Wpf: solve the problem that materialdesign:dialoghost cannot be closed

Use MaterialDesion Development WPF Applications ： Make a pop-up effect with a mask ：

DialogHost.Show

As shown in the figure above ： Click on “ determine ” Button to close pop-up window ;

The binding command of the close button is as follows ：

        <Button IsDefault="True" Style="{StaticResource MaterialDesignFlatButton}" 
               Width="160" Height="40"  Command="{x:Static materialDesign:DialogHost.CloseDialogCommand}" Content=" determine "></Button>

If you want to close the pop-up window in the background ：

Using the following wording may not take effect ：

 DialogHost.CloseDialogCommand.Execute(null, null);

I changed my mind and solved the problem ：

 var session = DialogHost.GetDialogSession(ROOT_DIALOG_ID);
                if (session == null)
                {
                    return;
                }
                session.Close();

Empathy ： If you need to update the display of the pop-up window during the pop-up process , have access to session.Update();

for example ：

 /// <summary>
        ///  Pop up tips , User self closing 
        /// </summary>
        /// <param name="text"></param>
        public static void PopHint(string text)
        {
            var dialog = new PopMessageBoxe
            {
                Message = { Text = text }
            };
            
            var session = DialogHost.GetDialogSession(ROOT_DIALOG_ID);
            if (session == null)
            {
                DialogHost.Show(dialog, ROOT_DIALOG_ID, ExtendedOpenedEventHandler);
            }
            else
            {
                session.UpdateContent(dialog);
            }
        }