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

下面用这种CodeFirst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ID
        public 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