C＃错误：“非静态字段，方法或属性需要对象引用” [英] C# error: "An object reference is required for the non-static field, method, or property"

问题描述

我有两个类，一个用于定义算法参数，另一个用于实现算法：

I have two classes, one for defining the algorithm parameters and another to implement the algorithm:

第1类（算法参数）：

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

namespace VM_Placement
{
    public static class AlgorithmParameters
    {
        public static int pop_size = 100;
        public static double crossover_rate = 0.7;
        public static double mutation_rate = 0.001;

        public static int chromo_length = 300;
        public static int gene_length = 4;
        public static int max_allowable_generations = 400;

        static Random rand = new Random();
        public static double random_num = rand.NextDouble();
    }
}

第2类（实现算法）：

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

namespace VM_Placement
{
    public class Program
    {
        public struct chromo_typ
        {
            public string   bits;
            public float    fitness;

            //public chromo_typ(){
            // bits = "";
            // fitness = 0.0f;
            //}
            chromo_typ(string bts, float ftns)
            {
                bits = bts;
                fitness = ftns;
            }
        };

        public static int GetRandomSeed()
        {
            byte[] bytes = new byte[4];
            System.Security.Cryptography.RNGCryptoServiceProvider rng =
              new System.Security.Cryptography.RNGCryptoServiceProvider();
            rng.GetBytes(bytes);
            return BitConverter.ToInt32(bytes, 0);
        }

        public string GetRandomBits()
        {
            string bits="";

            for (int i = 0; i < VM_Placement.AlgorithmParameters.chromo_length; i++)
            {
                if (VM_Placement.AlgorithmParameters.random_num > 0.5f)
                    bits += "1";
                else
                    bits += "0";
            }
            return bits;
        }

        public static void Main(string[] args)
        {
            Random rnd = new Random(GetRandomSeed());

            while (true)
            {
                chromo_typ[] Population = new chromo_typ[VM_Placement.AlgorithmParameters.pop_size];
                double Target;

                Console.WriteLine("\n Input a target number");
                Target = Convert.ToDouble(Console.ReadLine());

                for (int i = 0; i < VM_Placement.AlgorithmParameters.pop_size; i++)
                {
                    Population[i].bits = GetRandomBits();
                    Population[i].fitness = 0.0f;
                }
            }
        }
    }
}

我在 Population [i]上遇到错误。bits= GetRandomBits（）; 在 Main（）。

错误是：

非-static字段，方法或属性'VM_Placement.Program.GetRandomBits（）'

An object reference is required for the non-static field, method, or property 'VM_Placement.Program.GetRandomBits()'

我错过了什么吗？

推荐答案

Main 方法是静态的。您不能从静态方法调用非静态方法。

The Main method is Static. You can not invoke a non-static method from a static method.

GetRandomBits()

不是静态方法。您必须创建 Program

is not a static method. Either you have to create an instance of Program

Program p = new Program();
p.GetRandomBits();

或make

GetRandomBits（）静态。

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