bind checkbox to a field having Y N

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Dear All,
I have a field in datacontext as
nvarchar(1)
the values for this field are 'Y' or 'N'

I want to bind this field to a checkbox in wpf

I have accomplished this task using events but I need to make this on Binding to acheive standard coding style

Can You please help me binding a character field to a checkbox.

I know boolean can be easily bounded but what about character field.
'Y' for checked
'N' For unchecked.

Hope I am making sense.

Looking forward to know from you for the help.

Regards

Posted 23-Mar-13 8:54am

J imran

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[no name] 23-Mar-13 15:02pm

I think you are going to want to bind to a value converter.

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Maciej Los · Answer 1 · 2013-03-24T01:58:00

Create custom CheckBox class with overloaded Checked property.

Example for VB.NET:
Custom class definition

VB

Public Class MyCheckBox
    Inherits CheckBox

    Public Overloads Property Checked() As String
        Get
            Return BooleanToString(MyBase.Checked)
        End Get
        Set(ByVal value As String)
            MyBase.Checked = StringToBoolean(value)
        End Set
    End Property

    Private Function BooleanToString(ByVal b As Boolean) As String
        Return IIf(b, "Y", "N")
    End Function

    Private Function StringToBoolean(ByVal s As String) As Boolean
        Return IIf("Y", True, False)
    End Function


End Class

Usage

VB

    Dim mch As MyCheckBox = New MyCheckBox
    With mch
        .Location = New Point(8, 8)
        .Parent = Me 'this (form)
        .Text = "Check it"
        'add custom event handler
        AddHandler mch.CheckedChanged, AddressOf mcb_CheckedChanged
    End With


Private Sub mcb_CheckedChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles mcb.CheckedChanged
    Dim oc As MyCheckBox = sender
    Me.Text = oc.Checked.ToString
End Sub

I hope that above code can works for WPF too.

Lance Contreras · Answer 2 · 2013-03-26T04:19:00

Hi,

You can do this by using a converter. Just like a BoolToVisibilityConverter, you can create a YesNoToBoolConverter. Here's how I would do it:

Here's the converter:

C#

public class YesNoToBooleanConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (value.ToString() == "Y")
                return true;
            else
                return false;
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (value is bool)
            {
                if ((bool)value == true)
                    return "Y";
                else
                    return "N";
            }
            return null;
        }
    }

And here's the VM:

C#

public class MainVM: ViewModelBase
 {
     string isChecked;
     public string IsChecked
     {
         get
         {
             return isChecked;
         }
         set
         {
             isChecked = value;
             base.RaisePropertyChanged("IsChecked");
         }
     }
 }

And here's the view:

<window x:class="WpfApplication9.MainWindow" xmlns:x="#unknown">
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:WpfApplication9"
        Title="MainWindow" Height="350" Width="525">
    <stackpanel>
        <stackpanel.resources>
            <local:yesnotobooleanconverter x:key="YesNoConverter" xmlns:local="#unknown" />
        </stackpanel.resources>
        <checkbox ischecked="{Binding IsChecked, Converter={StaticResource YesNoConverter}}" />
    </stackpanel>
</window>

C#

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        this.DataContext = new MainVM() { IsChecked = "N" } ;

    }
}

Basically, the converter intercepts the actual value that was bound to your attribute and return something that is friendly to that attribute or to the view.

Here's a good tutorial about value converter:
http://wpftutorial.net/ValueConverters.html

Hope this helps :)

bind checkbox to a field having Y N

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