C# 如何修复:无法使用资产文件夹中已有的sqlite.db激活windows应用商店应用程序-CRUD UWP MVVM模型
添加将Repository.db从资产文件夹复制到本地存储的方法后的App.xaml.cs代码 如果我取消对App.xaml.cs sqlite.db代码的注释,应用程序将在调试后运行,而不加载数据。当我的插入点在App.xaml.cs中的Onloadlaunched()方法中的UseSqlite()方法之后被去除时。但是,引发的未经处理的异常会指向SqlTutorialRepository.cs中的EnsureCreated()方法C# 如何修复:无法使用资产文件夹中已有的sqlite.db激活windows应用商店应用程序-CRUD UWP MVVM模型,c#,xaml,uwp,C#,Xaml,Uwp,添加将Repository.db从资产文件夹复制到本地存储的方法后的App.xaml.cs代码 如果我取消对App.xaml.cs sqlite.db代码的注释,应用程序将在调试后运行,而不加载数据。当我的插入点在App.xaml.cs中的Onloadlaunched()方法中的UseSqlite()方法之后被去除时。但是,引发的未经处理的异常会指向SqlTutorialRepository.cs中的EnsureCreated()方法 using CustomerOrders.Models; u
using CustomerOrders.Models;
using CustomerOrders.Repository;
using CustomerOrders.Views;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Threading.Tasks;
using Windows.ApplicationModel;
using Windows.ApplicationModel.Activation;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.Storage;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
namespace CustomerOrders
{
/// <summary>
/// Provides application-specific behavior to supplement the default Application class.
/// </summary>
sealed partial class App : Application
{
public static ITutorialRepository Repository { get; set; }
/// <summary>
/// Initializes the singleton application object. This is the first line of authored code
/// executed, and as such is the logical equivalent of main() or WinMain().
/// </summary>
public App()
{
this.InitializeComponent();
this.Suspending += OnSuspending;
}
/// <summary>
/// Invoked when the application is launched normally by the end user. Other entry points
/// will be used such as when the application is launched to open a specific file.
/// </summary>
/// <param name="e">Details about the launch request and process.</param>
protected override void OnLaunched(LaunchActivatedEventArgs e)
{
UseSqlite();
Frame rootFrame = Window.Current.Content as Frame;
// Do not repeat app initialization when the Window already has content,
// just ensure that the window is active
if (rootFrame == null)
{
// Create a Frame to act as the navigation context and navigate to the first page
rootFrame = new Frame();
rootFrame.NavigationFailed += OnNavigationFailed;
if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
{
//TODO: Load state from previously suspended application
}
// Place the frame in the current Window
Window.Current.Content = rootFrame;
}
if (e.PrelaunchActivated == false)
{
if (rootFrame.Content == null)
{
// When the navigation stack isn't restored navigate to the first page,
// configuring the new page by passing required information as a navigation
// parameter
rootFrame.Navigate(typeof(CustomerListPage), e.Arguments);
}
// Ensure the current window is active
Window.Current.Activate();
}
}
public static void UseSqlite()
{
string demoDatabasePath = Package.Current.InstalledLocation.Path + @"\Assets\Repository.db";
string databasePath = ApplicationData.Current.LocalFolder.Path + @"\Repository.db";
if (!File.Exists(databasePath))
{
File.Copy(demoDatabasePath, databasePath);
}
var dbOptions = new DbContextOptionsBuilder<CustomerContext>().UseSqlite("Data Source=" + databasePath);
Repository = new SqlTutorialRepository(dbOptions);
}
public async Task CopyDatabase()
{
bool isDatabaseExisting = false;
try
{
StorageFile storageFile = await ApplicationData.Current.LocalFolder.GetFileAsync("Repository.db");
isDatabaseExisting = true;
}
catch
{
isDatabaseExisting = false;
}
if (!isDatabaseExisting)
{
StorageFile databaseFile = await Package.Current.InstalledLocation.GetFileAsync("Repository.db");
await databaseFile.CopyAsync(ApplicationData.Current.LocalFolder);
}
}
/// <summary>
/// Invoked when Navigation to a certain page fails
/// </summary>
/// <param name="sender">The Frame which failed navigation</param>
/// <param name="e">Details about the navigation failure</param>
void OnNavigationFailed(object sender, NavigationFailedEventArgs e)
{
throw new Exception("Failed to load Page " + e.SourcePageType.FullName);
}
/// <summary>
/// Invoked when application execution is being suspended. Application state is saved
/// without knowing whether the application will be terminated or resumed with the contents
/// of memory still intact.
/// </summary>
/// <param name="sender">The source of the suspend request.</param>
/// <param name="e">Details about the suspend request.</param>
private void OnSuspending(object sender, SuspendingEventArgs e)
{
var deferral = e.SuspendingOperation.GetDeferral();
//TODO: Save application state and stop any background activity
deferral.Complete();
}
}
}
// SqlTutorialRepository.cs
using CustomerOrders.Models;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace CustomerOrders.Repository
{
public class SqlTutorialRepository : ITutorialRepository
{
private DbContextOptions<CustomerContext> _dbOptions;
public SqlTutorialRepository(DbContextOptionsBuilder<CustomerContext> dbOptionsBuilder)
{
_dbOptions = dbOptionsBuilder.Options;
using(var db = new CustomerContext(_dbOptions))
{
db.Database.EnsureCreated();
}
}
public ICustomerRepository Customers => new SqlCustomerRepository(new CustomerContext(_dbOptions));
}
}
使用CustomerOrders.Models;
使用CustomerOrders.Repository;
使用CustomerOrders.Views;
使用Microsoft.EntityFrameworkCore;
使用制度;
使用System.Collections.Generic;
使用System.IO;
使用System.Linq;
使用System.Runtime.InteropServices.WindowsRuntime;
使用System.Threading.Tasks;
使用Windows.ApplicationModel;
使用Windows.ApplicationModel.Activation;
使用Windows基金会;
使用Windows。
使用Windows.Storage;
使用Windows.UI.Xaml;
使用Windows.UI.Xaml.Controls;
使用Windows.UI.Xaml.Controls.Primitives;
使用Windows.UI.Xaml.Data;
使用Windows.UI.Xaml.Input;
使用Windows.UI.Xaml.Media;
使用Windows.UI.Xaml.Navigation;
命名空间自定义顺序
{
///
///提供特定于应用程序的行为以补充默认应用程序类。
///
密封部分类应用程序:应用程序
{
公共静态ITutorialRepository存储库{get;set;}
///
///初始化singleton应用程序对象。这是编写代码的第一行
///已执行,因此是main()或WinMain()的逻辑等价物。
///
公共应用程序()
{
this.InitializeComponent();
这个.Suspending+=OnSuspending;
}
///
///当最终用户正常启动应用程序时调用。其他入口点
///将在启动应用程序以打开特定文件时使用。
///
///有关启动请求和过程的详细信息。
仅启动受保护的覆盖无效(启动ActivatedEventArgs e)
{
UseSqlite();
Frame rootFrame=Window.Current.Content作为Frame;
//当窗口已经有内容时,不要重复应用程序初始化,
//只需确保窗口处于活动状态
if(rootFrame==null)
{
//创建一个框架作为导航上下文并导航到第一页
rootFrame=新框架();
rootFrame.NavigationFailed+=OnNavigationFailed;
如果(例如,PreviousExecutionState==ApplicationExecutionState.Terminated)
{
//TODO:从先前挂起的应用程序加载状态
}
//将框架放置在当前窗口中
Window.Current.Content=rootFrame;
}
如果(如预启动激活==错误)
{
if(rootFrame.Content==null)
{
//导航堆栈未还原时,请导航到第一页,
//通过将所需信息作为导航传递来配置新页面
//参数
导航(typeof(CustomerListPage),例如参数);
}
//确保当前窗口处于活动状态
Window.Current.Activate();
}
}
公共静态void UseSqlite()
{
字符串demoDatabasePath=Package.Current.InstalledLocation.Path+@“\Assets\Repository.db”;
字符串databasePath=ApplicationData.Current.LocalFolder.Path+@“\Repository.db”;
如果(!File.Exists(databasePath))
{
复制(数据库路径、数据库路径);
}
var dbOptions=new DbContextOptionsBuilder().UseSqlite(“数据源=“+databasePath”);
Repository=新的SqlTutorialRepository(dbOptions);
}
公共异步任务CopyDatabase()
{
bool isDatabaseExisting=false;
尝试
{
StorageFile StorageFile=Wait ApplicationData.Current.LocalFolder.GetFileAsync(“Repository.db”);
isDatabaseExisting=true;
}
抓住
{
isDatabaseExisting=false;
}
如果(!isDatabaseExisting)
{
StorageFile databaseFile=await Package.Current.InstalledLocation.GetFileAsync(“Repository.db”);
等待databaseFile.copyanc(ApplicationData.Current.LocalFolder);
}
}
///
///当导航到某个页面失败时调用
///
///导航失败的帧
///有关导航失败的详细信息
void OnNavigationFailed(对象发送方,NavigationFailedEventArgs e)
{
抛出新异常(“加载页面失败”+e.SourcePageType.FullName);
}
///
///在挂起应用程序执行时调用。应用程序状态已保存
///不知道应用程序是否会随内容一起终止或恢复
///记忆仍然完好无损。
///
///挂起请求的源。
///有关暂停请求的详细信息。
暂停时的私有void(对象发送方,SuspendingEventArgs e)
{
var deleral=e.SuspendingOperation.getdeleral();
//TODO:保存应用程序状态并停止任何后台活动
延迟。完成();
}
}
}
//SqlTutorialRepository.cs
使用CustomerOrders.Models;
使用Microsoft.EntityFrameworkCore;
使用制度;
使用System.Collections.Generic;
使用System.Linq;
使用系统文本;
使用System.Threading.Tasks;
命名空间CustomerOrders.Repo