EF4.0和EF5.0增删改查的写法区别 （原文）
public T AddEntity(T entity)
{
//EF4.0的写法
添加实体
//db.CreateObjectSet<T>().AddObject(entity);
//EF5.0的写法
db.Entry<T>(entity).State = EntityState.Added;
//下面的写法统一
db.SaveChanges();
return entity;
}
public bool UpdateEntity(T entity)
{
//EF4.0的写法
//db.CreateObjectSet<T>().Addach(entity);
//db.ObjectStateManager.ChangeObjectState(entity, EntityState.Modified);
//EF5.0的写法
db.Set<T>().Attach(entity);
db.Entry<T>(entity).State = EntityState.Modified;
return db.SaveChanges() > 0;
}
public bool DeleteEntity(T entity)
{
//EF4.0的写法
//db.CreateObjectSet<T>().Addach(entity);
//db.ObjectStateManager.ChangeObjectState(entity, EntityState.Deleted);
//EF5.0的写法
db.Set<T>().Attach(entity);
db.Entry<T>(entity).State = EntityState.Deleted;
return db.SaveChanges() > 0;
}
public IQueryable<T> LoadEntities(Func<T, bool> whereLambda)
{
//EF4.0的写法
//return
db.CreateObjectSet<T>().Where<T>(whereLambda).AsQueryable();
//EF5.0的写法
return db.Set<T>().Where<T>(whereLambda).AsQueryable();
}
执行SQL语句
//EF4.0的写法
//int
ExcuteSql(string strSql, ObjectParameter[] parameters);
return EFContextFactory.GetCurrentDbContext().ExecuteFunction(strSql, parameters);
//EF5.0的写法
int ExcuteSql(string strSql,
DbParameter[] parameters);
return DEFContextFactory.GetCurrentDbContext().ExecuteSqlCommand(strSql, parameters);