CODEWITHSUNDEEP
c#.netwpf
Abhishek
Abhishek

Reputation: 329

i have a listbox and check box and how can i find the how much check box checked in wpf

I want to find how much check box is checked by code :

 <Grid Width="440" >

<ListBox Name="listBoxZone" ItemsSource="{Binding TheList}"  Background="White" Margin="0,120,2,131">  
      <ListBox.ItemTemplate>
            <HierarchicalDataTemplate>
  <CheckBox Name="CheckBoxZone" Content="{Binding StatusName}" Tag="{Binding StatusId}" Margin="0,5,0,0" VerticalAlignment ="Top"   />
             </HierarchicalDataTemplate>
      </ListBox.ItemTemplate>
</ListBox>

      </Grid>

Here is my code where i want to find how much check box is checked ?

for (int i = 0; i < listBoxZone.Items.Count; i++)
                    {
                        if (CheckBoxZone.IsChecked == true )
                        { 


                        }

                    }

Upvotes: 0

Views: 726

Answers (2)

Nikhil Agrawal
Nikhil Agrawal

Reputation: 48558

Use OfType Method of LINQ

int result = 
            listBoxZone.Items.OfType<CheckBox>().Count(i => i.IsChecked == true);

I used OfType instead of Cast because OfType will work even if there a single checkbox item or all items are checkboxes.

In case of Cast it will give error if even a single item is not checkbox.

Upvotes: 0

Clemens
Clemens

Reputation: 128061

You could add an IsChecked property of type Nullable<bool> (could be written as bool?) to your data item class and two-way bind the CheckBox.IsChecked property:

<CheckBox Name="CheckBoxZone" IsChecked={Binding IsChecked, Mode=TwoWay} ... />

Now you can simple iterate over all items and check their IsChecked state:

int numChecked = 0;
foreach (MyItem item in listBoxZone.Items)
{
    if ((bool)item.IsChecked) // cast Nullable<bool> to bool
    {
        numChecked++;
    }
}

or with Linq:

int numChecked =
    itemsControl.Items.Cast<MyItem>().Count(i => (bool)i.IsChecked);

And just a note: why do you use HierarchicalDataTemplate in a ListBox, where DataTemplate would be sufficient?

Upvotes: 3

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