2048

• 用参数改变二维数组(引用数据类型)里的项直接改变原数组
• 如果是基本数据类型改变参数不会改变原字段

改变原数组

public class Test
{
    static void Main1()
    {
        int[,] i = { { 1 } };
        int[,] q = TestNum(i);
        Console.WriteLine(i);
    }

    private static int[,] TestNum(int[,] num)
    {
        num[0, 0] += 1;
        return num;
    }
}

不改变原数组

public class Test
{
    static void Main()
    {
        int i = 1;
        int q = TestNum(i);
        Console.WriteLine(i);
    }

    private static int TestNum(int num)
    {
        num += 1;
        return num;
    }
}