I have a CheckBoxList like this:
<asp:CheckBoxList ID="CBLGold" runat="server" CssClass="cbl">
<asp:ListItem Value="TGJU"> TG </asp:ListItem>
<asp:ListItem Value="GOLDOZ"> Gold </asp:ListItem>
<asp:ListItem Value="SILVEROZ"> Silver </asp:ListItem>
<asp:ListItem Value="NERKH"> NE </asp:ListItem>
<asp:ListItem Value="TALA"> Tala </asp:ListItem>
<asp:ListItem Value="YARAN"> Sekeh </asp:ListItem>
</asp:CheckBoxList>
Now I want to get the value of the selected items from this CheckBoxList using foreach, and put the values into a list.
Answers:
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Method 1
Note that I prefer the code to be short.
List<ListItem> selected = CBLGold.Items.Cast<ListItem>()
.Where(li => li.Selected)
.ToList();
or with a simple foreach:
List<ListItem> selected = new List<ListItem>();
foreach (ListItem item in CBLGold.Items)
if (item.Selected) selected.Add(item);
If you just want the ListItem.Value:
List<string> selectedValues = CBLGold.Items.Cast<ListItem>() .Where(li => li.Selected) .Select(li => li.Value) .ToList();
Method 2
foreach (ListItem item in CBLGold.Items)
{
if (item.Selected)
{
string selectedValue = item.Value;
}
}
Method 3
Good afternoon, you could always use a little LINQ to get the selected list items and then do what you want with the results:
var selected = CBLGold.Items.Cast<ListItem>().Where(x => x.Selected); // work with selected...
Method 4
Following suit from the suggestions here, I added an extension method to return a list of the selected items using LINQ for any type that Inherits from System.Web.UI.WebControls.ListControl.
Every ListControl object has an Items property of type ListItemCollection. ListItemCollection exposes a collection of ListItems, each of which have a Selected property.
C Sharp:
public static IEnumerable<ListItem> GetSelectedItems(this ListControl checkBoxList)
{
return from ListItem li in checkBoxList.Items where li.Selected select li;
}
Visual Basic:
<Extension()> _
Public Function GetSelectedItems(ByVal checkBoxList As ListControl) As IEnumerable(Of ListItem)
Return From li As ListItem In checkBoxList.Items Where li.Selected
End Function
Then, just use like this in either language:
myCheckBoxList.GetSelectedItems()
Method 5
List<string> values =new list<string>();
foreach(ListItem Item in ChkList.Item)
{
if(Item.Selected)
values.Add(item.Value);
}
Method 6
To top up on @Tim Schmelter, in which to get back the List<int> instead,
List<string> selectedValues = CBLGold.Items.Cast<ListItem>() .Where(li => li.Selected) .Select(li => li.Value) .Select(int.Parse) .ToList();
Method 7
If you have a databound checklistbox it does not work to get item(j).Selected, because the control does not have a selected attribute. If you clearSelections i.e. on Load, then apparently it now understands item(j).selected.
Method 8
Just in case you want to store the selected values in single column seperated by , then you can use below approach
string selectedItems = String.Join(",", CBLGold.Items.OfType<ListItem>().Where(r => r.Selected).Select(r => r.Value));
if you want to store Text not values then
Change the r.Value to r.Text
Method 9
string s= string.Empty
for (int i = 0; i < Chkboxlist.Items.Count; i++)
{
if (Chkboxlist.Items[i].Selected)
{
s+= Chkboxlist.Items[i].Value + ";";
}
}
Method 10
In my codebehind i created a checkboxlist from sql db in my Page_Load event and in my button_click event did all the get values from checkboxlist etc.
So when i checked some checkboxes and then clicked my button the first thing that happend was that my page_load event recreated the checkboxlist thus not having any boxes checked when it ran my get checkbox values…
I’ve missed to add in the page_load event the if (!this.IsPostBack)
protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
// db query and create checkboxlist and other
SqlConnection dbConn = new SqlConnection(WebConfigurationManager.ConnectionStrings["ConnString"].ConnectionString);
string query;
try
{
query = "SELECT [name], [mail] FROM [users]";
dbConn.Open();
SqlDataAdapter da = new SqlDataAdapter(query, dbConn);
DataSet ds = new DataSet();
da.Fill(ds);
if (ds.Tables[0].Rows.Count != 0)
{
checkboxlist1.DataSource = ds;
checkboxlist1.DataTextField = "name";
checkboxlist1.DataValueField = "mail";
checkboxlist1.DataBind();
}
else
{
Response.Write("No Results found");
}
}
catch (Exception ex)
{
Response.Write("<br>" + ex);
}
finally
{
dbConn.Close();
}
}
}
protected void btnSend_Click(object sender, EventArgs e)
{
string strChkBox = string.Empty;
foreach (ListItem li in checkboxlist1.Value)
{
if (li.Selected == true)
{
strChkBox += li.Value + "; ";
// use only strChkBox += li + ", "; if you want the name of each checkbox checked rather then it's value.
}
}
Response.Write(strChkBox);
}
And the output was as expected, a semicolon separeted list for me to use in a mailsend function:
<a href="https://getridbug.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="c7a5aeabab87a4a8a9b3a8b4a8e9a4a8aa">[email protected]</a>; <a href="https://getridbug.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="3e545b58587e5d514c4e1057505d">[email protected]</a>; <a href="https://getridbug.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="97e4f6fad7f3f8e3b9f9f2e3">[email protected]</a>
A long answer to a small problem. Please note that i’m far from an expert at this and know that there are better solutions then this but it might help out for some.
Method 11
I like to use this simple method to get the selected values and join them into a string
private string JoinCBLSelectedValues(CheckBoxList cbl, string separator = "")
{
return string.Join(separator, cbl.Items.Cast<ListItem>().Where(li => li.Selected).ToList());
}
All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0