maui sqlite开发一个商城加购物车的演示(1)

界面演示



csharp 复制代码
using ShoppingUI;

namespace ShoppingUI;

public partial class App : Application
{

    public App()
	{
		InitializeComponent();
		MainPage = new LoginPage();
	}
    static LoginDatabase database;

    // Create the database connection as a singleton.
    public static LoginDatabase Database
    {
        get
        {
            if (database == null)
            {
                database = new LoginDatabase(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "shop.db"));
            }
            return database;
        }
    }
}

上在是sqlite的链接。

csharp 复制代码
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="ShoppingUI.LoginPage"
             Title="登陆">
    <ContentPage.Content>
        <Grid>
            <Image Source="landscape.png" VerticalOptions="Center" Aspect="Center"/>
            <Grid HorizontalOptions="Center" VerticalOptions="Center" Padding="10">
                <Grid.RowDefinitions>
                    <RowDefinition Height="auto"/>
                    <RowDefinition Height="auto"/>
                    <RowDefinition Height="auto"/>
                    <RowDefinition Height="auto"/>
                    <RowDefinition Height="auto"/>
                    <RowDefinition Height="auto"/>
                </Grid.RowDefinitions>
                <Label Grid.Row="0" Grid.Column="0" Text="手机号" FontSize="17" FontAttributes="Bold" TextColor="#2C363C"/>
                <Frame Grid.Row="1" Grid.Column="0" HeightRequest="50" >
                    <!-- 使用 Keyboard 属性设置为 Telephone,MaxLength 设置为 11 -->
                    <Entry  Text="{Binding UserName}" BackgroundColor="White" HeightRequest="48"  WidthRequest="200" Keyboard="Telephone" MaxLength="11"/>
                </Frame>
                <Label Grid.Row="2" Text="密码" Padding="0,20,0,0" FontAttributes="Bold" FontSize="17" TextColor="#2C363C"/>
                <Frame Grid.Row="3" HeightRequest="50">
                    <!-- 使用 Keyboard 属性设置为 Numeric,MaxLength 设置为 6 -->
                    <Entry Text="{Binding Password}" IsPassword="True" BackgroundColor="White" HeightRequest="48"  WidthRequest="200" Keyboard="Numeric" MaxLength="6"/>
                </Frame>
                <Grid Grid.Row="4" Padding="0,40,0,0">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="Auto"/>
                        <ColumnDefinition Width="Auto"/>
                    </Grid.ColumnDefinitions>

                    <Button Grid.Row="4" Grid.Column="0" Text="登陆" Command="{Binding LoginCommand}" TextColor="White" BackgroundColor="#2C363C" HeightRequest="40" WidthRequest="100"/>
                    <Button Grid.Row="4" Grid.Column="1" Text="注册" Command="{Binding RegisterCommand}" TextColor="White" BackgroundColor="#2C363C" HeightRequest="40" WidthRequest="100"  Margin="10,0,0,0" />
                </Grid>
            </Grid>
        </Grid>
    </ContentPage.Content>
</ContentPage>
csharp 复制代码
namespace ShoppingUI;
下面this.BindingContext = new LoginViewModel(this.Navigation);将LoginViewModel绑定到xaml.
public partial class LoginPage : ContentPage
{
	public LoginPage()
	{
		InitializeComponent();
        this.BindingContext = new LoginViewModel(this.Navigation);
       
    }
}
csharp 复制代码
using SQLite;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ShoppingUI
{
    public class LoginDatabase
    {
        readonly SQLiteAsyncConnection database;

        public LoginDatabase(string dbPath)
        {
            database = new SQLiteAsyncConnection(dbPath);
            database.CreateTableAsync<LoginModel>().Wait();
        }

        public Task<LoginModel> GetLoginDataAsync(string userName)
        {
            return database.Table<LoginModel>()
                            .Where(i => i.UserName == userName)
                            .FirstOrDefaultAsync();
        }

        public Task<int> SaveLoginDataAsync(LoginModel loginData)
        {
            return database.InsertAsync(loginData);
        }
    }
}
相关推荐
FG.几秒前
Day22
java·面试
apihz1 分钟前
域名WHOIS信息查询免费API使用指南
android·开发语言·数据库·网络协议·tcp/ip
菜鸟的迷茫2 分钟前
Redis 缓存雪崩、穿透、击穿面试题深度解析与 Spring Boot 实战代码示例
java
gwcgwcjava7 分钟前
[时序数据库-iotdb]时序数据库iotdb的安装部署
数据库·时序数据库·iotdb
珹洺13 分钟前
C++算法竞赛篇:DevC++ 如何进行debug调试
java·c++·算法
SHUIPING_YANG21 分钟前
根据用户id自动切换表查询
java·服务器·数据库
爱吃烤鸡翅的酸菜鱼33 分钟前
IDEA高效开发:Database Navigator插件安装与核心使用指南
java·开发语言·数据库·编辑器·intellij-idea·database
超奇电子38 分钟前
阿里云OSS预签名URL上传与临时凭证上传的技术对比分析
数据库·阿里云·云计算
惊涛骇浪、39 分钟前
SpringMVC + Tomcat10
java·tomcat·springmvc
神仙别闹1 小时前
基于C#+SQL Server实现(Web)学生选课管理系统
前端·数据库·c#