473,718 Members | 2,016 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

How to prevent code from being executed by the Designer?

How can I prevent a few lines of code contained in the constructor of a Form
from being executed by the Designer?

Thanks,
Fabio
Dec 28 '05 #1
7 8819
Fabio,

Check the DesignMode property of the control that you have. If it
returns true, then you are in design mode.

This is inherited from Component.

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"Fabio Cannizzo" <fc************ *****@london.ed u> wrote in message
news:43******** **************@ reader3.news.ti n.it...
How can I prevent a few lines of code contained in the constructor of a
Form from being executed by the Designer?

Thanks,
Fabio

Dec 28 '05 #2
Fabio,

When developing user controls or custom controls, I SOMETIMES use
this.DesignMode to prevent things from being created.

Why do you need it for a form?

Dave

"Fabio Cannizzo" <fc************ *****@london.ed u> wrote in message
news:43******** **************@ reader3.news.ti n.it...
How can I prevent a few lines of code contained in the constructor of a
Form from being executed by the Designer?

Thanks,
Fabio

Dec 28 '05 #3
"Fabio Cannizzo" <fc************ *****@london.ed u> wrote in
news:43******** **************@ reader3.news.ti n.it:
How can I prevent a few lines of code contained in the constructor of
a Form from being executed by the Designer?


Check the DesignMode property of the form.

if (!this.DesignMo de)
{
// Code here only executes when running, not in design mode
}

-mdb
Dec 28 '05 #4
Thanks to all of you guys.

In reality I need this in an object inherited from UserControl, not from
Form.

The constructor of my UserControl will create some unmanaged objects using
interops, and I suspect this is what is causing lots of problems with my VS.
See my other post just two hours ago: "Bad UserControl in toolbox".

Regards,
Fabio
"D. Yates" <fo****@hotmail .com> wrote in message
news:eH******** ********@TK2MSF TNGP09.phx.gbl. ..
Fabio,

When developing user controls or custom controls, I SOMETIMES use
this.DesignMode to prevent things from being created.

Why do you need it for a form?

Dave

"Fabio Cannizzo" <fc************ *****@london.ed u> wrote in message
news:43******** **************@ reader3.news.ti n.it...
How can I prevent a few lines of code contained in the constructor of a
Form from being executed by the Designer?

Thanks,
Fabio


Dec 28 '05 #5
Since you are doing this work in a UserControl, you might find that you need
to move some of the code out of the constructor to get the DesignMode
property to function correctly:

http://groups.google.com/groups?as_q...e+gone+in+.Net
http://groups.google.c om/groups?as_q=Des ign+Mode+-+My+Constructor +keeps+running+ in+design!
"Fabio Cannizzo" <fc************ *****@london.ed u> wrote in message
news:43******** **************@ reader3.news.ti n.it...
Thanks to all of you guys.

In reality I need this in an object inherited from UserControl, not from
Form.

The constructor of my UserControl will create some unmanaged objects using
interops, and I suspect this is what is causing lots of problems with my VS. See my other post just two hours ago: "Bad UserControl in toolbox".

Regards,
Fabio
"D. Yates" <fo****@hotmail .com> wrote in message
news:eH******** ********@TK2MSF TNGP09.phx.gbl. ..
Fabio,

When developing user controls or custom controls, I SOMETIMES use
this.DesignMode to prevent things from being created.

Why do you need it for a form?

Dave

"Fabio Cannizzo" <fc************ *****@london.ed u> wrote in message
news:43******** **************@ reader3.news.ti n.it...
How can I prevent a few lines of code contained in the constructor of a
Form from being executed by the Designer?

Thanks,
Fabio



Dec 29 '05 #6
I also found this:
Debugging Design-Time Controls
http://msdn.microsoft.com/library/de...edebugging.asp

which u might find interesting.

Dave
Dec 29 '05 #7
Learn something new everyday.....

This article mentions what u said:
http://msdn.microsoft.com/library/de...edebugging.asp

Any class that derives from the Component class has a property called
DesignMode that is set to true when the code is executing within the
constructs of the Visual Studio .NET designer. So you have the option to
wrap code within an if statement. There's one more trick, however. The
DesignMode property isn't set to true in the constructor. Remember, there's
no real magic here. Visual Studio .NET creates your object as it parses the
InitializeCompo nent() method. Once the object is constructed, Visual Studio
..NET keeps track of the objects it creates.....

Microsoft needs to update the documentation for Component.Desig nMode
Property:

http://msdn.microsoft.com/library/de...nmodetopic.asp

to reflect this information!!!
Dave
Dec 29 '05 #8

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

9
6215
by: Felix Wiemann | last post by:
Sometimes (but not always) the __new__ method of one of my classes returns an *existing* instance of the class. However, when it does that, the __init__ method of the existing instance is called nonetheless, so that the instance is initialized a second time. For example, please consider the following class (a singleton in this case): >>> class C(object): .... instance = None .... def __new__(cls): .... if C.instance is None:
20
2884
by: modemer | last post by:
Question is as in subject. For example: class BaseClass { public: void func() { do something; } // I don't want this function being overloaded in its inherited class };
1
1584
by: bid | last post by:
I have 2 controls on this page as shown below. The first is a datalist control which contains links to the particular image gallery (second control) I want to display. However I only want the datalist to be used when the page is *not* posted back. I know how to hide the datalist control and prevent the databinding in the code behind from being called if the page is not posted back, but because the control contains code that is...
2
11392
by: crjunk | last post by:
I have the following code in my web page. Dim tmpReplace As String 'Giving tmpReplace the value from the textbox on the webform. tmpReplace = txtComments.Text.Trim 'Prevents report from crashing when a single quote is in string tmpReplace = tmpReplace.Replace("'", "''") 'Replace carriage return with the appropriate CharCodes.
1
1463
by: Russ | last post by:
I've been trying to get my head around this for 3 days now and it seems like everything I try does not work for one reason or another. I built a test page using the TabStrip and MultiPage controls. The example shows how to put up pictures in each tab, and it works fine. But of course I don't want pictures, I want a webform where the data is different in each tab/view. The form could be different in each tab too, but for now I'll settle...
3
3232
by: Ryu | last post by:
Hi, May I know how to prevent Javascript from being dlownloaded when the user saves at "View Source"? I have added "js" at IIS's application configuration's mapping and i have added the following at web.config: But the javascript is still being downloaded. Please help <httpHandlers> <add verb="*" path="../ig_common.js" type="System.Web.HttpForbiddenHandler"/>
7
2638
by: Sharon | last post by:
I'm writing my own control that derived from the UserControl. In my control I have some public properties (with get and set) that I do not want them to be shown on the designer properties window and I also do not want the Windows Form Designer to generate code automatically on the user Form for them. To block the properties from being shown on the designer properties window I use: public int MyProp
3
1969
by: sowencheung | last post by:
I attach an Event in document.onkeyup and another event in document.onbeforeunload in onkeyup event, if the condition is satisfied, i will activate sth, then i don't want the onbeforeunload event to happen. is it possible to accomplish this? thanks!
3
1408
by: Qu0ll | last post by:
In browsers which utilise a JIT JavaScript compiler, are there any factors that may prevent a script from being compiled before it is executed? I don't see any reason why this would be so but I would like to check that scripts that access Java classes & methods and/or scripts which are loaded dynamically using AJAX will both be valid candidates for jittering. -- And loving it, -Qu0ll (Rare, not extinct)
0
9352
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. Here is my compilation command: g++-12 -std=c++20 -Wnarrowing bit_field.cpp Here is the code in...
0
9206
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth. The Art of Business Website Design Your website is...
1
9118
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
0
7985
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
1
6652
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms. Adolph will...
0
4481
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
0
4740
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
1
3180
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
3
2122
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.