C#汎用集合-List<br>テクニックの使用
List<T>
, , 。
List<T> ArrayList ,List<T> , , 。 List<T> :
List<T> =new List<T>();
, “<T>” , T , , 。 T 。 List<T> ,“<T>” T 。
: , , “()”。
List<T>, :
List<Student> students=new List<Student>();
List<T> 、 、 ArrayList , ArrayList 。
using System;
using System.Collections.Generic;
using System.Collections;
public class Student
{
public string Name
{
get;
set;
}
public string Number
{
get;
set;
}
public int Score
{
get;
set;
}
}
class Program
{
static void Main()
{
List < Student > students = new List < Student > ();
Student stu1 = new Student();
stu1.Name = " ";
stu1.Number = "0801";
stu1.Score = 20;
Student stu2 = new Student();
stu2.Name = " ";
stu2.Number = "0802";
stu2.Score = 23;
students.Add(stu1);
students.Add(stu2);
Console.WriteLine(" {0}", students.Count);
foreach (Student stu in students)
{
Console.WriteLine("\t{0}\t{1}\t{2}", stu.Name, stu.Number, stu.Score);
}
students.Remove(stu1);
Console.WriteLine(" {0}", students.Count);
Console.ReadLine();
}
}
Student List<T> , T Student , Student , , , , 。
List<T> ArrayList
List<T> ArrayList : 、 、 。
List<T> ArrayList :
ArrayList ;List<T> ;
ArratList , ;List<T> , ;
:
using System;
using System.Collections;
using System.Collections.Generic;
class Person
{
private string _name; //
private int _age; //
// Person
public Person(string Name, int Age)
{
this._name = Name;
this._age = Age;
}
//
public string Name
{
get
{
return _name;
}
}
//
public int Age
{
get
{
return _age;
}
}
}
class Program
{
static void Main()
{
// Person
Person p1 = new Person(" ", 30);
Person p2 = new Person(" ", 20);
Person p3 = new Person(" ", 50);
// Person
List < Person > persons = new List < Person > ();
// Person
persons.Add(p1);
persons.Add(p2);
persons.Add(p3);
// 2
Console.WriteLine(persons[1].Name);
foreach (Person p in persons)
{
Console.WriteLine("\t{0}\t{1}", p.Name, p.Age);
}
}
}
, , , 。 , , 。
COMBOX
public class vendor
{
private string _UserCode;
private string _VendorDes;
public string VendorDes
{
get { return _VendorDes; }
set { _VendorDes = value; }
}
public string UserCode
{
get { return _UserCode; }
set { _UserCode = value; }
}
public vendor(string display, string value)
{
_VendorDes = display;
_UserCode = value;
}
public vendor() { }
}
/// <summary>
///
/// </summary>
/// <param name="sql"></param>
/// <returns></returns>
public List<Model.vendor>GetVendList()
{
List<Model.vendor> lstV = new List<Model.vendor>();
string sql = string.Format("select code,vendordes from vendor");
using (SqlDataReader dr = SqlHelper.ExecuteReader(SqlHelper.conn, CommandType.Text, sql))
{
while (dr.Read())
{
lstV.Add(new Model.vendor(dr["code"].ToString().Trim (), dr["vendordes"].ToString().Trim ()));
}
}
return lstV;
}
// COMBOX
BLL.PO vd = new BLL.PO();
List<Model.vendor> lst =new List<Model.vendor>();
lst =vd.GetVendList();
foreach (Model.vendor v in lst)
{
string code = v.UserCode;
string vendor = v.VendorDes;
comboBox1.Items.Add(vendor);
comboBox1.DisplayMember = code;
comboBox1.ValueMember = vendor;
}
テキストリンク:http://www.code-design.cn/article/20120210/csharp-generic-list-object.aspx