how could i collect all the radio button that chosen in submit button? - asp.net

Question

Here is my Code:
public partial class Play : System.Web.UI.UserControl
{
int surveyId = 153;
protected void Page_Load(object sender, EventArgs e)
{
// surveyId = int.Parse(Request[SurveyContext.SurveyID]);
FillQuestion();
}
void FillQuestion()
{
IList<Eskadenia.Framework.Survey.Entitis.Question> QuestionLst = Eskadenia.Framework.Survey.Data.QuestionManager.GetQuestionBySurveyId(surveyId);
try
{
RepPlay.DataSource = QuestionLst;
RepPlay.DataBind();
}
catch (Exception ex)
{
Response.Write(ex.InnerException);
}
}
protected void RepPlay_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
RadioButtonList rblAnswers = ((RadioButtonList)e.Item.FindControl("rblAnswers"));
IList<Eskadenia.Framework.Survey.Entitis.Answer> answerlst;
answerlst = Eskadenia.Framework.Survey.Data.AnswerManager.GetAnswerByQuestionID(((Eskadenia.Framework.Survey.Entitis.Question)(e.Item.DataItem)).ID);
for (int i = 0; i < answerlst.Count; i++)
{
rblAnswers.Items.Add(new ListItem(answerlst[i].Name, answerlst[i].ID.ToString()));
}
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
Response.Redirect("~/Surveys.aspx");
}
}

Answer 1

First: you should databind the repeater only if(!IsPostBack):
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
FillQuestion();
}
Otherwise all changes are lost and events aren't triggered.
According to the core issue how to get all selected ListItems in the repeater, is this helpful:
var allSelectedItems = RepPlay.Items.Cast<RepeaterItem>()
.Select(ri => new{
ItemIndex = ri.ItemIndex,
SelectedItem = ((RadioButtonList) ri.FindControl("rblAnswers"))
.Items.Cast<ListItem>()
.First(li => li.Selected)
});
This presumes that you want the ItemIndex as identifier, if you need the ID you have to tell us where it's stored. You could also use ri.FindControl("HiddenIDControl") to get it.
Since you have commented that you want a dictionary, you could use this query:
Dictionary<int, string> questionAnswers = RepPlay.Items.Cast<RepeaterItem>()
.ToDictionary(ri => ri.ItemIndex, ri => ((RadioButtonList)ri.FindControl("rblAnswers"))
.Items.Cast<ListItem>()
.First(li => li.Selected).Value);
Here is the same without LINQ, you're right, in this case the loop is even simpler:
Dictionary<int, string> questionAnswers = new Dictionary<int, string>();
foreach (RepeaterItem item in RepPlay.Items)
{
string selectedValue = ((RadioButtonList)item.FindControl("rblAnswers")).SelectedValue;
questionAnswers.Add(item.ItemIndex, selectedValue);
}
I have noticed that my LINQ approaches were too complicated anyway, you can always use RadioButtonList.SelectedValue since a RadioButtonList doesn't support multi-selection.