代码：
1.city部分
namespace city
{
public class City:IComparable<City>
{
public string name;
public int Xpos;
public int Ypos;
public City(string _name, int X, int Y)
{
name = _name;
Xpos = X;
Ypos = Y;
}
public int CompareTo(City other)
{
if (other.name == name || other.Xpos == Xpos && other.Ypos == Ypos)
return 0;
else
return -1;
}
public override string ToString()
{
return string.Format("{0},( {1},{2} )",name,Xpos,Ypos);
}
}
}
2.泛型接口部分、
namespace city
{
public interface ILinearList<T>where T:IComparable<T>//定义泛型接口
{
int Length { get; }
T this[int index] { get;set; }
bool IsEmpty();
void Remove(int index);
int Search(T data);
void Clear();
void Insert(int index,T data);
void Update(int index, T data);
}
}
3.单链表结点部分·
namespace city
{
public class SNode<T> where T : IComparable<T>//定义结点的形式。数据+下一个节点的位置
{
public T Data{get;set;}
public SNode<T> Next { get; set; }
public SNode(T data, SNode<T> next)
{
Data = data;
Next = next;
}
}
}
4.由子类实现泛型接口部分
namespace city
{
public class SLinkList<T> : ILinearList<T> where T : IComparable<T>
{
public SNode<T> arrow;
public int _length;
public int Length
{
get { return _length; }
}
public SLinkList()
{
_length = 0;
arrow = null;
}
private SNode<T> Locate(int index)//获取指定位置i上结点的内容（地址）
{
if (index < 0 || index > Length - 1)
throw new IndexOutOfRangeException();
SNode<T> temp = arrow;
for (int i = 0; i < index; i++)
{
temp = temp.Next;
}
return temp;
}
public T this[int index]
{
get
{
return Locate(index).Data;//进一步获取节点的数据部分。
}
set
{
if (index < 0 || index > Length - 1)
throw new IndexOutOfRangeException();
Locate(index).Data = value;
}
}
public void Clear()
{
arrow = null;
_length = 0;
}
public bool IsEmpty()
{
return (_length == 0);
}
public void Remove(int index)
{
if (index < 0 || index > Length - 1)
throw new IndexOutOfRangeException();
if (index == 0)
arrow = arrow.Next;
else
{
SNode<T> tempp=Locate(index-1);
tempp.Next = tempp.Next.Next;
}
_length--;
}
public int Search(T data)
{
int i;
SNode<T> temp = arrow;
for (i = 0; i < Length - 1; i++)
{
if (temp.Data.CompareTo(data) == 0)
break;
temp = temp.Next;
}
return i == Length ? -1 : i;
}
public void InsertFirst(T data)
{
arrow = new SNode<T>(data, arrow);
_length++;
}
public void InsertRear(T data)
{
if (arrow == null)
arrow = new SNode<T>(data, null);
else
{
Locate(Length - 1).Next = new SNode<T>(data, null);
}
_length++;
}
public void Insert(int index, T data)
{
//if (index < 0 || index > Length - 1)
//throw new IndexOutOfRangeException();
if (index == 0)
{
InsertFirst(data);
}
else if (index == Length - 1)
{
InsertRear(data);
}
else
{
SNode<T> temp = Locate(index-1);
temp.Next = new SNode<T>(data, temp.Next);
_length++;
}
}
public void Update(int index, T data)
{
Locate(index).Data = data;
}
}
}
5.小窗体的实现
namespace city
{
public partial class Form1 : Form
{
private readonly ILinearList<City> al = new SLinkList<City>();//不加private readonly为什莫是只读？
public Form1()
{
InitializeComponent();
initstate();//不加返回值类型
}
private void groupBox1_Enter(object sender, EventArgs e)
{
}
private void yylabel3_Click(object sender, EventArgs e)
{
}
private void label2_Click(object sender, EventArgs e)
{
}
public void initstate()
{
al.Insert(0, new City("城市A", 500, 500));
al.Insert(1, new City("城市B", 700, 300));
al.Insert(2, new City("城市C", 600, 1200));
al.Insert(3, new City("城市D", 100, 20));
al.Insert(4, new City("城市E", 120, 400));
al.Insert(5, new City("城市F", 1200, 190));
al.Insert(6, new City("城市G", 900, 809));
al.Insert(7, new City("城市H", 20, 934));
for (int i = 0; i < al.Length; i++)
{
CitylistBox1.Items.Add(al[i]);//索引器的用法
}
}
private void InsertAtFirst_Click(object sender, EventArgs e)
{
if (CityNametB1.Text == null || XXtB1.Text == null || yytB1.Text == null)
MessageBox.Show("参数不足", "系统提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
else
{
al.Insert(0, new City(CityNametB1.Text, int.Parse(XXtB1.Text), int.Parse(yytB1.Text)));
CitylistBox1.Items.Clear();
Updateall();
}
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void Updateall()
{
for (int i = 0; i < al.Length; i++)
{
CitylistBox1.Items.Add(al[i]);//索引器的用法
}
}
private void InsertAtRear_Click(object sender, EventArgs e)
{
if (CityNametB1.Text == null || XXtB1.Text == null || yytB1.Text == null)
MessageBox.Show("参数不足", "系统提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
else
{
al.Insert(al.Length - 1, new City(CityNametB1.Text, int.Parse(XXtB1.Text), int.Parse(yytB1.Text)));
CitylistBox1.Items.Clear();
Updateall();
}
}
private void Insert_Click(object sender, EventArgs e)
{
if (CityNametB1.Text == null || XXtB1.Text == null || yytB1.Text == null)
MessageBox.Show("参数不足", "系统提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
else
{
al.Insert(InsertnUD.DecimalPlaces, new City(CityNametB1.Text, int.Parse(XXtB1.Text), int.Parse(yytB1.Text)));
CitylistBox1.Items.Clear();
Updateall();
}
}
private void groupBox2_Enter(object sender, EventArgs e)
{
}
private void Delete_Click(object sender, EventArgs e)
{
al.Remove(RemovenUD.DecimalPlaces);
CitylistBox1.Items.Clear();
Updateall();
}
private void Update_Click(object sender, EventArgs e)
{
al.Update(UpdatenUD.DecimalPlaces, new City(CityNametB1.Text, int.Parse(XXtB1.Text), int.Parse(yytB1.Text)));
CitylistBox1.Items.Clear();
Updateall();
}
private void CitylistBox1_SelectedIndexChanged(object sender, EventArgs e)
{
}
private void Spbtn_Click(object sender, EventArgs e)
{
int s;
s=al.Search(new City(CityNametB2.Text, 0, 0));
Xlabel.Text = al[s].Xpos.ToString();//int转换成string类型。
Ylabel.Text = al[s].Ypos.ToString();
}
private void label4_Click(object sender, EventArgs e)
{
}
private void Snbtn_Click(object sender, EventArgs e)
{
listBox1.Items.Clear();
int x0 = int.Parse(xxtB3.Text);
int y0 = int.Parse(yytB3.Text);
double d = double.Parse(DistancetB.Text);
for (int i = 0; i < al.Length; i++)
{
if ((al[i].Xpos - x0) * (al[i].Xpos - x0) + (al[i].Ypos - y0) * (al[i].Ypos - y0) <= d*d)
listBox1.Items.Add(al[i]);
}
}
}
}
6.运行图
