EF的增刪改查：
using System;
using System.Collections.Generic;
using System.Data.Entity.Infrastructure;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks;
namespace Dal
{
publicclassStudentsDal
{
zzEntities zzDB = new zzEntities();
publicintAdd(Student model)
{
zzDB.Students.Add(model);
returnzzDB.SaveChanges();
}
publicintDeleteStu(Student model) {
zzDB.Students.Attach(model);
zzDB.Students.Remove(model);
returnzzDB.SaveChanges();
}
publicintUpdateStu(Student model,string[]propertys) {
DbEntityEntry dbEE = zzDB.Entry(model);
dbEE.State = System.Data.EntityState.Unchanged;
foreach(var pro inpropertys)
{
dbEE.Property(pro).IsModified = true;
}
returnzzDB.SaveChanges();
}
publicintDeleteStuBy(Expression<Func<Student,bool>>delWhere) {
List<Student>stuList = zzDB.Students.Where(delWhere).ToList();
stuList.ForEach(stu =>zzDB.Students.Remove(stu));
returnzzDB.SaveChanges();
}
publicList<Student>GetListBy(Expression<Func<Student,bool>>stuWhere) {
return zzDB.Students.Where(stuWhere).ToList();
}
publicList<Student>GetPageList<Tkey>(intPageIndex,int PageSize,Expression<Func<Student,bool>>stuwhere,Expression<Func<Student,Tkey>> orderBy ) {
returnzzDB.Students.Where(stuwhere).OrderBy(orderBy).Skip((PageIndex-1)*PageSize).Take(PageSize).ToList();
}
}
}