问题描述

我正在尝试创建一个程序来计算和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).我终于想出了如何将文本文件加载到列表框.我一直在寻找线索大约一个小时，我所有的尝试都把我带到了死胡同.

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，我的最高、最低和平均标签分别称为最高标签、最低标签和平均标签.我该如何着手创建这个程序.数字采用十进制格式.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，您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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