EFCore -CodeFirst模式 数据库使用SqLite

首先安装nuget包：System.Data.SQLite 和 SQLite.CodeFirst，如下二图:

然后在App.config中配置数据库连接字符串：

<connectionStrings><add name="StuDB" connectionString="data source=BoilerCalculator.db" providerName="System.Data.SQLite.EF6" />
</connectionStrings>

下面用这种方式实现WPF对学生信息的数据管理(效果图如下）

一：创建实体类Students

using System;
using System.ComponentModel.DataAnnotations.Schema;namespace EFCoreDemo.Models
{[Table("StudentManager")]//映射SqLite的表格public class Students{//学生IDpublic int Id { get; set; }//学生名称public string StudentName { get; set; }//学生性别public string Gender { get; set; }//学生出生年月public DateTime Birthday { get; set; }//学生地址public string Address { get; set; }//家长电话public string PatriarchTel { get; set; }}
}

二：studentContext数据库关系映射类：

using EFCoreDemo.Models;
using SQLite.CodeFirst;
using System.Data.Entity;namespace EFCoreDemo
{public class StudentContext:DbContext{public StudentContext() : base("StuDB"){}protected override void OnModelCreating(DbModelBuilder modelBuilder){var intit = new SqliteCreateDatabaseIfNotExists<StudentContext>(modelBuilder);Database.SetInitializer(intit);Database.SetInitializer(new SqliteDropCreateDatabaseWhenModelChanges<StudentContext>(modelBuilder));modelBuilder.Entity<Students>();base.OnModelCreating(modelBuilder);}//映射类public DbSet<Students> StudentsData { get; set; }}
}

三：封装的增删改查方法类

using EFCoreDemo.DB;
using EFCoreDemo.Models;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;namespace EFCoreDemo
{public static class EFCoreHelper{private static StudentContext _studentContext = new StudentContext();public static StudentContext studentContext  { get => _studentContext; set => _studentContext = value; }//查询所有学生数据public static ObservableCollection<Students> GetStudents(){var list=studentContext.StudentsData.ToList();return new ObservableCollection<Students>(list);}//添加新的学生信息public static int InsertStu(Students students){try{studentContext.StudentsData.Add(students);studentContext.SaveChanges();return 0;}catch(Exception ex){MessageBox.Show(ex.Message);return -1;}}//修改学生信息public static int UpdateStu(Students students){try{var id = studentContext.StudentsData.Find(students.Id);var entry = studentContext.Entry(id);entry.CurrentValues.SetValues(students);entry.Property(p => p.Id).IsModified = false;studentContext.SaveChanges();return 0;}catch{return -1;}}//删除学生信息public static void RemoveStu(int ID){Students student = GetStudentWithID(ID);studentContext.StudentsData.Remove(student);studentContext.SaveChanges();}//学生信息关键字查询public static List<Students> CheckStudentWithKey(string StuName){return studentContext.StudentsData.Where(p => p.StudentName == StuName).ToList();}//学生信息ID查询public static Students GetStudentWithID(int ID){return studentContext.StudentsData.FirstOrDefault(p => p.Id == ID);}}
}

之后就可以调用封装类EFCoreHelper里的方法完成增删改查了。具体调用方法参考以下链接。不同之处是原博主使用的是SQLServer数据库,我这边使用的是SQLite数据库，其它都可以参考以下链接的文章。
https://blog.csdn.net/m0_47274301/article/details/118878005