Sqlite EF CodeFirst For WPF

在WPF 开发中使用Sqlite 数据库的EF框架

1.安装必要的插件

  install-package System.Data.Sqliteinstall-package System.Data.Sqlite.EF6install-package Sqlite.CodeFirst

2.建立数据模型

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.ComponentModel.DataAnnotations;
namespace WpfApp4.Models
{public class Student{[Key]public int Id { get; set; }public string Name { get; set; }}
}

3.建立数据上下文

using SQLite.CodeFirst;
using System.Data.Entity;
namespace WpfApp4.Models
{public class MyDbContext: DbContext{public MyDbContext() : base("name=MyConnection") { }public DbSet<Student> Students { get; set; }protected override void OnModelCreating(DbModelBuilder modelBuilder){base.OnModelCreating(modelBuilder);var init = new SqliteCreateDatabaseIfNotExists<MyDbContext>(modelBuilder);Database.SetInitializer(init);}}
}

4.配置文件

<?xml version="1.0" encoding="utf-8" ?>
<configuration><configSections><!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 --><section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" /></configSections><startup> <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8" /></startup><entityFramework><providers><provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" /><provider invariantName="System.Data.SQLite.EF6" type="System.Data.SQLite.EF6.SQLiteProviderServices, System.Data.SQLite.EF6" /><!--增加下面这行（复制上面一行，去掉EF6）--><provider invariantName="System.Data.SQLite" type="System.Data.SQLite.EF6.SQLiteProviderServices, System.Data.SQLite.EF6" /></providers></entityFramework><system.data><DbProviderFactories><remove invariant="System.Data.SQLite.EF6" /><add name="SQLite Data Provider (Entity Framework 6)" invariant="System.Data.SQLite.EF6" description=".NET Framework Data Provider for SQLite (Entity Framework 6)" type="System.Data.SQLite.EF6.SQLiteProviderFactory, System.Data.SQLite.EF6" /><remove invariant="System.Data.SQLite" /><add name="SQLite Data Provider" invariant="System.Data.SQLite" description=".NET Framework Data Provider for SQLite" type="System.Data.SQLite.SQLiteFactory, System.Data.SQLite" /></DbProviderFactories></system.data><!--增加下面的数据库连接配置信息--><connectionStrings><add name="MyConnection" connectionString="Data Source=.\mydb.db" providerName="System.Data.SQLite.EF6"/></connectionStrings>
</configuration>

5.使用方法

using System.Data.Entity.Infrastructure;
using System.Windows;
using WpfApp4.Models;namespace WpfApp4
{/// <summary>/// MainWindow.xaml 的交互逻辑/// </summary>public partial class MainWindow : Window{public MainWindow(){InitializeComponent();using (var db = new MyDbContext()){db.Students.Add(new Student() {Name="Test1"});try{db.SaveChanges();MessageBox.Show("Success！");}catch (DbUpdateException ex){MessageBox.Show(ex.InnerException.Message);}}}}
}

• 注意事项

（1）当前系统和sqlite 动态库版本要一致，如x86/x64

(2) 当前系统程序和使用的动态库版本要一致