How to make modal dialog in WPF

Question

If I have a Xaml Window  how does one open it as a child window  and then have the parent window wait for the child to close before the parent window continues executing

User · Answer

Given a Window object myWindow  myWindow Show   will open it modelessly and myWindow ShowDialog   will open it modally  However  even the latter doesn t block  from what I remember

User · Answer

Window Show will show the window  and continue execution -- it s a non-blocking call  Window ShowDialog will block the calling thread  kinda  1    and show the dialog  It will also block interaction with the parent owning window  When the dialog is dismissed  for whatever reason   ShowDialog will return to the caller  and will allow you to access DialogResult  if you want it    1  It will keep the dispatcher pumping by pushing a dispatcher frame onto the WPF dispatcher  This will cause the message pump to keep pumping

User · Answer

Given a Window object myWindow  myWindow Show   will open it modelessly and myWindow ShowDialog   will open it modally  However  even the latter doesn t block  from what I remember

User · Answer

Given a Window object myWindow  myWindow Show   will open it modelessly and myWindow ShowDialog   will open it modally  However  even the latter doesn t block  from what I remember

User · Answer

Did you try showing your window using the ShowDialog method   Don t forget to set the Owner property on the dialog window to the main window  This will avoid weird behavior when Alt Tabbing  etc

User · Answer

Did you try showing your window using the ShowDialog method   Don t forget to set the Owner property on the dialog window to the main window  This will avoid weird behavior when Alt Tabbing  etc

User · Answer

Window Show will show the window  and continue execution -- it s a non-blocking call  Window ShowDialog will block the calling thread  kinda  1    and show the dialog  It will also block interaction with the parent owning window  When the dialog is dismissed  for whatever reason   ShowDialog will return to the caller  and will allow you to access DialogResult  if you want it    1  It will keep the dispatcher pumping by pushing a dispatcher frame onto the WPF dispatcher  This will cause the message pump to keep pumping

User · Answer

Given a Window object myWindow  myWindow Show   will open it modelessly and myWindow ShowDialog   will open it modally  However  even the latter doesn t block  from what I remember

User · Answer

A lot of these answers are simplistic  and if someone is beginning WPF  they may not know all of the  ins-and-outs   as it is more complicated than just telling someone  Use  ShowDialog       But that is the method  not  Show    that you want to use in order to block use of the underlying window and to keep the code from continuing until the modal window is closed   First  you need 2 WPF windows    One will be calling the other    From the first window  let s say that was called MainWindow xaml  in its code-behind will be   public partial class MainWindow   Window       public MainWindow                 InitializeComponent              Then add your button to your XAML    lt Button Name  btnOpenModal  Click  btnOpenModal Click  Content  Open Modal    gt    And right-click the Click routine  select  Go to definition    It will create it for you in MainWindow xaml cs   private void btnOpenModal Click object sender  RoutedEventArgs e        Within that function  you have to specify the other page using its page class   Say you named that other page  ModalWindow   so that becomes its page class and is how you would instantiate  call  it   private void btnOpenModal Click object sender  RoutedEventArgs e        ModalWindow modalWindow   new ModalWindow        modalWindow ShowDialog        Say you have a value you need set on your modal dialog   Create a textbox and a button in the ModalWindow XAML    lt StackPanel Orientation  Horizontal  gt       lt TextBox Name  txtSomeBox    gt       lt Button Name  btnSaveData  Click  btnSaveData Click  Content  Save    gt    lt  StackPanel gt    Then create an event handler  another Click event  again and use it to save the textbox value to a public static variable on ModalWindow and call this Close       public partial class ModalWindow   Window       public static string myValue   String Empty              public ModalWindow                 InitializeComponent               private void btnSaveData Click object sender  RoutedEventArgs e                myValue   txtSomeBox Text          this Close              Then  after your  ShowDialog   statement  you can grab that value and use it   private void btnOpenModal Click object sender  RoutedEventArgs e        ModalWindow modalWindow   new ModalWindow        modalWindow ShowDialog         string valueFromModalTextBox   ModalWindow myValue

User · Answer

A lot of these answers are simplistic  and if someone is beginning WPF  they may not know all of the  ins-and-outs   as it is more complicated than just telling someone  Use  ShowDialog       But that is the method  not  Show    that you want to use in order to block use of the underlying window and to keep the code from continuing until the modal window is closed   First  you need 2 WPF windows    One will be calling the other    From the first window  let s say that was called MainWindow xaml  in its code-behind will be   public partial class MainWindow   Window       public MainWindow                 InitializeComponent              Then add your button to your XAML    lt Button Name  btnOpenModal  Click  btnOpenModal Click  Content  Open Modal    gt    And right-click the Click routine  select  Go to definition    It will create it for you in MainWindow xaml cs   private void btnOpenModal Click object sender  RoutedEventArgs e        Within that function  you have to specify the other page using its page class   Say you named that other page  ModalWindow   so that becomes its page class and is how you would instantiate  call  it   private void btnOpenModal Click object sender  RoutedEventArgs e        ModalWindow modalWindow   new ModalWindow        modalWindow ShowDialog        Say you have a value you need set on your modal dialog   Create a textbox and a button in the ModalWindow XAML    lt StackPanel Orientation  Horizontal  gt       lt TextBox Name  txtSomeBox    gt       lt Button Name  btnSaveData  Click  btnSaveData Click  Content  Save    gt    lt  StackPanel gt    Then create an event handler  another Click event  again and use it to save the textbox value to a public static variable on ModalWindow and call this Close       public partial class ModalWindow   Window       public static string myValue   String Empty              public ModalWindow                 InitializeComponent               private void btnSaveData Click object sender  RoutedEventArgs e                myValue   txtSomeBox Text          this Close              Then  after your  ShowDialog   statement  you can grab that value and use it   private void btnOpenModal Click object sender  RoutedEventArgs e        ModalWindow modalWindow   new ModalWindow        modalWindow ShowDialog         string valueFromModalTextBox   ModalWindow myValue

User · Answer

Did you try showing your window using the ShowDialog method   Don t forget to set the Owner property on the dialog window to the main window  This will avoid weird behavior when Alt Tabbing  etc

User · Answer

Did you try showing your window using the ShowDialog method   Don t forget to set the Owner property on the dialog window to the main window  This will avoid weird behavior when Alt Tabbing  etc

User · Answer

Window Show will show the window  and continue execution -- it s a non-blocking call  Window ShowDialog will block the calling thread  kinda  1    and show the dialog  It will also block interaction with the parent owning window  When the dialog is dismissed  for whatever reason   ShowDialog will return to the caller  and will allow you to access DialogResult  if you want it    1  It will keep the dispatcher pumping by pushing a dispatcher frame onto the WPF dispatcher  This will cause the message pump to keep pumping

User · Answer

Window Show will show the window  and continue execution -- it s a non-blocking call  Window ShowDialog will block the calling thread  kinda  1    and show the dialog  It will also block interaction with the parent owning window  When the dialog is dismissed  for whatever reason   ShowDialog will return to the caller  and will allow you to access DialogResult  if you want it    1  It will keep the dispatcher pumping by pushing a dispatcher frame onto the WPF dispatcher  This will cause the message pump to keep pumping

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