c# - 在同一个类中调用方法

Question

我正在开发一个简单的程序来生成一组值并对它们执行一些基本计算。我在从 Main 方法调用“Mean”和“Median”方法时遇到问题。我在下面附上了编译器错误。谢谢。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication4
{
    class arraymod
    {
        static void Main(string[] args)
        {
            int[] values;
            values = new int[10];
            Random rand = new Random();
            for (int i = 0; i < 10; i++)
            {
                values[i] = rand.Next(1,20);
            }

            Array.Sort(values);
            for (int i = 0; i < 10; i++)
            {
                Console.WriteLine(values[i]);
            }
            Console.WriteLine("Min: {0}", values.Min());
            Console.WriteLine("Max: {0}", values.Max());
            Console.WriteLine("Sum: {0}", values.Sum());
            Console.WriteLine("Mean: {0}", values.Mean()); //program fails here
            Console.WriteLine("Median: {0}", values.Median());
        }
        public int Mean(int[] arr)
        {
            int valuesMean = arr.Sum()/arr.Count();
            return valuesMean;
        }
        public int Median(int[] arr)
        {
            int valuesMedian = (arr.Max()+ arr.Min())/2;
            return valuesMedian;
        }
    }
}

arraymod.cs(29,42):

error CS1061: 'System.Array' does not contain a definition for 'Mean' and no extension method 'Mean' accepting a first argument of
type 'System.Array' could be found (are you missing a using directive or an assembly reference?)

Answer 1

1) 您需要调用 Mean(values) 和 Median(values)

2) Main 是静态方法，而 Mean 和 Median 是实例方法。创建一个 arraymod 的实例并调用它们:

var inst = new arraymod();
int mean = inst.Mean(values);
int median = inst.Median(values);

或者，将方法设为静态:

public static int Mean(int[] arr)
public static int Median(int[] arr)