829 - Developing Microsoft ASP.NET ... You have to implement IPostBackEventHandler and/or IPostBackDataHandler only when your control needs to participate in the appropriate processing phase. ...
Anatomy of a Server Control (Part 3) On the server side, any controls that implement either the IPostBackDataHandler or IPostBackEventHandler interface (meaning that they process or handle ...
PostBackControl Class Implements the IPostBackEventHandler and IPostBackDataHandler interfaces. ... Implements IPostBackEventHandler, IPostBackDataHandler ...
ASP.NET ViewState and IpostBackEventHandler Interface Nov 13, 2005 ... The IPostBackEventHandler interface is for controls that raise events such ... IpostBackDataHandler. Anshu Bhatia replied at 14-Nov-05 09:59 ...
TreeView Class (System.Web.UI.WebControls) [ControlValuePropertyAttribute("SelectedValue")] public class TreeView : HierarchicalDataBoundControl, IPostBackEventHandler, IPostBackDataHandler, ...
LoadPostData and Page.RegisterRequiresPostBack(this) question ... or change IPostBackEventHandler to IPostBackDataHandler. Lostinet (Li Jian Dai) .NET MVP http://www.lostinet.com/ for LWTree/DatePicker ...




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