Daniil Harik Daniil Harik - 4 years ago 87
C# Question

.NET WPF Remember window size between sessions

Basically when user resizes my application's window I want application to be same size when application is re-opened again.

At first I though of handling SizeChanged event and save Height and Width, but I think there must be easier solution.

Pretty simple problem, but I can not find easy solution to it.

Answer Source

Save the values in the user.config file.

You'll need to create the value in the settings file - it should be in the Properties folder. Create five values:

  • Top of type double
  • Left of type double
  • Height of type double
  • Width of type double
  • Maximized of type bool - to hold whether the window is maximized or not. If you want to store more information then a different type or structure will be needed.

Initialise the first two to 0 and the second two to the default size of your application, and the last one to false.

In the constructor:

this.Top = Properties.Settings.Default.Top;
this.Left = Properties.Settings.Default.Left;
this.Height = Properties.Settings.Default.Height;
this.Width = Properties.Settings.Default.Width;
// Very quick and dirty - but it does the job
if (Properties.Settings.Default.Maximized)
    WindowState = WindowState.Maximized;

Create a Window_Closing event handler and add the following:

if (WindowState == WindowState.Maximized)
    // Use the RestoreBounds as the current values will be 0, 0 and the size of the screen
    Properties.Settings.Default.Top = RestoreBounds.Top;
    Properties.Settings.Default.Left = RestoreBounds.Left;
    Properties.Settings.Default.Height = RestoreBounds.Height;
    Properties.Settings.Default.Width = RestoreBounds.Width;
    Properties.Settings.Default.Maximized = true;
    Properties.Settings.Default.Top = this.Top;
    Properties.Settings.Default.Left = this.Left;
    Properties.Settings.Default.Height = this.Height;
    Properties.Settings.Default.Width = this.Width;
    Properties.Settings.Default.Maximized = false;


This will fail in if the user makes the display area smaller - either by disconnecting a screen or changing the screen resolution - while the application is closed so you should add a check that the desired location and size is still valid before applying the values.

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