You're welcome Shimon,
If there're anything else we can help later, please always feel free to
post here.
Thanks & Regards,
Steven Cheng
Microsoft Online Support
Get Secure!
www.microsoft.com/security
(This posting is provided "AS IS", with no warranties, and confers no
rights.)
--------------------
| From: "Shimon Sim" <
[email protected]>
| References: <
[email protected]>
<
[email protected]>
<
[email protected]>
<
[email protected]>
<
[email protected]>
<
[email protected]>
| Subject: Re: Custom Server Control Can't read design time property
| Date: Tue, 2 Aug 2005 08:23:02 -0400
| Lines: 374
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| X-MSMail-Priority: Normal
| X-Newsreader: Microsoft Outlook Express 6.00.2900.2670
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| Xref: TK2MSFTNGXA01.phx.gbl
microsoft.public.dotnet.framework.aspnet:115613
| X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet
|
| Thank you Steven
| Shimon.
| | > Thanks for your further followup Shimon,
| >
| > From the code you provided , you retrieve the url info from ViewState in
| > CreateChildControl method, as I've mentioend in the last reply, since
the
| > CreateChildControl will generally be called before the control's Loading
| > ViewState, so at that time the ViewState of the control is still
| > unavailable. For such scenario, the most common means is Retrieve the
| > viewstate info in some later events such as postback events or
Prerender
| > events (at that time ViewState has been successfully loaded) and we can
| > adjust the our sub controls' properteis through Viewstate at that time.
| >
| > In addition, from your control's "CreateChildControls" method code, it's
| > much more like a Render control rather than a composite control. For
such
| > control, I'll recommend that you change it to Render control, just put
the
| > control's output constructing task in the "Render" method (the
viewstate
| > is
| > surely available in it).
| >
| > Thanks,
| >
| > Steven Cheng
| > Microsoft Online Support
| >
| > Get Secure!
www.microsoft.com/security
| > (This posting is provided "AS IS", with no warranties, and confers no
| > rights.)
| >
| >
| >
| > --------------------
| > | From: "Shimon Sim" <
[email protected]>
| > | References: <
[email protected]>
| > <
[email protected]>
| > <
[email protected]>
| > <
[email protected]>
| > | Subject: Re: Custom Server Control Can't read design time property
| > | Date: Mon, 1 Aug 2005 08:21:28 -0400
| > | Lines: 292
| > | X-Priority: 3
| > | X-MSMail-Priority: Normal
| > | X-Newsreader: Microsoft Outlook Express 6.00.2900.2527
| > | X-RFC2646: Format=Flowed; Original
| > | X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527
| > | Message-ID: <
[email protected]>
| > | Newsgroups: microsoft.public.dotnet.framework.aspnet
| > | NNTP-Posting-Host: ool-44c05922.dyn.optonline.net 68.192.89.34
| > | Path: TK2MSFTNGXA01.phx.gbl!TK2MSFTNGP08.phx.gbl!TK2MSFTNGP10.phx.gbl
| > | Xref: TK2MSFTNGXA01.phx.gbl
| > microsoft.public.dotnet.framework.aspnet:115431
| > | X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet
| > |
| > | Thank you Steve on this.
| > | Here is the code
| > | Currently I implemented the property like this
| > | [Browsable(true)]
| > |
| > | [Category("Appearance")]
| > |
| > | [Editor(typeof(System.Web.UI.Design.ImageUrlEditor),
| > typeof(UITypeEditor))]
| > |
| > | [DefaultValue("")]
| > |
| > | public string MiddleImageUrl
| > |
| > | {
| > |
| > | get
| > |
| > | {
| > |
| > | if(ViewState["MiddleImageUrl"]!=null)
| > |
| > | return ViewState["MiddleImageUrl"].ToString();
| > |
| > | else
| > |
| > | return middleImageUrl;
| > |
| > | }
| > |
| > | set
| > |
| > | {
| > |
| > | ViewState["MiddleImageUrl"]=value;
| > |
| > | middleImageUrl=value;
| > |
| > | }
| > |
| > | }
| > |
| > |
| > |
| > | The method that uses it is like this.
| > |
| > | protected override void CreateChildControls()
| > |
| > | {
| > |
| > |
| > | Controls.Add(new LiteralControl("<table border =\"0\"
| > | cellspacing=\"0\"><tr><td>"));
| > |
| > | Controls.Add(leftImage);
| > |
| > |
| > | Controls.Add(new LiteralControl("</td><td width=\"100%\"
| > | background=\""+MiddleImageUrl+"\">"));
| > |
| > | lblTitle.Width=Unit.Parse("100%");
| > |
| > | Controls.Add(lblTitle);
| > |
| > | Controls.Add(new LiteralControl("</td><td>"));
| > |
| > | Controls.Add(rightImage);
| > |
| > |
| > |
| > | Controls.Add(new LiteralControl("</td></tr>"));
| > |
| > | Controls.Add(new LiteralControl("<tr><td colspan=3>"));
| > |
| > | pnlBody.Width=Unit.Parse("100%");
| > |
| > | double height=this.Height.Value-lblTitle.Height.Value;
| > |
| > | pnlBody.Height=Unit.Parse(height.ToString());
| > |
| > | Controls.Add(pnlBody);
| > |
| > | Controls.Add(new LiteralControl("</td></td></table>"));
| > |
| > | }
| > |
| > | What I get is: I set up this property via VS.NET during design time
| > |
| > | at design time I see the image but at run time I don't have any image
at
| > | all - the field in html is blank.
| > |
| > | Thank you very much for help.
| > |
| > | | > | > Hi Shimon,
| > | >
| > | > Thanks for your response. As you said that
| > | > " the problem is that I am trying to use it in CreateChildControls()
| > | > method
| > | > and then it not available"
| > | >
| > | > then, it still should be a runtime problem(not design-time). For
| > ASP.NET
| > | > Server Control, it'll pass through a certain sequence of events when
| > being
| > | > loaded into page on the serverside. And for composite control , the
| > | > CreateChildControl will be called at certain time by the asp.net
| > runtime.
| > | > Generally, the first time page is requested, since there is no
| > viewstate
| > | > yet, the composite control's "CreateChildControls" maybe called
after
| > | > Page_Load and before PreRender. And when in the page's PostBack
| > requests,
| > | > since the page/controls need to restore states from ViewState, the
| > | > composite control's "CreateChildControls" will be called before
| > loading
| > | > viewstate(dynamically created control will call LoadViewState after
| > being
| > | > added into parent collection).
| > | >
| > | > So, generally it's quite normal that we can't access the ViewState
in
| > | > CreateChildControl. Is there any particular requirement that you
need
| > to
| > | > access viewstate in CreateChildControls? Generally, for composite
| > | > control,
| > | > the "CreatecontrolControls" method should contains the code that
only
| > | > constructing the basic control hierarchy. For manipulate Properites
| > which
| > | > persisted in ViewState, it is recommended to be put in postback
event
| > (at
| > | > that time the viewstate has been successfully loaded).
| > | >
| > | > Please feel free to let me know if you have any particular problem
or
| > | > anything else unclear.
| > | >
| > | > Thanks & Regards,
| > | >
| > | > Steven Cheng
| > | > Microsoft Online Support
| > | >
| > | > Get Secure!
www.microsoft.com/security
| > | > (This posting is provided "AS IS", with no warranties, and confers
no
| > | > rights.)
| > | >
| > | >
| > | > --------------------
| > | > | From: "Shimon Sim" <
[email protected]>
| > | > | References: <
[email protected]>
| > | > <
[email protected]>
| > | > | Subject: Re: Custom Server Control Can't read design time property
| > | > | Date: Fri, 29 Jul 2005 08:09:13 -0400
| > | > | Lines: 122
| > | > | X-Priority: 3
| > | > | X-MSMail-Priority: Normal
| > | > | X-Newsreader: Microsoft Outlook Express 6.00.2900.2527
| > | > | X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527
| > | > | X-RFC2646: Format=Flowed; Original
| > | > | Message-ID: <
[email protected]>
| > | > | Newsgroups: microsoft.public.dotnet.framework.aspnet
| > | > | NNTP-Posting-Host: ool-44c05922.dyn.optonline.net 68.192.89.34
| > | > | Path:
| > TK2MSFTNGXA01.phx.gbl!TK2MSFTNGP08.phx.gbl!TK2MSFTNGP09.phx.gbl
| > | > | Xref: TK2MSFTNGXA01.phx.gbl
| > | > microsoft.public.dotnet.framework.aspnet:115128
| > | > | X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet
| > | > |
| > | > | Thanks Steven.
| > | > | I tried to use variable but it didn't work. I was thinking that
| > could
| > be
| > | > the
| > | > | problem is that I am trying to use it in CreateChildControls()
| > method
| > | > and
| > | > | then it not available. Can you confirm my guess.
| > | > | Thank you
| > | > | Shimon.
| > | > |
message
| > | > | | > | > | > Hi Shimon,
| > | > | >
| > | > | > Welcome to ASPNET newsgroup.
| > | > | > As for the Property of ASP.NET custom webserver control, they're
| > | > processed
| > | > | > differently between runtime and design-time. For those which
| > | > store/persist
| > | > | > the property in Viewstate, this only behave so at runtime where
| > there
| > | > is
| > | > | > ViewState collection exists in memory. For design-time, the
VS.NET
| > IDE
| > | > | > won't use the ViewState since there's no ASP.NET runtime
exists.
| > In
| > | > | > design-time, all the value we set for the property in IDE will
be
| > | > | > persisted
| > | > | > in the page template (aspx) according to our control's
| > declaration.
| > | > The
| > | > | > "System.Web.UI.PersistenceModeAttribute" attribute is just to
help
| > | > define
| > | > | > how to persist the control's property value at design-time, for
| > | > example:
| > | > | >
| > | > | > [PersistenceMode(PersistenceMode.Attribute),
| > | > | > public string Text
| > | > | > {
| > | > | > get ... set....
| > | > | > }
| > | > | >
| > | > | > indicate the "Text" property's value will be persisted as an
| > attribute
| > | > in
| > | > | > the Control's tag at design-time. This will result in the below
| > conent
| > | > in
| > | > | > aspx page when we using the control:
| > | > | >
| > | > | > <prefix:ControlName id=xxxx Text="xxxx' ...../>
| > | > | >
| > | > | > Hope helps. Thanks,
| > | > | >
| > | > | > Steven Cheng
| > | > | > Microsoft Online Support
| > | > | >
| > | > | > Get Secure!
www.microsoft.com/security
| > | > | > (This posting is provided "AS IS", with no warranties, and
confers
| > no
| > | > | > rights.)
| > | > | >
| > | > | >
| > | > | >
| > | > | >
| > | > | >
| > | > | >
| > | > | >
| > | > | >
| > | > | > --------------------
| > | > | > | From: "Shimon Sim" <
[email protected]>
| > | > | > | Subject: Custom Server Control Can't read design time property
| > | > | > | Date: Thu, 28 Jul 2005 21:25:13 -0400
| > | > | > | Lines: 48
| > | > | > | X-Priority: 3
| > | > | > | X-MSMail-Priority: Normal
| > | > | > | X-Newsreader: Microsoft Outlook Express 6.00.2900.2527
| > | > | > | X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527
| > | > | > | X-RFC2646: Format=Flowed; Original
| > | > | > | Message-ID: <
[email protected]>
| > | > | > | Newsgroups: microsoft.public.dotnet.framework.aspnet
| > | > | > | NNTP-Posting-Host: ool-44c05922.dyn.optonline.net 68.192.89.34
| > | > | > | Path:
| > | > TK2MSFTNGXA01.phx.gbl!TK2MSFTNGP08.phx.gbl!TK2MSFTNGP09.phx.gbl
| > | > | > | Xref: TK2MSFTNGXA01.phx.gbl
| > | > | > microsoft.public.dotnet.framework.aspnet:115073
| > | > | > | X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet
| > | > | > |
| > | > | > | I have a custom composite control
| > | > | > | I have following property
| > | > | > |
| > | > | > | [Browsable(true)]
| > | > | > |
| > | > | > | [Category("Appearance")]
| > | > | > |
| > | > | > | [Editor(typeof(System.Web.UI.Design.ImageUrlEditor),
| > | > | > typeof(UITypeEditor))]
| > | > | > |
| > | > | > | [DefaultValue("")]
| > | > | > |
| > | > | > | public string MiddleImageUrl
| > | > | > |
| > | > | > | {
| > | > | > |
| > | > | > | get
| > | > | > |
| > | > | > | {
| > | > | > |
| > | > | > | if(ViewState["MiddleImageUrl"]!=null)
| > | > | > |
| > | > | > | return ViewState["MiddleImageUrl"].ToString();
| > | > | > |
| > | > | > | else
| > | > | > |
| > | > | > | return null
| > | > | > |
| > | > | > | }
| > | > | > |
| > | > | > | set
| > | > | > |
| > | > | > | {
| > | > | > |
| > | > | > | ViewState["MiddleImageUrl"]=value;
| > | > | > |
| > | > | > | }
| > | > | > |
| > | > | > | }
| > | > | > |
| > | > | > | For some reason if I set up it up during design time it
always
| > "".
| > | > | > |
| > | > | > | I can't get why and what should I do to make it work.
| > | > | > |
| > | > | > | Thanks you
| > | > | > |
| > | > | > | Shimon.
| > | > | > |
| > | > | > |
| > | > | > |
| > | > | >
| > | > |
| > | > |
| > | > |
| > | >
| > |
| > |
| > |
| >
|
|
|
