Question

我有一个文本文件，其内容与下面类似，我想添加每一列我已经将它们分别放在一个数组中并拆分并命名只需要计算双打

示例文件内容：

1,cow,2007,134.50,74.90,14.4
2,goat,2012,112.32,66.50,3.2

代码：

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]);


eConsole.WriteLine("Calculation of farm profit: ");
                        Console.Write("Enter price of milk: $");
                        double PriceOfMilk = double.Parse(Console.ReadLine());
                        Livestock SumOfMilk = null;
                        PriceOfMilk = PriceOfMilk * SumOfMilk.amountMilk * 365;
                        double cost = SumOfMilk.costPerMonth + SumOfMilk.costOfVaccination;
                        double total = PriceOfMilk - cost;
                            Console.WriteLine("Farm profit: ${0}", total);
                            Console.ReadLine();
                            Console.WriteLine();
                            Console.WriteLine("Press any key to return to the main menu...");

Answer 1

执行此操作的一种方法是在Livestock循环中创建新的foreach对象，并将其添加到animals列表中。然后你就可以获得每个项目的Sum。

首先，这是System.Linq从您的文件中创建Livestock列表的方法：

List<Livestock> animals = File.ReadLines("S:/BIT694/livestock.txt")
    .Select(line => line.Split(','))
    .Select(words => new Livestock
    {
        ID = int.Parse(words[0]),
        LivestockType = words[1],
        YearBorn = int.Parse(words[2]),
        CostPerMonth = double.Parse(words[3]),
        CostOfVaccination = double.Parse(words[4]),
        AmountMilk = double.Parse(words[5])
    })
    .ToList();

然后你可以输出总数，如：

Console.WriteLine($"Total cost per month: {animals.Sum(a => a.CostPerMonth)}");
Console.WriteLine($"Total cost of vaccinations: {animals.Sum(a => a.CostOfVaccination)}");
Console.WriteLine($"Total amount of milk: {animals.Sum(a => a.AmountMilk)}");

如果第一个代码段中的Linq令人困惑，则与以下内容相同：

List<Livestock> animals = new List<Livestock>();

foreach (var line in File.ReadLines("S:/BIT694/livestock.txt"))
{
    var words = line.Split(',');

    var animal = new Livestock
    {
        ID = int.Parse(words[0]),
        LivestockType = words[1],
        YearBorn = int.Parse(words[2]),
        CostPerMonth = double.Parse(words[3]),
        CostOfVaccination = double.Parse(words[4]),
        AmountMilk = double.Parse(words[5])
    };

    animals.Add(animal);
}

Answer 2

我已经想出了如何做到这一点我希望这有助于其他人

Console.WriteLine("Calculation of farm profit: ");
                        Console.Write("Enter price of milk: $");
                        double PriceOfMilk = double.Parse(Console.ReadLine());
                        double sumOfMilk = 0.0;
                        // loop through all livestocks (the array)
                        for (int i = 0; i < 20; i++)
                        {
                            sumOfMilk += animals[i].amountMilk;
                        }// end of for loop sumOfMilk
                        double yearIncome = sumOfMilk * 365 * PriceOfMilk; // total income
                        double cost = 0.0;
                        for (int i = 0; i < 20; i++)
                        {
                            cost += animals[i].costOfVaccination; // vaccination
                            cost += animals[i].costPerMonth * 12;
                        }// end of for loop Vaccination
                        double total = yearIncome - cost;
                        // Farms total profit for the year
                        Console.WriteLine("Farm profit: ${0}", total.ToString("0.00"));
                        Console.WriteLine();
                        Console.WriteLine("Press any key to return to the main menu...");
                        Console.ReadLine();
                        Console.Clear();

从文本文件中进行计算

2 个答案: