[VS-Mac]VisualStudio for Mac (Cocoa)でファイルダイアログ表示

    //chnage title  UserInterface - Windows - Setting a Window's Title
    public override void ViewWillAppear()
    {
          base.ViewWillAppear();
          this.View.Window.Title = "My Tutorial NSOpenPanel";
          ChangeLabeltext("");
    }
    public void ChangeLabeltext(string str)
    {
          this.Label1.StringValue = str;
    }

    public ViewController Controller
    {
        get { return ContentViewController as ViewController; }
    }

    partial void FileButton_Click(NSObject sender)
    {
              var dlg = NSOpenPanel.OpenPanel;
              dlg.CanChooseFiles = true;
              dlg.CanChooseDirectories = false;
              dlg.AllowsMultipleSelection = false;
              dlg.DirectoryUrl = NSUrl.FromString(Environment.SpecialFolder.MyPictures.ToString());
              dlg.AllowedFileTypes = new string[] { "png", "jpeg", "jpg" };

            if ( dlg.RunModal() == 1)
              {
                    if (dlg.Urls[0] != null)
                    {
                        Controller.ChangeLabeltext(dlg.Urls[0].Path);
                    }
              }
            else
            {
                  var alert = new NSAlert()
                  {
                        AlertStyle = NSAlertStyle.Informational,
                        InformativeText = "Cancel Button Clicked",
                        MessageText = "Alert",
                  };
                  alert.RunModal();
            }
    }

        partial void QuitButton_Click(NSObject sender)
        {
                  NSApplication.SharedApplication.Terminate(Self);
        }

using System;

using AppKit;
using Foundation;

namespace MyTutorial_OpenFile
{
    public partial class ViewController : NSViewController
    {
        public ViewController(IntPtr handle) : base(handle)
        {
        }

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();

            // Do any additional setup after loading the view.
        }

        //###### Quote from Xamarin page ##########
        //https://developer.xamarin.com/guides/mac/user-interface/working-with-windows/
        //chnage title  UserInterface - Windows - Setting a Window's Title
        public override void ViewWillAppear()
        {
            base.ViewWillAppear();
            this.View.Window.Title = "My Tutorial NSOpenPanel";
            ChangeLabeltext("");
        }
        //#########################################
        public void ChangeLabeltext(string str)
        {
            this.Label1.StringValue = str;
        }

        public override NSObject RepresentedObject
        {
            get
            {
                return base.RepresentedObject;
            }
            set
            {
                base.RepresentedObject = value;
                // Update the view, if already loaded.
            }
        }
    }
}

// This file has been autogenerated from a class added in the UI designer.
using System;
using Foundation;
using AppKit;
namespace MyTutorial_OpenFile
{
    public partial class WindowController : NSWindowController
    {
        //###### Quote from Xamarin page ##########
        //https://developer.xamarin.com/guides/mac/application_fundamentals/copy-paste/
        public ViewController Controller
        {
            get { return ContentViewController as ViewController; }
        }
        public WindowController(IntPtr handle) : base(handle)
        {
        }
        #region ToolButton Action
        partial void FileButton_Click(NSObject sender)
        {
            //###### Quote from Xamarin page ##########
            //https://developer.xamarin.com/guides/mac/user-interface/working-with-dialogs/#The_Open_Dialog
            var dlg = NSOpenPanel.OpenPanel;
            dlg.CanChooseFiles = true;
            dlg.CanChooseDirectories = false;
            dlg.AllowsMultipleSelection = false;
            dlg.DirectoryUrl = NSUrl.FromString(Environment.SpecialFolder.MyPictures.ToString());
            dlg.AllowedFileTypes = new string[] { "png", "jpeg", "jpg" };

            if ( dlg.RunModal() == 1)
            {
                if (dlg.Urls[0] != null)
                {
                    Controller.ChangeLabeltext(dlg.Urls[0].Path);
                }
            }
            else
            {
                //###### Quote from Xamarin page ##########
                //https://developer.xamarin.com/guides/mac/user-interface/working-with-alerts/
                var alert = new NSAlert()
                {
                    AlertStyle = NSAlertStyle.Informational,
                    InformativeText = "Cancel Button Clicked",
                    MessageText = "Alert",
                };
                alert.RunModal();
            }
        }
        partial void QuitButton_Click(NSObject sender)
        {
            //######## Refer to StackOverFlow ##########
            //http://stackoverflow.com/questions/1748895/how-to-properly-quit-application-call-exit0
            NSApplication.SharedApplication.Terminate(Self);
        }
        #endregion
    }
}