WPF: UserControl constructor executes when opening in designer

  • Thread starter Thread starter moondaddy
  • Start date Start date
M

moondaddy

I have a user control which executes code in the class constructor. The
problem is that when I open the control in the VS 2008 designer this code
executes and causes exceptions because the app isn't actually running. How
can I determine if the class is being initialized in the designer so I can
exit the constructor after the call to the InitializeComponent() method?

Thanks.
 
Hello George,

We can call the DesignerProperties.GetIsInDesignMode() method to judge
whether the codes are executed in the designer or in the real application.

See the following codes,

public UserControl1()
{
InitializeComponent();

if (!DesignerProperties.GetIsInDesignMode(this))
{
MessageBox.Show("test2");
}
}

Only when we run our WPF application, the message box pops up. Please let
me know if this addresses your issue. If you have any other questions or
concerns, please feel free to update this thread and I will try my best to
provide future assistance.

Have a nice day George!

Best regards,
Ji Zhou ([email protected], remove 'online.')
Microsoft Online Community Support

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