Question

我在ListForm中有一个C# 问题是，当用户点击列表中的某个学生时，我希望它能够找到平均值，分数和总和代码如下：

private void listForm1_SelectedIndexChanged(object sender, EventArgs e)
{
    txtTotal.Text = listForm1.SelectedItem.ToString();
}


private void Form1_Load(object sender, EventArgs e)
{
    listForm1.Items.Add("Hamish overtonne" + "|" + 39 + "|" + 12 + "|" + 85);
    listForm1.Items.Add("Claudia Dye" + "|" + 44 + "|" + 56 + "|" + 85);
    listForm1.Items.Add("Mike Layne" + "|" + 12 + "|" + 47+ "|" + 28);
}

这就是我现在所拥有的全部

Answer 1

这是您可以用来执行此操作的代码。请记住将SelectedIndexChanged事件注册到您的列表中。

还要记住，像我一样使用整数将创建整数，不带小数点。

我已经添加了代码注释来解释这个过程：

private void listForm1_SelectedIndexChanged(object sender, EventArgs e)
{
    // Get the value from the selected item
    string val = listForm1.GetItemText(listForm1.SelectedItem);

    // Split the item's value to a string array according to the pipe char
    string[] valArray = val.Split('|');

    int sum = 0;
    int scores = 0;

    // Iterate through all possible values and sum it up, 
    // while keeping count to how many numbers there are:
    for (int i = 1; i < valArray.Length; i++)
    {
          int num = Convert.ToInt32(valArray[i]);
          sum += num;
          scores++;
    }

    // Calculate the  average. 
    // Keep in mind using an integer will create a whole number, without decimal points.        
    int average = sum / scores;

    // Place the average and the sum in textboxes
    txtAverage.Text = average.ToString();
    txtTotal.Text = sum.ToString();
    txtCount.Text = scores.ToString();
}

Answer 2

尝试以下代码：

private void listForm1_SelectedIndexChanged(object sender, EventArgs e)
{
    // Get the value from the selected item
    string val = listForm1.GetItemText(listForm1.SelectedItem);

    // Split the item's value to a string array according to the pipe char
    string[] valArray = val.Split('|');

    int sum = 0;
    int scores = 0;
    int value=0;
    // Iterate through all possible values and sum it up, 
    // while keeping count to how many numbers there are:
    for (int i = 1; i < valArray.Length; i++)
    {
int.TryParse(valArray[i], out value);
if(value>0){
          int num = value;
          sum += num;
          scores++;
}
    }

    // Calculate the  average. 
    // Keep in mind using an integer will create a whole number, without decimal points.        
    int average = sum / scores;

    // Place the average and the sum in textboxes
    txtAverage.Text = average.ToString();
    txtTotal.Text = sum.ToString();
    txtCount.Text = scores.ToString();
}

如何查找所选listForm C＃中所有数字的总和

2 个答案: