CODEWITHSUNDEEP
c#asp.netfor-loopforeachcontrols
Joe Stellato
Joe Stellato

Reputation: 568

Find All Radio Buttons in ASP Table

I have an ASP table which contains a large number of radio buttons. I want to loop through them all quickly and set the checked property to false:

   <asp:Table runat=Server ID=tblSchedule>
            <asp:TableRow>
                <asp:TableCell>
    <asp:RadioButton runat=Server ID=rdb1/>
</asp:TableCell>
</asp:TableRow>
</asp:table>

The following code never returns any results though.

foreach (RadioButton rdb in tblSchedule.Controls.OfType<RadioButton>())
{
    rdb.Checked = false;
}

Upvotes: 2

Views: 3634

Answers (2)

Karl Anderson
Karl Anderson

Reputation: 34846

You need to loop through the layers of the table control, like this:

foreach (var tr in tblSchedule.Controls.OfType<TableRow>())
{
    foreach (var td in tr.Controls.OfType<TableCell>())
    {
        foreach (var rdb in td.Controls.OfType<RadioButton>())
        {
            rdb.Checked = false;
        }
    }
}

Or alternatively you can use LINQ, like this:

foreach (var rdb in tblSchedule.Controls.OfType<TableRow>()
    .SelectMany(tr => tr.Controls.OfType<TableCell>()
    .SelectMany(td => td.Controls.OfType<RadioButton>())))
{
    rdb.Checked = false;
}

Upvotes: 1

Tim Schmelter
Tim Schmelter

Reputation: 460118

As far as i remember the table's control cllection does not contain all controls in all rows' cells. Controls.OfType does not search recursively in child controls. So you either have to use a recursive method or just use the Rows property and this linq query:

IEnumerale<RadioButton> allRadios = this.tblSchedule.Rows.Cast<TableRow>()
     .SelectMany(r => r.Cells.Cast<TableCell>()
                       .SelectMany(c => c.Controls.OfType<RadioButton>()));

foreach(RadioButton rBtn in allRadios)
    rBtn.Checked = false;

Upvotes: 0

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