Date parsed: 08/10/2007 13:04:32
Date: Mon, 08 Oct 2007 13:04:32 GMT
Hi Dmitry,
Sorry for keep you waiting.
After some further research, I got the cause of the problem. It is actually
caused by the "Color.FromName" function you used. In your original code,
you use it as below:
System.Drawing.Color.FromName("#FFFF80")
this is actually an incorrect and unsupported usage. Refer to the document
below:
#Color.FromName Method
http://msdn2.microsoft.com/en-us/library/system.drawing.color.fromname.aspx>>>>>>picked from the doc>>>>>
Parameters
name
A string that is the name of a predefined color. Valid names are the same
as the names of the elements of the KnownColor enumeration.
<<<<<<<<<<<<<
Therefore, if you use the "#XXXXXX" like color, it will cause the problem
when serializing the viewstate. The color is unknown to the serializer and
it store the blank color into the view state(that's why you see the color
lost on postback). One quick resolution here(if you do need to specify the
"#xxxxxx" like html color instead of a known color name or RGB value, you
can use the ColorTranslator.FromHtml() method instead. e.g.
==================
<asp:Label ID="Label1" runat="server" Text="Label"
BackColor='<%#
TestBool.ToString()=="True"?System.Drawing.ColorTranslator.FromHtml("#FFFF80
") ystem.Drawing.Color.White %>' ........./>
==================
I've tested it and it works. Hope this helps.
Sincerely,
Steven Cheng
Microsoft MSDN Online Support Lead
This posting is provided "AS IS" with no warranties, and confers no rights.
>From: "Dmitry Duginov" <dima@nospam.nospam>
>Subject: Re: BackColor binding does not work on postback
>Date: Thu, 4 Oct 2007 19:56:54 -0400
>
>
>"Steven Cheng[MSFT]" <stcheng@online.microsoft.com> wrote in message
>news:ep9%2388iBIHA.6080@TK2MSFTNGHUB02.phx.gbl...
>> Thanks for your followup Dmitry,
>>
>> I'm still contacting some other ASP.NET engineers on this issue so as to
>> definitely confirm this issue.
>>
>> For workarounds, currently what I have got is a possible means through
>> programmrtically update the TextBox's Color property through "PreRender"
>> event. The "PreRender" event is the latest event before the control being
>> rendered. Therefore, you can register this event for the textbox and
>> detect
>> its value(through Text property) and programmaticlaly set its
BackColor(or
>> other decorate properties...) at that time. e.g.
>
>Sorry, Steven, but
>
>- the issue is with the Label control, not a textbox
>- highlighting has nothing to do with the value of its Text property, it
is
>bound to the property of a business object
>
>Regards,
>Dmitry
>
>> ==============
>> protected void TextBox1_PreRender(object sender, EventArgs e)
>> {
>> TextBox txt = sender as TextBox;
>>
>> if (txt.Text == ".....")
>> {
>> txt.BackColor = Color.Yellow;
>> }
>> else
>> {
>> txt.BackColor = Color.Maroon;
>> }
>> }
>> ==============
>>
>> In addition, by some futher testing, in some C# web site projects, I
found
>> the problem is not always reproable. Therefore, I also suggest you to
test
>> it in different projects and pages(you can use TextBox on page's top
level
>> or inside a FormView). It would be helpful that if you can give me a
>> definite steps that can constantly repro the behavior.
>>
>> Sincerely,
>>
>> Steven Cheng
>>
>> Microsoft MSDN Online Support Lead
>>
>>
>> This posting is provided "AS IS" with no warranties, and confers no
>> rights.
>>
>> --------------------
>>>From: "Dmitry Duginov" <dima@nospam.nospam>
>>>References: <#oi4GldAIHA.4612@TK2MSFTNGP03.phx.gbl>
>> <WEiMsY9AIHA.240@TK2MSFTNGHUB02.phx.gbl>
>>>Subject: Re: BackColor binding does not work on postback
>>>Date: Wed, 3 Oct 2007 16:42:26 -0400
>>>
>>>
>>>Hi, Steven!
>>>
>>>Anything new? Workarounds, suggestions?
>>>
>>>Dmitry
>>>
>>>"Steven Cheng[MSFT]" <stcheng@online.microsoft.com> wrote in message
>>>news:WEiMsY9AIHA.240@TK2MSFTNGHUB02.phx.gbl...
>>>
>>>> The problem is not specific to FormView but seems a binding issue of
the
>>>> Label control. I can get this behavior even through the following
simple
>>>...
>>>> Currently I'll do some further research on this and will update you if
>>>> there is any new finding or information.
>>>>
>>>>
>>>> This posting is provided "AS IS" with no warranties, and confers no
>>>> rights.
>>>>
>>>> --------------------
>>>>>From: "Dmitry Duginov" <dima@nospam.nospam>
>>>>>Subject: BackColor binding does not work on postback
>>>>>Date: Fri, 28 Sep 2007 10:10:07 -0400
>>>>
>>>>>
>>>>>Hi,
>>>>>
>>>>>I have the following label markup (label is inside FormView):
>>>>>
>>>>><asp:Label
>>>>> ID="lblIndicatorReady" runat="server" Text="RE" ToolTip="Ready"
>>>>> BackColor='<%#
>>>>>Eval("Ready").ToString()=="True"?System.Drawing.Color.FromName("#FFFF80
")
>> :S
>>>> ystem.Drawing.Color.White
>>>>>%>'
>>>>> Enabled='<%# Eval("Ready") %>'
>>>>> Font-Bold='<%# Eval("Ready") %>'>
>>>>></asp:Label>
>>>>>
>>>>>I.e. late binding for the "Ready" property used to determine should the
>>>>>label be
>>>>>(bold, highighted and enabled) or (plain, white background, disabled)
>>>>>
>>>>>On initial load everything works as expected (for ready items label is
>>>>>colored). But on postbacks BackColor is always white for some reason.
>>>>>Enabled and Bold properties are shown correctly though.
>>>>>
>>>>>Any ideas?
>>>>>
>>>>>Dmitry.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>
>>>
>>>
>>
>
>
>
