C#中的預設建構函式是什麼?
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。預設建構函式沒有任何引數。
以下示例展示瞭如何在 C# 中使用預設建構函式 −
示例
using System; namespace LineApplication { class Line { private double length; // Length of a line public Line(double len) { //Parameterized constructor Console.WriteLine("Object is being created, length = {0}", len); length = len; } public void setLength( double len ) { length = len; } public double getLength() { return length; } static void Main(string[] args) { Line line = new Line(10.0); Console.WriteLine("Length of line : {0}", line.getLength()); // set line length line.setLength(6.0); Console.WriteLine("Length of line : {0}", line.getLength()); Console.ReadKey(); } } }
輸出
Object is being created, length = 10 Length of line : 10 Length of line : 6
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