Styjun

I'm Working on a WPF application which automatically restart after specific interval of time (I'm using DispatcherTimer for that purpose). The problem is how to know WPF window's last Startup_Location.. Because I needed to set that location when it restart..

(I have set Default Startup_Location "CenterOwner" in XAML code like

WindowStartupLocation="CenterOwner"

but if user change that location then I need to know that location to set when WPF restart)

Secondly How to know WPF window was minimized last time as this is also need to set when it restart
Thanks

As others have already pointed out, you will have to store the attributes of the window to persist them between the starts. In order to set the location of the Window you have to set WindowStartupLocation to WindowStartupLocation.Manual. You would have to start the main window manually from the App.xaml.cs.

In order to change the way WPF starts your application, you have to modify the App.xaml and change the active property StartupUri to the event handler property Startup and assign a handler method to it (in this case named Run):

<Application x:Class="WpfTestRange.Main.App"
 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 Startup="Run">
</Application>

Then implement the handler in the App.xaml.cs and start the main window manually:

private void Run(object sender, StartupEventArgs e)

 this.MainWindow = new MainWindow();
 this.MainWindow.Closing += SaveWindowAttributes;
 RestoreWindow();
 this.MainWindow.Show();


protected void RestoreWindow()

 this.MainWindow.WindowStartupLocation = WindowStartupLocation.Manual;
 var reader = new AppSettingsReader();

 string windowStateValue;
 try
 
 windowStateValue = reader.GetValue("WindowState", typeof(string)) as string;
 
 catch (InvalidOperationException)
 
 // There are no previously persisted values (first launch)
 return;
 

 WindowState windowState;
 if (!string.IsNullOrWhiteSpace(windowStateValue) && Enum.TryParse(windowStateValue, out windowState))
 
 this.MainWindow.WindowState = windowState;
 

 string windowTopValue = reader.GetValue("WindowPositionTop", typeof(string)) as string;
 string windowLeftValue = reader.GetValue("WindowPositionLeft", typeof(string)) as string;

 double windowPositionTop;
 double windowPositionLeft;
 if (!string.IsNullOrWhiteSpace(windowStateValue) 
 && double.TryParse(windowTopValue, out windowPositionTop) 
 && double.TryParse(windowLeftValue, out windowPositionLeft))
 
 this.MainWindow.Top = windowPositionTop;
 this.MainWindow.Left = windowPositionLeft;
 



private void SaveWindowAttributes(object sender, CancelEventArgs e)

 string sectionName = "appSettings";
 Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

 string currentWindowState = this.MainWindow.WindowState.ToString();
 if (config.AppSettings.Settings["WindowState"] == null)
 
 config.AppSettings.Settings.Add("WindowState", currentWindowState);
 
 else
 
 config.AppSettings.Settings["WindowState"].Value = currentWindowState;
 

 string currentWindowPositionTop = this.MainWindow.Top.ToString("G");
 if (config.AppSettings.Settings["WindowPositionTop"] == null)
 
 config.AppSettings.Settings.Add("WindowPositionTop", currentWindowPositionTop);
 
 else
 
 config.AppSettings.Settings["WindowPositionTop"].Value = currentWindowPositionTop;
 

 string currentWindowPositionLeft = this.MainWindow.Left.ToString("G");
 if (config.AppSettings.Settings["WindowPositionLeft"] == null)
 
 config.AppSettings.Settings.Add("WindowPositionLeft", currentWindowPositionLeft);
 
 else
 
 config.AppSettings.Settings["WindowPositionLeft"].Value = currentWindowPositionLeft;
 
 config.Save(ConfigurationSaveMode.Full);
 ConfigurationManager.RefreshSection(sectionName);