如何获取在按钮单击事件中动态创建的选中复选框值

Question

i am having checkboxes which are created dynamically in page_load event and put it in panel.

foreach (DataRow dr in column_ds.Rows)
        {
            column_checkbox = new CheckBox();
            column_checkbox.Text = (string)dr["COLUMN_NAME"];
            columnpanel1.Controls.Add(column_checkbox);
        }

now i want the checked check box values in btn_click event. any ideas? i tried,

columnpanel1.FindControl("column_checkbox");

and

  CheckBox cb=(CheckBox)FindControl("column_checkbox");
        if (column_checkbox.Checked) { }
        {
            string name = column_checkbox.Text;
        }

Answer 1

On click event of button, you can implement below logic.

protected void btn_click(object sender, EventArgs e)
{
   foreach(var row in columnpanel1.Rows)
   {
       var tempchkBx= row.Controls[0] as CheckBox;
       if(tempchkBx.IsChecked)
       {
         //write your code
       }
   }
}

Answer 2

You should do this

foreach (DataRow dr in column_ds.Rows)
        {
            column_checkbox = new CheckBox();
            column_checkbox.Text = (string)dr["COLUMN_NAME"];
            column_checkbox.ID = (string)dr["ID"]
            columnpanel1.Controls.Add(column_checkbox);
        }

Than you can find control using ID.

Answer 3

Thank you for all your comments and answers.

Finally i got by,

foreach (Control cb in columnpanel1.Controls)
        {
            if (cb is CheckBox)
            {
                CheckBox c = (CheckBox)cb;
                if (c.Checked)
                {
                    string s = c.Text;
                }
            }
        }

Answer 4

You can also do this in LINQ:

var boxes = columnpanel1.Controls.OfType<CheckBox>().Where(c=>c.Checked).ToList();

 foreach(var chk in boxes )
        {
          string s = chk.Text;
        }

Answer 5

In case for that to work you need to add an event handler to dynamically added controls in your case

checkbox = new CheckBox();
phChecklist.Controls.Add(checkbox);
checkbox.CheckedChanged += checkBox_CheckedChanged;

and then what you need to do in the method

private void CheckBox_CheckedChanged(object sender, System.EventArgs e)
{
  ...
}