Question

在列表框中选择项目后，需要更新带有小数的3个文本框。

指向文件的链接：https://www.dropbox.com/s/xj2efe5sxsolswk/midterm.zip

列表框中的格式：“名称| XX | | XX | | XX |”例如“马特| 100 | | 90 | | 80 |”

如何从列表框中调出与所选索引关联的3个值，以计算3个值并更新与该列表框选择关联的3个文本框？

我创建了3个列表来尝试存储我需要的内容。我将得分输入保存到scoreList2，但在将它与ListBox关联时不确定如何链接它们。

    public static List<string> scoreList = new List<string>();
    public static List<decimal> scoreList2 = new List<decimal>();
    public static List<object> scoreList3 = new List<object>();

代码：

    private void Form1_Load(object sender, EventArgs e)
    {
        (all hard coded cuz I'm a noob)
        //txtScoreTotal.Text = tempNum1.ToString();
        //txtScoreTotal.text = 
        //txtScoreCount.Text = tempNum2.ToString();
        //txtAverage.Text = tempNum3.ToString();

        lbStudents.Items.Add(tempInfo1 + " " + tempNum1 + " " + tempNum2 + " " + tempNum3);

    }

    private void lbStudents_SelectedIndexChanged(object sender, EventArgs e)
    {
        /*
        txtScoreTotal.Text = tempNum1.ToString();
        //txtScoreTotal.Text = selected listbox scoretotal
        txtScoreCount.Text = tempNum2.ToString();
        //txtScoreTotal.Text = selected listbox scorecount
        txtAverage.Text = tempNum3.ToString();
        //txtSCoreTotal.Text = selected listbox average
         */

        txtScoreTotal.Text = lbStudents.SelectedItem.ToString();

    }

Answer 1

您可以使用String.Split方法和LINQ这样：

private void lbStudents_SelectedIndexChanged(object sender, EventArgs e)
{
   if(lbStudents.SelectedItem != null)
   {
       decimal result;
       var numbers = lbStudents.SelectedItem.ToString()
       .Split(new [] { '|' }, StringSplitOptions.RemoveEmptyEntries)
       .Where(x => decimal.TryParse(x, out result))
       .ToList();

       txtBox1.Text = numbers[0];
       txtBox2.Text = numbers[1];
       txtBox3.Text = numbers[2];
   }

}

列表框选择更新文本框

1 个答案: