static void Main(string[] args)
{
StudentC studentC = new StudentC();
studentC.Name = "Jane";
ByValueTestClass(studentC); // passed by ref
Console.WriteLine(studentC.Name); // Prints - Jane-ByValue
ByReferenceTestClass(ref studentC); // passed by ref - ref keyword is redundant
Console.WriteLine(studentC.Name); // Prints - Jane-ByValue-ByReference
//--
StudentS studentS = new StudentS();
studentS.Name = "John";
ByValueTestStruct(studentS); // passed by value
Console.WriteLine(studentS.Name); // Prints - John
ByReferenceTestStruct(ref studentS); // passed by ref
Console.WriteLine(studentS.Name); // Prints - John-ByReference
//-
Console.ReadKey();
}
public ActionResult Update(StudentS s)
{
try
{
Student st = new Student()
{
CardID = s.CardID,
Address = "",
Borndate = DateTime.Now,
ClassID = Convert.ToInt32(s.ClassName),
Email = "",
Gender = false,
Phone = "",
CreateTime = DateTime.Now,
StudentName = s.StudentName,
Password = s.Password,
Shan = false,
StudentID = s.StudentID
};
ef.Entry(st).State = EntityState.Modified;
if (ef.SaveChanges() > 0)
{
return(Content("修改成功"));
}
return(Content(""));
}
catch (Exception ex)
{
return(Content("身份证号已经存在了"));
}
}
public ActionResult ADD(StudentS s)
{
try
{
ef.Configuration.EnsureTransactionsForFunctionsAndCommands = false;
if (ef.Students.Any(x => x.CardID == s.CardID.Trim()))
{
if (ef.Students.FirstOrDefault(x => x.CardID == s.CardID && x.Shan == true) != null)
{
Student tae = ef.Students.FirstOrDefault(x => x.CardID == s.CardID);
tae.StudentName = s.StudentName;
tae.Shan = false;
tae.ClassID = Convert.ToInt32(s.ClassName);
tae.Password = s.Password;
ef.Entry(tae).State = EntityState.Modified;
if (ef.SaveChanges() > 0)
{
return(Content("增加成功"));
}
}
else
{
return(Content("已经存在了"));
}
}
else
{
Student st = new Student()
{
CardID = s.CardID,
Address = "",
Borndate = DateTime.Now,
ClassID = Convert.ToInt32(s.ClassName),
Email = "",
Gender = false,
Phone = "",
CreateTime = DateTime.Now,
StudentName = s.StudentName,
Password = s.Password,
Shan = false,
};
ef.Entry(st).State = EntityState.Added;
if (ef.SaveChanges() > 0)
{
return(Content("增加成功"));
}
}
return(Content("失败"));
}
catch (Exception ex)
{
return(Content(ex.ToString()));
}
}
public static void StudentSByEmail()
{
var input = Console.ReadLine();
var students = new List <StudentS>();
while (!input.Equals("END"))
{
var studentInfo = input.Split();
var firstName = studentInfo[0];
var lastName = studentInfo[1];
var email = studentInfo[2];
var currentStudent = new StudentS(firstName, lastName, email);
students.Add(currentStudent);
input = Console.ReadLine();
}
students.Where(s => s.Email.EndsWith("@gmail.com")).ToList().ForEach(s => Console.WriteLine($"{s.FirstName} {s.LastName}"));
}
public static void StudentsByPhone()
{
var input = Console.ReadLine();
var students = new List <StudentS>();
while (!input.Equals("END"))
{
var studentInfo = input.Split();
var firstName = studentInfo[0];
var lastName = studentInfo[1];
var phone = studentInfo[2];
var currentStudent = new StudentS(firstName, lastName, phone);
students.Add(currentStudent);
input = Console.ReadLine();
}
students.Where(s => s.Email.StartsWith("02") || s.Email.StartsWith("+3592")).ToList().ForEach(s => Console.WriteLine($"{s.FirstName} {s.LastName}"));
}
public string ReadAll()
{
SchoolEntity school = new SchoolEntity();
List <StudentS> studentS = new List <StudentS>();
StudentS stu = null;
foreach (var s in school.Students)
{
stu = new StudentS
{
IdStudent = s.StudentId,
NameStudent = s.StudentName
};
studentS.Add(stu);
}
string jsonStudents = JsonConvert.SerializeObject(studentS);
return(jsonStudents);
}
static void ByValueTestStruct(StudentS student)
{
student.Name += "-ByValue";
}
static void ByReferenceTestStruct(ref StudentS student)
{
student.Name += "-ByReference";
}
