C# Forms.Button类代码示例

		ContentPage CreatePage (Color backgroundColor)
		{
			_index++;
			var button = new Button () {
				Text = "next Page",
			};
			button.Clicked += (sender, e) => {
				var page = CreatePage (Color.Green);
				_navigationPage.PushAsync (page);
			};

			var contentPage = new ContentPage () {
				Content = new StackLayout () {
					BackgroundColor = backgroundColor,
					VerticalOptions = LayoutOptions.Fill,
					Children = {
						new Label () {
							Text = "page " + _index,
						},

					}
				}
			};
			return contentPage;
		}

		public MyControls ()
		{
			Title = "My First Xamarin.Forms";

			var label = new Label {
				Text = "Custom label",
				Font = Font.SystemFontOfSize (20),
				TextColor = Color.Aqua,
				BackgroundColor = Color.Gray,
				IsVisible = true,
				LineBreakMode = LineBreakMode.WordWrap
			};

			var button = new Button { Text = "Click Me!" };
			int i = 1;
			button.Clicked += (s, e) => button.Text = "You clicked me: " + i++;

			button.Clicked += (s, e) => Navigation.PushAsync(new MySecondPage());

			Content = new StackLayout {
				Spacing = 10,
				VerticalOptions = LayoutOptions.Center,
				Children = {
					label,
					button
				}
			};
		}

        public ScriptInputGroupPage(InputGroup inputGroup, List<InputGroup> previousInputGroups)
        {
            Title = "Input Group";

            StackLayout contentLayout = new StackLayout
            {
                Orientation = StackOrientation.Vertical,
                VerticalOptions = LayoutOptions.FillAndExpand
            };

            foreach (StackLayout stack in UiProperty.GetPropertyStacks(inputGroup))
                contentLayout.Children.Add(stack);

            Button editInputsButton = new Button
            {
                Text = "Edit Inputs",
                FontSize = 20,
                HorizontalOptions = LayoutOptions.FillAndExpand
            };

            editInputsButton.Clicked += async (o, e) =>
            {
                await Navigation.PushAsync(new ScriptInputsPage(inputGroup, previousInputGroups));
            };

            contentLayout.Children.Add(editInputsButton);

            Content = new ScrollView
            {
                Content = contentLayout
            };
        }

        public ProductImagePage(ImageSource productImageSource)
        {
            Padding = Device.OnPlatform(new Thickness(0, 20, 0, 0), new Thickness(0), new Thickness(0));
            _productImageSource = productImageSource;
            BackgroundColor = Color.FromRgba(0, 0, 0, 127);

            var absoluteLayout = new AbsoluteLayout
            {
                VerticalOptions = LayoutOptions.FillAndExpand
            };
            var closeButtom = new Button
            {
                WidthRequest = 50,
                Image = "backspace.png",
                BackgroundColor = Color.Transparent
            };
            closeButtom.Clicked += OnCloseButtonClicked;
            var image = new Image
            {
                Source = _productImageSource
            };
            AbsoluteLayout.SetLayoutFlags(closeButtom, AbsoluteLayoutFlags.PositionProportional);
            AbsoluteLayout.SetLayoutBounds(closeButtom, new Rectangle(1f, 0f, AbsoluteLayout.AutoSize, AbsoluteLayout.AutoSize));
            AbsoluteLayout.SetLayoutFlags(image, AbsoluteLayoutFlags.PositionProportional);
            AbsoluteLayout.SetLayoutBounds(image, new Rectangle(0.5f, 0.5f, AbsoluteLayout.AutoSize, AbsoluteLayout.AutoSize));
            absoluteLayout.Children.Add(image); 
            absoluteLayout.Children.Add(closeButtom);

            Content = absoluteLayout;
        }

		public HomePageCS ()
		{
			var rotateButton = new Button { Text = "Rotate Animation" };
			rotateButton.Clicked += OnRotateAnimationButtonClicked;
			var relativeRotateButton = new Button { Text = "Relative Rotate Animation" };
			relativeRotateButton.Clicked += OnRelativeRotateAnimationButtonClicked;
			var rotateAnchorButton = new Button { Text = "Rotate Animation with Anchors" };
			rotateAnchorButton.Clicked += OnRotateAnimationWithAnchorsButtonClicked;
			var multipleRotateButton = new Button { Text = "Multiple Rotations" };
			multipleRotateButton.Clicked += OnMultipleRotationAnimationButtonClicked;
			var scaleButton = new Button { Text = "Scale Animation" };
			scaleButton.Clicked += OnScaleAnimationButtonClicked;
			var relativeScaleButton = new Button { Text = "Relative Scale Animation" };
			relativeScaleButton.Clicked += OnRelativeScaleAnimationButtonClicked;
			var transformButton = new Button { Text = "Transform Animation" };
			transformButton.Clicked += OnTransformAnimationButtonClicked;
			var fadeButton = new Button { Text = "Fade Animation" };
			fadeButton.Clicked += OnFadeAnimationButtonClicked;

			Title = "Basic Animation Demo";
			Content = new StackLayout { 
				Margin = new Thickness (0, 20, 0, 0),
				Children = {
					rotateButton,
					relativeRotateButton,
					rotateAnchorButton,
					multipleRotateButton,
					scaleButton,
					relativeScaleButton,
					transformButton,
					fadeButton
				}
			};
		}

        public Pagina1()
        {
            Label texto = new Label {
                Text = "Página 1",
                TextColor = Color.Blue
            };

            Button boton = new Button
            {
                Text = "Click para navegar a la página DOS"
            };

            boton.Clicked += (sender, e) => {
                this.Navigation.PushAsync(new Pagina2());
            };

            //Stacklayout permite apilar los controles verticalmente
            StackLayout stackLayout = new StackLayout
            {
                Children =
                {
                    texto,
                    boton
                }
            };

            //Como esta clase hereda de ContentPage, podemos usar estas propiedades directamente
            this.Content = stackLayout;
            this.Padding = new Thickness (5, Device.OnPlatform (20, 5, 5), 5, 5);
        }

		public RequiredFieldTriggerPage ()
		{
			var l = new Label {
				Text = "Entry requires length>0 before button is enabled",
			};
			l.FontSize = Device.GetNamedSize (NamedSize.Small, l); 

			var e = new Entry { Placeholder = "enter name" };

			var b = new Button { Text = "Save",

				HorizontalOptions = LayoutOptions.Center
			};
			b.FontSize = Device.GetNamedSize (NamedSize.Large ,b);

			var dt = new DataTrigger (typeof(Button));
			dt.Binding = new Binding ("Text.Length", BindingMode.Default, source: e);
			dt.Value = 0;
			dt.Setters.Add (new Setter { Property = Button.IsEnabledProperty, Value = false });
			b.Triggers.Add (dt);

			Content = new StackLayout { 
				Padding = new Thickness(0,20,0,0),
				Children = {
					l,
					e,
					b
				}
			};
		}

        public InitialPage()
        {
            BindingContext = new InitialPageModel (this.Navigation);

            Title = "Welcome to Peter";

            Label timeLabel = new Label {
                HorizontalOptions = LayoutOptions.Center,
            };
            timeLabel.SetBinding<InitialPageModel> (Label.TextProperty, vm => vm.DrinkingHoursDisplay);

            Slider timeSlider = new Slider (1, 24, 5) {
                HorizontalOptions = LayoutOptions.FillAndExpand,
            };
            timeSlider.SetBinding<InitialPageModel> (Slider.ValueProperty, vm => vm.DrinkingHours, BindingMode.TwoWay);

            Button pressMe = new Button {
                Text = "Help Peter",
                HorizontalOptions = LayoutOptions.CenterAndExpand,
                VerticalOptions = LayoutOptions.CenterAndExpand,
                FontSize = 60,
                HeightRequest = 200,
                BackgroundColor = Color.Yellow,
            };
            pressMe.SetBinding<InitialPageModel> (Button.CommandProperty, vm => vm.PressMeCommand);

            Content = new StackLayout {
                Children = {
                    timeLabel,
                    timeSlider,
                    pressMe,
                }
            };
        }

        public App()
        {
            var btnCs = new Button()
            {
                Text = "Abas Code Only"
            };
            btnCs.Clicked += btnCs_Clicked;

            var btnXaml = new Button()
            {
                Text = "Abas XAML"
            };
            btnXaml.Clicked += btnXaml_Clicked;

            // The root page of your application
            MainPage = new NavigationPage(new ContentPage
            {
                Content = new StackLayout
                {
                    VerticalOptions = LayoutOptions.Center,
                    Children = {
                        new Label {
                            XAlign = TextAlignment.Center,
                            Text = "Abra uma das Telas"
                        },
                        btnCs,
                        btnXaml
                    }
                }
            });
        }

 public Page2()
 {
     var label = new Label { Text = "Hello ContentPage 2" };
     Device.OnPlatform(
         iOS: () => {
             var parentTabbedPage = this.ParentTabbedPage() as MainTabbedPage;
             if (parentTabbedPage != null) {
                 // HACK: get content out from under status bar if a navigation bar isn't doing that for us already.
                 Padding = new Thickness(Padding.Left, Padding.Top + 25f, Padding.Right, Padding.Bottom);
             }
         }
     );
     var button = new Button() {
         Text = "Switch to Tab 1; add a Page 2 there",
     };
     button.Clicked += async (sender, e) => {
         var tabbedPage = this.ParentTabbedPage() as MainTabbedPage;
         var partPage = new Page2() { Title = "Added page 2" };
         await tabbedPage.SwitchToTab1(partPage, resetToRootFirst: false);
     };
     Content = new StackLayout {
         Children = {
             button,
             label,
         }
     };
 }

		public MultipleChoiceQuestion ()
		{
			Title = "Multiple Choice";

			Label q1 = new Label{ Text = "Identify the visual field defect below." };

			var answers = new String[]{"Choose an option", "Bitemporal hemianopia", "Binasal hemianopia", "Central scotoma", "Right homonymous hemianopia", "Temporal homonymous hemianopia"};

			Picker q1a = new Picker ();

			foreach (var a in answers) {
				q1a.Items.Add (a);
			}

			var button = new Button {Text="Submit"};
			button.Clicked += (object sender, EventArgs e) =>  {
				if(q1a.SelectedIndex == 1){
					DisplayAlert("Correct!", "Well done, that's the right answer", "OK");
				}else{
					DisplayAlert("Incorrect", String.Format("The correct answer is {0}", answers[1]), "OK");
				}
			};

			Content = new StackLayout { 
				Children = {
					q1,
					new Image{
						Source = ImageSource.FromUri(new Uri("http://i.imgur.com/q7l03ZG.png"))
					},
					q1a,
					button
				}
			};
		}

        public ContentDemo()
        {
            Button button = new Button
            {
                Text = "Edit Profile",
                HorizontalOptions = LayoutOptions.Center,
                VerticalOptions = LayoutOptions.CenterAndExpand
            };
            button.Clicked += OnButtonClicked;

            Image myImage = new Image
            {
                Aspect = Aspect.Fill,
                Source = ImageSource.FromUri( new Uri(@"https://4e72eb44013d543eb0c67f8fbddf2ed30743ec8d.googledrive.com/host/0B70CO9lnNPfceHNFLXh2Wm8yMHc/List-Most-Expensive-Cars-photo-OdYL.jpg"))
            };
            this.Title = "Content Page";

            RelativeLayout relativeLayout = new RelativeLayout ();

            relativeLayout.Children.Add (myImage,
                Constraint.Constant (0),
                Constraint.Constant (0),
                Constraint.RelativeToParent ((parent) => { return parent.Width; }),
                Constraint.RelativeToParent ((parent) => { return parent.Height; }));

            relativeLayout.Children.Add (button,
                Constraint.RelativeToParent ((parent) => {return parent.Width/2;} ),
                Constraint.RelativeToParent ((parent) => {return parent.Height/2;} ),
                Constraint.RelativeToParent ((parent) => { return 75.0; }),
                Constraint.RelativeToParent ((parent) => { return 75.0; }));

            Content = relativeLayout;
        }

 public MyPage()
 {
     Button buttonToUpdate = new Button {Text = "Image Button",  Image = "icon.png"};
     Button UpdatesList = new Button {Text="Add Item to list"};
     buttonToUpdate.SetBinding (Button.ImageProperty, new Binding("ImagePath"));
     UpdatesList.Clicked += (sender,e) => {
         listToWatch.Add (DateTime.Now.ToString());
     };
     listToWatch.CollectionChanged+=(sender,e)=>{
         if(	listToWatch.Count%2==1)
         {
             ImagePath="noci.png";
         }
         else
         {
             ImagePath="icon.png";
         }
     };
     Content = new StackLayout {
         Children = {
             buttonToUpdate,
             UpdatesList
         }
     };
     Content.BindingContext = this;
 }

        public TableView(MatrixMainPageView mainView)
        {
            InitializeComponent();

            _mainView = mainView;

            Title = "Таблица";

            if (Device.OS == TargetPlatform.iOS)
            {
                Icon = "tableTabIcon.png";
                {
                    var btn = new Button() { Text = "Фильтры" };
                    btn.Clicked += (s, e) =>
                    {
                        mainView.IsPresented = !mainView.IsPresented;
                    };
                    Grid.SetRow(btn,1);
                    cnvRoot.Children.Add(btn);
                }
            }

            cnvRoot.Padding = Device.OnPlatform(10, 8, 10);

            ThemeManager.ThemeName = Themes.Light;

            dataGrid.RightSwipeButtons.Add(new SwipeButtonInfo()
            {
                BackgroundColor = Color.Yellow,
                TextColor = Color.Black,
                AutoCloseOnTap = true,
                Caption = "График"
            });
            dataGrid.SwipeButtonClick += DataGrid_SwipeButtonClick;
        }

		public FilterPage ()
		{
			this.Icon = "slideout.png";
			this.Title = "Filter";

			_scope = App.AutoFacContainer.BeginLifetimeScope();

			var vm = _scope.Resolve<FilterViewModel> ();

			BindingContext = vm;

			var layout = new StackLayout ();

			layout.Children.Add (new Label() {Text = "Enter a filter"});
			layout.Children.Add (new Label() {Text = "Subject"});
			var subjectEntry = new Entry();
			subjectEntry.SetBinding (Entry.TextProperty, "Subject");
			layout.Children.Add (subjectEntry);
			var button = new Button () { Text = "Apply Filter" };
			button.SetBinding (Button.CommandProperty, "FilterMeasures");
			layout.Children.Add (button);

			Content = layout;


		}