Hello,

I get a NotSupportedException when using the following code snippet in the
constructor of my ImageButton control:

System.Drawing.Graphics gfx = this.CreateGraphics();
SizeF textSizeF = gfx.MeasureString(this.Text, this.Font);
this.m_TextSize = new Size((int)Math.Floor(textSizeF.Width),
(int)Math.Floor(textSizeF.Height));
gfx.Dispose();

To be exact, the exception is thrown by the first line. Could anyone explain
why CreateGraphics() doesn't work here ?

Christian

Not sure what "this" is in the context of your code, but ti's likely not an
object that supports CreateGraphics. I think the only items that support
CreateGraphics are Control, Panel, Form and PictureBox.


--
Chris Tacke, eMVP
Advisory Board Member
www.OpenNETCF.org
---
Windows CE Product Manager
Applied Data Systems
www.applieddata.net

"Christian Schwarz" <(E-Mail Removed)> wrote in message
news:bk9tp7$qtokm$(E-Mail Removed)...
> Hello,
>
> I get a NotSupportedException when using the following code snippet in the
> constructor of my ImageButton control:
>
> System.Drawing.Graphics gfx = this.CreateGraphics();
> SizeF textSizeF = gfx.MeasureString(this.Text, this.Font);
> this.m_TextSize = new Size((int)Math.Floor(textSizeF.Width),
> (int)Math.Floor(textSizeF.Height));
> gfx.Dispose();
>
> To be exact, the exception is thrown by the first line. Could anyone
explain
> why CreateGraphics() doesn't work here ?
>
> Christian
>
>

Hello Christian,

The CreateGraphics() is supported only for the Control and Form classes.
Calling this method for any other classes will throw NotSupportedException.

Thank you,
Sergiy.

This posting is provided "AS IS" with no warranties, and confers no rights.

--------------------
| From: "Christian Schwarz" <(E-Mail Removed)>
| Newsgroups: microsoft.public.dotnet.framework.compactframework
| Subject: CreateGraphics() throws NotSupportedException
| Date: Wed, 17 Sep 2003 17:15:33 +0200
| Lines: 17
| Message-ID: <bk9tp7$qtokm$(E-Mail Removed)>
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microsoft.public.dotnet.framework.compactframework:33755
| X-Tomcat-NG: microsoft.public.dotnet.framework.compactframework
|
| Hello,
|
| I get a NotSupportedException when using the following code snippet in the
| constructor of my ImageButton control:
|
| System.Drawing.Graphics gfx = this.CreateGraphics();
| SizeF textSizeF = gfx.MeasureString(this.Text, this.Font);
| this.m_TextSize = new Size((int)Math.Floor(textSizeF.Width),
| (int)Math.Floor(textSizeF.Height));
| gfx.Dispose();
|
| To be exact, the exception is thrown by the first line. Could anyone
explain
| why CreateGraphics() doesn't work here ?
|
| Christian
|
|
|

Thank you for the answers.

My ImageButton's base class is System.Windows.Forms.Button, which you say
doesn't support CreateGraphics() method. What can I do, if I need the
CreateGraphics() method in order to measure a string's size ? Creating a
dummy control to use it's CreateGraphics() method ?

Christian

You can inherit your custom button from the Control class. Then you will be
able to call the CreateGraphics() method.

Hope this helps,
Sergiy.

This posting is provided "AS IS" with no warranties, and confers no rights.

--------------------
| From: "Christian Schwarz" <(E-Mail Removed)>
| Newsgroups: microsoft.public.dotnet.framework.compactframework
| Subject: Re: CreateGraphics() throws NotSupportedException
| Date: Thu, 18 Sep 2003 08:25:52 +0200
| Lines: 10
| Message-ID: <bkbj0r$r70bj$(E-Mail Removed)>
| References: <bk9tp7$qtokm$(E-Mail Removed)>
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[57495])
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8.phx.gbl!newsfeed00.sul.t-online.de!newsfeed01.sul.t-online.de!t-online.de!
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microsoft.public.dotnet.framework.compactframework:33818
| X-Tomcat-NG: microsoft.public.dotnet.framework.compactframework
|
| Thank you for the answers.
|
| My ImageButton's base class is System.Windows.Forms.Button, which you say
| doesn't support CreateGraphics() method. What can I do, if I need the
| CreateGraphics() method in order to measure a string's size ? Creating a
| dummy control to use it's CreateGraphics() method ?
|
| Christian
|
|
|

Call CreateGraphics on Button's parent form:

Form frm = myButton.TopLevelControl as Form;
if ( frm != null )
{
Graphics g = frm.CreateGraphics();
g.MeasureString(myButton.Text, myButton.Font);
}

"Christian Schwarz" <(E-Mail Removed)> wrote in message
news:bkbj0r$r70bj$(E-Mail Removed)...
> Thank you for the answers.
>
> My ImageButton's base class is System.Windows.Forms.Button, which you say
> doesn't support CreateGraphics() method. What can I do, if I need the
> CreateGraphics() method in order to measure a string's size ? Creating a
> dummy control to use it's CreateGraphics() method ?
>
> Christian
>
>