将一组控件添加到列表

Question

我正在尝试将 3 个 TextBox 控件的值添加到列表中，问题是这些控件是通过单击按钮以编程方式添加的。我不知道如何将 3 个文本框组合在一起，以便将它们的值添加到列表中。

这里有一些代码：

按钮点击添加控件：

protected void Button_Add_Click(object sender, EventArgs e)
{
    int count = 0;
    if (ViewState["count"] != null)
    {
        count = (int)ViewState["count"];
    }
    count = PlaceHolder_ForEntries.Controls.Count + 1;
    ViewState["count"] = count;
    createcontrols();
}

添加控件的方法

protected void createcontrols()
{
    int count = 0;
    if (ViewState["count"] != null)
    {
        count = (int)ViewState["count"];
    }
    while (PlaceHolder_ForEntries.Controls.Count < count)
    {
        TextBox TextBox_Name = new TextBox();
        TextBox TextBox_MemberNo = new TextBox();
        TextBox TextBox_Points = new TextBox();
        TextBox_Name.Attributes.Add("placeholder", "Navn");
        TextBox_Name.ID = "TextBox_Name" + PlaceHolder_ForEntries.Controls.Count.ToString();
        TextBox_Name.CssClass = "input-small";
        TextBox_MemberNo.Attributes.Add("placeholder", "Medlemsnr.");
        TextBox_MemberNo.ID = "TextBox_MemberNo" + PlaceHolder_ForEntries.Controls.Count.ToString();
        TextBox_MemberNo.CssClass = "input-small";
        TextBox_Points.Attributes.Add("placeholder", "Point");
        TextBox_Points.ID = "TextBox_Points" + PlaceHolder_ForEntries.Controls.Count.ToString();
        TextBox_Points.CssClass = "input-small";
        PlaceHolder_ForEntries.Controls.Add(TextBox_Name);
        PlaceHolder_ForEntries.Controls.Add(TextBox_MemberNo);
        PlaceHolder_ForEntries.Controls.Add(TextBox_Points);
        PlaceHolder_ForEntries.Controls.Add(new LiteralControl("<br />"));
    }
}

最后运行的代码点击保存按钮，将项目添加到列表中：

public struct content
{
    public string name;
    public string memberNo;
    public int points;
}

List<content> rows = new List<content>();

protected void LinkButton_Submit_Attendees_Click(object sender, EventArgs e)
{
    foreach (Control item in PlaceHolder_ForEntries.Controls)
    {
        if (item is TextBox)
        {
            string txt = item.ID.ToString(); // String to run RegEx on
            string re1 = ".*?"; // Non-greedy match on filler
            string re2 = "(\\d+)";  // Integer Number 1

            Regex r = new Regex(re1 + re2, RegexOptions.IgnoreCase | RegexOptions.Singleline);
            Match m = r.Match(txt);

            int id = Convert.ToInt32(m.Groups[1].ToString());
            TextBox txtBox = (TextBox)item;

            content row = new content();
            if(item.ID.Contains(id.ToString()) && item.ID.Contains("Name"))
            {
                row.name = txtBox.Text;
            }
            else if (item.ID.Contains(id.ToString()) && item.ID.Contains("MemberNo"))
            {
                row.memberNo = txtBox.Text;
            }
            else if (item.ID.Contains(id.ToString()) && item.ID.Contains("Points"))
            {
                row.points = Convert.ToInt32(txtBox.Text);
            }
            rows.Add(row);
        }
    }
}

我需要的是，对于该迭代的每三个控件，rows.Add(row) 被调用，row.name, row.memberNo and row.points 都具有它们各自的值。

Answer 1

1. 你可以使用Linq的OfType在PlaceHolder中找到你所有的TextBoxes：

   var alltxt = PlaceHolder_ForEntries.Controls.OfType<TextBox>();
   

您可以为所有人使用 Linq：

List<content> rows = PlaceHolder_ForEntries.Controls.OfType<TextBox>()
    .Select(txt => new{
        Txt = txt,
        Number = new String(txt.ID.SkipWhile(c => !Char.IsDigit(c)).ToArray())
     })
    .GroupBy(x => x.Number)
    .Select(g => new content{ 
        name = g.First(x => x.Txt.ID.StartsWith("TextBox_Name")).Txt.Text,
        memberNo = g.First(x => x.Txt.ID.StartsWith("TextBox_MemberNo")).Txt.Text,
        points = int.Parse(g.First(x => x.Txt.ID.StartsWith("TextBox_Points")).Txt.Text)
    })
    .ToList();

我按您用于 ID (1-n) 的数字后缀进行分组。

Answer 2

我会更改您的 LinkBut​​ton_Submit_Attendees_Click 功能：

protected void LinkButton_Submit_Attendees_Click(object sender, EventArgs e)
{
        content row = new content();
foreach (Control item in PlaceHolder_ForEntries.Controls)
{
    if (item is TextBox)
    {
        string txt = item.ID.ToString(); // String to run RegEx on
        string re1 = ".*?"; // Non-greedy match on filler
        string re2 = "(\\d+)";  // Integer Number 1

        Regex r = new Regex(re1 + re2, RegexOptions.IgnoreCase | RegexOptions.Singleline);
        Match m = r.Match(txt);

        int id = Convert.ToInt32(m.Groups[1].ToString());
        TextBox txtBox = (TextBox)item;

        if(item.ID.Contains(id.ToString()) && item.ID.Contains("Name"))
        {
            row.name = txtBox.Text;
        }
        else if (item.ID.Contains(id.ToString()) && item.ID.Contains("MemberNo"))
        {
            row.memberNo = txtBox.Text;
        }
        else if (item.ID.Contains(id.ToString()) && item.ID.Contains("Points"))
        {
            row.points = Convert.ToInt32(txtBox.Text);
        }
if(!string.IsNullOrEmpty(row.name)
  && !string.IsNullOrEmpty(row.memberNo)
  && row.points > 0)){
        rows.Add(row);
        row = new content();
}
    }
}

}