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Posted 7 Jul 2006

Detecting the IDE from a User Control

, 29 Nov 2006
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This article describes a method to detect the IDE and/or the debugger in the code-behind of a User Control.

Purpose and use of the method/concept

The function of the code described here is to differentiate whether the code-behind of a User Control is executing from the IDE (i.e., in Design view) or in Debug mode, as opposed to being executed by the project's deployed .Exe file.

The reason for doing this is that there may be specific code in the control/class which either should not execute from the IDE or should execute only from the IDE. For instance, when setting a property of the control via the IDE, the property's {set} accessor code is executed. Thus, absently detecting the IDE and controlling the code's execution, any and all code that will normally by executed at run-time will also be executed at design-time.

In testing this idea, I've found that it can be employed in the control's constructor method or in the control's OnCreateControl() and OnLoad() methods. I also saw that a control may not necessarily implement the OnLoad() and OnCreateControl() methods, but the constructor is always available as a fall-back.

I really detest that my implementation of this concept relies upon throwing (and catching) an exception. But, I found nothing on the internet concerning how to make this detection, and this was the best method I could come up with to accomplish the task.

Here is the sample code making use of this methodology:

private bool gblRunModeIs_DebugMode = false;    // Global in scope
private bool gblRunModeIs_DesignMode = false;   // Global in scope

protected override void OnLoad(EventArgs e)
    // TODO:  Add TdhListViewCtl.OnLoad implementation
    base.OnLoad (e);

    gblRunModeIs_DebugMode = System.Diagnostics.Debugger.IsAttached;
    gblRunModeIs_DesignMode = false;
    //    string dummy = System.Reflection.Assembly.GetEntryAssembly().Location.ToString();
    //    string dummy = System.Reflection.Assembly.GetEntryAssembly().FullName;
    //catch (System.NullReferenceException ex)
    //    gblRunModeIs_IDE_Logic = true;
    // A much better method for setting 'gblRunModeIs_DesignMode'
    // Determine whether the class is in DesignMode
    // by examining the .ProcessName of the current Process
    if (System.Diagnostics.Process.GetCurrentProcess().ProcessName.ToLower() == "devenv")
        gblRunModeIs_DesignMode = true;

    #region Special IDE "eye-candy" code
    if (gblRunModeIs_DesignMode)     // Execute code from the IDE at design-time 
    {                // (perhaps supplying the programmer visual feed-back)
        SomeMethod(someArgument);    // Execute some specialized code
    if (gblRunModeIs_DesignMode      // Execute code from the IDE at design-time
    || gblRunModeIs_DebugMode        // or when executing in Debug mode.
        OtherMethod(otherArgument);// Execute some specialized code

private int _SomeProperty = -1;
public int SomeProperty
    get { return _SomeProperty; }
        _SomeProperty = value; 
        if (!lRunModeIs_DesignMode)
        // bypass code that isn't to execute at design-time
            // some code


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


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Comments and Discussions

GeneralRe: Download code example [modified] Pin
Ilíon29-Nov-06 2:09
memberIlíon29-Nov-06 2:09 
GeneralRe: Download code example Pin
Lazal15-Jan-09 10:34
memberLazal15-Jan-09 10:34 
GeneralRe: Download code example Pin
Ilíon15-Jan-09 11:23
memberIlíon15-Jan-09 11:23 
QuestionWhy not use DesignMode? Pin
eligazit7-Jul-06 22:20
membereligazit7-Jul-06 22:20 
I guess I'm missing something here.
Why not use the property DesignMode?
"Gets a value indicates whether the System.CompoinenetModel.Component is currently is DesingMode"

It doesn't work on the Constructur (because the control still doesn't 'know' where he will be placed at) but in the Load event and all other places it does.

-- modified at 3:22 Saturday 8th July, 2006
AnswerRe: Why not use DesignMode? Pin
Ilíon8-Jul-06 18:42
memberIlíon8-Jul-06 18:42 
GeneralRe: Why not use DesignMode? Pin
norm .net29-Nov-06 4:14
membernorm .net29-Nov-06 4:14 
GeneralRe: Why not use DesignMode? Pin
Ilíon27-Oct-07 11:43
memberIlíon27-Oct-07 11:43 
GeneralRe: Why not use DesignMode? Pin
John Simmons / outlaw programmer14-Dec-08 6:39
mvpJohn Simmons / outlaw programmer14-Dec-08 6:39 
AnswerRe: Why not use DesignMode? Pin
tonyt9-Jul-06 23:22
membertonyt9-Jul-06 23:22 
GeneralRe: Why not use DesignMode? Pin
eligazit9-Jul-06 23:32
membereligazit9-Jul-06 23:32 

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