c# - 如何将选定复选框中的信息后面的逗号放入文本框？

Question

       foreach (GridViewRow row in GridView1.Rows)         
       {           
        var chk = row.FindControl("myCheckBox") as CheckBox;
        if (chk.Checked)
        {
        var email = row.FindControl("LabelEmail") as Label;
        txtEmails.Text += (string.Join(",", email.Text));
        }

我正在从 GridView 中提取电子邮件，并假设相应地放置电子邮件，并用逗号分隔它们。我尝试使用 string.join 方法，但它根本没有出现在文本框中。我尝试不使用 string.join 但逗号将添加到每封电子邮件旁边。如何正确分隔电子邮件？

示例:[email protected] , [email protected] , [email protected]

Answer 1

而不是:

txtEmails.Text += (string.Join(",", email.Text));

试试这个:

txtEmails.Text += email.Text + ", ";

编辑:

因为它会在最后一封电子邮件中添加逗号，所以您可以执行以下操作来防止这种情况:

int counter = 0;
// The counter variable must be global
foreach (GridViewRow row in GridView1.Rows)         
{           
    var chk = row.FindControl("myCheckBox") as CheckBox;
    if (chk.Checked)
    {
        counter++;
        var email = row.FindControl("LabelEmail") as Label;
        if (counter <= 1)
        txtEmails.Text += email.Text;
        else
        txtEmails.Text += ", " + email.Text;
    }
}

希望这有帮助!