static void Delete()
{
ClassBusinessLayer cbl = new ClassBusinessLayer();
Console.WriteLine("请输入一个班级的id");
int id = int.Parse(Console.ReadLine());
Class classes = cbl.Query(id);
cbl.Delete(classes);
}
//删除
static void Delete()
{
ClassBusinessLayer bbl = new ClassBusinessLayer();
Console.Write("请输入删除班级id");
int id = int.Parse(Console.ReadLine());
Clas clas = bbl.Query(id);
bbl.Delete(clas);
}