计算总销售额和平均销售额

Question

赋值如下：

Total Sales

Use the attached file named Sales.txt. Create an application that

reads the file’s content into an array of double or decimal

displays the array’s content in a ListBox control,

calculates the total of the array’s values, average sales, largest sales, smallest sales

Display the Total Sales, Average sales, Highest Sales and Smallest Sales

Form should look similar to the following:

如何通过输入相应的代码获取数据以显示图像的 Total/Average/High/Low 销售部分以正确显示？

我想自己做这个，所以如果你能提供一个可能与我正在做的事情相关的例子，那将非常有帮助。

这是我到目前为止能够输入的内容：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;

namespace Total_Sales
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void displayButton_Click(object sender, EventArgs e)
        {
            //declaring array
            const int SIZE = 100;
            decimal[] sales = new decimal[SIZE];

            //varible to hold amount stored in array
            int count = 0;

            decimal additionHolder = 0;

            //declaring streamreader
            StreamReader inputFile;

            //opening the sales file
            inputFile = File.OpenText("../../Sales.txt");

            try
            {
                //pull contents from file into array while there is still items
                //to pull and the array isnt full
                while (!inputFile.EndOfStream && count < sales.Length)
                {
                    sales[count] = decimal.Parse(inputFile.ReadLine());
                    count++;
                }
                //close the file
                inputFile.Close();

                //display contents in listbox
                for (int index = 0; index < count; index++)
                {
                    ListBox.Items.Add(sales[index]);
                }

                
                //add all the values
                for (int index = 0; index < sales.Length; index++)
                {
                    additionHolder += sales[index];
                }
                
                
            }

             
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.Close();
        }
    }
}

Answer 1

从文件中读取值后，只需使用 Linq 方法并设置您的 TextBox 控件的 Text 属性。

var total = sales.Sum();
var avg = sales.Average();
var min = sales.Min();
var max = sales.Max();

totalTextBox.Text = total.ToString(); //example for TextBox named totalTextBox

记得添加using :)

using System.Linq;

Answer 2

这里有两种解决方法。第一个使用 array，第二个使用 List。在这两个示例中，我假设总销售额、平均销售额、最小销售额和最大销售额的文本框称为 TotalSales、AverageSales、MinSales 和 MaxSales.

private void displayButton_Click(object sender, EventArgs e)
{
    const int SIZE = 100;
    decimal[] sales = new decimal[SIZE];

    int count = 0;
    decimal totalSales, averageSales, minSales, maxSales;

    StreamReader inputFile;
    inputFile = File.OpenText("../../Sales.txt");

    try
    {
        while (!inputFile.EndOfStream && count < sales.Length)
        {
            sales[count] = decimal.Parse(inputFile.ReadLine());
            minSales = count == 0 ? sales[count] : Math.Min(minSales, sales[count]);
            maxSales = count == 0 ? sales[count] : Math.Max(maxSales, sales[count]);
            totalSales += sales[count];
            ListBox.Items.Add(sales[count]);
            count++;
        }

        inputFile.Close();
        averageSales = totalSales / sales.Length;  

        TotalSales.Text = totalSales;
        AverageSales.Text = averageSale;
        MinSales.Text = minSales;
        MaxSales.Text = maxSales;
    }              
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

使用 List 和 Linq:

private void displayButton_Click(object sender, EventArgs e)
{
    List<decimal> sales = new List<decimal>(); // notice: no size limitation

    StreamReader inputFile;
    inputFile = File.OpenText("../../Sales.txt");

    try
    {
        while (!inputFile.EndOfStream)
        {
            var sale = decimal.Parse(inputFile.ReadLine()); 
            sales.Add(sale);
            ListBox.Items.Add(sale);
        }

        inputFile.Close();

        TotalSales.Text = sales.Sum();
        AverageSales.Text = sales.Average();
        MinSales.Text = sales.Min();
        MaxSales.Text = sales.Max();
    }              
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

如您所见，这段代码更加简洁。

顺便说一句，我手边没有 Visual Studio 就写了这段代码，所以它可能包含一些拼写错误。

计算总销售额和平均销售额

Calculate total and average sales

c#

arrays

variable-assignment