public void Add2()
{
TblStudent stu = new TblStudent();
stu.FirstName = "Shadow";
stu.LastName = "Sun";
stu.Age = 20;
if (db.TblStudent.Where <TblStudent>(s => (s.FirstName + s.LastName) == (stu.FirstName + stu.LastName)).Count() > 0)
{
Console.WriteLine($"重复姓名：{stu.FirstName} {stu.LastName}");
}
else
{
db.TblStudent.Add(stu);
db.SaveChanges();
Console.WriteLine($"新增学生：{stu.FirstName} {stu.LastName}");
}
}
public void Add()
{
TblStudent stu = new TblStudent();
stu.FirstName = "Shadow";
stu.LastName = "Moon";
stu.Age = 20;
if (db.TblStudent.Where <TblStudent>(s => (s.FirstName + s.LastName) == (stu.FirstName + stu.LastName)).Count() > 0)
{
Console.WriteLine($"重复姓名：{stu.FirstName} {stu.LastName}");
}
else
{
//方法一：
//sde.TblStudent.Add(stu);
//方法二:
db.Entry(stu).State = System.Data.Entity.EntityState.Added;
db.SaveChanges();
Console.WriteLine($"新增学生：{stu.FirstName} {stu.LastName}");
}
}