郫县建设局网站,离石网站建设公司,wordpress标签页,网站在哪设置关键词适用于初学者的 .NET MAUI | Microsoft Learn
记录微软Learn中用到的代码。文章比较粗糙#xff0c;大部分是项目代码粘贴。想详细学习的可到上面的链接学习#xff0c;代码可以从这里复制后直接运行。 练习中一共有两个页面#xff1a;
1、MainPage.xaml 用于添加列表中的…
适用于初学者的 .NET MAUI | Microsoft Learn
记录微软Learn中用到的代码。文章比较粗糙大部分是项目代码粘贴。想详细学习的可到上面的链接学习代码可以从这里复制后直接运行。 练习中一共有两个页面
1、MainPage.xaml 用于添加列表中的内容。主要功能有向列表中添加一项左滑删除该项点击该选项进入详情页面。
2、DetailPage.xaml 显示详细信息实际上显示的很少。返回主界面。 用到的MVVM包有
1、CommunityToolkit.Mvvm 接下来是MainPage.xaml代码
?xml version1.0 encodingutf-8 ?
ContentPage xmlnshttp://schemas.microsoft.com/dotnet/2021/mauixmlns:xhttp://schemas.microsoft.com/winfx/2009/xamlx:ClassMauiAppDemo1.MainPagexmlns:viewmodeclr-namespace:MauiAppDemo1.ViewModelx:DataTypeviewmode:MainViewModelGrid RowDefinitions100,Auto,*ColumnDefinitions.75*,.25*Padding10RowSpacing10ColumnSpacing10Image Grid.ColumnSpan2Sourcedotnet_bot.pngBackgroundwhite/Entry PlaceholderEnter taskText{Binding Text}Grid.Row1/Button TextAddCommand{Binding AddCommand}Grid.Row1Grid.Column1/CollectionView Grid.Row2 Grid.ColumnSpan2ItemsSource{Binding Items}SelectionModeNone!--CollectionView.ItemsSourcex:Array Type{x:Type x:String}x:StringApples/x:Stringx:StringBananas/x:Stringx:StringOranges/x:String/x:Array/CollectionView.ItemsSource--CollectionView.ItemTemplateDataTemplate x:DataType{x:Type x:String}SwipeViewSwipeView.RightItemsSwipeItems SwipeItem TextDeleteBackgroundColorRedCommand{Binding Source{RelativeSource AncestorType{x:Type viewmode:MainViewModel}},PathDeleteCommand}CommandParameter{Binding .}//SwipeItems/SwipeView.RightItemsGrid Padding0,5FrameFrame.GestureRecognizersTapGestureRecognizer Command{Binding Source{RelativeSource AncestorType{x:Type viewmode:MainViewModel}},PathTapCommand}CommandParameter{Binding .}//Frame.GestureRecognizersLabel Text{Binding .}FontSize24//Frame/Grid/SwipeView/DataTemplate/CollectionView.ItemTemplate/CollectionView/Grid/ContentPageusing MauiAppDemo1.ViewModel;namespace MauiAppDemo1;public partial class MainPage : ContentPage
{int count 0;public MainPage(MainViewModel vm){InitializeComponent();BindingContext vm;}} using MauiAppDemo1.ViewModel;namespace MauiAppDemo1;public static class MauiProgram
{public static MauiApp CreateMauiApp(){var builder MauiApp.CreateBuilder();builder.UseMauiAppApp().ConfigureFonts(fonts {fonts.AddFont(OpenSans-Regular.ttf, OpenSansRegular);fonts.AddFont(OpenSans-Semibold.ttf, OpenSansSemibold);});builder.Services.AddSingletonMainPage();builder.Services.AddSingletonMainViewModel();builder.Services.AddTransientDetailPage();builder.Services.AddSingletonDetailViewModel(); return builder.Build();}
}namespace MauiAppDemo1;public partial class AppShell : Shell
{public AppShell(){InitializeComponent();Routing.RegisterRoute(nameof(DetailPage),typeof(DetailPage));}
}using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace MauiAppDemo1.ViewModel
{/// summary/// CommunityToolkit.Mvvm/// /summarypublic partial class MainViewModel : ObservableObject{public MainViewModel(){items new ObservableCollectionstring();}[ObservableProperty]ObservableCollectionstring items;[ObservableProperty]string text;[RelayCommand]void Add(){if (string.IsNullOrWhiteSpace(Text)) return;items.Add(Text);Text string.Empty;}[RelayCommand]void Delete(string s){if (items.Contains(s)){items.Remove(s);}}[RelayCommand] async Task Tap(string s){await Shell.Current.GoToAsync(${nameof(DetailPage)}?Text{s});}}/// summary/// 基本写法/// /summary//public class MainViewModel : INotifyPropertyChanged//{// string text;// public string Text// {// get text;// set// {// textvalue;// OnPropertyChanged(nameof(Text));// }// }// public event PropertyChangedEventHandler PropertyChanged;// void OnPropertyChanged(string name)PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));//}
}DetailPage.xaml ?xml version1.0 encodingutf-8 ?
ContentPage xmlnshttp://schemas.microsoft.com/dotnet/2021/mauixmlns:xhttp://schemas.microsoft.com/winfx/2009/xamlx:ClassMauiAppDemo1.DetailPagexmlns:viewmodelclr-namespace:MauiAppDemo1.ViewModelx:DataTypeviewmodel:DetailViewModelTitleDetailPageVerticalStackLayout Padding20Label Text{Binding Text}FontSize25VerticalOptionsCenter HorizontalOptionsCenter /Button TextGo BackCommand{Binding GoBackCommand}//VerticalStackLayout
/ContentPage
using MauiAppDemo1.ViewModel;namespace MauiAppDemo1;public partial class DetailPage : ContentPage
{public DetailPage(DetailViewModel vm){InitializeComponent();BindingContext vm;}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;namespace MauiAppDemo1.ViewModel
{[QueryProperty(Text,Text)]public partial class DetailViewModel:ObservableObject{[ObservableProperty]string text;[RelayCommand]async Task GoBack(){await Shell.Current.GoToAsync(..);}}
}
