C＃编写代码实现接收一个班级五名学员的姓名和三门课程的考试成绩，计算每 名学员三门课程的总成绩、平均成绩。并输出学员姓名、三门课的成绩、总成绩和平 均成绩，以及班级参加考试人数，三门课总和的最高分和平均分

下面是一份C#代码实现：

using System;

namespace ScoreCalculator
{
    class Program
    {
        static void Main(string[] args)
        {
            const int NUM_OF_STUDENTS = 5;
            const int NUM_OF_COURSES = 3;
            
            string[] names = new string[NUM_OF_STUDENTS];
            double[,] scores = new double[NUM_OF_STUDENTS, NUM_OF_COURSES];
            double[] totals = new double[NUM_OF_STUDENTS];
            double[] averages = new double[NUM_OF_STUDENTS];
            double[] courseTotals = new double[NUM_OF_COURSES];
            int numOfParticipates = 0;
            double highestScore = 0;
            double courseTotalSum = 0;

            // Input student names and scores
            for (int i = 0; i < NUM_OF_STUDENTS; i++)
            {
                Console.WriteLine($"Enter the name of student {i + 1}:");
                names[i] = Console.ReadLine();

                Console.WriteLine($"Enter the scores of student {i + 1}:");
                for (int j = 0; j < NUM_OF_COURSES; j++)
                {
                    Console.Write($"Course {j + 1}: ");
                    scores[i, j] = double.Parse(Console.ReadLine());
                }
                Console.WriteLine();
            }

            // Calculate totals and averages
            for (int i = 0; i < NUM_OF_STUDENTS; i++)
            {
                double total = 0;
                for (int j = 0; j < NUM_OF_COURSES; j++)
                {
                    total += scores[i, j];
                    courseTotals[j] += scores[i, j];
                    courseTotalSum += scores[i, j];
                }
                totals[i] = total;
                averages[i] = total / NUM_OF_COURSES;
                if (totals[i] > highestScore)
                {
                    highestScore = totals[i];
                }
                if (totals[i] > 0)
                {
                    numOfParticipates++;
                }
            }

            // Output results
            Console.WriteLine("Name\tCourse 1\tCourse 2\tCourse 3\tTotal\tAverage");
            for (int i = 0; i < NUM_OF_STUDENTS; i++)
            {
                Console.Write($"{names[i]}\t");
                for (int j = 0; j < NUM_OF_COURSES; j++)
                {
                    Console.Write($"{scores[i, j]}\t\t");
                }
                Console.Write($"{totals[i]}\t{averages[i]}\n");
            }
            Console.WriteLine($"Number of participates: {numOfParticipates}");
            Console.WriteLine($"Highest score: {highestScore}");
            Console.WriteLine($"Average score: {courseTotalSum / (NUM_OF_STUDENTS * NUM_OF_COURSES)}");
        }
    }
}

这份代码使用了一个二维数组 `scores` 来存储每个学生的成绩，一个一维数组 `totals` 来存储每个学生的总成绩，一个一维数组 `averages` 来存储每个学生的平均成绩，以及一个一维数组 `courseTotals` 来存储每门课程的总分数。在输入学生姓名和成绩后，代码遍历每个学生的成绩并计算总成绩、平均成绩以及每门课程的总分数。最后输出每个学生的姓名、成绩、总成绩和平均成绩，以及班级参加考试人数、三门课的总和的最高分和平均分。