Daily Tip: How to Activate Minimized Window (Form)

24 בדצמבר 2009

This solution can be used in WPF and in WinForms (with some improvements).

Many times UI programmer needs to activate window, the activation can be done by using “Activate()” function in window. The problem is that this function will not show window if it is minimized. In that case you can use this workaround:

using System;
using System.Windows; 

namespace Test
       public partial class MyWindow
              /// <summary>
              /// Gets Previouse Window State
              /// </summary>
              public WindowState PreviouseWindowState { get; private set; }  

              /// <summary>
              /// Constructor
              /// </summary>
              public MyWindow()


                     // store 1st value
                     PreviouseWindowState = WindowState;


                     // attach to event (used to store prev. win. state)
                     LayoutUpdated += Window_LayoutUpdated;

              /// <summary>
              /// Occures on layout change
              /// </summary>
              /// <param name="sender"></param>
              /// <param name="e"></param>
              private void Window_LayoutUpdated(object sender, EventArgs e)
                     PreviouseWindowState = WindowState;

              /// <summary>
              /// Activates Window
              /// </summary>
              /// <param name="restoreIfMinimized">if [true] restore prev. win. state</param>
              /// <returns></returns>
              public bool Activate(bool restoreIfMinimized)
                     if (restoreIfMinimized && WindowState == WindowState.Minimized)
                           WindowState = PreviouseWindowState == WindowState.Normal
                                                                     ? WindowState.Normal : WindowState.Maximized;
                     return Activate();

As you can see I added new overloaded function “Activate(bool)” that allows activation of minimized window, thanks to new property “PreviouseWindowState” that stores previous value of “WindowState” when “Window_LayoutUpdated” in called.

Source Code: Window.cs

Remarks: Any comments/improvements will be accepted with pleasure. Of course, you must understand that this code is a contribution and I’m not responsible for any damage that may be caused by using it. All rights reserved ®.

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  1. sam25 בדצמבר 2009 ב 2:22

    thanks 🙂
    your trick helped me!

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  3. Steph4 במרץ 2010 ב 21:28


    First thanks a lot!

    I got some troubles with the Windows State restoration and finally did:
    private void Main_Resize(object sender, EventArgs e)
    if(WindowState != FormWindowState.Minimized) PreviouseWindowState = WindowState;

    public void Activate(bool RestoreIfMinimized)
    if (RestoreIfMinimized && (WindowState == FormWindowState.Minimized))
    WindowState = PreviouseWindowState;

    Which made it.


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