SaveMapPage.xaml.cs

namespace ArcGIS.Samples.AuthorMap
{
    public partial class SaveMapPage : ContentPage
    {
        // Raise an event so the listener can access input values when the form has been completed
        public event EventHandler<SaveMapEventArgs> OnSaveClicked;

        public SaveMapPage()
        {
            InitializeComponent();
        }

        // If updating an existing map item, show the existing item info and disable changing info
        public void ShowForUpdate(string title, string description, string[] tags)
        {
            // Item title
            MapTitleEntry.Text = title;
            MapTitleEntry.IsEnabled = false;

            // Item description
            MapDescriptionEntry.Text = description;
            MapDescriptionEntry.IsEnabled = false;

            // Item tags
            MapTagsEntry.Text = string.Join(",", tags);
            MapTagsEntry.IsEnabled = false;

            // Show 'Update' rather than 'Save' for button text
            SaveMapButton.Text = "Update";
        }

        // A click handler for the save map button
        private void SaveButtonClicked(object sender, EventArgs e)
        {
            try
            {
                // Get information for the new portal item
                string title = MapTitleEntry.Text;
                string description = MapDescriptionEntry.Text;
                string[] tags = MapTagsEntry.Text.Split(',');

                // Make sure all required info was entered
                if (string.IsNullOrEmpty(title) || string.IsNullOrEmpty(description) || tags.Length == 0)
                {
                    throw new Exception("Please enter a title, description, and some tags to describe the map.");
                }

                // Create a new OnSaveMapEventArgs object to store the information entered by the user
                SaveMapEventArgs mapSavedArgs = new SaveMapEventArgs(title, description, tags);

                // Raise the OnSaveClicked event so the main activity can handle the event and save the map
                OnSaveClicked?.Invoke(this, mapSavedArgs);

                // Close the dialog
                Application.Current.MainPage.Navigation.PopAsync();
            }
            catch (Exception ex)
            {
                // Show the exception message (dialog will stay open so user can try again)
                Application.Current.MainPage.DisplayAlert("Error", ex.Message, "OK");
            }
        }

        private void CancelButtonClicked(object sender, EventArgs e)
        {
            // If the user cancels, just navigate back to the previous page
            Application.Current.MainPage.Navigation.PopAsync();
        }
    }

    // Custom EventArgs class for containing portal item properties when saving a map
    public class SaveMapEventArgs : EventArgs
    {
        // Portal item title
        public string MapTitle { get; set; }

        // Portal item description
        public string MapDescription { get; set; }

        // Portal item tags
        public string[] Tags { get; set; }

        public SaveMapEventArgs(string title, string description, string[] tags) : base()
        {
            MapTitle = title;
            MapDescription = description;
            Tags = tags;
        }
    }
}