CODEWITHSUNDEEP
c#linq
Thomas
Thomas

Reputation: 34188

Checkbox validation with LINQ inside a group box windows form

i found it is possible to validate checkboxes is selected or not by linq.

i got the code like

btnAgree.Enabled = (from chkbox in Controls.OfType<CheckBox>() select chkbox).Count(b => b.Checked) >= 2;

but my scenario is like i have many check boxes on my win form but i want to check any check boxes inside my group box is selected by LINQ. is it possible but i found no way still. please help me with code.

i got a little code which is bit similar. the code as follows

public static IEnumerable<T> AllControls<T>(this Control startingPoint) where T : Control
{
 bool hit = startingPoint is T;
 if (hit)
 {
    yield return startingPoint as T;
 }
 foreach (var child in startingPoint.Controls.Cast<Control>())
 {
    foreach (var item in AllControls<T>(child))
    {
       yield return item;
    }
 }

}

 var checkboxes = control.AllControls<CheckBox>();
 var checkedBoxes = control.AllControls<CheckBox>().Where(c => c.Checked);

but how to customize this code that it will work with group box where my all check box is located. please guide. another issue is i am using c# v2.0. thanks

Upvotes: 1

Views: 1649

Answers (3)

Tim Schmelter
Tim Schmelter

Reputation: 460058

You don't need to use form's control collection, you can use your GroupBox' control collection instead:

btnAgree.Enabled = GroupBox1.Controls.OfType<CheckBox>()
                  .Where(chk => chk.Checked)
                  .Count() >= 2;

Upvotes: 4

Rapha&#235;l Althaus
Rapha&#235;l Althaus

Reputation: 60493

if you need recursion (imagine you have a panel in your GroupBox, and checkboxes have been added to panel), I think your extension method would still be usefull

changed a bit

public static IEnumerable<T> AllControls<T>(this Control startingPoint) where T : Control
        {
            if (startingPoint is T)
                yield return startingPoint as T;

            foreach (var item in startingPoint.Controls.Cast<Control>().SelectMany(AllControls<T>))
                yield return item;
        }

usage : 

var list = groupBox1.AllControls<CheckBox>();
var listChecked = list.Where(m => m.Checked);

Upvotes: 1

Ceramic Pot
Ceramic Pot

Reputation: 280

btnAgree.Enabled = 
    (from chkbox in groupBox1.Controls.OfType<CheckBox>()
     select chkbox).Count(b => b.Checked) >= 2;

You're checking the controls of the form.

Upvotes: 4

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