从文本文件C#计算平均值 [英] Calculate Average from a Textfile C#

问题描述

private void button1_Click(object sender, EventArgs e)
{
    try
    {
        var WriteToFile = new System.IO.StreamWriter("student.txt"); //create textfile in default directory
        WriteToFile.Write(txtStudNum.Text + ", " + txtStudName.Text + ", " + txtModCode.Text + ", " + txtModMark.Text);
        WriteToFile.Close();
        this.Close(); 
    }

    catch (System.IO.DirectoryNotFoundException ex)
    {
        //add error message
    }
}

private void button3_Click(object sender, EventArgs e)
{
    File.AppendAllText("student.txt", "\r\n" + txtStudNum.Text + ", " +  
    txtStudName.Text + ", " + txtModCode.Text + ", " + txtModMark.Text);
}

private void button4_Click(object sender, EventArgs e)
{

}

输入所有值后，我想从文本文件计算txtModMark的平均值.它将进入按钮4下方，因此当我单击它时，它将进行计算.我需要知道如何跳过每行的前几列并转到最后一列以执行平均计算.

I want to calculate the average for txtModMark from the textfile once all the values have been entered. It will go under button 4 so when I click it, it calculates. I need to know how to skip the first few columns per row and get to the last column to perform the average calculation.

推荐答案

从文件中读取然后解析它，然后转换为INT，然后在可以直接使用s List<int>进行计算时计算平均值，这有什么意义?下方:

What's the point in reading from file then parse it and then convert to INT and then calculate average when you can do it directly using s List<int> like below:

在您的Form

List<int> marks = new List<int>();

将标记存储在按钮单击事件中

Store the marks in button click event

  private void button1_Click(object sender, EventArgs e)
    {
        try
        {
            var WriteToFile = new System.IO.StreamWriter("student.txt"); //create textfile in default directory
            WriteToFile.Write(txtStudNum.Text + ", " + txtStudName.Text + ", " + txtModCode.Text + ", " + txtModMark.Text);
            WriteToFile.Close();
           marks.Add(Convert.ToInt32(txtModMark.Text)); //add to list
        }

        catch (System.IO.DirectoryNotFoundException ex)
        {
            //add error message
        }
    }

在button4点击事件中计算平均值

In button4 click event calculate the average

private void button4_Click(object sender, EventArgs e)
{
   int totalmarks = 0;
   foreach(int m in marks)
    totalmarks += m;

  MessageBox.Show("Average Is: " + totalmarks / marks.Count);
}

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