CODEWITHSUNDEEP
c#timer
user2917354
user2917354

Reputation: 45

C# User control with timer starts even in design mode

I have the following problem:

I made a user control library (DLL), which just has an enabled Timer. When I try to use this control in an application, as soon as I drag it to the Form in design mode, it starts to count! Even if the application is not running.... How can I avoid that?

My objective is that the Timer starts counting as soon as the application is launched, but not in Design Mode... because the Timer uses some external functions that cause the crash in the Design Mode.

Thank you in advanced!

Dario

Upvotes: 4

Views: 1670

Answers (6)

Smartis has left SO again
Smartis has left SO again

Reputation: 5150

Probably you Start your Timer outside the GUI Thread and now it's ticking. I suggest this happens in the constructor of your Control. Change this to a separate method or post some Code to make a clear view of your Problem.

Upvotes: 1

Matthew Watson
Matthew Watson

Reputation: 109577

Like many people have said, you can check if the control is in design mode.

The problem you might face is that the Control.DesignMode property doesn't work properly for nested controls; it always returns false.

Here is a fixed version that you can use instead:

public static bool IsDesignMode(Control control)
{
    if (LicenseManager.UsageMode == LicenseUsageMode.Designtime)  // Initial quick check.
    {
        return true;
    }

    while (control != null)
    {
        System.ComponentModel.ISite site = control.Site;

        if ((site != null) && (site.DesignMode))
            return true;

        control = control.Parent;
    }

    return false;
}

Upvotes: 0

jhyap
jhyap

Reputation: 3837

Besides adding new user control from the form, you can also create your user control by coding at Form1.Designer.cs 

using System.Windows.Forms;

public class MyTimer : Timer
{
    public MyTimer()
    {
        // Set your custom timer properties here.
        this.Enabled = false;
    }
}

Upvotes: 1

Sriram Sakthivel
Sriram Sakthivel

Reputation: 73472

Timer_Tick(object sender, EventArgs e)
{
    if(this.DesignMode)
       return;
    //Rest of your code here
}

Upvotes: 2

Simon Whitehead
Simon Whitehead

Reputation: 65079

You can check the DesignMode property of Control:

if (!this.DesignMode) {
    // its not in design mode.. so do stuff.
}

Or perhaps neater:

yourTimer.Enabled = !this.DesignMode;

Upvotes: 3

user2604650
user2604650

Reputation:

Check if Timer is not started in control's constructor - that is the most possible reason of such behavior.

Upvotes: 1

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