要将引用分配给变量,请使用ref关键字。引用参数是对变量的存储位置的参考。当您通过引用传递参数时,与值参数不同,不会为这些参数创建新的存储位置。使用ref关键字声明引用参数。
让我们看一个例子-
在这里,我们使用ref关键字交换两个值-
using System;
namespace Demo {
class Program {
public void swap(ref int x, ref int y) {
int temp;
temp = x; /* save the value of x */
x = y; /* put y into x */
y = temp; /* put temp into y */
}
static void Main(string[] args) {
Program p = new Program();
/* local variable definition */
int a = 99;
int b = 110;
Console.WriteLine("Before swap, value of a : {0}", a);
Console.WriteLine("Before swap, value of b : {0}", b);
/* calling a function to swap the values */
p.swap(ref a, ref b);
Console.WriteLine("After swap, value of a : {0}", a);
Console.WriteLine("After swap, value of b : {0}", b);
Console.ReadLine();
}
}
}输出结果
Before swap, value of a : 99 Before swap, value of b : 110 After swap, value of a : 110 After swap, value of b : 99