C# 中建構函式和解構函式之間有什麼異同?
建構函式
類建構函式是類的特殊成員函式,當我們建立該類的物件時就會執行該函式。
建構函式與類具有完全相同的名稱,且沒有返回值型別。
建構函式與類同名 −
class Demo {
public Demo() {}
}示例如下 −
示例
using System;
namespace LineApplication {
class Line {
private double length; // Length of a line
public Line() {
Console.WriteLine("Object is being created");
}
public void setLength( double len ) {
length = len;
}
public double getLength() {
return length;
}
static void Main(string[] args) {
Line line = new Line();
// set line length
line.setLength(6.0);
Console.WriteLine("Length of line : {0}", line.getLength());
Console.ReadKey();
}
}
}輸出
Object is being created Length of line : 6
解構函式
解構函式是類的特殊成員函式,當該類的物件超出範圍時就會執行該函式。它既不能返回值,也不能接受任何引數。
它與類同名,但在前面加上波浪號 (~),例如,我們的類名為 Demo −
public Demo() { // constructor
Console.WriteLine("Object is being created");
}
~Demo() { //destructor
Console.WriteLine("Object is being deleted");
}我們來看一個示例,瞭解如何在 C# 中使用解構函式 −
示例
using System;
namespace LineApplication {
class Line {
private double length; // Length of a line
public Line() { // constructor
Console.WriteLine("Object is being created");
}
~Line() { //destructor
Console.WriteLine("Object is being deleted");
}
public void setLength( double len ) {
length = len;
}
public double getLength() {
return length;
}
static void Main(string[] args) {
Line line = new Line();
// set line length
line.setLength(6.0);
Console.WriteLine("Length of line : {0}", line.getLength());
}
}
}輸出
Object is being created Length of line : 6 Object is being deleted
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