Question

在我的学生注册表中，我在主表单中有一个列表框，在我的第二个表单中我添加了学生。在第二种形式中，我在名称文本框中添加一个名称，并为学生添加需要用竖线字符（“|”）分隔的数字。在用户按下okay按钮后填写文本框中的名称和数字后，它应该看起来像下面的硬编码学生。代码

第一表格

private void listForm1_SelectedIndexChanged(object sender, EventArgs e)
        {


            string val = listForm1.GetItemText(listForm1.SelectedItem);



            string[] valArray = val.Split('|');

            int sum = 0;
            int scores = 0;


            for (int i = 1; i < valArray.Length; i++)
            {
                int num = Convert.ToInt32(valArray[i]);
                sum += num;
                scores++;
            }


            int average = sum / scores;


            txtAverage.Text = average.ToString();
            txtTotal.Text = sum.ToString();
            txtScoreCount.Text = scores.ToString();
        }


        private void Form1_Load(object sender, EventArgs e)

        {

            listForm1.Items.Add("Hamish Overtone" + "|" + 39 + "|" + 12 + "|" + 85);
            listForm1.Items.Add("Claudia Dye" + "|" + 44 + "|" + 56 + "|" + 85);
            listForm1.Items.Add("Mike Layne" + "|" + 12 + "|" + 47+ "|" + 28);

        }

第二表格

 private void btnADDSCORE_Click(object sender, EventArgs e)
        {


            string userInput = txtNewScore.Text;

            txtNewScores.Text = txtNewScores.Text + " " + userInput;

            txtNewScore.Text = String.Empty;


        }
           private void btnNewOk_Click(object sender, EventArgs e)
        {

        }

        private void txtNewName_TextChanged(object sender, EventArgs e)
        {

        }
    }
ERRORING PART:

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();
    txtScoreCount.Text = scores.ToString();
}

Answer 1

在主窗口（此处为Form1）中，您需要创建一个委托，允许您传递数据，例如字符串。然后，您创建该委托类型的实例并订阅匹配的方法。然后，当您打开辅助窗口时，将该委托传递给辅助窗口。

public delegate void DataTransfer(string data);

public partial class Form1 : Form
{
    public DataTransfer transferDelegate;

    public Form1()
    {
        InitializeComponent();
        transferDelegate += new DataTransfer(DataMethod);
    }

    public void DataMethod(string data)
    {
        // Do what you want with your data.
        MessageBox.Show(data);
    }

    private void button1_Click(object sender, EventArgs e)
    {
        InputWindow win = new InputWindow(transferDelegate);
        win.Show();
    }
}

现在，当您在辅助窗口中调用该委托时，将调用Form1的DataMethod()，因此您可以在窗口之间传递信息。

您的辅助窗口实现应如下所示：

public partial class InputWindow : Form
{
    DataTransfer transferDel;

    public InputWindow(DataTransfer del)
    {
        InitializeComponent();
        transferDel = del;
    }

    private void button1_Click(object sender, EventArgs e)
    {
        string data = textBox1.Text;
        transferDel.Invoke(data);
    }
}

如您所见，当您调用传递的委托时，它会调用主程序中Form1的相应方法。

Answer 2

尝试添加按钮并使用以下代码（在form1类中）到其click事件处理程序。

class form1
{
    private void form1_addButton_Click(object sender, EventArgs e)
    {
         Form2 newForm = new Form2();
         newForm.ShowDialog();

         foreach(string s in newForm.studentInfo)
         {
             listForm1.Items.Add(s);
         }
    } 
}

以下代码将添加到您的form2类文件中。

class form2
{
    public List<string> studentInfo {get; set;} //add this to form2 

    private void form2_addButton_Click(object sender, EventArgs e)
    {


        //add scores to list here.

    }

}

修改

//THIS IS IN FORM2 :)
private void btnNewOk_Click(object sender, EventArgs e)
{
    string student = textBoxName.Text;
    string[] scores = textBoxNewScores.Text.Trim().Split(' '); 

    for(int i = 0; i < scores.Length; i++)
    {
        student = student + "|" + scores[i];
    }
    studentInfo.Add(student);
    this.Close();
}

修改2

private void listForm1_SelectedIndexChanged(object sender, EventArgs e)
{


    string val = listForm1.GetItemText(listForm1.SelectedItem);



    string[] valArray = val.Split('|');

    int sum = 0;
    int scores = 0;


    for (int i = 1; i < valArray.Length; i++)
    {
        int num = Convert.ToInt32(valArray[i]);
        sum += num;
        scores++;
    }


    int average = 0;

    if (scores != 0)
        average = sum / scores;


    txtAverage.Text = average.ToString();
    txtTotal.Text = sum.ToString();
    txtScoreCount.Text = scores.ToString();
}

如何将文本框中的信息转换为另一种形式的列表框

2 个答案: