C# 方法的传参

emplace_back2024-03-21 20:16

引用传参

csharp 复制代码

using System;


public class Program
{
	public static void Main()
	{
		Tools t = new Tools();
		t.bf();
		double a = 10;
		double b = 20;
		t.change(ref a, ref b);
		Console.WriteLine(b);
	}
}

class Tools {
	public void af() {Console.Write("a\n");}
	internal void bf() {Console.Write("b\n");}
	public void change(ref double a, ref double b) {
		dynamic t;
		t = a;
		a = b;
		b = t;
	}
	
}

调用方法时，你必须使用 ref 关键字：

csharp 复制代码

t.change(ref a, ref b);

输出传参

csharp 复制代码

using System;

namespace LHJ {

    class TODO {
        static void Main() {
            Tools t = new Tools();

            int a, b;
            Console.WriteLine("add = {0}, doublea = {1}, double b = {2}",
                t.foo(2, 3, out a, out b), a, b);

        }
    }

    class Tools {
        public int foo(int x, int y, out int a, out int b) {
            a = x * 2;
            b = y * 2;
            return x + y;
        }
    }

}

csharp 复制代码

public int foo(int x, int y, out int a, out int b)

此方法返回一个int的foo，和两个out int

注意调用时要带out

csharp 复制代码

t.foo(2, 3, out a, out b)