我创建了一个应用程序，您可以将学生和讲师添加到每个列表中，我需要搜索列表以按名称或ID查找学生或讲师。但是，当我循环遍历列表以查找匹配的字符串时，它将找到匹配的字符串并打印详细信息，但是对于列表中的每个其他成员，将触发说明未找到学生的else语句。我尝试在if语句后暂停，但它仍然发生。我该如何解决这个问题？
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace DBSManagement
{
class College: Staff
{
public static List<Student> students = new List<Student>();
public static List<Lecturer> lecturers = new List<Lecturer>();
static void Main()
{
int choice;
bool seeAgain = true;
do
{
Console.WriteLine("Press");
Console.WriteLine("1: To add a student");
Console.WriteLine("2: To add a lecturer");
Console.WriteLine("3: To search for a lecturer or student");
Console.WriteLine("4: To show the details of all enrolled students");
Console.WriteLine("5: To show the names of all lecturers");
Console.WriteLine("6: To show payroll details for a lecturer");
Console.WriteLine("7: To quit");
int.TryParse(Console.ReadLine(), out choice);
switch (choice)
{
case 1:
AddStudent();
break;
case 2:
AddLecturer();
break;
case 3:
SearchPerson();
break;
case 4:
ShowStudents();
break;
case 5:
ShowLecturers();
break;
case 6:
ShowPayrollDetails();
break;
case 7:
seeAgain = false;
break;
default:
Console.WriteLine("Invalid option selected");
break;
}
} while (seeAgain);
}
public static void AddStudent()
{
Student student = new Student();
Console.WriteLine("Enter student name:");
student.Name = Console.ReadLine();
Console.WriteLine("Enter student address:");
student.Address = Console.ReadLine();
Console.WriteLine("Enter student phone number:");
student.Phone = Console.ReadLine();
Console.WriteLine("Enter student email:");
student.Email = Console.ReadLine();
Console.WriteLine("Enter student PPSN:");
student.PPSN = Console.ReadLine();
Console.WriteLine("Enter student status (postgrad or undergrad):");
EnterStat:
string stat = Console.ReadLine().ToLower();
if (stat == "postgrad" || stat == "undergrad")
{
student.Status = (Status)Enum.Parse(typeof(Status), stat);
}
else
{
Console.WriteLine("Please enter either postgrad or undergrad:");
goto EnterStat;
}
Console.WriteLine("Enter student ID:");
int inStudentID;
int.TryParse(Console.ReadLine(), out inStudentID);
student.StudentID = inStudentID;
students.Add(student);
}
public static void AddLecturer()
{
Lecturer lecturer = new Lecturer();
Console.WriteLine("Enter lecturer name:");
lecturer.Name = Console.ReadLine();
Console.WriteLine("Enter lecturer address:");
lecturer.Address = Console.ReadLine();
Console.WriteLine("Enter lecturer phone number:");
lecturer.Phone = Console.ReadLine();
Console.WriteLine("Enter lecturer email:");
lecturer.Email = Console.ReadLine();
Console.WriteLine("Enter lecturer PPSN:");
lecturer.PPSN = Console.ReadLine();
Console.WriteLine("Enter lecturer ID:");
lecturer.ID = Console.ReadLine();
Console.WriteLine("Enter salary:");
lecturer.Salary = decimal.Parse(Console.ReadLine());
Console.WriteLine("Enter subject taught:");
lecturer.SubjectTaught = Console.ReadLine().ToLower();
lecturers.Add(lecturer);
}
public static void SearchPerson()
{
int searchChoice = 0;
int studentSearch = 0;
int lecturerSearch = 0;
Console.WriteLine("Press:");
Console.WriteLine("1 to search for a student");
Console.WriteLine("2 to search for a lecturer");
int.TryParse(Console.ReadLine(), out searchChoice);
switch (searchChoice)
{
//search students
case 1:
Console.WriteLine("Press:");
Console.WriteLine("1 to search by name");
Console.WriteLine("2 to search by student number");
int.TryParse(Console.ReadLine(), out studentSearch);
switch (studentSearch)
{
case 1:
Console.WriteLine("Enter student name:");
string studentNameSearch = Console.ReadLine();
foreach (Student student in students)
//(int i = 0; i < students.Count; i++)
{
if (student.Name.Contains(studentNameSearch))
{
Console.WriteLine(student.ToString());
break;
}
else
{
Console.WriteLine("Student name not found");
}
}
break;
case 2:
int studentIDSearch;
Console.WriteLine("Enter student number:");
int.TryParse(Console.ReadLine(), out studentIDSearch);
for (int i = 0; i < students.Count; i++)
{
if (students[i].StudentID == studentIDSearch)
{
Console.WriteLine(students[i].ToString());
}
else
{
Console.WriteLine("Student number not found");
}
}
break;
default:
Console.WriteLine("Invalid option selected");
break;
}
break;
//search lecturers
case 2:
Console.WriteLine("Press:");
Console.WriteLine("1 to search by name");
Console.WriteLine("2 to search by course taught");
int.TryParse(Console.ReadLine(), out lecturerSearch);
switch (lecturerSearch)
{
case 1:
Console.WriteLine("Enter lecturer name:");
string lecturerNameSearch = Console.ReadLine();
for (int i = 0; i < lecturers.Count; i++)
{
if (lecturers[i].Name == lecturerNameSearch)
{
Console.WriteLine(lecturers[i].ToString());
}
else
{
Console.WriteLine("Lecturer name not found");
}
}
break;
case 2:
Console.WriteLine("Enter course taught:");
string lecturerSubjectSearch = Console.ReadLine().ToLower();
for (int i = 0; i < lecturers.Count; i++)
{
if (lecturers[i].SubjectTaught == lecturerSubjectSearch)
{
Console.WriteLine(lecturers[i].ToString());
}
else
{
Console.WriteLine("Subject not found");
}
}
break;
default:
Console.WriteLine("Invalid option selected");
break;
}
break;
default:
Console.WriteLine("Invalid option selected");
break;
}
}
public static void ShowStudents()
{
//sort list by name
List<Student> SortedStudents = students.OrderBy(o => o.Name).ToList();
foreach (Student student in SortedStudents)
{
Console.WriteLine(student);
}
}
public static void ShowLecturers()
{
//sort list by name
List<Lecturer> SortedLecturers = lecturers.OrderBy(o => o.Name).ToList();
foreach (Lecturer lecturer in SortedLecturers)
{
Console.WriteLine(lecturer.Name);
}
}
public static void ShowPayrollDetails()
{
Console.WriteLine("Enter lecturer name:");
string lecturerNameSearch = Console.ReadLine();
for (int i = 0; i < lecturers.Count; i++)
{
if (lecturers[i].Name == lecturerNameSearch)
{
Console.WriteLine(lecturers[i].PayrollDetails());
}
else
{
Console.WriteLine("Lecturer name not found");
}
}
}
}
}
答案 0 :(得分：2)
试试这个
Boolean found = false;
foreach (Student student in students)
//(int i = 0; i < students.Count; i++)
{
if (student.Name.Contains(studentNameSearch))
{
Console.WriteLine(student.ToString());
found = true;
break;
}
}
if(found == false)
{
Console.WriteLine("Student name not found");
}
答案 1 :(得分：1)
您的代码会为列表中的每个元素student输出“找不到学生名称”
student.Name.Contains(studentNameSearch)和在搜索整个列表后，您只能确定没有符合条件的学生。
可能的解决方案：
Student studentMatch = null;
foreach (Student student in students)
{
if (student.Name.Contains(studentNameSearch))
{
studentMatch = student;
break;
}
}
if (studentMatch == null)
{
Console.WriteLine("Student name not found");
}
else
{
Console.WriteLine(studentMatch.ToString());
}