我創建了一個名為 Student 的類，Program.cs 中有以下代碼：public static IList<Student> Students { get; private set; }private static void AddStudent() { /*try { Console.Write("First name: "); //Students.FirstName = Console.ReadLine(); string firstName = Console.ReadLine(); } catch (ArgumentNullException) { Console.WriteLine("Name was left empty."); }*/ Console.Write("First name: "); string firstName = Console.ReadLine(); Console.Write("Last name: "); string lastName = Console.ReadLine(); var newStudent = new Student {FirstName = firstName, LastName = lastName}; //if I use try-catch block, it says: The name 'firstName' doesn't exist in the current context Students.Add(newStudent); Console.WriteLine("The new student is added. \nEnter any key to return to main screen."); Console.ReadKey();}public static void SortStudents(IList<Student> students) { string temp; for (int i = 0; i < students.Count; i++) { for (int j = 0; j < students.Count; j++) { if (string.Compare(students[i].ToString(), students[j].ToString()) < 0) { //swap temp = students[i].ToString(); students[i] = students[j]; students[j] = temp; //error here } } } Console.WriteLine(students); }學生班：public class Student{ public string FirstName { get; set; } public string LastName { get; set; } public int Age { get; set; } public string StudentNumber { get; set; } public string Gender { get; set; } public string FieldOfStudy { get; set; }}我正在嘗試實現一種算法，該算法將按字母順序對輸入的名稱進行排序，但它會在那里拋出錯誤。我該如何解決？我也在嘗試使用 try-catch 塊，但它拋出了我在代碼中評論過的錯誤。提前致謝！
2 回答
忽然笑
TA貢獻1806條經驗 獲得超5個贊
正如一些評論員指出的那樣，您可能需要訪問Student和比較它們的屬性，然后交換對象。
所以像這樣：
public static void SortStudents(IList<Student> students)
{
//We change this to Type Student, not string.
Student temp;
for (int i = 0; i < students.Count; i++)
{
for (int j = 0; j < students.Count; j++)
{
//We look at the Properties of the object, not the Object.ToString()
if (string.Compare(students[i].FirstName, students[j].FirstName) < 0)
{
//Here we are swapping the objects, because we have determined
//Their first names aren't in alphabetical order.
temp = students[i];
students[i] = students[j];
students[j] = temp;
}
}
}
//For loop, or Foreach loop here to iterate through your collection (ILIST)
}
收到一只叮咚
TA貢獻1821條經驗 獲得超5個贊
是否有某種原因導致Student該類無法通過實現IComparable接口來實現這種“排序”邏輯？使用 aList<Student>來保存Student對象將使用此CompareTo方法對對象進行“排序”。這將允許類以任何你想要的方式“排序”。在這種情況下，它按姓氏然后按名字排序。你試過這樣做嗎？它可能看起來像下面...
public class Student : IComparable {
public string FirstName { get; set; }
public string LastName { get; set; }
public int Age { get; set; }
public string StudentNumber { get; set; }
public string Gender { get; set; }
public string FieldOfStudy { get; set; }
public int CompareTo(object obj) {
Student that = (Student)obj;
if (this.LastName.Equals(that.LastName))
return this.FirstName.CompareTo(that.FirstName);
return this.LastName.CompareTo(that.LastName);
}
}
然后，“排序” aList<Student>將只是......
Students.Sort();
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