C# 从一个文本文件中读取并搜索，看它是否是一头奶牛，以及每月的最高成本，然后将其打印到屏幕上

嘿，我在做BIT（信息技术学士），我读了一个有20行的文本文件，它被“，“我想做的是获取该文本文件，我想在“切换”菜单中找到牛奶最多的奶牛我已经按ID号进行了搜索，但我就是无法从该文本文件中找到牛奶最多的奶牛

class Program
{
    static void Main(string[] args)
    {
        Livestock[] animals = new Livestock[20];
        int counter = 0;
        string myLine;
        string[] words;
        TextReader tr = new StreamReader("S:/BIT694/livestock.txt");

        while ((myLine = tr.ReadLine()) != null)
        {
            words = myLine.Split(',');
            int ID = int.Parse(words[0]);
            string LivestockType = words[1];
            int YearBorn = int.Parse(words[2]);
            double CostPerMonth = double.Parse(words[3]);
            double CostOfVaccination = double.Parse(words[4]);
            double AmountMilk = double.Parse(words[5]);

            if (LivestockType == "Cow")
            {
                Cow newCow = new Cow(ID, "Cow", YearBorn, CostPerMonth, CostOfVaccination, AmountMilk);
                animals[counter] = newCow;
            }
            else if (LivestockType == "Goat")
            {
                Goat newGoat = new Goat(ID, "Goat", YearBorn, CostPerMonth, CostOfVaccination, AmountMilk);
                animals[counter] = newGoat;
            }
            counter++;
        }
        int choice;

        for (;;)
        {
            do
            {
                Console.WriteLine("--------Menu--------"); // The menue Title
                Console.WriteLine();
                Console.WriteLine("1) Display livestock information by ID"); // Display the livestock by ID number
                Console.WriteLine("2) Display cow that produced the most milk"); // Displays the cow that porduces the most milk
                Console.WriteLine("3) Display goat that produced the least amount of milk"); // Displays the goat that produces the least amount of milk
                Console.WriteLine("4) Calculate farm profit"); // Calculates the farm profit
                Console.WriteLine("5) Display unprofitable livestock"); // Displays the unprofitable livestock
                Console.WriteLine("0) Exit"); // Exits the program
                Console.WriteLine();
                Console.Write("Enter an option: ");

                choice = int.Parse(Console.ReadLine());
            } while (choice < 0 || choice > 5);

             if (choice == 0) break;

             Console.WriteLine("\n");

             switch(choice)
             {
                case 1:
                    Console.Write("Enter livestock ID: ");
                    int input = int.Parse(Console.ReadLine());

                    // Find animal by id
                    Livestock livestock = null;
                    for(int i = 0; i < 20; i++)
                    {
                        if(animals[i].iD == input)
                        {
                            livestock = animals[i];     // Get the animal
                        }
                    }

                    if(livestock != null)
                    {
                        livestock.displayInfo();
                    } else
                    {
                        Console.WriteLine("ID not found"); // Invaild ID
                    }

                    break;
                case 2:
                    Console.WriteLine("Cow that produced the most Milk:");

                    break;
                case 3:
                    Console.WriteLine("Goat that produced the least amount of milk:");
                    break;
                case 4:
                    Console.WriteLine("Calculateion of farm profit:");
                    break;
                case 5:
                    Console.WriteLine("Livestock that are not profitable:");
                    break;
                case 0:
                    Environment.Exit(0);
                    break;
                default:
                    Console.WriteLine("The Option that you have entered is invalid please try again");

                    break;
            }
            Console.ReadLine();
        }
    }
}

public class Livestock
{
    private int ID; //ID Number of livestock
    private string LivestockType; //Value is either "Cow" or "Goat"
    private int YearBorn; //Year of birth with format YYYY (i.e. 2014)
    private double CostPerMonth; //The cost per month
    private double CostOfVaccination; //Annual vaccination cost
    private double AmountMilk; //The amount of milk produced per day in liters

    public int iD { get { return ID; } }
    public string livestockType { get { return LivestockType; } }
    public double costPerMonth { get { return CostPerMonth; } }

    public Livestock(int ID, string LivestockType,int YearBorn,double CostPerMonth,double CostOfVaccination,double AmountMilk)
    {
        this.ID = ID;
        this.LivestockType = LivestockType;
        this.YearBorn = YearBorn;
        this.CostPerMonth = CostPerMonth;
        this.CostOfVaccination = CostOfVaccination;
        this.AmountMilk = AmountMilk;

    }

    public void displayInfo()
    {
        Console.WriteLine();
        Console.WriteLine(LivestockType);
        Console.WriteLine("ID:\t\t\t {0}",iD);
        Console.WriteLine("Year Born:\t\t {0}",YearBorn);
        Console.WriteLine("Cost Per Month\t\t ${0}",CostPerMonth);
        Console.WriteLine("Cost Of Vaccination:\t ${0}",CostOfVaccination);
        Console.WriteLine("Milk Per Day:\t\t {0}liters",AmountMilk);
        return;

    }


}

class Cow : Livestock
{
    public Cow(int ID, string LivestockType, int YearBorn, double CostPerMonth, double CostOfVaccination, double AmountMilk) : base(ID, LivestockType, YearBorn, CostPerMonth, CostOfVaccination, AmountMilk)
    {     

    }
}

类程序
{
静态void Main（字符串[]参数）
{
牲畜[]动物=新牲畜[20]；
int计数器=0；
线状糜棱线；
字符串[]个单词；
TextReader tr=新的StreamReader（“S:/BIT694/alvest.txt”）；
而（（myLine=tr.ReadLine（））！=null）
{
words=myLine.Split（'，'）；
int ID=int.Parse（字[0]）；
字符串LivestockType=words[1]；
int YearBorn=int.Parse（单词[2]）；
double CostPerMonth=double.Parse（单词[3]）；
double costof=double.Parse（单词[4]）；
double AmountMilk=double.Parse（单词[5]）；
如果（LivestockType==“Cow”）
{
Cow newCow=新奶牛（ID，“Cow”，一岁出生，每月成本，接种成本，牛奶数量）；
动物[柜台]=新牛；
}
else if（LivestockType==“Goat”）
{
山羊-新山羊=新山羊（ID，“山羊”，一岁出生，每月成本，接种成本，牛奶数量）；
动物[柜台]=新山羊；
}
计数器++；
}
智力选择；
对于（；；）
{
做
{
Console.WriteLine（“--Menu------”；//菜单标题
Console.WriteLine（）；
Console.WriteLine（“1）按ID显示牲畜信息”）；//按ID号显示牲畜
Console.WriteLine（“2）显示产奶最多的奶牛”）；//显示产奶最多的奶牛
Console.WriteLine（“3）显示产奶量最少的山羊”）；//显示产奶量最少的山羊
Console.WriteLine（“4）计算农场利润”）；//计算农场利润
Console.WriteLine（“5）显示无利可图的牲畜”）；//显示无利可图的牲畜
Console.WriteLine（“0）Exit”）；//退出程序
Console.WriteLine（）；
编写（“输入选项：”）；
choice=int.Parse（Console.ReadLine（））；
}而（选择<0 | |选择>5）；
如果（选项==0）中断；
Console.WriteLine（“\n”）；
开关（选择）
{
案例1：
控制台。写入（“输入牲畜ID:”；
int input=int.Parse（Console.ReadLine（））；
//通过id查找动物
家畜=空；
对于（int i=0；i<20；i++）
{
if（动物[i].iD==输入）
{
家畜=动物[我]；//得到动物
}
}
if（牲畜！=null）
{
displayInfo（）；
}否则
{
Console.WriteLine（“找不到ID”）；//Invaild ID
}
打破
案例2：
Console.WriteLine（“产奶最多的奶牛：”）；
打破
案例3：
控制台.WriteLine（“产奶量最少的山羊：”）；
打破
案例4：
Console.WriteLine（“农场利润计算：”）；
打破
案例5：
Console.WriteLine（“不盈利的牲畜：”）；
打破
案例0：
环境。退出（0）；
打破
违约：
Console.WriteLine（“您输入的选项无效，请重试”）；
打破
}
Console.ReadLine（）；
}
}
}
公营牲畜
{
private int ID；//牲畜的ID号
私有字符串LivestockType；//值为“Cow”或“Goat”
private int YearBorn；//格式为YYYY的出生年份（即2014年）
private double CostPerMonth；//每月的成本
私人双重接种成本；//年度接种成本
私人双倍牛奶；//每天生产的牛奶量（升）
公共int iD{get{return iD；}}
公共字符串livestockType{get{return livestockType；}}
公共双costPerMonth{get{return costPerMonth；}}
公共牲畜（整数ID，字符串牲畜类型，整数年出生，双倍成本每月，双倍接种成本，双倍牛奶）
{
this.ID=ID；
this.LivestockType=LivestockType；
this.YearBorn=YearBorn；
this.CostPerMonth=CostPerMonth；
this.costof疫苗接种=疫苗接种成本；
this.AmountMilk=AmountMilk；
}
public void displayInfo（）
{
Console.WriteLine（）；
Console.WriteLine（LivestockType）；
WriteLine（“ID:\t\t\t{0}”，ID）；
WriteLine（“出生年份：\t\t{0}”，出生年份）；
WriteLine（“每月成本\t\t${0}”，每月成本）；
WriteLine（“疫苗接种成本：\t${0}”，疫苗接种成本）；
WriteLine（“每天牛奶：\t\t{0}升”，AmountMilk）；
返回；
}
}
牛类：家畜
{
公共奶牛（国际标识，字符串牲畜类型，国际年出生，双成本每月，双成本接种，双倍牛奶）：基础（国际标识，牲畜类型，年出生，成本每月，Co
 case 2:
    Cow cowWithBestMilk; //Used to save the cow with the most milk production

    ///Lets Search
    for( int i = 0; i < animals.Count; ++i)
    {
      //check lifestock, but only cows
      if( LivestockType == "Cow" )
      {
        //Amount to check of my livestock
        double livestockMilk = animals[i].getMilkAmount(); //<-- fantasy code, you have to acces here the AmountMilk of your cow
       if(cowWithBestMilk != null)
       {
          //check if the cow from the lifestock got more milk than the other cow
          if( livestockMilk > cowWithBestMilk.getMilkAmount() ) //<-- you can use >= instead of > if you want to have the last cow with the same amount
          {
             cowWithBestMilk = animals[i]; 
          }
       }
       else
       {
         //there was no other cow until now
         cowWithBestMilk = animals[i];
       }

      } //if type cow

    } //for

    if( cowWithBestMilk != null)
    {
      Console.WriteLine("Cow that produced the most Milk:" + cowWithBestMilk.getHerIdAsString() ); //<--fantasy code here
    }
    else
    {
      Console.WriteLine("Who let the cows out?");
    }

    break;

public string SomeProperty { get; set; }

Livestock maxCow = animals.Where(animal => animal.LivestockType == "Cow").OrderByDescending(animal => animal.AmountMilk).FirstOrDefault();

animals.Where(animal => animal.LivestockType == "Cow"

        static void Main(string[] args)
        {
            Livestock[] animals = new Livestock[20];
            int counter = 0;
            string myLine;
            string[] words;
            TextReader tr = new StreamReader("S:/BIT694/livestock.txt");

            while ((myLine = tr.ReadLine()) != null)
            {
                words = myLine.Split(',');
                int ID = int.Parse(words[0]);
                string LivestockType = words[1];
                int YearBorn = int.Parse(words[2]);
                double CostPerMonth = double.Parse(words[3]);
                double CostOfVaccination = double.Parse(words[4]);
                double AmountMilk = double.Parse(words[5]);

                if (LivestockType == "Cow")
                {
                    Cow newCow = new Cow(ID, "Cow", YearBorn, CostPerMonth, CostOfVaccination, AmountMilk);
                    animals[counter] = newCow;
                }
                else if (LivestockType == "Goat")
                {
                    Goat newGoat = new Goat(ID, "Goat", YearBorn, CostPerMonth, CostOfVaccination, AmountMilk);
                    animals[counter] = newGoat;
                }
                counter++;
            }
            int choice;

            for (;;)
            {
                do
                {
                    Console.WriteLine("--------Menu--------"); // The menue Title
                    Console.WriteLine();
                    Console.WriteLine("1) Display livestock information by ID"); // Display the livestock by ID number
                    Console.WriteLine("2) Display cow that produced the most milk"); // Displays the cow that porduces the most milk
                    Console.WriteLine("3) Display goat that produced the least amount of milk"); // Displays the goat that produces the least amount of milk
                    Console.WriteLine("4) Calculate farm profit"); // Calculates the farm profit
                    Console.WriteLine("5) Display unprofitable livestock"); // Displays the unprofitable livestock
                    Console.WriteLine("0) Exit"); // Exits the program
                    Console.WriteLine();
                    Console.Write("Enter an option: ");

                    choice = int.Parse(Console.ReadLine());
                } while (choice < 0 || choice > 5);

                if (choice == 0) break;

                Console.WriteLine("\n");

                switch (choice)
                {
                    case 1:
                        Console.Write("Enter livestock ID: ");
                        int input = int.Parse(Console.ReadLine());
                        Livestock livestock = animals.Where(animal => animal.ID == input).ToList().FirstOrDefault();
                        if (livestock != null)
                        {
                            livestock.displayInfo();
                        }
                        else
                        {
                            Console.WriteLine("ID not found"); // Invaild ID
                        }

                        break;
                    case 2:
                        Console.WriteLine("Cow that produced the most Milk:");
                        Livestock maxCow = animals.Where(animal => animal.LivestockType == "Cow").OrderByDescending(animal => animal.AmountMilk).FirstOrDefault();
                        if (maxCow != null)
                            maxCow.displayInfo();
                        else
                            Console.WriteLine("No cow");
                        break;
                    case 3:
                        Console.WriteLine("Goat that produced the least amount of milk:");
                        break;
                    case 4:
                        Console.WriteLine("Calculateion of farm profit:");
                        break;
                    case 5:
                        Console.WriteLine("Livestock that are not profitable:");
                        break;
                    case 0:
                        Environment.Exit(0);
                        break;
                    default:
                        Console.WriteLine("The Option that you have entered is invalid please try again");

                        break;
                }
                Console.ReadLine();
            }
        }
    }

    public class Livestock
    {
        public int ID { get; set; } //ID Number of livestock
        public string LivestockType {get; set;} //Value is either "Cow" or "Goat"
        public int YearBorn  { get; set; } //Year of birth with format YYYY (i.e. 2014)
        public double CostPerMonth  { get; set; }//The cost per month
        public double CostOfVaccination { get; set; } //Annual vaccination cost
        public double AmountMilk { get; set; } //The amount of milk produced per day in liters

        public Livestock(int ID, string LivestockType, int YearBorn, double CostPerMonth, double CostOfVaccination, double AmountMilk)
        {
            this.ID = ID;
            this.LivestockType = LivestockType;
            this.YearBorn = YearBorn;
            this.CostPerMonth = CostPerMonth;
            this.CostOfVaccination = CostOfVaccination;
            this.AmountMilk = AmountMilk;

        }

        public void displayInfo()
        {
            Console.WriteLine();
            Console.WriteLine(LivestockType);
            Console.WriteLine("ID:\t\t\t {0}", iD);
            Console.WriteLine("Year Born:\t\t {0}", YearBorn);
            Console.WriteLine("Cost Per Month\t\t ${0}", CostPerMonth);
            Console.WriteLine("Cost Of Vaccination:\t ${0}", CostOfVaccination);
            Console.WriteLine("Milk Per Day:\t\t {0}liters", AmountMilk);
            return;
        }
    }