c# class constructor

class constructor c# 入門

>class constructor コンストラクタ

コンストラクタとはインスタンスが作成時に実行される処理です。

C#
構文
アクセス修飾子クラス名と同じ名前()
{
処理
}

サンプル
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication7
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
person taro = new person();
taro.print();

}
class person
{
int age;
string name;

public person()
{
age = 20;

}

public void print()
{
Console.Write(age);
}
}

}
}

vb
構文
アクセス修飾子 Sub New ()
処理
End Sub

サンプル
Public Class Form1
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim taro As New person
taro.print
End Sub

Class person
Dim age As Integer
Dim name As String

Public Sub New()
age = 20
End Sub

Sub print()
Console.Write(age)

End Sub

End Class
End Class

引数のあるコンストラクタ

C#
構文
public person(型変数名,型変数名)
{
処理
}

C#
サンプル
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication7
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
person taro = new person(20, “taro”);
taro.print();

}
class person
{
int age;
string name;

public person(int _age,string _name)
{
age = _age;
name = _name;
}

public void print()
{
Console.Write(age + name);
}
}

}
}

実行結果は
20taro

vb
構文
public クラス名(型変数名,型変数名)
{
処理
}

サンプル
Public Class Form1
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim taro As New person(20, “taro”)
taro.print
End Sub

Class person
Dim age As Integer
Dim name As String

Public Sub New(ByVal _age As Integer,ByVal _name As String)
age = _age
name = _name
End Sub

Sub print()
Console.Write(age & name)