如何在列表框中查找最低，最高和平均值 [英] How to find the lowest, highest and average values in a listbox

问题描述

我正在尝试创建一个程序，该程序计算并显示列表框中项目的最高，最低和平均值(从txt文件生成的项目).我终于弄清楚了如何将文本文件加载到列表框中.我一直在寻找线索一个小时，所有的尝试都使我陷入僵局.

I'm trying to create a program that calculates and displays the highest, lowest and average value of items in a listbox (items generated from a txt file). I finally figured out how to load a text file to the listbox. I have been searching for clues for about an hour and all my attempts have brought me to a dead end.

我的列表框称为readListbox，而我的最高，最低和平均标签分别称为highestLabel，lowestLabel和averageLabel.我该如何创建该程序.数字为十进制格式.任何帮助将不胜感激.

my listbox is called readListbox and my Highest, Lowest and Average labels are called highestLabel, lowestLabel and averageLabel respectively. How do I go about creting this program. The numbers are in the decimal format. Any Help will be very much appreciated.

private void readButton_Click(object sender, EventArgs e)
{
    try
    {
        OpenFileDialog Open = new OpenFileDialog();
        if(Open.ShowDialog() == DialogResult.OK)
        {
            readListbox.Text = Open.FileName;
            string[] lines = System.IO.File.ReadAllLines(Open.FileName);
            readListbox.Items.AddRange(lines);
        }
    }
    catch
    {
        MessageBox.Show("Error");
    }

    }
}
}

推荐答案

读取文件的字符串元素后，需要将它们转换为十进制值.此时，您可以使用IEnumerable扩展的内置方法来获取数据

After reading the string elements of your file you need to convert them to decimal values. At that point you can use the built in methods of the IEnumerable extensions to get your data

OpenFileDialog Open = new OpenFileDialog();
if(Open.ShowDialog() == DialogResult.OK)
{
        readListbox.Text = Open.FileName;
        string[] lines = System.IO.File.ReadAllLines(Open.FileName);

        decimal[] values = lines.Select(x => decimal.Parse(x)).ToArray();
        labelHigh.Text = values.Max().ToString();
        labelMin.Text = values.Min().ToString();
        labelAvg.Text = values.Average().ToString();        

        readListbox.Items.AddRange(lines);
 }

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