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I have an auto-sized application user control in WPF (Height="Auto" Width="Auto"). When a bunch of elements inside it are resized, the windows stays the same rendered size. How do I force it to resize? I have tried this line Application.Current.MainWindow.SizeToContent = SizeToContent.WidthAndHeight; in the function that resizes the components inside the window. The compiler gives me an error that there is no object associated with this call. I have tried this line MainWindowBorder.Height = Double.NaN; to trick it to resize. No luck either.

Sean
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  • Did you try window.height -= amount you resized your elements – Master117 May 11 '16 at 19:31
  • You could definitely keep track of how much everything is changing and manually do it how @Master117 mentioned. It can be a bit tedious to get the code in order, depending on how many controls you have and how they change, but it would definitely work. – Broots Waymb May 11 '16 at 19:33
  • All of the elements inside are re-sized automatically. I collapse or make visible elements inside a series of grids, so I can't manually change the size without tedious calculations. The window contains the collection of these auto-resized grids. – Sean May 11 '16 at 19:35
  • IIRC, you need to make the window non-user-resizable. – SLaks May 11 '16 at 19:38
  • If it's a grid i think you need to stick it into a panel or something similar for auto to work. Not 100% sure. – Master117 May 11 '16 at 19:38
  • This may be helpful for you. http://stackoverflow.com/questions/16922955/window-resize-handle-event – PamZy May 11 '16 at 19:43
  • Does Application.Current.MainWindow exist since you get an "no object associated with this call" error? – Master117 May 11 '16 at 20:21
  • No, it does not exist. I do not know why. The MainView is created. – Sean May 11 '16 at 20:23
  • http://stackoverflow.com/questions/2038879/refer-to-active-window-in-wpf Try to get the window of your UserControl? A Control can't exist on its own. – Master117 May 11 '16 at 20:28
  • That doesn't work either. It still comes up with no object associated. – Sean May 12 '16 at 14:44
  • This works better. Thanks! http://stackoverflow.com/questions/16236905/access-parent-window-from-user-control – Sean May 12 '16 at 14:55

3 Answers3

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Use SizeToContent in XAML

SizeToContent="WidthAndHeight"

https://msdn.microsoft.com/en-us/library/system.windows.window.sizetocontent%28v=vs.110%29.aspx?f=255&MSPPError=-2147217396

Master117
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  • You cannot put that in the XAML. I have tried putting that in my loading page code behind (MainView()) but it gives me the error: Does not contain defintion for SizeToContent,. Also, if you read my question above, I stated that I have tried this in the code behind. – Sean May 11 '16 at 20:13
  • You cant? not like this? – Master117 May 11 '16 at 20:16
  • http://www.java2s.com/Tutorial/CSharp/0470__Windows-Presentation-Foundation/SizeToContentWidthAndHeight.htm – Master117 May 11 '16 at 20:16
  • Ah the problem is that I am doing this for a user control, not a window. – Sean May 11 '16 at 20:20
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If all the inside controls can be resized but the only one thing to resize is Window, How about this simple approach? Hope this helps..

int mycurrentscreenwidth = 1366;
int mycurrentwindowwidth = 1366;

var screen = System.Windows.Forms.Screen.PrimaryScreen.Bounds;
var screenwidth = screen.Width;

if (Convert.ToInt32(screenwidth) < 1366)
{   
    double calculate_scalefactor= Convert.ToInt32(screenwidth) / (double)mycurrentscreenwidth;
    double newwidth_tobescaled = mycurrentwindowwidth * calculate_scalefactor;

    this.Width = newwidth_tobescaled;
}
Kay Lee
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To obtain the window of your current user control, see:

Access parent window from User Control

Then use:

Window yourParentWindow = Window.GetWindow(userControl);
yourParentWindow.SizeToContent = SizeToContent.WidthAndHeight;
Community
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Sean
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