限制基于Combobox的CheckBoxes

问题描述

下午好

我试图限制复选框的数量而不是可以勾选，取决于组合框值（组合中的1表示可以勾选1个框等） ）。我不知道该怎么做。请有人帮忙。

I am trying to limit the amount of checkboxes than can be ticked, depening ont he combobox value (1 in the combo means 1 box can be ticked etc). I am not sure how to go about it. Please can somebody help.

谢谢

  <CheckBox  Content="CB1" HorizontalAlignment="Left"  VerticalAlignment="Top" Height="18" Grid.Row="1" Width="53"  IsChecked="False"  Checked="CheckBoxChecked" Unchecked="CheckBoxUnchecked"/>
        <CheckBox Content="CB2" HorizontalAlignment="Left" VerticalAlignment="Top" Height="18" Grid.Row="1" Width="53" IsChecked="False" />
        <CheckBox Content="CB3" HorizontalAlignment="Left" VerticalAlignment="Top" Height="18" Grid.Row="1" Width="53" IsChecked="False" />
        <CheckBox Content="CB4" HorizontalAlignment="Left"  VerticalAlignment="Top" Height="18" Grid.Row="1" Width="53" IsChecked="False" />

 <Label x:Name="TotalofCheckBoxes" Content="Total" HorizontalAlignment="Left" VerticalAlignment="Top" Height="38" Width="99" FontSize="20" Grid.Row="1" />
        <ComboBox Name="Total" HorizontalAlignment="Left" Margin="549,181,0,0" VerticalAlignment="Top" Width="231" Height="40" FontSize="20" Background="#FF1E2A7F" OpacityMask="White" Foreground="Red"  Grid.Row="1">
            <ComboBoxItem Content="0"  />
            <ComboBoxItem Content="1" />
            <ComboBoxItem Content="2" />
            <ComboBoxItem Content="3" />
            <ComboBoxItem Content="4" />
            <ComboBoxItem Content="5" />
        </ComboBox>

$

推荐答案

 <Grid>
        <StackPanel>
            <CheckBox  Content="CB1"   HorizontalAlignment="Left"  VerticalAlignment="Top" Height="18" Grid.Row="1" Width="53"  IsChecked="False"   />
            <CheckBox Content="CB2" HorizontalAlignment="Left" VerticalAlignment="Top" Height="18" Grid.Row="1" Width="53" IsChecked="False" />
            <CheckBox Content="CB3" HorizontalAlignment="Left" VerticalAlignment="Top" Height="18" Grid.Row="1" Width="53" IsChecked="False" />
            <CheckBox Content="CB4" HorizontalAlignment="Left"  VerticalAlignment="Top" Height="18" Grid.Row="1" Width="53" IsChecked="False" />
            <Label x:Name="TotalofCheckBoxes" Content="Total" HorizontalAlignment="Left" VerticalAlignment="Top" Height="38" Width="99" FontSize="20" Grid.Row="1" />
            <ComboBox Name="Total" HorizontalAlignment="Left" VerticalAlignment="Top" Width="231" Height="40" FontSize="20" Background="#FF1E2A7F" OpacityMask="White" Foreground="Red"  Grid.Row="1" SelectionChanged="Total_SelectionChanged">
                <ComboBoxItem Content="0"  />
                <ComboBoxItem Content="1" />
                <ComboBoxItem Content="2" />
                <ComboBoxItem Content="3" />
                <ComboBoxItem Content="4" />
                <ComboBoxItem Content="5" />
            </ComboBox>
           
        </StackPanel>



    </Grid>

 private void Total_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            // string text = (e.AddedItems[0] as ComboBoxItem).Content as string;
            string text = ((sender as ComboBox).SelectedItem as ComboBoxItem).Content as string;
            if (text == null || text == "")
            {
                return;
            }
            int countcb = Convert.ToInt32(text);
            foreach (CheckBox cb in FindVisualChildren<CheckBox>(this))
            {
                cb.IsEnabled = true;
                cb.IsChecked = false;
            }
            foreach (CheckBox cb in FindVisualChildren<CheckBox>(this))
            {
                int indexi = Convert.ToInt32(cb.Content.ToString().Substring(2));
                if (indexi > countcb)
                {

                    cb.IsEnabled = false;
                    cb.IsChecked = false;

                }

            }
        }

        public static IEnumerable<T> FindVisualChildren<T>(DependencyObject depObj) where T : DependencyObject
        {
            if (depObj != null)
            {
                for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
                {
                    DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
                    if (child != null && child is T)
                    {
                        yield return (T)child;
                    }

                    foreach (T childOfChild in FindVisualChildren<T>(child))
                    {
                        yield return childOfChild;
                    }
                }
            }
        }

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