有一个LoadStudents方法将带有某些字段的对象写入Student类数组。有必要开发一种方法（我尝试过，称为Add），可以使用三个方法TextBoxes和保存该按钮的按钮代码来执行此过程。数据。
public partial class Form1 : Form
{
public static int k=0;
Student[] mas = new Student[3];
public Form1()
{
InitializeComponent();
}
public delegate int CompareHealth(Student o1, Student o2);
public class Student
{
public string name = "";
public int days = 0;
public int hemoglobin = 0;
public Student() { }
public Student(string name, int days, int hemoglobin)
{
this.name = name;
this.days = days;
this.hemoglobin = hemoglobin;
}
public Student(Student s)
{
name = s.name;
days = s.days;
hemoglobin = s.hemoglobin;
}
public string add
{
set { name = value; }
get { return name; }
}
private static int CompareName(Student o1, Student o2)
{
return (string.Compare(o1.name, o2.name));
}
private static int CompareDays(Student o1, Student o2)
{
if (o1.days > o2.days) return (1);
else if (o1.days < o2.days) return (-1);
else return (0);
}
private static int CompareHemoglobin(Student o1, Student o2)
{
if (o1.hemoglobin > o2.hemoglobin) return (1);
else if (o1.hemoglobin < o2.hemoglobin) return (-1);
else return (0);
}
public static CompareHealth SortByName { get { return (new CompareHealth(CompareName)); } }
public static CompareHealth SortByDays { get { return (new CompareHealth(CompareDays)); } }
public static CompareHealth SortByHemoglobin { get { return (new CompareHealth(CompareHemoglobin)); } }
}
class Students
{
private int items = 0; const int n = 10;
private Student[] students = new Student[n];
public Student this[int num]
{
get { return (students[num - 1]); }
set { (students[num - 1]) = value; }
}
public void Vivod(ListBox h)
{
for (int i = 0; i < items; i++)
{
h.Items.Add(students[i].name + " " + students[i].days + " " + students[i].hemoglobin + " ");
}
}
public void LoadStudents()
{
Student p = new Student("А", 13, 68);
students[items++] = p;
Student w = new Student("Б", 18, 67);
students[items++] = w;
Student e = new Student("В", 5, 75);
students[items++] = e;
}
public void Add(TextBox t1, TextBox t2, TextBox t3)
{
if (k < 3)
{
Student load = new Student();
students[items++] = load;
k++;
}
}
public void SortStudent(CompareHealth compare)
{
Student temp = new Student();
for (int i = 1; i < items; i++)
for (int j = items - 1; j >= i; j--)
if (compare(students[j], students[j - 1]) == -1)
{ temp = students[j - 1]; students[j - 1] = students[j]; students[j] = temp; }
}
}
private void button2_Click(object sender, EventArgs e)
{
listBox1.Items.Clear();
Students students = new Students();
students.SortStudent(Student.SortByName);
students.Vivod(listBox1);
}
private void button1_Click(object sender, EventArgs e)
{
Students students = new Students();
students.Add(textBox1, textBox2, textBox3);
}
问题在于，一个按钮包含Add方法，另一个按钮再次（排序），您需要指定对对象student的引用，并且据我所知，该数组被重置。如何为按钮正确编写代码？
答案 0 :(得分：0)
我可以重写您的课程，以使它们更加惯用。让我知道这里是否有任何需要解释的地方。
public partial class Form1 : Form
{
private Students _students = new Students();
public Form1()
{
InitializeComponent();
}
private void button2_Click(object sender, EventArgs e)
{
_students.Sort(Students.SortByName);
this.Vivod(listBox1);
}
private void button1_Click(object sender, EventArgs e)
{
_students.Add(new Student(textBox1.Text, int.Parse(textBox2.Text), int.Parse(textBox3.Text)));
}
private void Vivod(ListBox listBox)
{
listBox.Items.Clear();
listBox.Items.AddRange(_students.ToStrings());
}
}
public class Students
{
private int _items = 0;
private const int __n = 10;
private Student[] students = new Student[__n];
public Student this[int num]
{
get => students[num - 1];
set { (students[num - 1]) = value; }
}
public string[] ToStrings() => Enumerable.Range(0, _items).Select(i => students[i].ToString() + " ").ToArray();
public void LoadStudents()
{
this.Add(new Student("А", 13, 68));
this.Add(new Student("Б", 18, 67));
this.Add(new Student("В", 5, 75));
}
public void Add(Student load)
{
if (_items < __n)
{
students[_items++] = load;
}
}
public void Sort(IComparer<Student> comparer)
{
Array.Sort(students, comparer);
}
private class SortByNameComparer : IComparer<Student>
{
public int Compare(Student o1, Student o2) => string.Compare(o1.Name, o2.Name);
}
private class SortByDaysComparer : IComparer<Student>
{
public int Compare(Student o1, Student o2) => o1.Days > o2.Days ? 1 : (o1.Days < o2.Days ? -1 : 0);
}
private class SortByHemoglobinComparer : IComparer<Student>
{
public int Compare(Student o1, Student o2) => o1.Hemoglobin > o2.Hemoglobin ? 1 : (o1.Hemoglobin < o2.Hemoglobin ? -1 : 0);
}
public static IComparer<Student> SortByName => new SortByNameComparer();
public static IComparer<Student> SortByDays => new SortByDaysComparer();
public static IComparer<Student> SortByHemoglobin => new SortByHemoglobinComparer();
}
public class Student
{
public string Name { get; set; } = "";
public int Days { get; set; } = 0;
public int Hemoglobin { get; set; } = 0;
public Student() { }
public Student(string name, int days, int hemoglobin)
{
this.Name = name;
this.Days = days;
this.Hemoglobin = hemoglobin;
}
public Student(Student s) : this(s.Name, s.Days, s.Hemoglobin) { }
public override string ToString() => $"{this.Name} {this.Days} {this.Hemoglobin}";
}
理想情况下，我将从Student继承List<Student>来获取内置列表操作。或者，我将在List<Student>中使用Student[]而不是Students。但这应该是一个好的开始。